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## com.trolltech.qt.network
Class QFtp

    java.lang.Object
      com.trolltech.qt.internal.QSignalEmitterInternal
          com.trolltech.qt.QSignalEmitter
              com.trolltech.qt.QtJambiObject
                  com.trolltech.qt.core.QObject
                      com.trolltech.qt.network.QFtp

All Implemented Interfaces:
  QtJambiInterface

    public class QFtp

extends QObject

The QFtp class provides an implementation of the client side of FTP protocol. This class provides a direct interface to FTP that allows you to have more control over the requests. However, for new applications, it is recommended to use `QNetworkAccessManager` and `QNetworkReply`, as those classes possess a simpler, yet more powerful API.

The class works asynchronously, so there are no blocking functions. If an operation cannot be executed immediately, the function will still return straight away and the operation will be scheduled for later execution. The results of scheduled operations are reported via signals. This approach depends on the event loop being in operation.

The operations that can be scheduled (they are called "commands" in the rest of the documentation) are the following: `connectToHost()`, `login()`, `close()`, `list()`, `cd()`, `get()`, `put()`, `remove()`, `mkdir()`, `rmdir()`, `rename()` and `rawCommand()`.

All of these commands return a unique identifier that allows you to keep track of the command that is currently being executed. When the execution of a command starts, the `commandStarted()` signal with the command's identifier is emitted. When the command is finished, the `commandFinished()` signal is emitted with the command's identifier and a bool that indicates whether the command finished with an error.

In some cases, you might want to execute a sequence of commands, e.g. if you want to connect and login to a FTP server. This is simply achieved:

        QFtp ftp = new QFtp(parent);
        ftp.connectToHost("ftp.trolltech.com");
        ftp.login();

In this case two FTP commands have been scheduled. When the last scheduled command has finished, a `done()` signal is emitted with a bool argument that tells you whether the sequence finished with an error.

If an error occurs during the execution of one of the commands in a sequence of commands, all the pending commands (i.e. scheduled, but not yet executed commands) are cleared and no signals are emitted for them.

Some commands, e.g. `list()`, emit additional signals to report their results.

Example: If you want to download the INSTALL file from Trolltech's FTP server, you would write this:

        ftp.connectToHost("ftp.trolltech.com");  // id == 1
        ftp.login();                             // id == 2
        ftp.cd("qt");                            // id == 3
        ftp.get("INSTALL");                      // id == 4
        ftp.close();                             // id == 5

For this example the following sequence of signals is emitted (with small variations, depending on network traffic, etc.):

        start(1)
        stateChanged(HostLookup)
        stateChanged(Connecting)
        stateChanged(Connected)
        finished(1, false)

        start(2)
        stateChanged(LoggedIn)
        finished(2, false)

        start(3)
        finished(3, false)

        start(4)
        dataTransferProgress(0, 3798)
        dataTransferProgress(2896, 3798)
        readyRead()
        dataTransferProgress(3798, 3798)
        readyRead()
        finished(4, false)

        start(5)
        stateChanged(Closing)
        stateChanged(Unconnected)
        finished(5, false)

        done(false)

The `dataTransferProgress()` signal in the above example is useful if you want to show a `progress bar` to inform the user about the progress of the download. The `readyRead()` signal tells you that there is data ready to be read. The amount of data can be queried then with the `bytesAvailable()` function and it can be read with the `read()` or `readAll()` function.

If the login fails for the above example, the signals would look like this:

        start(1)
        stateChanged(HostLookup)
        stateChanged(Connecting)
        stateChanged(Connected)
        finished(1, false)

        start(2)
        finished(2, true)

        done(true)

You can then get details about the error with the `error()` and `errorString()` functions.

For file transfer, QFtp can use both active or passive mode, and it uses passive file transfer mode by default; see the documentation for `setTransferMode()` for more details about this.

Call `setProxy()` to make QFtp connect via an FTP proxy server.

The functions `currentId()` and `currentCommand()` provide more information about the currently executing command.

The functions `hasPendingCommands()` and `clearPendingCommands()` allow you to query and clear the list of pending commands.

If you are an experienced network programmer and want to have complete control you can use `rawCommand()` to execute arbitrary FTP commands.

Warning: The current version of QFtp doesn't fully support non-Unix FTP servers.

See also:
  `QHttp`, `QNetworkAccessManager`, `QNetworkRequest`, `QNetworkReply`, and FTP Example.

Nested Class Summary
`static class` | `QFtp.Command` This enum is used as the return value for the `currentCommand()` function.
`static class` | `QFtp.Error` This enum identifies the error that occurred.
`static class` | `QFtp.State` This enum defines the connection state.
`static class` | `QFtp.TransferMode` FTP works with two socket connections; one for commands and another for transmitting data.
`static class` | `QFtp.TransferType` This enum identifies the data transfer type used with get and put commands.

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
`QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9`

Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal`

Field Summary
`QSignalEmitter.Signal2` | `commandFinished` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal1` | `commandStarted` This signal takes 1 generic argument(s).
`QSignalEmitter.Signal2` | `dataTransferProgress` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal1` | `done` This signal takes 1 generic argument(s).
`QSignalEmitter.Signal1` | `listInfo` This signal takes 1 generic argument(s).
`QSignalEmitter.Signal2` | `rawCommandReply` This signal takes 2 generic argument(s).
`QSignalEmitter.Signal0` | `readyRead` This signal is emitted in response to a `get()` command when there is new data to read.
`QSignalEmitter.Signal1` | `stateChanged` This signal takes 1 generic argument(s).

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`currentSender`

Constructor Summary
`QFtp()` Constructs a QFtp object with the given `parent`.
`QFtp(QObject parent)` Constructs a QFtp object with the given `parent`.

Method Summary
`void` | `abort()` Aborts the current command and deletes all scheduled commands.
`long` | `bytesAvailable()` Returns the number of bytes that can be read from the data socket at the moment.
`int` | `cd(java.lang.String dir)` Changes the working directory of the server to `dir`.
`void` | `clearPendingCommands()` Deletes all pending commands from the list of scheduled commands.
`int` | `close()` Closes the connection to the FTP server.
`int` | `connectToHost(java.lang.String host)` Connects to the FTP server `host` using port `port`.
`int` | `connectToHost(java.lang.String host, char port)` Connects to the FTP server `host` using port `port`.
`QFtp.Command` | `currentCommand()` Returns the command type of the FTP command being executed or `None` if there is no command being executed.
`QIODevice` | `currentDevice()` Returns the `QIODevice` pointer that is used by the FTP command to read data from or store data to.
`int` | `currentId()` Returns the identifier of the FTP command that is being executed or 0 if there is no command being executed.
`QFtp.Error` | `error()` Returns the last error that occurred.
`java.lang.String` | `errorString()` Returns a human-readable description of the last error that occurred.
`int` | `get(java.lang.String file)` Downloads the file `file` from the server.
`int` | `get(java.lang.String file, QIODevice dev)` Downloads the file `file` from the server.
`int` | `get(java.lang.String file, QIODevice dev, QFtp.TransferType type)` Downloads the file `file` from the server.
`boolean` | `hasPendingCommands()` Returns true if there are any commands scheduled that have not yet been executed; otherwise returns false.
`int` | `list()` Lists the contents of directory `dir` on the FTP server.
`int` | `list(java.lang.String dir)` Lists the contents of directory `dir` on the FTP server.
`int` | `login()` Logs in to the FTP server with the username `user` and the password `password`.
`int` | `login(java.lang.String user)` Logs in to the FTP server with the username `user` and the password `password`.
`int` | `login(java.lang.String user, java.lang.String password)` Logs in to the FTP server with the username `user` and the password `password`.
`int` | `mkdir(java.lang.String dir)` Creates a directory called `dir` on the server.
`int` | `put(QByteArray data, java.lang.String file)` Writes a copy of the given `data` to the file called `file` on the server.
`int` | `put(QByteArray data, java.lang.String file, QFtp.TransferType type)` Writes a copy of the given `data` to the file called `file` on the server.
`int` | `put(QIODevice dev, java.lang.String file)` Reads the data from the IO device `dev`, and writes it to the file called `file` on the server.
`int` | `put(QIODevice dev, java.lang.String file, QFtp.TransferType type)` Reads the data from the IO device `dev`, and writes it to the file called `file` on the server.
`int` | `rawCommand(java.lang.String command)` Sends the raw FTP command `command` to the FTP server.
`int` | `read(byte[] data)` Reads bytes from the stream into `buffer`.
`QByteArray` | `readAll()` Reads all the bytes available from the data socket and returns them.
`int` | `remove(java.lang.String file)` Deletes the file called `file` from the server.
`int` | `rename(java.lang.String oldname, java.lang.String newname)` Renames the file called `oldname` to `newname` on the server.
`int` | `rmdir(java.lang.String dir)` Removes the directory called `dir` from the server.
`int` | `setProxy(java.lang.String host, char port)` Enables use of the FTP proxy on host `host` and port `port`.
`int` | `setTransferMode(QFtp.TransferMode mode)` Sets the current FTP transfer mode to `mode`.
`QFtp.State` | `state()` Returns the current state of the object.

Methods inherited from class com.trolltech.qt.core.QObject
`childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty`

Methods inherited from class com.trolltech.qt.QtJambiObject
`dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr`

Methods inherited from class com.trolltech.qt.QSignalEmitter
`blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread`

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`__qt_signalInitialization`

Methods inherited from class java.lang.Object
`clone, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface com.trolltech.qt.QtJambiInterface
`disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership`

Field Detail

### commandFinished

    public final QSignalEmitter.Signal2 commandFinished

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: id), java.lang.Boolean(named: error)>:

  This signal is emitted when processing the command identified by `id` has finished. `error` is true if an error occurred during the processing; otherwise `error` is false.

See also:
  `commandStarted()` , `done()` , `error()`, and `errorString()`.

### commandStarted

    public final QSignalEmitter.Signal1 commandStarted

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: id)>:

  This signal is emitted when processing the command identified by `id` starts.

See also:
  `commandFinished()` , and `done()` .

### dataTransferProgress

    public final QSignalEmitter.Signal2 dataTransferProgress

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Long(named: done), java.lang.Long(named: total)>:

  This signal is emitted in response to a `get()` or `put()` request to indicate the current progress of the download or upload.

  `done` is the amount of data that has already been transferred and `total` is the total amount of data to be read or written. It is possible that the QFtp class is not able to determine the total amount of data that should be transferred, in which case `total` is 0. (If you connect this signal to a `QProgressBar`, the progress bar shows a busy indicator if the total is 0).

  Warning:`done` and `total` are not necessarily the size in bytes, since for large files these values might need to be "scaled" to avoid overflow.

See also:
  `get()`, `put()`, and `QProgressBar`.

### done

    public final QSignalEmitter.Signal1 done

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Boolean(named: error)>:

  This signal is emitted when the last pending command has finished; (it is emitted after the last command's `commandFinished()` signal). `error` is true if an error occurred during the processing; otherwise `error` is false.

See also:
  `commandFinished()` , `error()`, and `errorString()`.

### listInfo

    public final QSignalEmitter.Signal1 listInfo

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <com.trolltech.qt.network.QUrlInfo(named: i)>:

  This signal is emitted for each directory entry the `list()` command finds. The details of the entry are stored in `i`.

See also:
  `list()`.

### rawCommandReply

    public final QSignalEmitter.Signal2 rawCommandReply

  This signal takes 2 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: replyCode), java.lang.String(named: detail)>:

  This signal is emitted in response to the `rawCommand()` function. `replyCode` is the 3 digit reply code and `detail` is the text that follows the reply code.

See also:
  `rawCommand()`.

### readyRead

    public final QSignalEmitter.Signal0 readyRead

  This signal is emitted in response to a `get()` command when there is new data to read.

  If you specify a device as the second argument in the `get()` command, this signal is not emitted; instead the data is written directly to the device.

  You can read the data with the `readAll()` or `read()` functions.

  This signal is useful if you want to process the data in chunks as soon as it becomes available. If you are only interested in the complete data, just connect to the `commandFinished()` signal and read the data then instead.

See also:
  `get()`, `read()`, `readAll()`, and `bytesAvailable()`.

### stateChanged

    public final QSignalEmitter.Signal1 stateChanged

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: state)>:

  This signal is emitted when the state of the connection changes. The argument `state` is the new state of the connection; it is one of the `State` values.

  It is usually emitted in response to a `connectToHost()` or `close()` command, but it can also be emitted "spontaneously", e.g. when the server closes the connection unexpectedly.

See also:
  `connectToHost()`, `close()`, `state()`, and `State` .

Constructor Detail

### QFtp

    public QFtp()

  Constructs a QFtp object with the given `parent`.

### QFtp

    public QFtp(QObject parent)

  Constructs a QFtp object with the given `parent`.

Method Detail

### abort

    public final void abort()

  Aborts the current command and deletes all scheduled commands.

  If there is an unfinished command (i.e. a command for which the `commandStarted()` signal has been emitted, but for which the `commandFinished()` signal has not been emitted), this function sends an `ABORT` command to the server. When the server replies that the command is aborted, the `commandFinished()` signal with the `error` argument set to `true` is emitted for the command. Due to timing issues, it is possible that the command had already finished before the abort request reached the server, in which case, the `commandFinished()` signal is emitted with the `error` argument set to `false`.

  For all other commands that are affected by the `abort()`, no signals are emitted.

  If you don't start further FTP commands directly after the `abort()`, there won't be any scheduled commands and the `done()` signal is emitted.

  Warning: Some FTP servers, for example the BSD FTP daemon (version 0.3), wrongly return a positive reply even when an abort has occurred. For these servers the `commandFinished()` signal has its error flag set to `false`, even though the command did not complete successfully.

See also:
  `clearPendingCommands()`.

### bytesAvailable

    public final long bytesAvailable()

  Returns the number of bytes that can be read from the data socket at the moment.

See also:
  `get()`, `readyRead()` , `read()`, and `readAll()`.

### cd

    public final int cd(java.lang.String dir)

  Changes the working directory of the server to `dir`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### clearPendingCommands

    public final void clearPendingCommands()

  Deletes all pending commands from the list of scheduled commands. This does not affect the command that is being executed. If you want to stop this this as well, use `abort()`.

See also:
  `hasPendingCommands()`, and `abort()`.

### close

    public final int close()

  Closes the connection to the FTP server.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `Closing`, then `Unconnected`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `stateChanged()` , `commandStarted()` , and `commandFinished()` .

### connectToHost

    public final int connectToHost(java.lang.String host)

  Connects to the FTP server `host` using port `port`.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `HostLookup`, then `Connecting`, then `Connected`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `stateChanged()` , `commandStarted()` , and `commandFinished()` .

### connectToHost

    public final int connectToHost(java.lang.String host,
                                   char port)

  Connects to the FTP server `host` using port `port`.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `HostLookup`, then `Connecting`, then `Connected`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `stateChanged()` , `commandStarted()` , and `commandFinished()` .

### currentCommand

    public final QFtp.Command currentCommand()

  Returns the command type of the FTP command being executed or `None` if there is no command being executed.

See also:
  `currentId()`.

### currentDevice

    public final QIODevice currentDevice()

  Returns the `QIODevice` pointer that is used by the FTP command to read data from or store data to. If there is no current FTP command being executed or if the command does not use an IO device, this function returns 0.

  This function can be used to delete the `QIODevice` in the slot connected to the `commandFinished()` signal.

See also:
  `get()`, and `put()`.

### currentId

    public final int currentId()

  Returns the identifier of the FTP command that is being executed or 0 if there is no command being executed.

See also:
  `currentCommand()`.

### error

    public final QFtp.Error error()

  Returns the last error that occurred. This is useful to find out what went wrong when receiving a `commandFinished()` or a `done()` signal with the `error` argument set to `true`.

  If you start a new command, the error status is reset to `NoError`.

### errorString

    public final java.lang.String errorString()

  Returns a human-readable description of the last error that occurred. This is useful for presenting a error message to the user when receiving a `commandFinished()` or a `done()` signal with the `error` argument set to `true`.

  The error string is often (but not always) the reply from the server, so it is not always possible to translate the string. If the message comes from Qt, the string has already passed through tr().

### get

    public final int get(java.lang.String file,
                         QIODevice dev)

  Downloads the file `file` from the server.

  If `dev` is 0, then the `readyRead()` signal is emitted when there is data available to read. You can then read the data with the `read()` or `readAll()` functions.

  If `dev` is not 0, the data is written directly to the device `dev`. Make sure that the `dev` pointer is valid for the duration of the operation (it is safe to delete it when the `commandFinished()` signal is emitted). In this case the `readyRead()` signal is not emitted and you cannot read data with the `read()` or `readAll()` functions.

  If you don't read the data immediately it becomes available, i.e. when the `readyRead()` signal is emitted, it is still available until the next command is started.

  For example, if you want to present the data to the user as soon as there is something available, connect to the `readyRead()` signal and read the data immediately. On the other hand, if you only want to work with the complete data, you can connect to the `commandFinished()` signal and read the data when the `get()` command is finished.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

  `commandFinished()`

See also:
  `readyRead()` , `dataTransferProgress()` , and `commandStarted()` .

### get

    public final int get(java.lang.String file)

  Downloads the file `file` from the server.

  If `dev` is 0, then the `readyRead()` signal is emitted when there is data available to read. You can then read the data with the `read()` or `readAll()` functions.

  If `dev` is not 0, the data is written directly to the device `dev`. Make sure that the `dev` pointer is valid for the duration of the operation (it is safe to delete it when the `commandFinished()` signal is emitted). In this case the `readyRead()` signal is not emitted and you cannot read data with the `read()` or `readAll()` functions.

  If you don't read the data immediately it becomes available, i.e. when the `readyRead()` signal is emitted, it is still available until the next command is started.

  For example, if you want to present the data to the user as soon as there is something available, connect to the `readyRead()` signal and read the data immediately. On the other hand, if you only want to work with the complete data, you can connect to the `commandFinished()` signal and read the data when the `get()` command is finished.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

  `commandFinished()`

See also:
  `readyRead()` , `dataTransferProgress()` , and `commandStarted()` .

### get

    public final int get(java.lang.String file,
                         QIODevice dev,
                         QFtp.TransferType type)

  Downloads the file `file` from the server.

  If `dev` is 0, then the `readyRead()` signal is emitted when there is data available to read. You can then read the data with the `read()` or `readAll()` functions.

  If `dev` is not 0, the data is written directly to the device `dev`. Make sure that the `dev` pointer is valid for the duration of the operation (it is safe to delete it when the `commandFinished()` signal is emitted). In this case the `readyRead()` signal is not emitted and you cannot read data with the `read()` or `readAll()` functions.

  If you don't read the data immediately it becomes available, i.e. when the `readyRead()` signal is emitted, it is still available until the next command is started.

  For example, if you want to present the data to the user as soon as there is something available, connect to the `readyRead()` signal and read the data immediately. On the other hand, if you only want to work with the complete data, you can connect to the `commandFinished()` signal and read the data when the `get()` command is finished.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

  `commandFinished()`

See also:
  `readyRead()` , `dataTransferProgress()` , and `commandStarted()` .

### hasPendingCommands

    public final boolean hasPendingCommands()

  Returns true if there are any commands scheduled that have not yet been executed; otherwise returns false.

  The command that is being executed is not considered as a scheduled command.

See also:
  `clearPendingCommands()`, `currentId()`, and `currentCommand()`.

### list

    public final int list()

  Lists the contents of directory `dir` on the FTP server. If `dir` is empty, it lists the contents of the current directory.

  The `listInfo()` signal is emitted for each directory entry found.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `listInfo()` , `commandStarted()` , and `commandFinished()` .

### list

    public final int list(java.lang.String dir)

  Lists the contents of directory `dir` on the FTP server. If `dir` is empty, it lists the contents of the current directory.

  The `listInfo()` signal is emitted for each directory entry found.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `listInfo()` , `commandStarted()` , and `commandFinished()` .

### login

    public final int login(java.lang.String user)

  Logs in to the FTP server with the username `user` and the password `password`.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `LoggedIn`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### login

    public final int login()

  Logs in to the FTP server with the username `user` and the password `password`.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `LoggedIn`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### login

    public final int login(java.lang.String user,
                           java.lang.String password)

  Logs in to the FTP server with the username `user` and the password `password`.

  The `stateChanged()` signal is emitted when the state of the connecting process changes, e.g. to `LoggedIn`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### mkdir

    public final int mkdir(java.lang.String dir)

  Creates a directory called `dir` on the server.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### put

    public final int put(QIODevice dev,
                         java.lang.String file)

  Reads the data from the IO device `dev`, and writes it to the file called `file` on the server. The data is read in chunks from the IO device, so this overload allows you to transmit large amounts of data without the need to read all the data into memory at once.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  Make sure that the `dev` pointer is valid for the duration of the operation (it is safe to delete it when the `commandFinished()` is emitted).

### put

    public final int put(QIODevice dev,
                         java.lang.String file,
                         QFtp.TransferType type)

  Reads the data from the IO device `dev`, and writes it to the file called `file` on the server. The data is read in chunks from the IO device, so this overload allows you to transmit large amounts of data without the need to read all the data into memory at once.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  Make sure that the `dev` pointer is valid for the duration of the operation (it is safe to delete it when the `commandFinished()` is emitted).

### put

    public final int put(QByteArray data,
                         java.lang.String file)

  Writes a copy of the given `data` to the file called `file` on the server. The progress of the upload is reported by the `dataTransferProgress()` signal.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

  Since this function takes a copy of the `data`, you can discard your own copy when this function returns.

See also:
  `dataTransferProgress()` , `commandStarted()` , and `commandFinished()` .

### put

    public final int put(QByteArray data,
                         java.lang.String file,
                         QFtp.TransferType type)

  Writes a copy of the given `data` to the file called `file` on the server. The progress of the upload is reported by the `dataTransferProgress()` signal.

  The data is transferred as Binary or Ascii depending on the value of `type`.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

  Since this function takes a copy of the `data`, you can discard your own copy when this function returns.

See also:
  `dataTransferProgress()` , `commandStarted()` , and `commandFinished()` .

### rawCommand

    public final int rawCommand(java.lang.String command)

  Sends the raw FTP command `command` to the FTP server. This is useful for low-level FTP access. If the operation you wish to perform has an equivalent QFtp function, we recommend using the function instead of raw FTP commands since the functions are easier and safer.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `rawCommandReply()` , `commandStarted()` , and `commandFinished()` .

### readAll

    public final QByteArray readAll()

  Reads all the bytes available from the data socket and returns them.

See also:
  `get()`, `readyRead()` , `bytesAvailable()`, and `read()`.

### remove

    public final int remove(java.lang.String file)

  Deletes the file called `file` from the server.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### rename

    public final int rename(java.lang.String oldname,
                            java.lang.String newname)

  Renames the file called `oldname` to `newname` on the server.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### rmdir

    public final int rmdir(java.lang.String dir)

  Removes the directory called `dir` from the server.

  The function does not block and returns immediately. The command is scheduled, and its execution is performed asynchronously. The function returns a unique identifier which is passed by `commandStarted()` and `commandFinished()` .

  When the command is started the `commandStarted()` signal is emitted. When it is finished the `commandFinished()` signal is emitted.

See also:
  `commandStarted()` , and `commandFinished()` .

### setProxy

    public final int setProxy(java.lang.String host,
                              char port)

  Enables use of the FTP proxy on host `host` and port `port`. Calling this function with `host` empty disables proxying.

  QFtp does not support FTP-over-HTTP proxy servers. Use `QHttp` for this.

### setTransferMode

    public final int setTransferMode(QFtp.TransferMode mode)

  Sets the current FTP transfer mode to `mode`. The default is `QFtp::Passive` .

See also:
  `QFtp::TransferMode` .

### state

    public final QFtp.State state()

  Returns the current state of the object. When the state changes, the `stateChanged()` signal is emitted.

See also:
  `State` , and `stateChanged()` .

### read

    public final int read(byte[] data)

  Reads bytes from the stream into `buffer`. The method returns the bytes read or -1 if an error occurred.

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