I use qftp to upload a test file in qmainwindow,but failed,Even i cannot pick up the signal,I think the code is right,why?
Qt Code: 
  1. ////////////////cfrmmain.h
  2. class frmMainWindow:public QMainWindow,public Ui::MainWindow 
  3. {
  4. 	Q_OBJECT
  5. public:
  6. 	frmMainWindow();
  7. private:
  8.  
  9. 	QFtp *ftp; //连接FTP
  10. 	QFile *file;
  11. 	QStringList fileList;
  12.  
  13. private slots:
  14. 	void btnStartClicked();	
  15. 	void ftpListInfo(const QUrlInfo &urlInfo);
  16. 	void ftpCommandFinished(int commandId, bool error);
  17. 	void updateDataTransferProgress(qint64 readBytes,qint64 totalBytes);
  18. };
  19. /////////////////cfrmmain.cpp/////////
  20. frmMainWindow::frmMainWindow()
  21. {
  22. 	setupUi(this);	
  23. 	connect(startSCP,SIGNAL(clicked()),this ,SLOT(btnStartClicked()));	
  24. 	ftp=0;
  25. }
  26. void frmMainWindow::btnStartClicked()
  27. {
  28.    	if (ftp) {
  29. 		ftp->abort();
  30. 		ftp->deleteLater();
  31. 		ftp = 0;
  32. 		return;
  33. 	}
  34.  
  35. 	ftp = new QFtp;
  36. 	connect(ftp, SIGNAL(commandFinished(int, bool)),
  37. 		this, SLOT(ftpCommandFinished(int, bool)));
  38. 	connect(ftp, SIGNAL(listInfo(const QUrlInfo &)),
  39. 		this, SLOT(ftpListInfo(const QUrlInfo &)));
  40. 	connect(ftp, SIGNAL(dataTransferProgress(qint64, qint64)),
  41. 		this, SLOT(updateDataTransferProgress(qint64, qint64)));
  42.  
  43. 	ftp->connectToHost("ftp.trolltech.com");
  44. 	ftp->login();
  45. 	ftp->list();
  46.  
  47. }
  48.  
  49.  
  50. [COLOR="Red"]/////////////////all the SLOT function cannot performed ,why????????[/COLOR]
  51. void frmMainWindow::ftpCommandFinished(int, bool error)
  52. {
  53.  
  54. 	if (ftp->currentCommand() == QFtp::ConnectToHost) {
  55. 		if (error) {
  56. 			QMessageBox::information(0, tr("FTP"),
  57. 				tr("Unable to connect to the FTP server "
  58. 				"at %1. Please check that the host "
  59. 				"name is correct.")
  60. 				.arg("192.168.1.3"));			
  61. 			return;
  62. 		}		
  63. 		return;
  64. 	}
  65.  
  66. 	if (ftp->currentCommand() == QFtp::Get) {
  67.  
  68.  
  69. 	} 
  70. 	if (ftp->currentCommand() == QFtp::List) {
  71. 		QMessageBox::information(0, tr("FTP"),"LIST");
  72.  
  73. 	}
  74. 	if (ftp->currentCommand() == QFtp::Put) {
  75.  
  76. 	}
  77. }
  78.  
  79. void frmMainWindow::updateDataTransferProgress(qint64 readBytes,
  80. 												qint64 totalBytes)
  81. {
  82.  
  83.  
  84. void frmMainWindow::ftpListInfo(const QUrlInfo &urlInfo)
  85. {
  86. 	fileList<<urlInfo.name() ;
  87. }
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