In QT multi-threaded programming, you can use signals and slots for thread communication

In QT multi-threaded programming, you can use signals and slots for thread Communication. The following is a simple example.

The program implements a thread to customize a signal and slot, timing 1 seconds to send a signal, slot response after printing a message.

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2. #include <QtCore/QCoreApplication>   

4. #include <QThread>   

6. #include <stdio.h>   

8. class MyThread: public Qthread

10. {

12. Q_object

14. public :  

16. MyThread ();

18. void  Stop ();

20. Private :  

22. BOOL  isrunning;

24. void  Run ();

26. public slots:

28. void  showmsg ();

30. Signals:

32. void  msg ();

34. };

36. Mythread::mythread ()

38. {

40.      isrunning = true ;  

42. Connect (This, SIGNAL (msg ()),This, SLOT (showmsg ()), Qt::D irectconnection);

44. }

46. void mythread::showmsg ()

48. {

50. printf ("hello!\n");

52. }

54. void Mythread::run ()

56. {

58. while (isrunning)

60. {

62. Sleep (1);

64. Emit msg ();

66. }

68. printf ("exit!\n");

70. }

72. void mythread::stop ()

74. {

76. IsRunning = false;

78. }

80. int Main (int argc, char *argv[])

82. {

84. Qcoreapplication a (argc, argv);

86. MyThread mthread;

88. Mthread.start ();

92. while (1)

94. {

96. if (getchar () = =' B ')

98. {

100. Mthread.stop ();

102. Mthread.wait ();

104. break  ;

106. }

108. }

110. return  a.exec ();

112. }

114. #include "main.moc"   

When compiling in QT creator, you need to compile with "qmake" to generate the MOC File. Then compile with the build Project.

PS:QT Meta-object System

In QT multi-threaded programming, you can use signals and slots for thread communication