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Posted 18 Jun 2002

Using AfxBeginThread with class member controlling function

, 19 Jun 2002 CPOL
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Create worker threads with class member controlling function


Creating a separate thread in your application in order to execute some time consuming operations is very simple. You just call AfxBeginThread() with the appropriate parameters and that's it. But Microsoft wants the controlling function either to be a global function or to be a static class member function; which in both cases means that you don't have access to your class member variables or methods from within the controlling function. This article shows you a little trick on how to do this and keep your source OO.


  1. Create your project as usual, add your dialogs, controls and all the stuff.
  2. Create your classes for the dialogs using Class Wizard, and assign variables to your controls.
  3. For the class you want to implement multithreading, edit the header file adding the following code:
    //controlling function header
    static UINT StartThread (LPVOID param);
    //structure for passing to the controlling function
    typedef struct THREADSTRUCT
        CThreadDemoDlg*    _this;
            //you can add here other parameters you might be interested on
  4. In the implementation file for your class, add the following code:
    UINT CThreadDemoDlg::StartThread (LPVOID param)
        THREADSTRUCT*    ts = (THREADSTRUCT*)param;
        //here is the time-consuming process 
        //which interacts with your dialog
        AfxMessageBox ("Thread is started!");
            //see the access mode to your dialog controls
        ts->_this->m_ctrl_progress.SetRange (0, 1000);  
        while (ts->_this->m_ctrl_progress.GetPos () < 1000)
            ts->_this->m_ctrl_progress.StepIt ();
        //you can also call AfxEndThread() here
        return 1;
    void CThreadDemoDlg::OnStart() 
            //call the thread on a button action or menu
        THREADSTRUCT *_param = new THREADSTRUCT;
        _param->_this = this;
        AfxBeginThread (StartThread, _param);
  5. Now you can test your program!


I hope this will be helpful for you. I've been using CodeProject for a long time and this article is the first step for payback.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

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Romania Romania
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Comments and Discussions

GeneralAlso on memory leak Pin
chiac2-Apr-06 19:46
memberchiac2-Apr-06 19:46 
GeneralThanks Pin
dhammeriz12-Dec-05 8:09
memberdhammeriz12-Dec-05 8:09 
GeneralMemory leak on THREADSTRUCT Pin
srev21-Jun-05 3:54
membersrev21-Jun-05 3:54 
GeneralRe: Memory leak on THREADSTRUCT Pin
Anonymous19-Oct-05 3:45
sussAnonymous19-Oct-05 3:45 
GeneralRe: Memory leak on THREADSTRUCT Pin
ciyoung16-Feb-06 18:36
memberciyoung16-Feb-06 18:36 
GeneralUnhandled Exception Pin
Anonymous26-May-04 3:44
sussAnonymous26-May-04 3:44 
GeneralStop Thread Pin
aman20066-May-04 6:57
memberaman20066-May-04 6:57 
GeneralRe: Stop Thread Pin
Enis6-May-04 7:34
memberEnis6-May-04 7:34 
GeneralRe: Stop Thread Pin
j.v.r.25-Aug-10 8:47
memberj.v.r.25-Aug-10 8:47 
GeneralStop Thread Problem Pin
aman20065-May-04 15:52
memberaman20065-May-04 15:52 
win32newb3-Mar-04 18:01
memberwin32newb3-Mar-04 18:01 
GeneralRe: HELP PLEASE Pin
Jens Winslow17-Mar-04 7:13
memberJens Winslow17-Mar-04 7:13 
GeneralRe: HELP PLEASE Pin
win32newb19-Mar-04 12:02
memberwin32newb19-Mar-04 12:02 
GeneralRe: HELP PLEASE Pin
jens winslow22-Mar-04 7:34
memberjens winslow22-Mar-04 7:34 
GeneralI thought you were supposed to pass handles, not pointers to objects into threads??? Not that that seems to work for me (HELP Please!) Pin
Jens Winslow18-Jul-03 13:47
memberJens Winslow18-Jul-03 13:47 
GeneralCorrection: AfxBeginThread(MyProcc, this-&gt;GetSafeHwnd()) NOT AfxBeginThread(MyProcc, this-&gt;AfxGetSafeHwnd()) Pin
Jens Winslow18-Jul-03 13:53
memberJens Winslow18-Jul-03 13:53 
Generalusing new to declare member might work Pin
Jens Winslow21-Jul-03 6:40
memberJens Winslow21-Jul-03 6:40 
GeneralRe: using new to declare member might work Pin
Anonymous22-Jul-03 20:24
sussAnonymous22-Jul-03 20:24 
GeneralRe: using new to declare member might work Pin
Jens Winslow23-Jul-03 4:59
memberJens Winslow23-Jul-03 4:59 
GeneralRe: using new to declare member might work Pin
Enis23-Jul-03 5:17
memberEnis23-Jul-03 5:17 
GeneralRe: using new to declare member might work Pin
Jens Winslow23-Jul-03 8:09
memberJens Winslow23-Jul-03 8:09 
GeneralWhy a Functor rather than structure with pointers you might ask Pin
Jens Winslow23-Jul-03 11:15
memberJens Winslow23-Jul-03 11:15 
GeneralAnd just one more thing....I hope Pin
Jens Winslow23-Jul-03 13:11
memberJens Winslow23-Jul-03 13:11 
Generalthanks Pin
basil00320-Mar-03 14:28
memberbasil00320-Mar-03 14:28 
GeneralYES!!!! Pin
aquawicket23-Oct-06 4:50
memberaquawicket23-Oct-06 4:50 

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