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Posted on 2007-03-22
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Last Modified: 2013-11-26
I am a server listening to the client and receiving the message from the client periodically. This is under one thread.
Actually the situation is........

When I click on the button ....The event handler in the button creates a new thread for me and handles the messages that I receive from the client and in the Button handler I need to Paint the form accordingly as per the  messages received from the client.

Here is the code......

 public: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {

ThreadStart ^myThreadDelegate = gcnew ThreadStart(this, &CppDraw::Form1::repeat);
                                     trd = gcnew Thread(myThreadDelegate);

 trd->Start();

}

Outside the button handler.......

private: void repeat()
{      
      FILE *fd;

    fd = fopen("rd_log1.txt","w");

            
      do
      {
      
        memset(buffer,NULL,sizeof(buffer));

        iResult = recv(s,buffer,256,NULL);

        Sleep(1000);

        fprintf(fd,"\n\n The value of iResult is %s \n\n ",buffer);
      }while(iResult!=-1);

}

Here my issue is when I receive the message from the client inside the thread I want to pass this data to the clent and paint the form accordingly.....

Any idea on how to do this.........
0
Comment
Question by:tatikor_143
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5 Comments
 
LVL 11

Expert Comment

by:DeepuAbrahamK
ID: 18777656
Inside the thread do a postmessage() to the button handler using the valid window handle. That will solve your problem.
Best Regards,
DeepuAbrahamK
0
 

Author Comment

by:tatikor_143
ID: 18779861
Can U post some sample code .........

Its highly appreciated.....
0
 
LVL 11

Accepted Solution

by:
DeepuAbrahamK earned 500 total points
ID: 18784732
//Calling a thread
hThread = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)MyThreadProc,this,0,NULL); // 'this' is the class object from which you call the thread.

//Thread proc
DWORD WINAPI MyThreadProc(LPVOID lpVoid)
{

// CMyClass* pMyclass = reinterpret_cast<CMyClass*>(lpVoid); assume that you are passing CMyclass object.
// pMyClass-> Call any funtion...if you wish...
//pass a valid handle to the window in which you want to post the message...pMyclass->m_hWnd
 ::PostMessage(pMyclass->m_hWnd, WM_MYBUTTON, (WPARAM)0,(LPARAM)0);

}

In you dialog class header

#define WM_MYBUTTON      WM_USER+1

BEGIN_MESSAGE_MAP(CMyDialog, CDialog)
//{{AFX_MSG_MAP(CMyDialog)
ON_MESSAGE(WM_MYBUTTON,OnMyButtonPress)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

Hope this will give you the idea...you may need to tweak it a bit to make it work on your program..
Please shout if you need more help...

Best Regards,
DeepuAbrahamK
Its better to use PostMessage so the worker thread doesn't have to wait while the main thread processes.
0
 

Author Comment

by:tatikor_143
ID: 18789902
Hi,

I am using WM_COPYDATA to resolve the above issue . I am able to send the data but not able to receive it....

How to implement...............

Thanks


0
 

Author Comment

by:tatikor_143
ID: 18795922
Fixed......
0

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