Solved

Thread with 500 points and Grade A

Posted on 2007-03-22
5
199 Views
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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
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

Featured Post

Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question