MSDN for GetExitCodeThread() says "The handle must have the THREAD_QUERY_INFORMATION access right." So it could be a permissions issue.
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How to get return value from a thread
// Thread function
extern uint ThreadTest(LPVOID pParam)
{
uint uExitCode = 2;
return uExitCode;
}
// Main function
CWinThread *pThread = AfxBeginThread(ThreadTest,
if(pThread)
{
// Wait for thread to finish
WaitForSingleObject(pThrea
DWORD threadVal=5;
CString tempStr;
// Show result
BOOL retVal=GetExitCodeThread(p
tempStr.Format("ThreadVal is %u",threadVal);
Diag(tempStr); // This prints the string to a text window
}
-----
I am trying to get a return value from a thread. Using the code above, the return value is always '5' which is the value I initialize it to. I expect the result to be '2' as per the Thread function above. What am I doing wrong?
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Answers
GetLastError returns '6'. I looked but couldn't seem to find the text message for this.
I tried using (LPSECURITY_ATTRIBUTES)THR
>>>> CWinThread *pThread = AfxBeginThread
I assume the handle is no longer valid as you created the thread by call AfxBeginThread ... That is a wrapper that most likely freed the handle in pThread->m_handle somehow (e. g. by a hook), so that it was invalid after returning. If I am right, you may have an error at WaitForSingleObject as well.
You could come out of this by calling CreateThread instead of AfxBeginThread.
Regards, Alex
I got it working... had to change the 'AutoDelete' param to false to be able to access the exit value after the thread dies. I think the only downfall is I have to manually delete the thread object when I'm done with it (fine with me).
So the thread setup changes to:
// Main function
CWinThread *pThread = AfxBeginThread(ThreadTest,
if(pThread)
{
pThread->m_bAutoDelete = FALSE;
pThread->ResumeThread();
...
There should be a way to set the AutoDelete when you create the thread... not sure about that one.
Thanx for the help
Paul
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by: itsmeandnobodyelsePosted on 2007-09-26 at 13:29:56ID: 19966505
You have to check the retval. I assume it is false. If so, the GetLastError() should give evidence what was wrong.
Regards, Alex