Re: [msvc] Posting a message

Neil Devlin Sat, 30 Apr 2005 02:37:55 -0700

HI Jason,
I  have the following in my stdafx.h file:

// string message allocator for posting messages between windows...
static char* AllocBuffer(char *strMsg)
{
int nLen = strlen(strMsg)+1;//strMsg.GetLength();
char *pBuffer = new char[nLen+1];

strcpy(pBuffer,(const char*)strMsg);

ASSERT(pBuffer != NULL);
return pBuffer;
}


and use it within my postmesage function as:
   char Tmp[40];
strcpy(Tmp,"TEST");
  ::PostMessage(m_DialogHWND,WM_MESSAGEHERE,0,(LPARAM) AllocBuffer(Tmp));

and within my posted message I delete it:
LRESULT CTelServerDlg::OnSendUpdatedStation(WPARAM wParam, LPARAM lParam)
{
char* pString = reinterpret_cast<char*>(lParam);
PER_HANDLE_DATA *TmpHandleData=PerHandleData;
delete [] pString;
return 0;
}

As I am using 2 processors, and having 4 threads in my IOCP. If for example 4 threads do a Postmessages with he same message,(for example the above message). When the system comes to execute the function 4 times, does it wait until one is finished before doing the next one? If not, suppose I am better doing a EnterCriticalSection(..) and LeaveCriticalSection(..) withn the routine?

Thanks for the help
Neil

----- Original Message ----- From: "Jason Teagle" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, April 30, 2005 10:23 AM Subject: RE: [msvc] Posting a message

I have a couple of threads created with socket IOCP. Is it safe to post a
message
within the thread? I occasionally got an error , which I think codewarrior
point it to a
::SendMessage(..) command within my thread. I changed the ::SendMessage(..)
to
::PostMessage(..) and seams to be fine. Can it be that SendMessage() waits
until
the Send routine is complete, and Post message posts the message in returns immediately? I have a handle to the main dialog box in which I use in the
first
parameter of PostMessage.
Yes, SendMessage() waits for a response from the message handler, whereas
PostMessage returns immediately. Just be careful with any data passed
through PostMessage() as pointers, though, since it needs to still exist
even when PostMessage() returns - otherwise when the handler comes to
process it, the pointer would point to no-man's land and you'd be in
trouble.
--
Jason Teagle
[EMAIL PROTECTED]
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Re: [msvc] Posting a message

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