Re: CEvent & WaitForSingleObject (auto-reset)

"Alexander Grigoriev" <>
Thu, 2 Jul 2009 07:24:16 -0700
You can't use your CEvent pointer as an argument of WaitForSingleObject.
It's not an event handle.

And first of all, DON'T USE CEvent. Use ATL::CEvent, which is more sane.
MFC::CEvent is braindead.

"Jimbo_Jimbob_Jiminator" <>
wrote in message

Haven't been here in a while. Haven't been doing any Windows programming
some time.

I have an issue with CEvent & WaitForSingleObject. The likely issue is
I have no idea what I'm doing but, if we put that aside and pretend that I
have a clue, it goes like this:

The default implementation for CEvent is auto-reset. That is how I want to
use it. I have only a main tread and a second thread so I do not have
threads waiting.

I have looked in books and all over the web and all of the examples seem
show how to start a thread or stop a thread with an event. In this case,
auto-reset is not that useful if you only have one worker thread anyway.

I am trying to control when a loop runs with the event. The issue is that
once the user clicks the button to allow the progress bar to be updated
it just keeps updating through completion. I figure that the state of the
CEvent should auto-reset and it should not run another iteration until the
user intiates it.


Here are some code snips that show it:

//This is primarily from an example I found on the web. I added the
//WaitForSingleObject as a test case.
UINT TestThread(LPVOID lParam)
AfxMessageBox("Bite Me");

for(int i=0;i<100;i++)
::WaitForSingleObject(pTis->pEvent, INFINITE) == WAIT_OBJECT_0;
//This sends a message to the main thread to update the status bar
delete pTis;
return 0;

void CPPage1::OnBnClickedButton1()
//Testing Wait Single Object. Sends message to main dlg that user clicked
//the button
LRESULT Rslt = ::SendMessage(m_pMainWnd->m_hWnd , UWM_TEST_WSO, 0, 0);

//User clicked the button set event to allow progress bar another tick.
return 0;

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