DoEvents in MFC?

[dougrockwell]

my program has function that incorperates an intensive and long loop for testing purposes. i want to know if there is a function i can call, or a way to implement a function, that will check to see if there are any other events waiting in the queue to be handled. that way i can have an option to abort the process if the user so desires.

thanks,
D

[souldog]

well, yes
It all depends on how you are running the loop.

If you are running it in the GUI thread, (which you should not) Then you can use
GetMessage() and DispatchMessage() to pump the message queue;

here is an example

void FOO::OnClickStartButton() 
{

	while (true)
	{
		MSG msg;
		while(PeekMessage(&msg, GetSafeHwnd(), 0, 0, PM_REMOVE))
		{
			DispatchMessage(&msg);
		}
		if(KillDAQ_)
		{
			DAQRunning_ = false;
			return;
		}
		
		//// LOTS OF PROCESSING DOWN HERE
	}
}

void FOO::OnClickStopButton() 
{
	KillDAQ_ = true;	
}

If you are running the long process in a worker thread then you can use kernal event for synchronization

unsigned __stdcall FOO::WorkerThread( LPVOID pParam )
{

	std::auto_ptr<FOO_WORKER_DATA> thread_data(static_cast<FOO_WORKER_DATA*>(pParam));
			
		
	while(true)
	{	
		if(WAIT_OBJECT_0 == ::WaitForSingleObject(thread_data->MurderThreadEvent_, 0))
		{
			return 0;
		}

		//LOTS OF PROCESSING DOWN HERE
	}
				
	return 0;

}

Here, MurderThreadEvent_ is an event that can be set in the gui thread or where ever.

[upashu2]

MSG msg; // can be declared globally, in application source file

void DoEvents()
{
if(::PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
::TranslateMessage(&msg);
:ispatchMessage(&msg);
}
}

[dougrockwell]

Thanks, that worked great!

[Alin]

Thanks, that worked great!

i think you should you souldog's second solution (worker thread)