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etsuja

function looping in windows

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How do I make a function constantly loop while a windows program is running without ignoring the windows message loop?

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You could poll using PeekMessage, instead of using GetMessage which blocks. If a message exists, then Translate and Dispatch it.

No threads required.

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I'm trying to do this and it's not working


do
{
if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
if (msg.message == WM_QUIT) break;
TranslateMessage(&msg);
DispatchMessage(&msg);

}

SendRcv();
}
while(TRUE);




doesn't seem to be accepting any messages. I can't click any menu items.

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Then I guess this method won't work for me... all that's in that function right now is a recvfrom() function.

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Windows Sockets are set to default to blocking unless you explicitly disable blocking with ioctlsocket and the FIONBIO argument. You'll have to then properly handle the WSAEWOULDBLOCK return value from recvfrom.

Writing code which polls everything (sockets, messages, objects, etc) is a lot harder to manage. Putting your network code on a separate thread while keeping the message pump in blocking mode on the main thread would probably be the most ideal situation.

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Sure, if you're using MFC.

But you can't have any blocking calls within OnIdle. And OnIdle is only called when the application's message queue is empty.

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K, well I guess I'm gonna be forced to use threads, I've never used them before though so I have another question that I don't see answered on msdn. how do you check to see if a thread is running?

EDIT:nevermind, I was gonna use the loop previously mentioned and create a new thread, check to see if it was running and if not destroy it every iteration but now I'm just creating a thread at initialisation that runs a constantly looped function. I just hope I can get away with running unsychronized threads.

[Edited by - etsuja on May 22, 2006 11:23:05 PM]

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You can test if a thread is still running or not with WaitForSingleObject. Pass it the handle of the thread and a timeout of zero. If the thread is still running it returns WAIT_OBJECT_0, I believe.

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