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Asked
9 years, 4 months ago

Modified
9 years, 4 months ago

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Though I've had plenty of software experience I've not done a great deal of Windows programming. I'm trying to post a WM_USER message from a thread so that it gets picked up in the main UI thread but I'm having some trouble. This is in C++ using VS2010 and MFC.
Declared the handler function as follows,
As far as I can see this is all in line with what MSDN says as stated here.
Can anyone let me know what the problem is?
Trending sort is based off of the default sorting method — by highest score — but it boosts votes that have happened recently, helping to surface more up-to-date answers.
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CMyApp inherits from CWinApp, which inherits from CWinThread. CWinThread user-defined messages take a special macro in their message map for what you want to do:
Assuming DoSomething() is a member of your CMyApp class.
See the documentation on ON_THREAD_MESSAGE() for more information.
THe problem is that the message map expects a function on a CWnd, whereas your class clearly is not a CWnd, either by virtue of actually being such or inheriting from CWnd.
The function expects you to pass a method of CWnd that takes a WPARAM and an LPARAM, but you're passing in a function of CMyApp.
Make the CMyApp class extend off of the CWnd class:
If this isn't possible, then you're going to have to find a way to pass in a function of CWnd or any other function of a class that extends off of CWnd with the right parameters and return type.
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