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POHow to get WM_TOUCH messages in a message-only window
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  1. POHow to get WM_TOUCH messages in a message-only window
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    copied!<p>I've just begun a project and I want to receive all the touch events from a touch screen to process them, whichever the active window. I am using the Win32 API with C++ (I am new to Win32 programming). I'd like to use a message-only window but I don't succeed in getting WM_TOUCH message with it (though I think it is properly created and registered for touch events). Here is my function which initialises the message-only window.</p> <pre><code>HWND InitMessageOnlyWindow(HINSTANCE hInstance, int nCmdShow) { LPWSTR szWindowClassName = TEXT("msgOnly"); WNDCLASSEX windowClass; memset(&amp;windowClass, 0, sizeof(windowClass)); windowClass.cbSize = sizeof(windowClass); windowClass.lpfnWndProc = WndProc; windowClass.lpszClassName = szWindowClassName; if(RegisterClassEx(&amp;windowClass)==0) { std::cerr &lt;&lt; "RegisterClass" &lt;&lt; std::endl; return 0; } HWND hWindow = CreateWindow( szWindowClassName, L"", 0, 0, 0, 0, 0, HWND_MESSAGE, 0, 0, 0); if (!hWindow) { std::cerr &lt;&lt; "CreateWindow" &lt;&lt; std::endl; return 0; } if(RegisterTouchWindow(hWindow, 0)==0) { std::cerr &lt;&lt; "RegisterTouchWindow" &lt;&lt; std::endl; return 0; } return hWindow; } </code></pre> <p>I've tested the followings:</p> <ul> <li>to get WM_INPUT messages in the message-only window, it works.</li> <li>to get WM_TOUCH messages in a classic window, it works.</li> </ul> <p>According to this <a href="https://stackoverflow.com/questions/3104509/getting-input-if-the-window-is-not-active-windows">post</a> the message-only window needs to be active. I tried it, the result is odd, SetActiveWindow returns NULL (so there should be a problem) but GetLastError does not hold it. This does not make my program work. I have not dig into the hook thing yet, I'd like to know why this does not work first.</p> <p>Thanks.</p>
 

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