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POdetermining whether a window is in desktop bounds c++
 

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  1. POdetermining whether a window is in desktop bounds c++
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    <p>I wrote some code to determinate whether a certain window is inside the desktop bounds.<br /> Somehow, it doesn't work. For every window, regardless whether it is inside or outside the desktop, <code>false</code> is returned. Something is terribly wrong here, but after staring at this piece of code for 3 hours now, I still don't know where the problem is. If I try to read a RECT struct from the pointer sent in the PMSG's WPARAM, I get a AccessViolationException. Why is this happening?</p> <p>My code look like this, and always returns false:</p> <pre><code>static bool IsInBounds(HWND window) { DEVMODE d; d.dmSize = sizeof(DEVMODE); BOOL b = EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &amp;d); if(b == FALSE) { PostMessage(FindWindow(NULL, L"Window #1"), RegisterWindowMessage(L"FMSG"), (WPARAM)window, NULL); } RECT R; GetWindowRect(window, &amp;R); POINT p = POINT(); p.x = (LONG)d.dmPelsWidth; p.y = (LONG)d.dmPelsHeight; PostMessage(FindWindow(NULL, L"Window #1"), RegisterWindowMessage(L"PMSG"), (WPARAM)&amp;R, d.dmPelsWidth); if(R.right &lt; 0 || R.bottom &lt; 0 || R.left &gt; (LONG)d.dmPelsWidth || R.top &gt; (LONG)d.dmPelsHeight) { return false; } return true; } </code></pre> <p>EDIT: after calling IsInBounds, which returned an error number 1400 (Invalid window handle), but before returning from the hook callback, I called <code>IsWindow(window)</code>, to see, if my handle is still valid. The truth is: it <strong>is in deed</strong> a valid handle! How can it be that GetWindowRect says its an invalid handle?</p> <p>EDIT: I tried MonitorFromWindow as sujested, but it returned NULL, and calling GetLastError resulted in error no. 1400, which is already familiar to me. Looks like MonitorFromWindow implicitly calls GetWindowRect. I don't care about the size, but is there <strong>another</strong> way to get window coordinates from a handle?</p>
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    1. COReads a bit weird.. For instance if `EnumDisplayettings` fails, there's no point in getting pixel values from `DEVMODE`. The code, instead, posts some message and continues??
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    2. COYeah, thats because the code is inside a c++ DLL, and posts a message to my C# app. The weird thing is, that it *Does not fail*
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    3. COWhat kind of window is it failing on? A specific type of window or everything? I have never tested this, but maybe message only windows don't have a size at all...
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