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    <p>As others have already pointed out</p> <ul> <li>In general, an application can have zero or multiple top-level windows.</li> <li>If you're creating the window yourself you can just remember the HWND somewhere.</li> </ul> <p>But maybe your code is in a DLL, so you didn't actually create the top-level window yourself. So what to do?</p> <p>I would suggest the following:</p> <ul> <li>Use <code>EnumWindows</code> to enumerate all top-level windows.</li> <li>Use <code>GetWindowLongPtr</code> to get the HINSTANCE for each top-level window. Compare this against the HINSTANCE of the application, which you can get using <code>GetModuleHandle(NULL)</code>. If they're identical, you've found your main window.</li> </ul> <p>Edit: Here is some code. Turns out you also have to use <code>IsWindowVisible</code> because there seem to be quite a few invisible "helper" windows.</p> <pre><code>HWND hwndMain; BOOL CALLBACK EnumWindowProc(HWND hwnd, LPARAM lParam) { HINSTANCE hinst=(HINSTANCE)GetModuleHandle(NULL); if((HINSTANCE)GetWindowLongPtr(hwnd, GWL_HINSTANCE)==hinst &amp;&amp; IsWindowVisible(hwnd)) { hwndMain=hwnd; return FALSE; } else return TRUE; } </code></pre> <p>Then in the place you want to find the window:</p> <pre><code>hwndMain=NULL; EnumWindows(EnumWindowProc, 0); </code></pre> <p>And after this, <code>hwndMain</code> should contain the handle of the window, or <code>NULL</code> if none exists.</p> <p>Using <code>EnumWindows</code> is a bit burdensome but is recommended over calling <code>GetWindow</code> in a loop because, as MSDN notes: "An application that calls GetWindow to perform this task risks being caught in an infinite loop or referencing a handle to a window that has been destroyed."</p>
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    1. POgetting the HWND for my own application in C
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    1. USMartin B
    1. USMartin B
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    1. COThanks. That looks like a lot of code to get something so simple. Do you have an sample?
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