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POWindows+Python: Why is the first opened window not shown active?
 

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    <p>I have found a very strange problem about using the python scripts under Python Windows command line prompt, to reproduce this issue, you can simply do those steps:</p> <ol> <li>start a Python command line prompt(this is usually to hit the Start Menu->Python 2.7->Python(command line). </li> <li><p>type the following text, and hit Enter key.</p> <pre><code>import ctypes </code></pre></li> <li><p>type the following text, and hit Enter key.</p> <pre><code>ctypes.windll.user32.MessageBoxA(0, "Your text", "Your title", 1) </code></pre></li> <li>You will see a message box opened, but this message box window is not activated. </li> <li>Use the mouse to click on the icon of the message box in task bar to activate the message box </li> <li>Close the message box </li> <li><p>type the text again in the Python prompt shell</p> <pre><code>ctypes.windll.user32.MessageBoxA(0, "Your text", "Your title", 1) </code></pre></li> <li>Now, the message box is showed activated (the expected behavior) </li> </ol> <p>So, my question is, why the first message box(window) is not shown active? I originally find this issue when I run a Python pretty printer under GDB command line, because I want to use some python pretty printer to visual the data, like this <a href="https://stackoverflow.com/questions/16227166/gdb-cvmat-python-object-issue-when-debugging-a-c-program">GDB cv::Mat python object issue when debugging a c++ program</a>, I need to show the OpenCV Image window immediately after I type the plot command.</p> <p>But later I found that this is an issue related to Python itself.</p>
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    1. COI don't have time now to figure out how to do this, but have you checked out [the reference](http://msdn.microsoft.com/en-us/library/windows/desktop/ms645505(v=vs.85).aspx) for MessageBoxA? It says there is an option, `MB_SETFOREGROUND` that explicitly sets the dialog to be active. If it weren't modal, you could do it directly with `ctypes.windll.user32.SetForegroundWindow(hwnd)`. I think the `MB_SETFOREGROUND` does exactly that internally. [This page](http://python.net/crew/theller/ctypes/reference.html) might help with figuring out how to set the option.
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