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POUse ShutdownBlockRequestCreate in Win32 Console application
 

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  1. POUse ShutdownBlockRequestCreate in Win32 Console application
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    <p><strong>What is the proper method of blocking premature termination of a Win32 Console Application running on Windows 7?</strong></p> <p>When Vista was introduced, there were changes regarding how <a href="http://msdn.microsoft.com/en-us/library/ms700677%28v=vs.85%29.aspx" rel="nofollow">Application Shutdown</a> happened. Contrary to the behavior in XP, which was to open up a UI requesting whether the user wants to force close or not, Windows Vista (and 7) terminates the process if nothing is done programmatically to prevent it. Console apps and applications without a top level window visible must also use the new function <a href="http://msdn.microsoft.com/en-us/library/aa376877%28v=VS.85%29.aspx" rel="nofollow">ShutdownBlockRequestCreate</a> to provide a reason for Vista to show in the UI that pops up or it will terminate the program after 5 seconds anyway.</p> <p>Below is my attempt at using the ShutdownBlockRequestCreate function in a Win32 Console application; the precompiled header option was removed from the project after creation by the wizard. I get the error code of 5, corresponding to ERROR_ACCESS_DENIED, whenever I use the function. This is apparently (according to the <a href="http://msdn.microsoft.com/en-us/library/ms700677%28v=vs.85%29.aspx" rel="nofollow">Application Shutdown link</a>) because I am not calling the function from the same thread as was used to create the window (the console window).</p> <pre><code>#include &lt;iostream&gt; #include &lt;tchar.h&gt; #include &lt;conio.h&gt; #include &lt;windows.h&gt; typedef BOOL (WINAPI *SBRCREATEFUNC)(HWND,LPCWSTR); void RegisterShutdownBlockReason() { SBRCREATEFUNC ShutdownBlockReasonCreate; HWND hWnd = GetForegroundWindow(); HINSTANCE hinstLib = LoadLibrary(TEXT("user32.dll")); if (hinstLib != NULL) { ShutdownBlockReasonCreate = (SBRCREATEFUNC) GetProcAddress(hinstLib,"ShutdownBlockReasonCreate"); if(ShutdownBlockReasonCreate != NULL) { if(!(ShutdownBlockReasonCreate) (hWnd, L"Terminating Communication Sessions")) { printf("\nfailed To Register Reason, failure code: %d\n", GetLastError()); } else { printf("\nRegistered Reason\n"); } } else { printf("\nCouldn't load ShutdownBlockReasonCreate procedure\n"); } } else { printf("\nFailed to LoadLibrary(\"user32.dll\")\n"); } } int _tmain(int argc, _TCHAR* argv[]) { RegisterShutdownBlockReason(); printf("Type to terminate program.\n"); getch(); return 0; }; </code></pre>
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