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RE: [Dev-C++] WinAPP
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From: Damien A <g_...@ho...> - 2003-12-25 21:02:32
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<P><BR><BR></P></DIV>
<DIV></DIV>>From: "Noorez Kassam" <COO...@HO...>
<DIV></DIV>>To: dev...@li...
<DIV></DIV>>Subject: [Dev-C++] WinAPP
<DIV></DIV>>Date: Wed, 24 Dec 2003 14:11:53 -0700
<DIV></DIV>
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<DIV></DIV>>My windows APP is closing before i see any results! It complies fine
<DIV></DIV>>but it just closes
<DIV></DIV>>
<DIV></DIV>
<DIV></DIV>> WNDCLASSEX wndClass;
<DIV></DIV>>
<DIV></DIV>> //register class
<DIV></DIV>> wndClass.style = 0;
<DIV></DIV>> wndClass.lpfnWndProc = WindowProc;
<DIV></DIV>> wndClass. cbClsExtra = 0;
<DIV></DIV>> wndClass.hInstance = hInstance;
<DIV></DIV>> wndClass.hIcon = LoadIcon( hInstance, szAppName);
<DIV></DIV>> wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
<DIV></DIV>> wndClass.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
<DIV></DIV>> wndClass.lpszMenuName = NULL;
<DIV></DIV>> wndClass.lpszClassName = szAppName;
<DIV></DIV>> wndClass.hIconSm = wndClass.hIcon;
<DIV></DIV>>
<DIV></DIV>
<DIV></DIV>
<P>Hmm, do you have a resource file that actually has the specified icon? But anyways, the reason your app fails is because RegisterClassEx returns 0. The reason for this prolly were: cbWndExtra was not initialized, and more importantly: cbSize was not initialized/set to the size of the WNDCLASSEX structure. </P>
<P>I changed your code to this:</P>
<P>WNDCLASSEX wndClass = {0}; </P>
<P>//register class <BR>wndClass.style = CS_OWNDC; // A habit I picked up from OpenGL<BR>wndClass.lpfnWndProc = WindowProc; </P>
<P>wndClass.hInstance = hInstance; <BR>wndClass.hIcon = LoadIcon( NULL, IDI_WINLOGO); //A standard windows icon<BR>wndClass.hCursor = LoadCursor(NULL, IDC_ARROW); <BR>wndClass.hbrBackground = (HBRUSH) COLOR_BACKGROUND; <BR>wndClass.lpszMenuName = NULL; <BR>wndClass.lpszClassName = szAppName; <BR>wndClass.hIconSm = wndClass.hIcon; <BR>wndClass.cbSize = sizeof(WNDCLASSEX); //Important field</P>
<P>and it worked ;).</P>
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