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Lesson One

One of the most important things to learn about using the WINAPI to write windows applications is that to do so you have to fill a Windows class structure. The following code will show you how.

Window Procedure

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#include<windows.h>

TCHAR*Simple=TEXT("A Simple Window...");

LRESULTCALLBACKWinProc(HWNDhwnd,UINTMsg,WPARAMwParam,LPARAMlParam)
{
switch(Msg)
{
caseWM_CLOSE:
DestroyWindow(hwnd);
break;
caseWM_DESTROY:
PostQuitMessage(0);
break;
default:
returnDefWindowProc(hwnd,Msg,wParam,lParam);
}
return0;
}

WinMain Function

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intWINAPIWinMain(HINSTANCEhInst,HINSTANCEhPrev,LPSTRlpCmd,intnShow)
{
WNDCLASSwc;
HWNDhwnd;
MSGMsg;

//The WNDCLASS struct wc is filled here by assigning all members of the struct
wc.lpfnWndProc=WinProc;
wc.hInstance=hInst;
wc.style=CS_BYTEALIGNCLIENT;
wc.lpszMenuName=NULL;
wc.lpszClassName=Simple;
wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wc.hCursor=LoadCursor(NULL,IDC_ARROW);
wc.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wc.cbWndExtra=0;wc.cbClsExtra=0;

//end of struct assignments

//Register our newly defined window class
RegisterClass(&wc);

//Create a window from wc class 
hwnd=CreateWindow(Simple,Simple,WS_OVERLAPPEDWINDOW|WS_VISIBLE,
CW_USEDEFAULT,CW_USEDEFAULT,300,210,HWND_DESKTOP,NULL,hInst,NULL);

//Updating the window
UpdateWindow(hwnd);

//The message loop or the place where messages are routed
while(GetMessage(&Msg,NULL,0,0)>0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}

return(int)Msg.wParam;<br>
}