Windows 程序设计学习笔记（三）：第一个窗口

/*------------------------------------------------------------------------
HELLOWIN.C -- Displays "Hello, Windows 98!" in client area

(c) Charles Petzold, 1998
-----------------------------------------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("HelloWin");

HWND   hwnd ;
MSG    msg ;
WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra  = 0 ;
wndclass.cbWndExtra = 0;
wndclass.hInstance    = hInstance ;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName= szAppName;

if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT ("This program requires Windows NT!"),szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName ,
TEXT ("The Hello Program"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
);
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);

while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}

return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC  hdc ;
PAINTSTRUCT ps ;
RECT rect ;
switch (message)
{
case WM_CREATE:
PlaySound (TEXT("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect (hwnd, &rect);
DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
EndPaint (hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}

return DefWindowProc (hwnd, message, wParam, lParam) ;

}