windows api 程序

#include "StdAfx.h" #include<windows.h> #include<mmsystem.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 requiers Windows NT!"),szAppName,MB_ICONERROR); return 0; } hwnd=CreateWindow(szAppName,//window class name TEXT("The Hello Program"),//window caption WS_OVERLAPPEDWINDOW,//window style CW_USEDEFAULT,//INITIAL X POSITION CW_USEDEFAULT,//INITIAL Y position CW_USEDEFAULT,//initial x size CW_USEDEFAULT,//initial y size NULL,//parent window handle NULL, //Window menu handle hinstance,//program instance handle 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 IParam) { 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"),-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,IParam); }

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