第一个Windows程序

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK winhehepro(
HWND hwnd,      // handle to window
UINT uMsg,      // message identifier
WPARAM wParam,  // first message parameter
LPARAM lParam   // second message parameter
);

int WINAPI WinMain(
HINSTANCE hInstance,  // handle to current instance
HINSTANCE hPrevInstance,  // handle to previous instance
LPSTR lpCmdLine,      // pointer to command line
int nCmdShow          // show state of window
)
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=winhehepro;
wndcls.lpszClassName="hehe";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW|CS_VREDRAW;
RegisterClass(&wndcls);

HWND hwnd;//创建窗口
hwnd=CreateWindow(
"hehe",  // pointer to registered class name
"Jarily", // pointer to window name
WS_OVERLAPPEDWINDOW,        // window style
0,                // horizontal position of window
0,                // vertical position of window
600,           // window width
400,          // window height
NULL,      // handle to parent or owner window
NULL,          // handle to menu or child-window identifier
hInstance,     // handle to application instance
NULL        // pointer to window-creation data
);

ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);

MSG msg;//消息循环
//while(GetMessage(&msg,hwnd,0,0))
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
//return 0;
}

LRESULT CALLBACK winhehepro(
HWND hwnd,      // handle to window
UINT uMsg,      // message identifier
WPARAM wParam,  // first message parameter
LPARAM lParam   // second message parameter
)
{
switch(uMsg)
{
case WM_CHAR:
char szChar[20];
sprintf(szChar,"char is %d",wParam);
MessageBox(hwnd,szChar,"xixi",0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"left button is checked","xixi",0);
HDC hdc;
hdc=GetDC(hwnd);//不能在响应WM_PAINT消息时调用
TextOut(hdc,0,50,"Hello World!",strlen("Hello World!"));
ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);//BeginPaint只能在响应WM_PAINT消息时调用
TextOut(hDC,0,0,"hehe and xixi!",strlen("hehe and xixi!"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"是否真的退出窗口?","iloveyou",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}