MFC视频教学第一课，做一个简单的界面，理解应用程序和操作系统之间的消息传递机制

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

LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);

//WinMain是操作系统调用的，是系统的入口函数
int WINAPI WinMain(
HINSTANCE hInstance,//当前应运程序的实例号
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,//字符串类型的指针，命令行参数
int nCmdShow//程序窗口显示的状态
)
{
//创建一个窗口类
WNDCLASS wndclass;
wndclass.cbClsExtra=0;//为类分配的额外内存，一般置0
wndclass.cbWndExtra=0;//为窗口分配的额外内存，一般置0
wndclass.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);//窗口的背景
wndclass.hCursor=LoadCursor(NULL,IDC_CROSS);//鼠标的类型
wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);//图标的类型
wndclass.hInstance=hInstance;//当前应运程序的实例号
wndclass.lpfnWndProc=WinSunProc;//指向窗口过程函数的指针
wndclass.lpszClassName="Winxin2010";//类的名字
wndclass.lpszMenuName=NULL;//菜单的名字
wndclass.style=CS_HREDRAW | CS_VREDRAW;//窗口特性的组合

//注册一个类
RegisterClass(&wndclass);

//创建一个窗口
HWND hwnd;
hwnd=CreateWindow("Winxin2010","索广宇自学MFC",WS_OVERLAPPEDWINDOW,
100,100,600,400,NULL,NULL,hInstance,NULL);

//显示及更新窗口
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);

//消息循环
MSG msg;
while(GetMessage(&msg,NULL,0,0))//GetMessage()的作用是从消息队列中取出消息
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
switch(uMsg)
{
case WM_CHAR:
char szChar[20];
sprintf(szChar,"char is %d",wParam);
MessageBox(hwnd,szChar,"索广宇加油",MB_OK);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"Mouse Click!","索广宇加油",MB_OK);
HDC hdc;
hdc=GetDC(hwnd);
TextOut(hdc,0,50,"索广宇爱邢飘！",strlen("索广宇爱邢飘！"));
ReleaseDC(hwnd,hdc);
break;
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);
TextOut(hDC,0,0,"执子之手，与子协老！",strlen("执子之手，与子协老！"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"真的要退出吗？","索广宇加油",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}