WinMain函数

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


LRESULT CALLBACK WinSunProc(
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,           // command line
  int nCmdShow                    // show state
  )
{
    //设计一个窗口类
    WNDCLASS wndcls;
    wndcls.cbClsExtra=0;
    wndcls.cbWndExtra=0;
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor=LoadCursor(NULL,IDC_ARROW);
    wndcls.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wndcls.hInstance=hInstance;     //应用程序实例句柄由WinMain函数传进来
    wndcls.lpfnWndProc=WinSunProc;
    wndcls.lpszClassName="sunxin2006";
    wndcls.lpszMenuName="jermmy";
    wndcls.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    //创建窗口，定义一个变量用来保存成功创建窗口后返回的句柄
    HWND hwnd;
    hwnd=CreateWindow("sunxin2006","edit by Jermmy",
WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,600,400,NULL,NULL,hInstance,NULL);

    //显示及刷新窗口
    ShowWindow(hwnd,SW_SHOWNORMAL);
    UpdateWindow(hwnd);

    //定义消息结构体，开始消息循环
    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}


//编写窗口过程函数
LRESULT CALLBACK WinSunProc(
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 code is %d",wParam);
        MessageBox(hwnd,szChar,"char",0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","message",0);
        HDC hdc;
        hdc=GetDC(hwnd);        //不能在响应WM_PAINT消息时调用
        TextOut(hdc,0,50,"程序员之家",strlen("程序员之家"));
        //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,"This is Jermmy's first Windows program.",strlen("This is Jermmy's first Windows program.!"));
        EndPaint(hwnd,&ps);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(hwnd,"是否真的结束？","message",MB_YESNO))
        {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}