WIN32 创建窗口 WNDCLASS 和CreateWindow

 

#include "StdAfx.h"
//#include <windows.h>
#include <stdio.h>

//先定义回调函数
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
)
{
    //窗口结构
    WNDCLASS wndcls;
    wndcls.style=CS_HREDRAW | CS_VREDRAW;                        //窗口类型
    wndcls.lpfnWndProc=WinSunProc;                                //回调函数，接受窗口消息并处理
    wndcls.cbClsExtra=0;
    wndcls.cbWndExtra=0;
    wndcls.hInstance=hInstance;                                    //程序运行时传进来的Imagebase
    wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);                        //左上角图标
    wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);                    //鼠标类型
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);    //背景色
    wndcls.lpszMenuName=NULL;                                    //菜单名
    wndcls.lpszClassName="ganxiang2020";                        //窗口名字


    //注册窗口
    int ret = RegisterClass(&wndcls);
    //创建窗口
    HWND hwnd;
    hwnd=CreateWindow("ganxiang2020","我的第一个窗口",WS_OVERLAPPEDWINDOW,
        0,0,600,400,NULL,NULL,hInstance,NULL);
    //显示窗口
    ShowWindow(hwnd,SW_SHOWNORMAL);
    //更新窗口
    UpdateWindow(hwnd);
    //消息循环
    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}
//回调函数实现
LRESULT CALLBACK WinSunProc(
                            HWND hwnd,      // handle to window
                            UINT uMsg,      // message identifier
                            WPARAM wParam,  // first message parameter
                            LPARAM lParam   // second message parameter
                            )
{
    switch(uMsg)
    {
    //接受键盘按键时
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar,"char code is %d",wParam);
        MessageBox(hwnd,szChar,"char",0);
        break;
    //鼠标左键
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","message",0);
        HDC hdc;
        hdc=GetDC(hwnd);
        TextOut(hdc,0,50,"鼠标左键点击了！",strlen("鼠标左键点击了！"));
        //ReleaseDC(hwnd,hdc);
        break;
    //窗口最大化最小化还原传递消息
    case WM_SIZE:
         char s[50];
         sprintf(s,"%d -- %d\n",wParam,lParam);
        OutputDebugString(s);
        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,0,0,"http://www.sunxin.org",strlen("http://www.sunxin.org"));
        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;
    //其他情况交给系统默认处理
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);
    }
    return 0;
}