第一个窗口程序

// 16.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
LRESULT CALLBACK WindowProc (HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);

int APIENTRY WinMain(HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR     lpCmdLine,
                    int       nCmdShow)
{
   // TODO: Place code here.
   char szOutBuff[0x80];
   
   //1.定义窗口
   TCHAR className[] = TEXT("第一个应用程序");
   WNDCLASS wndclass = {0};
   wndclass.hbrBackground = (HBRUSH)COLOR_BACKGROUND;
   wndclass.lpszClassName = className ;
   wndclass.hInstance = hInstance;
   wndclass.lpfnWndProc = WindowProc;
   RegisterClass(&wndclass);

   //2.创建并显示窗口
   HWND hwnd = CreateWindow(
       className,
       TEXT("我的第一个窗口"),
       WS_OVERLAPPEDWINDOW,
       100,
       100,
       600,
       300,
       NULL,
       NULL,
       hInstance,
       NULL
       );
   if (hwnd == NULL)
   {
       sprintf(szOutBuff," %x \n",GetLastError());
       OutputDebugString(szOutBuff);
       return 0;
   }
   ShowWindow(hwnd,SW_SHOW);

   MSG msg;
   BOOL bRet;
   while ((bRet = GetMessage(&msg,0,0,0)) != 0)
   {
       if (bRet == -1)
       {
           sprintf(szOutBuff," %x \n",GetLastError());
           OutputDebugString(szOutBuff);
           return 0;
       }
       else
       {
           //TranslateMessage(&msg);//转换消息
           DispatchMessage(&msg);//分发消息
       }
   }

   return 0;
}

LRESULT CALLBACK WindowProc (HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
   return DefWindowProc(hwnd,uMsg,wParam,lParam);
}