#include <windows.h>
#include "resource.h"
#include <string>LRESULT CALLBACK MainWndProc(HWND,UINT,WPARAM,LPARAM);//窗口函数的函数原型int APIENTRY WinMain(                               //APIENTRY是__stdcall的宏定义HINSTANCE hInstance,           //本模块的实例句柄HINSTANCE hPrevInstance,       //Win16留下的废物LPSTR lpCmdLine,               //命令行参数int nCmdShow                   //主窗口初始化时的现实形式)
{char szClassName[] = "MainClass";WNDCLASSEX wndclass;   //用来描述主窗口的结构wndclass.cbSize = sizeof(wndclass);  //结构的大小wndclass.style = CS_HREDRAW|CS_VREDRAW; //如果窗口大小，横向改变和竖向改变都会重画窗口wndclass.lpfnWndProc = MainWndProc;//窗口函数指针wndclass.cbClsExtra = 0;//没有额外的类内存wndclass.cbWndExtra = 0;//没有额外的窗口内存wndclass.hInstance = hInstance;//实例句柄wndclass.hIcon = ::LoadIcon(NULL,IDI_APPLICATION);//使用预定义图标wndclass.hCursor = ::LoadCursor(NULL,IDC_ARROW);//使用预定义光标wndclass.hbrBackground = (HBRUSH)::GetStockObject(WHITE_BRUSH);//使用白色背景画刷wndclass.lpszMenuName = (LPSTR)IDR_MENU1;//指定菜单,菜单在头文件中已经定义了wndclass.lpszClassName = szClassName;//窗口类的名称wndclass.hIconSm = NULL;//没有类的小图标::RegisterClassEx(&wndclass);//注册这个窗口类HWND hwnd = ::CreateWindowEx(0,//扩展样式szClassName,//类名"My First Window",//窗口名。标题WS_OVERLAPPEDWINDOW,//窗口风格CW_USEDEFAULT,//初始X坐标CW_USEDEFAULT,//初始Y坐标CW_USEDEFAULT,//宽度CW_USEDEFAULT,//高度NULL,//父窗口句柄NULL,//菜单句柄hInstance,//实例句柄NULL//用户数据);if(hwnd == NULL){::MessageBox(NULL,"创建窗口出错","系统提示",MB_OK);}::ShowWindow(hwnd,nCmdShow);//显示窗口::UpdateWindow(hwnd);//刷新窗口MSG msg;while(::GetMessage(&msg,NULL,0,0)){::TranslateMessage(&msg);//转换为键盘消息::DispatchMessage(&msg);//将消息发送到相应的窗口函数}return msg.wParam;//当GetMessage返回FALSE时程序结束
}LRESULT CALLBACK MainWndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{static std::string str;switch(message){case WM_CREATE:{::SetWindowText(hwnd,"打字程序");return 0;}case WM_CHAR:{str = str+char(wParam);::InvalidateRect(hwnd,NULL,0);//使整个客户区无效,迫使系统再次发送WM_PAINT消息return 0;}case WM_PAINT:{HDC hdc;PAINTSTRUCT ps;hdc = ::BeginPaint(hwnd,&ps);//使无效的客户区变的有效，并取得设备环境句柄::TextOut(hdc,0,0,str.c_str(),str.length());//输出文本::EndPaint(hwnd,&ps);return 0;}case WM_DESTROY:{::PostQuitMessage(0);//向消息队列投递一个WM_QUIT消息，促使GET MESSAGE函数返回0，结束消息循环return 0;}case WM_COMMAND:{switch(LOWORD(wParam)){case ID_FILE_EXIT:::SendMessage(hwnd,WM_CLOSE,0,0);break;}return 0;}}return ::DefWindowProc(hwnd,message,wParam,lParam);
}

resource.h的代码为

//{{NO_DEPENDENCIES}}
// Microsoft Visual C++ generated include file.
// Used by a.rc
//
#define IDR_MENU1                       101
#define ID_FILE_EXIT                    40001// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE        102
#define _APS_NEXT_COMMAND_VALUE         40002
#define _APS_NEXT_CONTROL_VALUE         1001
#define _APS_NEXT_SYMED_VALUE           101
#endif
#endif