C++代码创建窗体

#include <windows.h>HWND HMainwnd = NULL; //窗体句柄int run(); //消息循环函数bool InitWindowsApp(HINSTANCE instanceHandle, int show); //窗体初始化函数LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wp, LPARAM lp);//窗体处理回调函数//main函数int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd ){if(!InitWindowsApp(hInstance, nShowCmd))//判断窗体初始化是否成功{return 0;}run(); //初始化成功后循环接收消息return 0;}bool InitWindowsApp(HINSTANCE stanceHandle, int show){WNDCLASS wc; //窗体类结构体wc.style = CS_HREDRAW | CS_VREDRAW; //窗体风格 wc.lpfnWndProc = WndProc; //窗体处理函数wc.cbClsExtra = 0; //窗体类是否由扩展wc.cbWndExtra = 0; //窗体实例是否由扩展wc.hInstance = stanceHandle; //窗体句柄wc.hIcon = LoadIcon(0, IDI_APPLICATION); //窗体图标wc.hCursor = LoadCursor(NULL, IDC_ARROW); //窗体鼠标样式wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //窗体背景颜色wc.lpszMenuName = NULL; //窗体菜单wc.lpszClassName = "BaseWndClass"; //窗体类名if(!RegisterClass(&wc))//判断窗体是否注册成功{MessageBox(0, "注册失败", 0, 0);return false;}//创建窗体HMainwnd = CreateWindow("BaseWndClass", //窗体类名"MyFrom", //窗体标题名WS_OVERLAPPEDWINDOW, //窗体风格CW_USEDEFAULT, CW_USEDEFAULT, //窗体坐标CW_USEDEFAULT,CW_USEDEFAULT, //窗体坐标NULL, //窗体的父窗体NULL, //窗体的子菜单stanceHandle, //窗体句柄NULL); // 如果函数成功，返回值为新窗口的句柄：如果函数失败，返回值为NULLif(HMainwnd == 0)//判断创建窗体是否成功{MessageBox(0, "创建窗体失败", 0, 0);return false;}ShowWindow(HMainwnd, SW_SHOW); //显示窗体UpdateWindow(HMainwnd); //绘制窗体；return true;}LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wp, LPARAM lp){switch(msg)//判断消息的种类{case WM_LBUTTONDOWN: //左键单击MessageBox(0, "Hello World", "myMbox", MB_OK);return 0;case WM_KEYDOWN: //键盘消息if(wp == VK_ESCAPE) //ESC键DestroyWindow(HMainwnd); //销毁窗体return 0;case WM_DESTROY:PostQuitMessage(0); //终止消息return 0;}return DefWindowProc(wnd, msg, wp, lp); //返回缺省消息函数}int run(){MSG msg = {0}; //消息结构BOOL bRet = 1; //获取消息while( (bRet = GetMessage(&msg, 0, 0, 0)) != 0)//消息循环{if(bRet == -1)//判断消息是否接收失败{MessageBox(0, "接受消息失败", 0, 0);break;}else{TranslateMessage(&msg); //转换消息为字符消息DispatchMessage(&msg); //发送消息给窗口}}return (int)msg.wParam;}