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

//声明回调函数
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

//主函数 程序入口
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT ("HelloWin") ;
	HWND         hwnd ;        //用来保存成功创建窗口后返回的句柄
    MSG          msg ;         //定义消息结构体变量
    WNDCLASS     wndclass ;    //窗体类

    wndclass.style         = CS_HREDRAW | CS_VREDRAW ; //指定窗口风格
    wndclass.lpfnWndProc   = WndProc ; ////函数指针，指向处理窗口消息的函数入口
    wndclass.cbClsExtra    = 0 ;       //结构体后附加的字节数，一般总为0
    wndclass.cbWndExtra    = 0 ;       //窗体实例附加的字节数，一般总为0
    wndclass.hInstance     = hInstance ;                          //模块句柄
    wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;   //图标句柄 任务栏显示的图标
    wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;       //光标句柄
	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH); //背景颜色COLOR_BACKGROUND
    wndclass.lpszMenuName  = NULL ;      //菜单名的字符串
    wndclass.lpszClassName = szAppName ; //自定义类名，不要与其他类名重复

	if (!RegisterClass (&wndclass))
    {
        MessageBox (NULL, TEXT ("注册类失败!"), szAppName, MB_ICONERROR) ;
        return 0 ;
    }

	int x =((GetSystemMetrics(SM_CXSCREEN)/2)-200); //x居中
	int y =((GetSystemMetrics(SM_CYSCREEN)/2)-200); //y居中

	//创建窗体API
	hwnd = CreateWindow(szAppName,TEXT("毕业设计"),WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX,x,y,400,400,NULL,NULL,hInstance,NULL);
	//显示窗体的API 传入需要显示的窗体句柄和显示方式
	ShowWindow(hwnd,iCmdShow);
	//刷新窗体的API
	UpdateWindow(hwnd);

	//从系统的应用程序线程消息队列中取得一个消息
	while(GetMessage(&msg,NULL,0,0) > 0)
	{
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     HDC			 hdc;             //句柄
     PAINTSTRUCT	 ps;
     RECT			 rect;            //矩形
	 HINSTANCE       hInstance;       //窗口实例
	 static HWND     hwndButton[2];   //按钮句柄
     
     switch (message)
     {        
	 case WM_CREATE: //创建按钮
		 {
			hInstance = ((LPCREATESTRUCT)lParam)->hInstance;
			//按钮1
			hwndButton[0] = CreateWindow("BUTTON","训练",      
				WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  
				10,10,100,100,hwnd,NULL,
				(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);
			//按钮2
			hwndButton[1] = CreateWindow("BUTTON","获取",      
				WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  
				10,250,100,100,hwnd,NULL,
				(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE), NULL);
			return 0;
		 }
	 case WM_PAINT: //绘制文字
		 hdc = BeginPaint(hwnd,&ps);
		 GetClientRect(hwnd,&rect);
		 DrawText(hdc,TEXT("By:Eastmount CSDN制作"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
		 EndPaint(hwnd,&ps);
		 return 0;
	 case WM_COMMAND: //响应按钮消息
		 if((HWND)lParam == hwndButton[0])
		 {
			 MessageBox(NULL,TEXT("是否训练图片?"),TEXT("提示"),MB_YESNO|MB_ICONQUESTION);
		 }
		 if((HWND)lParam == hwndButton[1])
		 {
			MessageBox(NULL,TEXT("是否获取图片?"),TEXT("提示"),MB_YESNO|MB_ICONQUESTION);
		 }
		 return 0;
	 case WM_CLOSE: //关闭
		 if(IDYES==MessageBox(hwnd,"是否关闭程序?","提示",MB_YESNO|MB_ICONQUESTION))
		 {
			 DestroyWindow (hwnd);   
		 }
		 return 0;
	 case WM_DESTROY: //退出程序
		 PostQuitMessage (0) ;
		 return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}

        程序运行结果如下图所示:
 
        其中主要涉及到的函数原型如下所示:

//创建窗体
hwnd = CreateWindow (
	szClassName,         /* Classname */
	"Windows App",       /* Title Text */
	WS_OVERLAPPEDWINDOW, /* default window */
	CW_USEDEFAULT,       /* Windows decides the position */
	CW_USEDEFAULT,       /* where the window ends up on the screen */
	544,                 /* The programs width */
	375,                 /* and height in pixels */
	HWND_DESKTOP,        /* The window is a child-window to desktop */
	NULL,                /* No menu */
	hThisInstance,       /* Program Instance handler */
	NULL                 /* No Window Creation data */
);
//创建按钮
hwndButton = CreateWindow( 
	"BUTTON",   // predefined class 
	"OK",       // button text 
	WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  // styles  
	10,         // starting x position 
	10,         // starting y position 
	100,        // button width 
	100,        // button height 
	hwnd,       // parent window 
	NULL,       // No menu 
	(HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE), 
	NULL        // pointer not needed 
);