Create a simple window program

Source: Internet
Author: User

function prototypes for #include  <windows.h>/* window functions */lresult callback mainwndproc (hwnd, uint,  Wparam, lparam); Int apientry winmain (hinstance hinstance, hinstance  Hprevinstance, lpstr lpcmdline, int ncmdshow) {    char  szclassname[] =  "Mainwclass";    wndclassex wndclass;         /* fills the wndclassex structure with the parameters describing the main window */    wndclass.cbsize =  sizeof (WNDCLASS); the size of the              /* structure */ = CS_HREDRAW | CS_VREDRAW;        /* specifies that if the size changes, redraw */    wndclass.lpfnwndproc = mainwndproc;              /* window function Pointer */     Wndclass.cbclsextra = 0;                         /* no additional class memory */    wndclass.cbwndextra = 0;                          /* no additional window memory */    wndclass.hinstance = hinstance;                  /* instance handle */     wndclass.hicon = loadicon (null, idi_application);/* Use predefined icons */     wndclass.hcursor = loadcursor (null, idc_arrow);   /* Use predefined Cursors */     wndclass.hbrBackground =  (Hbrush) getstockobject (White_brush)  /* using a white background brush */     wndclass.lpszMenuName = NULL;                    /* do not specify a menu */    wndclass.lpszclassname = szclassname;            /* the name of the window class */&NBSP;&NBSP;&NBSP;&NBSP;WNDCLASS.HICONSM  = NULL;                         /* Small icons with no class */         /* Register this window */    registerclassex (&wndclass);         /* Creating the main window */    hwnd hwnd = createwindowex (         0,                          /*dwExStyle,  Extended Style */         szClassName,                /*lpclassname,  class name */         "my first window!",         /*lpWindowName,  title */         WS_OVERLAPPEDWINDOW,       /*dwStyle,  window Style */         CW_USEDEFAULT,              /*X,  initial X-coordinate */        cw_usedefault,              /*Y,  initial Y-coordinate */         CW_USEDEFAULT,              /*nwidth, Width */        cw_usedefault,              /*nHeight,  Height */         NULL,                       /*hWndParent,  parent Window Handle */        null,                        /*hMenu,  Menu Handle */        hinstance,                  /*hInstance,  Program Instance handle */         null);                        /*lpParam,  User Data */         if (hwnd == null)     {         messagebox (null,  "error build the window!",  " Error ", &NBSP;MB_OK);        return -1;    }         /* display window, Refresh window client area */    showwindow (hwnd, ncmdshow);     updatewindow (HWND);         /* remove the message from the message queue and give it to the window function processing, Returns false directly to GetMessage, ending the message loop */    msg msg;    while (GetMessage ( &msg, null, 0, 0))     {         /* Convert keyboard message */        translatemessage (&AMP;MSG);         /* sends the message to the appropriate window function */        dispatchmessage (& msg);     }        /* when GetMessage returns FALSE, the program ends */     return msg.wparam;} Lresult callback mainwndproc (Hwnd hwnd, uint message, wparam wparam,  lparam lparam) {    char sztext[] =  "The simplest window program! ";     switch (message)     {         case wm_paint:  /* window client area need to redraw */        {             HDC hdc;             PAINTSTRUCT ps;                         /* makes the invalid client area effective, and get the device environment handle */            hdc = beginpaint ( HWND,&NBSP;&AMP;PS);             /* display text */             textout (Hdc, 10, 10, sztext,  strlen (Sztext));    &Nbsp;        endpaint (HWND,&NBSP;&AMP;PS);             return 0;         }        case wm_destroy: /* is destroying the window */             /* post a WM_QUIT message to the message queue, prompting the GetMessage function to return 0, ending the message loop */             postquitmessage (0);             return 0;    }    /* Handing out messages we don't handle to the system to do the default processing */    return defwindowproc (hwnd, message, wparam,  LParam);}

Create a simple window program

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