Windows form initial code comment

 

Winmain

  Hellowin. c

  /*  ------------------------------------------------------------------------

Hellowin. c -- displays "Hello, Windows 98! "In client area

(C) Charles Petzold, 1998

-----------------------------------------------------------------------  */  

# Include  <  Windows. h  > 


Lresult callback wndproc (hwnd, uint, wparam, lparam );


  Int  Winapi winmain (hinstance, hinstance hprevinstance,

Pstr szcmdline,  Int  Icmdshow)

{

  Static  Tchar szappname []  =  Text (  "  Hellowin  " );

Hwnd;

MSG;

Wndclass;


Wndclass. Style  =  Cs_hredraw  |  Cs_vredraw;  //  The OR operation combines two window class style identifiers. cs_hredrow is the horizontal direction and cs_vredrow is the vertical direction.  
  
Wndclass. lpfnwndproc  =  Wndproc;  //  Window Message ProcessingProgramAddress 
    ///////////////  Reserved additional space  ///////////////  /  
  Wndclass. cbclsextra  =     0  ;

Wndclass. cbwndextra  =     0  ;
 ////////////////////////////////////  /  
  
Wndclass. hinstance  =  Hinstance;  //  Program Execution entity handle  
  
Wndclass. hicon  =  Loadicon (null, idi_application );  //  Set an icon  
 
Wndclass. hcursor  =  Loadcursor (null, idc_arrow );  //  Set the cursor  
  
Wndclass. hbrbackground  =  (Hbrush) getstockobject (white_brush );  //  Set background color  
  
Wndclass. lpszmenunam  =  NULL; //  Window category menu  
  
Wndclass. lpszclassname  =  Szappname;  //  Name of the window message processing program  
  

  If  (  !  Registerclass (  & Wndclass ))

{

MessageBox (null, text (  "  This program requires Windows NT!  "  ),

Szappname, mb_iconerror );

  Return     0  ;

}

Hwnd  =  Createwindow (szappname,  //  Window class name  
 
Text (  "  The Hello Program  "  ),  //  Window caption  
  
Ws_overlappedwindow,  //  Window Style  
  
Cw_usedefault,  //  Initial X position upper left corner x 
  
Cw_usedefault,  //  Initial y position upper left corner y  
  
Cw_usedefault,  //  Initial x size width  
  
Cw_usedefault,  //  Initial y size height  
  
Null, //  Parent window handle  
  
Null,  //  Window menu handle  
  
Hinstance,  //  Program instance handle  
  
Null );  //  Creation Parameters  
 


Showwindow (hwnd, icmdshow );

Updatewindow (hwnd );



  While  (Getmessage (  &  MSG, null,  0  ,  0  ))

{

Translatemessage (  &  MSG );  //  Translate messages  
 
Dispatchmessage (  &  MSG );  //  Send messages  
  
}

  Return  MSG. wparam;

}

  //  The following is the window message processing program.  
  Lresult callback wndproc (hwnd, uint message, wparam, lparam)

{

HDC;

Paintstruct pS; //  Contains some window message processing procedures, which can be used to update the content of the display area.  
  
Rect;



  Switch  (Message)

{

  Case  Wm_create:

Playsound (text (  "  Hellowin.wav  "  ), Null, snd_filename  |  Snd_async );

  Return    0  ;


  Case  Wm_paint:

HDC  =  Beginpaint (hwnd,  &  PS );



Getclientrect (hwnd,  &  Rect );



Drawtext (HDC, text (  "  Hello, Windows 98!  "  ), -  1  ,  &  Rect,

Dt_singleline  |  Dt_center  |  Dt_vcenter );

Endpaint (hwnd,  &  PS );

  Return     0  ;



  Case Wm_destroy:

Postquitmessage (  0  );

  Return     0  ;

}

  Return  Defwindowproc (hwnd, message, wparam, lparam );

}