windows表單初始代碼注釋

 

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, HINSTANCE hPrevInstance,

                   PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName[] = TEXT ("HelloWin") ;

    HWND   hwnd ;

    MSG    msg ;

    WNDCLASS wndclass ;


   wndclass.style        = CS_HREDRAW | CS_VREDRAW ; //使用或運算結合了兩個視窗類別別樣式標識符， CS_HREDROW 是水平方向 ,CS_VredRow是垂直方向
        
   wndclass.lpfnWndProc  = WndProc ; //視窗訊息處理常式的地址
        ///////////////預留額外空間////////////////
    wndclass.cbClsExtra   = 0 ;

    wndclass.cbWndExtra   = 0 ;
/////////////////////////////////////
        
    wndclass.hInstance    = hInstance ;//程式執行實體控制代碼
        
    wndclass.hIcon        = LoadIcon (NULL, IDI_APPLICATION) ; //設定一個表徵圖
        
  wndclass.hCursor      = LoadCursor (NULL, IDC_ARROW) ;//設定游標
        
   wndclass.hbrBackground= (HBRUSH) GetStockObject (WHITE_BRUSH) ;//設定背景色
        
  wndclass.lpszMenuNam  = NULL ;//視窗類別別菜單
        
    wndclass.lpszClassName= szAppName ;//視窗訊息處理常式的名稱
        

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 左上方x
        
                   CW_USEDEFAULT,// initial y position 左上方y
        
                   CW_USEDEFAULT,// initial x size  寬度
        
                   CW_USEDEFAULT,// initial y size 高度
        
                   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) ;  //翻譯訊息
        
          DispatchMessage (&msg) ; //傳送訊息
        
    }

return msg.wParam ;

}

//以下是視窗訊息處理常式
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    HDC                   hdc ;

    PAINTSTRUCT ps ;  //包含一些視窗訊息處理程式序，可以用來更新顯示地區的內容。
        
    RECT          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) ;

}