Th? no: Lm th? no ? s? d?ng LoadImage() ? ?c m?t t?p tin BMP

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ID c?a bi: 158898 - Xem s?n ph?m m bi ny p d?ng vo.
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TM T?T

Cc LoadImage API c th? ?c s? d?ng ? t?i m?t ?nh bitmap t? m?t t?p tin BMP. Tuy nhin, n khng ph?i tr? v? b?ng thng tin. Bi vi?t ny cung c?p m?u m? v m t? lm th? no ? l?y thng tin b?ng cho bitmap v?i LoadImage.

THNG TIN THM

Sau m? s? d?ng cc LoadImage API ? t?i bitmap nh m?t DIBSection, v sau t?o ra m?t b?ng mu t? b?ng mu c?a DIBSection. N?u khng c b?ng mu l hi?n nay, m?t b?ng mu ?nh bn s?c ?c s? d?ng:
   BOOL LoadBitmapFromBMPFile( LPTSTR szFileName, HBITMAP *phBitmap,
   HPALETTE *phPalette )
   {

   BITMAP  bm;

   *phBitmap = NULL;
   *phPalette = NULL;

   // Use LoadImage() to get the image loaded into a DIBSection
   *phBitmap = (HBITMAP)LoadImage( NULL, szFileName, IMAGE_BITMAP, 0, 0,
               LR_CREATEDIBSECTION | LR_DEFAULTSIZE | LR_LOADFROMFILE );
   if( *phBitmap == NULL )
     return FALSE;

   // Get the color depth of the DIBSection
   GetObject(*phBitmap, sizeof(BITMAP), &bm );
   // If the DIBSection is 256 color or less, it has a color table
   if( ( bm.bmBitsPixel * bm.bmPlanes ) <= 8 )
   {
   HDC           hMemDC;
   HBITMAP       hOldBitmap;
   RGBQUAD       rgb[256];
   LPLOGPALETTE  pLogPal;
   WORD          i;

   // Create a memory DC and select the DIBSection into it
   hMemDC = CreateCompatibleDC( NULL );
   hOldBitmap = (HBITMAP)SelectObject( hMemDC, *phBitmap );
   // Get the DIBSection's color table
   GetDIBColorTable( hMemDC, 0, 256, rgb );
   // Create a palette from the color tabl
   pLogPal = (LOGPALETTE *)malloc( sizeof(LOGPALETTE) + (256*sizeof(PALETTEENTRY)) );
   pLogPal->palVersion = 0x300;
   pLogPal->palNumEntries = 256;
   for(i=0;i<256;i++)
   {
     pLogPal->palPalEntry[i].peRed = rgb[i].rgbRed;
     pLogPal->palPalEntry[i].peGreen = rgb[i].rgbGreen;
     pLogPal->palPalEntry[i].peBlue = rgb[i].rgbBlue;
     pLogPal->palPalEntry[i].peFlags = 0;
   }
   *phPalette = CreatePalette( pLogPal );
   // Clean up
   free( pLogPal );
   SelectObject( hMemDC, hOldBitmap );
   DeleteDC( hMemDC );
   }
   else   // It has no color table, so use a halftone palette
   {
   HDC    hRefDC;

   hRefDC = GetDC( NULL );
   *phPalette = CreateHalftonePalette( hRefDC );
   ReleaseDC( NULL, hRefDC );
   }
   return TRUE;

   }
				
M? sau y ch?ng t? lm th? no ? s? d?ng cc LoadBitmapFromBMPFilech?c nng:
   case WM_PAINT:
   {
     PAINTSTRUCT   ps;
     HBITMAP       hBitmap, hOldBitmap;
     HPALETTE      hPalette, hOldPalette;
     HDC           hDC, hMemDC;
     BITMAP        bm;

   hDC = BeginPaint( hWnd, &ps );

   if( LoadBitmapFromBMPFile( szFileName, &hBitmap, &hPalette ) )
   {
      GetObject( hBitmap, sizeof(BITMAP), &bm );
      hMemDC = CreateCompatibleDC( hDC );
      hOldBitmap = (HBITMAP)SelectObject( hMemDC, hBitmap );
      hOldPalette = SelectPalette( hDC, hPalette, FALSE );
      RealizePalette( hDC );

      BitBlt( hDC, 0, 0, bm.bmWidth, bm.bmHeight,
              hMemDC, 0, 0, SRCCOPY );

      SelectObject( hMemDC, hOldBitmap );
      DeleteObject( hBitmap );
      SelectPalette( hDC, hOldPalette, FALSE );
      DeleteObject( hPalette );
   }
   EndPaint( hWnd, &amp;ps );

   }
   break;
				

Thu?c tnh

ID c?a bi: 158898 - L?n xem xt sau cng: 18 Thang Tam 2011 - Xem xt l?i: 2.0
p d?ng
  • Microsoft Win32 Application Programming Interface, khi ?c dng v?i:
    • Microsoft Windows NT Server 4.0 Standard Edition
    • Microsoft Windows NT Workstation 4.0 Developer Edition
    • Microsoft Windows 95
T? kha:
kbcode kbFAQ kbhowto kbmt KB158898 KbMtvi
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