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<A HREF="read.cgi-read=9931.htm" tppabs="http://www.codeguru.com/mfc_bbs/read.cgi?read=9931">Previous in Thread</A><P ALIGN=CENTER><BIG><BIG><BIG><STRONG>Re: showing a BMP on a dialog</STRONG></BIG></BIG></BIG>
<P ALIGN=CENTER><EM>Posted by <STRONG><A HREF="mailto:bryce@mtf.co.nz">bryce burrows</A></STRONG> on <STRONG>4/21/98 2:14p.m.</STRONG>, in response to <A HREF="read.cgi-read=9931.htm" tppabs="http://www.codeguru.com/mfc_bbs/read.cgi?read=9931">Re: showing a BMP on a dialog</A>, posted by Fei-hong on 4/21/98 2:06a.m.</EM></P>
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<P>hi..all
<BR>here is what i am currently doing but nothing is appearing on my dialog
<BR>i feel i'm missing something realy simple but dont know what to do
<P>any suggestions?
<BR>Bryce
<P>void CBmpshowerDlg::OnOK()
<BR>{
<BR> pPal = new CPalette;
<BR> bool ok = loadBMP("C:\\mrktscrn\\mrktlink.bmp",bitmap,pPal);
<BR> pDc = GetDC();
<BR> if (ok)
<BR> DrawBitmap(pDc,bitmap,pPal);
<BR>}
<P>/* ===========================================*/
<P>bool CBmpshowerDlg::loadBMP(LPCTSTR sBMPFile, CBitmap& bitmap, CPalette *pPal )
<BR>{
<BR> CFile file;
<BR> if( !file.Open( sBMPFile, CFile::modeRead) )
<BR> return FALSE;
<P> BITMAPFILEHEADER bmfHeader;
<P> // Read file header
<BR> if (file.Read((LPSTR)&bmfHeader, sizeof(bmfHeader)) != sizeof(bmfHeader))
<BR> return FALSE;
<P> // File type should be 'BM'
<BR> if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B'))
<BR> return FALSE;
<P> // Get length of the remainder of the file and allocate memory
<BR> DWORD nPackedDIBLen = file.GetLength() - sizeof(BITMAPFILEHEADER);
<BR> HGLOBAL hDIB = ::GlobalAlloc(GMEM_FIXED, nPackedDIBLen);
<BR> if (hDIB == 0)
<BR> return FALSE;
<P> // Read the remainder of the bitmap file.
<BR> if (file.ReadHuge((LPSTR)hDIB, nPackedDIBLen) != nPackedDIBLen )
<BR> {
<BR> ::GlobalFree(hDIB);
<BR> return FALSE;
<BR> }
<P> BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)hDIB ;
<BR> BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;
<P> // If bmiHeader.biClrUsed is zero we have to infer the number
<BR> // of colors from the number of bits used to specify it.
<BR> int nColors = bmiHeader.biClrUsed ? bmiHeader.biClrUsed :
<BR> 1 << bmiHeader.biBitCount;
<P> LPVOID lpDIBBits;
<BR> if( bmInfo.bmiHeader.biBitCount > 8 )
<BR> lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors + bmInfo.bmiHeader.biClrUsed) +
<BR> ((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0));
<BR> else
<BR> lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);
<P> // Create the logical palette
<BR> if( pPal != NULL )
<BR> {
<BR> // Create the palette
<BR> if( nColors <= 256 )
<BR> {
<BR> UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors);
<BR> LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize];
<P> pLP->palVersion = 0x300;
<BR> pLP->palNumEntries = nColors;
<P> for( int i=0; i < nColors; i++)
<BR> {
<BR> pLP->palPalEntry[i].peRed = bmInfo.bmiColors[i].rgbRed;
<BR> pLP->palPalEntry[i].peGreen = bmInfo.bmiColors[i].rgbGreen;
<BR> pLP->palPalEntry[i].peBlue = bmInfo.bmiColors[i].rgbBlue;
<BR> pLP->palPalEntry[i].peFlags = 0;
<BR> }
<P> pPal->CreatePalette( pLP );
<P> delete[] pLP;
<BR> }
<BR> }
<P> CClientDC dc(NULL);
<BR> CPalette* pOldPalette = NULL;
<BR> if( pPal )
<BR> {
<BR> pOldPalette = dc.SelectPalette( pPal, FALSE );
<BR> dc.RealizePalette();
<BR> }
<P> HBITMAP hBmp = CreateDIBitmap( dc.m_hDC, // handle to device context
<BR> &bmiHeader, // pointer to bitmap size and format data
<BR> CBM_INIT, // initialization flag
<BR> lpDIBBits, // pointer to initialization data
<BR> &bmInfo, // pointer to bitmap color-format data
<BR> DIB_RGB_COLORS); // color-data usage
<BR> bitmap.Attach( hBmp );
<P> if( pOldPalette )
<BR> dc.SelectPalette( pOldPalette, FALSE );
<P> ::GlobalFree(hDIB);
<BR> return TRUE;
<BR>}
<P>void CBmpshowerDlg::DrawBitmap(CDC* pDC, CBitmap& bitmap, CPalette *pPal )
<BR>{
<BR> // Create a compatible memory DC
<BR> CDC memDC;
<BR> memDC.CreateCompatibleDC( pDC );
<BR> memDC.SelectObject( &bitmap );
<P> // Select and realize the palette
<BR> if( pPal != NULL && pDC->GetDeviceCaps(RASTERCAPS) & RC_PALETTE )
<BR> {
<BR> pDC->SelectPalette( pPal, FALSE );
<BR> pDC->RealizePalette();
<BR> }
<P> BITMAP bm;
<BR> bitmap.GetBitmap( &bm );
<P> pDC->BitBlt(50, 50, bm.bmWidth, bm.bmHeight, &memDC, 0, 0,SRCCOPY);
<BR> InvalidateRect(NULL);
<BR>}
<BR>
</P>
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