mRes.CreateCompatibleBitmap(dc, w, h); hDC.CreateCompatibleDC(dc); hDC.SelectObject((HBITMAP) mRes); memdc.CreateCompatibleDC(dc); memdc.SelectObject(hbmp); hDC.StretchBlt(0, 0, w, h, &memdc, r.left, r.top, w, h, SRCCOPY); hDC.DeleteDC(); memdc.DeleteDC(); }//DDB转变为DIB，准备保存// DDBToDIB - Creates a DIB from a DDB // bitmap - Device dependent bitmap // dwCompression - Type of compression - see BITMAPINFOHEADER // pPal - Logical palette HANDLE DDBToDIB(CBitmap &bitmap, DWORD dwCompression, CPalette *pPal) { BITMAP bm; BITMAPINFOHEADER bi; LPBITMAPINFOHEADER lpbi; DWORD dwLen; HANDLE hDIB; HANDLE handle; HDC hDC; HPALETTE hPal; ASSERT( bitmap.GetSafeHandle() ); // The function has no arg for bitfields if( dwCompression == BI_BITFIELDS ) return NULL; // If a palette has not been supplied use defaul palette hPal=NULL; if(pPal!=NULL) { hPal = (HPALETTE) pPal->GetSafeHandle(); } if (hPal==NULL) hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE); // Get bitmap information bitmap.GetObject(sizeof(bm),(LPSTR)&bm); // Initialize the bitmapinfoheader bi.biSize = sizeof(BITMAPINFOHEADER); bi.biWidth = bm.bmWidth; bi.biHeight = bm.bmHeight; bi.biPlanes = 1; bi.biBitCount = bm.bmPlanes * bm.bmBitsPixel; bi.biCompression = dwCompression; bi.biSizeImage = 0; bi.biXPelsPerMeter = 0; bi.biYPelsPerMeter = 0; bi.biClrUsed = 0; bi.biClrImportant = 0; // Compute the size of the infoheader and the color table int nColors = (1 << bi.biBitCount); if( nColors > 256 ) nColors = 0; dwLen = bi.biSize + nColors * sizeof(RGBQUAD); // We need a device context to get the DIB from hDC = GetDC(NULL); hPal = SelectPalette(hDC,hPal,FALSE); RealizePalette(hDC); // Allocate enough memory to hold bitmapinfoheader and color table hDIB = GlobalAlloc(GMEM_FIXED,dwLen); if (!hDIB){ SelectPalette(hDC,hPal,FALSE); ReleaseDC(NULL,hDC); return NULL; } lpbi = (LPBITMAPINFOHEADER)hDIB; *lpbi = bi; // Call GetDIBits with a NULL lpBits param, so the device driver // will calculate the biSizeImage field GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight, (LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS); bi = *lpbi; // If the driver did not fill in the biSizeImage field, then compute it // Each scan line of the image is aligned on a DWORD (32bit) boundary if (bi.biSizeImage == 0){ bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8) * bi.biHeight; // If a compression scheme is used the result may infact be larger // Increase the size to account for this. if (dwCompression != BI_RGB) bi.biSizeImage = (bi.biSizeImage * 3) / 2; } // Realloc the buffer so that it can hold all the bits dwLen += bi.biSizeImage; if (handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE)) hDIB = handle; else{ GlobalFree(hDIB); // Reselect the original palette SelectPalette(hDC,hPal,FALSE); ReleaseDC(NULL,hDC); return NULL; } // Get the bitmap bits lpbi = (LPBITMAPINFOHEADER)hDIB; // FINALLY get the DIB BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, // Start scan line (DWORD)bi.biHeight, // # of scan lines (LPBYTE)lpbi // address for bitmap bits + (bi.biSize + nColors * sizeof(RGBQUAD)), (LPBITMAPINFO)lpbi, // address of bitmapinfo (DWORD)DIB_RGB_COLORS); // Use RGB for color table if( !bGotBits ) { GlobalFree(hDIB);
SelectPalette(hDC,hPal,FALSE); ReleaseDC(NULL,hDC); return NULL; } SelectPalette(hDC,hPal,FALSE); ReleaseDC(NULL,hDC); return hDIB; }//保存DIB为位图文件 int SaveBmp(HANDLE hDib, LPSTR filename) { /* BITMAPFILEHEADER bfh; BITMAPINFOHEADER *lpbi=(BITMAPINFOHEADER*)hDib; bfh.bfType=0x4D42; //BM bfh.bfSize=sizeof(bfh)+GlobalSize(hData); bfh.bfReserved1=bfh.bfReserved2=0; int colors=1<lpbi->biBitCount; if(colors>256) colors=0; bfh.bfOffBits=sizeof(bfh)+lpbi->biSize+colors*sizeof(RGBQUAD); HANDLE hFile=CreateFile(filename,GENERIC_WRITE ,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,NULL); if(hFile) { DWORD write; WriteFile(hFile,&bfh,sizeof(bfh),&write,NULL); WriteFile(hFile,lpbi,GlobalSize(hData),&write,NULL); int i=sizeof(hData); CloseHandle(hFile); return true; } return false; */ CFile file; if(!file.Open(filename,CFile::modeCreate|CFile::modeWrite)) return FALSE; BITMAPFILEHEADER bmfHdr; // Header for Bitmap file LPBITMAPINFOHEADER lpBI; // Pointer to DIB info structure DWORD dwDIBSize; if (hDib == NULL) { file.Close(); return FALSE; } /* * Get a pointer to the DIB memory, the first of which contains * a BITMAPINFO structure */ lpBI = (LPBITMAPINFOHEADER) ::GlobalLock((HGLOBAL) hDib); if (lpBI == NULL) { file.Close(); return FALSE; } if (!((*(LPDWORD)(lpBI)) == sizeof(BITMAPINFOHEADER))) { ::GlobalUnlock((HGLOBAL) hDib); file.Close(); return FALSE; // It's an other-style DIB (save not supported) } /* * Fill in the fields of the file header */ /* Fill in file type (first 2 bytes must be "BM" for a bitmap) */ bmfHdr.bfType = ((WORD) ('M' << 8) | 'B'); // "BM" // Calculating the size of the DIB is a bit tricky (if we want to // do it right). The easiest way to do this is to call GlobalSize() // on our global handle, but since the size of our global memory may have // been padded a few bytes, we may end up writing out a few too // many bytes to the file (which may cause problems with some apps). // // So, instead let's calculate the size manually (if we can) // // First, find size of header plus size of color table. Since the // first DWORD in both BITMAPINFOHEADER and BITMAPCOREHEADER conains // the size of the structure, let's use this. dwDIBSize = *(LPDWORD)lpBI + PaletteSize((LPSTR)lpBI); // Partial Calculation // Now calculate the size of the image if ((lpBI->biCompression == BI_RLE8) || (lpBI->biCompression == BI_RLE4)) { // It's an RLE bitmap, we can't calculate size, so trust the // biSizeImage field dwDIBSize += lpBI->biSizeImage; } else { DWORD dwBmBitsSize; // Size of Bitmap Bits only // It's not RLE, so size is Width (DWORD aligned) * Height dwBmBitsSize = WIDTHBYTES((lpBI->biWidth)*((DWORD)lpBI->biBitCount)) * lpBI->biHeight; dwDIBSize += dwBmBitsSize; // Now, since we have calculated the correct size, why don't we // fill in the biSizeImage field (this will fix any .BMP files which // have this field incorrect). lpBI->biSizeImage = dwBmBitsSize; } // Calculate the file size by adding the DIB size to sizeof(BITMAPFILEHEADER) bmfHdr.bfSize = dwDIBSize + sizeof(BITMAPFILEHEADER); bmfHdr.bfReserved1 = 0; bmfHdr.bfReserved2 = 0; /* * Now, calculate the offset the actual bitmap bits will be in * the file -- It's the Bitmap file header plus the DIB header, * plus the size of the color table. */ bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + lpBI->biSize + PaletteSize((LPSTR)lpBI); TRY { // Write the file header file.Write((LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER)); // // Write the DIB header and the bits // file.WriteHuge(lpBI, dwDIBSize); } CATCH (CFileException, e) { ::GlobalUnlock((HGLOBAL) hDib); THROW_LAST(); } END_CATCH ::GlobalUnlock((HGLOBAL) hDib); file.Close(); return TRUE; }简直累死了，行不行啊？？
LoadPictureFromFile(HDC hdc, LPCTSTR szFile, CBitmap *pBitmap, CSize &mSize)
{
// open file
HANDLE hFile = CreateFile(szFile, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
_ASSERTE(INVALID_HANDLE_VALUE != hFile); // get file size
DWORD dwFileSize = GetFileSize(hFile, NULL);
_ASSERTE(-1 != dwFileSize); LPVOID pvData = NULL;
// alloc memory based on file size
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
_ASSERTE(NULL != hGlobal); pvData = GlobalLock(hGlobal);
_ASSERTE(NULL != pvData); DWORD dwBytesRead = 0;
// read file and store in global memory
BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead, NULL);
_ASSERTE(FALSE != bRead);
GlobalUnlock(hGlobal);
CloseHandle(hFile); LPSTREAM pstm = NULL;
// create IStream* from global memory
HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
_ASSERTE(SUCCEEDED(hr) && pstm); // Create IPicture from image file
LPPICTURE gpPicture; hr = ::OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID *)&gpPicture);
_ASSERTE(SUCCEEDED(hr) && gpPicture);
pstm->Release(); OLE_HANDLE m_picHandle;
/*
long hmWidth, hmHeight;
gpPicture->get_Width(&hmWidth);
gpPicture->get_Height(&hmHeight);
int nWidth = MulDiv(hmWidth, GetDeviceCaps(hdc, LOGPIXELSX), HIMETRIC_INCH);
int nHeight = MulDiv(hmHeight, GetDeviceCaps(hdc, LOGPIXELSY), HIMETRIC_INCH);
*/
gpPicture->get_Handle(&m_picHandle);
pBitmap->DeleteObject();
pBitmap->Attach((HGDIOBJ) m_picHandle); BITMAP bm;
GetObject(pBitmap->m_hObject, sizeof(bm), &bm);
mSize.cx = bm.bmWidth; //nWidth;
mSize.cy = bm.bmHeight; //nHeight;
}//截取图象
void CopyBitmap(CDC *dc, CBitmap &mRes, const CBitmap &hbmp, RECT r)
{
if(!hbmp.m_hObject) return;
int w = r.right - r.left,
h = r.bottom - r.top; CDC memdc, hDC;
mRes.CreateCompatibleBitmap(dc, w, h); hDC.CreateCompatibleDC(dc);
hDC.SelectObject((HBITMAP) mRes); memdc.CreateCompatibleDC(dc);
memdc.SelectObject(hbmp); hDC.StretchBlt(0, 0, w, h, &memdc, r.left, r.top, w, h, SRCCOPY);
hDC.DeleteDC();
memdc.DeleteDC();
}//DDB转变为DIB，准备保存// DDBToDIB - Creates a DIB from a DDB
// bitmap - Device dependent bitmap
// dwCompression - Type of compression - see BITMAPINFOHEADER
// pPal - Logical palette
HANDLE DDBToDIB(CBitmap &bitmap, DWORD dwCompression, CPalette *pPal)
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hDIB;
HANDLE handle;
HDC hDC;
HPALETTE hPal;
ASSERT( bitmap.GetSafeHandle() ); // The function has no arg for bitfields
if( dwCompression == BI_BITFIELDS )
return NULL; // If a palette has not been supplied use defaul palette
hPal=NULL;
if(pPal!=NULL)
{
hPal = (HPALETTE) pPal->GetSafeHandle();
}
if (hPal==NULL)
hPal = (HPALETTE) GetStockObject(DEFAULT_PALETTE); // Get bitmap information
bitmap.GetObject(sizeof(bm),(LPSTR)&bm); // Initialize the bitmapinfoheader
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = bm.bmPlanes * bm.bmBitsPixel;
bi.biCompression = dwCompression;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0; // Compute the size of the infoheader and the color table
int nColors = (1 << bi.biBitCount); if( nColors > 256 )
nColors = 0;
dwLen = bi.biSize + nColors * sizeof(RGBQUAD); // We need a device context to get the DIB from
hDC = GetDC(NULL);
hPal = SelectPalette(hDC,hPal,FALSE);
RealizePalette(hDC); // Allocate enough memory to hold bitmapinfoheader and color table
hDIB = GlobalAlloc(GMEM_FIXED,dwLen); if (!hDIB){
SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} lpbi = (LPBITMAPINFOHEADER)hDIB; *lpbi = bi; // Call GetDIBits with a NULL lpBits param, so the device driver
// will calculate the biSizeImage field
GetDIBits(hDC, (HBITMAP)bitmap.GetSafeHandle(), 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)DIB_RGB_COLORS); bi = *lpbi; // If the driver did not fill in the biSizeImage field, then compute it
// Each scan line of the image is aligned on a DWORD (32bit) boundary
if (bi.biSizeImage == 0){
bi.biSizeImage = ((((bi.biWidth * bi.biBitCount) + 31) & ~31) / 8)
* bi.biHeight; // If a compression scheme is used the result may infact be larger
// Increase the size to account for this.
if (dwCompression != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
} // Realloc the buffer so that it can hold all the bits
dwLen += bi.biSizeImage;
if (handle = GlobalReAlloc(hDIB, dwLen, GMEM_MOVEABLE))
hDIB = handle;
else{
GlobalFree(hDIB); // Reselect the original palette
SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} // Get the bitmap bits
lpbi = (LPBITMAPINFOHEADER)hDIB; // FINALLY get the DIB
BOOL bGotBits = GetDIBits( hDC, (HBITMAP)bitmap.GetSafeHandle(),
0L, // Start scan line
(DWORD)bi.biHeight, // # of scan lines
(LPBYTE)lpbi // address for bitmap bits
+ (bi.biSize + nColors * sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbi, // address of bitmapinfo
(DWORD)DIB_RGB_COLORS); // Use RGB for color table if( !bGotBits )
{
GlobalFree(hDIB);
SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return NULL;
} SelectPalette(hDC,hPal,FALSE);
ReleaseDC(NULL,hDC);
return hDIB;
}//保存DIB为位图文件
int SaveBmp(HANDLE hDib, LPSTR filename)
{
/*
BITMAPFILEHEADER bfh;
BITMAPINFOHEADER *lpbi=(BITMAPINFOHEADER*)hDib; bfh.bfType=0x4D42; //BM
bfh.bfSize=sizeof(bfh)+GlobalSize(hData);
bfh.bfReserved1=bfh.bfReserved2=0;
int colors=1<lpbi->biBitCount;
if(colors>256) colors=0;
bfh.bfOffBits=sizeof(bfh)+lpbi->biSize+colors*sizeof(RGBQUAD); HANDLE hFile=CreateFile(filename,GENERIC_WRITE
,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,NULL);
if(hFile)
{
DWORD write;
WriteFile(hFile,&bfh,sizeof(bfh),&write,NULL);
WriteFile(hFile,lpbi,GlobalSize(hData),&write,NULL);
int i=sizeof(hData);
CloseHandle(hFile);
return true;
}
return false;
*/
CFile file;
if(!file.Open(filename,CFile::modeCreate|CFile::modeWrite))
return FALSE; BITMAPFILEHEADER bmfHdr; // Header for Bitmap file
LPBITMAPINFOHEADER lpBI; // Pointer to DIB info structure
DWORD dwDIBSize; if (hDib == NULL)
{
file.Close();
return FALSE;
} /*
* Get a pointer to the DIB memory, the first of which contains
* a BITMAPINFO structure
*/
lpBI = (LPBITMAPINFOHEADER) ::GlobalLock((HGLOBAL) hDib);
if (lpBI == NULL)
{
file.Close();
return FALSE;
} if (!((*(LPDWORD)(lpBI)) == sizeof(BITMAPINFOHEADER)))
{
::GlobalUnlock((HGLOBAL) hDib);
file.Close();
return FALSE; // It's an other-style DIB (save not supported)
} /*
* Fill in the fields of the file header
*/ /* Fill in file type (first 2 bytes must be "BM" for a bitmap) */
bmfHdr.bfType = ((WORD) ('M' << 8) | 'B'); // "BM" // Calculating the size of the DIB is a bit tricky (if we want to
// do it right). The easiest way to do this is to call GlobalSize()
// on our global handle, but since the size of our global memory may have
// been padded a few bytes, we may end up writing out a few too
// many bytes to the file (which may cause problems with some apps).
//
// So, instead let's calculate the size manually (if we can)
//
// First, find size of header plus size of color table. Since the
// first DWORD in both BITMAPINFOHEADER and BITMAPCOREHEADER conains
// the size of the structure, let's use this. dwDIBSize = *(LPDWORD)lpBI + PaletteSize((LPSTR)lpBI); // Partial Calculation // Now calculate the size of the image if ((lpBI->biCompression == BI_RLE8) || (lpBI->biCompression == BI_RLE4))
{
// It's an RLE bitmap, we can't calculate size, so trust the
// biSizeImage field dwDIBSize += lpBI->biSizeImage;
}
else
{
DWORD dwBmBitsSize; // Size of Bitmap Bits only // It's not RLE, so size is Width (DWORD aligned) * Height dwBmBitsSize = WIDTHBYTES((lpBI->biWidth)*((DWORD)lpBI->biBitCount)) * lpBI->biHeight; dwDIBSize += dwBmBitsSize; // Now, since we have calculated the correct size, why don't we
// fill in the biSizeImage field (this will fix any .BMP files which
// have this field incorrect). lpBI->biSizeImage = dwBmBitsSize;
}
// Calculate the file size by adding the DIB size to sizeof(BITMAPFILEHEADER) bmfHdr.bfSize = dwDIBSize + sizeof(BITMAPFILEHEADER);
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0; /*
* Now, calculate the offset the actual bitmap bits will be in
* the file -- It's the Bitmap file header plus the DIB header,
* plus the size of the color table.
*/
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + lpBI->biSize
+ PaletteSize((LPSTR)lpBI);
TRY
{
// Write the file header
file.Write((LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER));
//
// Write the DIB header and the bits
//
file.WriteHuge(lpBI, dwDIBSize);
}
CATCH (CFileException, e)
{
::GlobalUnlock((HGLOBAL) hDib);
THROW_LAST();
}
END_CATCH ::GlobalUnlock((HGLOBAL) hDib);
file.Close();
return TRUE;
}简直累死了，行不行啊？？