位图操作高手请进！！！！！！

Question

最基本的方法，自己填充文件结构，比如，
如果m_hDib是你的句柄
LPBITMAPINFOHEADER lpBI;
BITMAPFILEHEADER bmfHdr;
lpBI = (LPBITMAPINFOHEADER)GlobalLock(m_hDib);
bmfHdr.bfType = DIB_HEADER_MARKER;dwDIBSize = *(LPDWORD)lpBI + PaletteSize((LPBYTE)lpBI);if((lpBI->biCompression == BI_RLE8)||(lpBI->biCompression == BI_RLE4))
   dwDIBSize += lpBI->biSizeImage;
else
{
DWORD dwBmBitsSize;
dwBmBitsSize = WIDTHBYTES((lpBI->biWidth)*((DWORD)lpBI->biBitCount*lpBI->biHeight;
dwDIBSize += dwBmBitsSize;
lpBI->biSizeImage;
}bmfHdr.bfSize = dwDIBSize + sizeof(BITMAPFILEHEADER);
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + lpBI->biSize + PaletteSize((LPBYTE)lpBI);TRY
{
pFile->Write(&bmfHdr,sizeof(BITMAPFILEHEADER));
//write DIB buffer;
pFile->WriteHuge(lpBI,dwDIBSize);
}
CATCH(CException, e)
{
GlobalUnlock(m_hDib);
return FALSE;
}END_CATCHGlobalUnlock(m_hDib);

Answer 1

你是不是老谢呀，这个函数我已经写好了。在8b、16b、24b、32b下调试通过。
用法：
CBitmap cBitmap;
cBitmap.LoadBitmap(IDB_BITMAP2);
SaveToBmp(cBitmap,"d:\\test.bmp");
#include "math.h"
BOOL SaveToBmp(HBITMAP hBitmap,const char *szBmpFile)
{
BITMAP bm;
PBITMAPINFO bmpInf;
BOOL bRet=FALSE;
int nPaletteSize=0; if(GetObject(hBitmap,sizeof(bm),&bm)==0)
return FALSE; if(bm.bmBitsPixel<16)
nPaletteSize=pow(2,bm.bmBitsPixel); bmpInf=(PBITMAPINFO)LocalAlloc(LPTR,sizeof(BITMAPINFOHEADER)+
sizeof(RGBQUAD)*nPaletteSize);

if(bmpInf==NULL)
{
return FALSE;
}

//-----------------------------------------------
bmpInf->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInf->bmiHeader.biWidth = bm.bmWidth;
bmpInf->bmiHeader.biHeight = bm.bmHeight;
bmpInf->bmiHeader.biPlanes = bm.bmPlanes;
bmpInf->bmiHeader.biBitCount = bm.bmBitsPixel;
bmpInf->bmiHeader.biCompression = BI_RGB;
bmpInf->bmiHeader.biSizeImage = (bm.bmWidth+7)/8*bm.bmHeight*bm.bmBitsPixel;
bmpInf->bmiHeader.biXPelsPerMeter = 0;
bmpInf->bmiHeader.biYPelsPerMeter = 0;
bmpInf->bmiHeader.biClrUsed = 0;
bmpInf->bmiHeader.biClrImportant = 0;
//-----------------------------------------------

void* buf=(void*) new char[bmpInf->bmiHeader.biSizeImage];
if(buf==NULL)
{
LocalFree(bmpInf);
return FALSE;
}

if(!::GetDIBits(GetWindowDC(NULL),hBitmap,0,(WORD)bm.bmHeight,buf,bmpInf,DIB_RGB_COLORS))
{
delete []buf;
LocalFree(bmpInf);
return FALSE;
}


BITMAPFILEHEADER bmFHeader;
bmFHeader.bfType=0x4d42;
bmFHeader.bfReserved1=0;
bmFHeader.bfReserved2=0;
bmFHeader.bfOffBits=(DWORD)(sizeof(BITMAPFILEHEADER)+bmpInf->bmiHeader.biSize+
nPaletteSize*sizeof(RGBQUAD));

bmFHeader.bfSize=(DWORD)(bmFHeader.bfOffBits+bmpInf->bmiHeader.biSizeImage); DWORD dwTemp;
HANDLE hFile;
hFile=CreateFile(szBmpFile,GENERIC_READ|GENERIC_WRITE,0,NULL,CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,NULL);

while(hFile!=INVALID_HANDLE_VALUE)
{
//写BITMAPFILEHEADER
if(WriteFile(hFile,&bmFHeader,sizeof(BITMAPFILEHEADER),&dwTemp,NULL)==0)
break;

//写BITMAPINFOHEADER
if(WriteFile(hFile,&bmpInf->bmiHeader,bmpInf->bmiHeader.biSize,&dwTemp,NULL)==0)
break

//写调色板数据(可能有)
if(WriteFile(hFile,&bmpInf->bmiColors,nPaletteSize*sizeof(RGBQUAD),&dwTemp,NULL)==0)
break; //写图像数据
DWORD dwLen=bmpInf->bmiHeader.biSizeImage;
BYTE *pTemp=(BYTE*)buf;
while(dwLen>=65535)
{
if(WriteFile(hFile,pTemp,65535,&dwTemp,NULL)==0)
{
dwLen=0xffffffff;
break;
}
dwLen-=65535;
pTemp+=65535;
}

if(dwLen==0xffffffff)
break; if((dwLen>0)&&(WriteFile(hFile,pTemp,dwLen,&dwTemp,NULL)==0))
break; bRet=TRUE; break;//必须的
}

if(hFile!=INVALID_HANDLE_VALUE)
{
CloseHandle(hFile);
} delete []buf;
LocalFree(bmpInf);
return bRet;
}