求教：如何写入大型BMP文件，急，送高分

[hzsagile]

我这个函数在写入大型BMP文件（38M)时出错，大型文件该如何处理呢？请高手不吝赐教，高分以报
BOOL CDIB::SaveBMP(CString& csFileName)
{
BITMAPFILEHEADER bFile;
CFile file;
if(!file.Open(csFileName, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary))
{
return FALSE;
}
::ZeroMemory(&bFile,sizeof(bFile));
memcpy((void *)&bFile.bfType,"BM",2);
bFile.bfSize = GetDIBSize() + sizeof(bFile);
bFile.bfOffBits = sizeof(BITMAPINFOHEADER) + GetPaletteSize()*sizeof(RGBQUAD) + sizeof(BITMAPFILEHEADER);
file.Write(&bFile,sizeof(bFile));
file.Write(m_pVoid,GetDIBSize());
file.Close();
return TRUE;

}

[YoungBoz]

BOOL WriteBitmap(hFile,LPSTR lpsz)
DWORD dwByteWriten;
//写入文件头。
fhdr.bfType='MB';
fhdr.bfSize=0;
fhdr.bfOffBits=sizeof(BITMAPFILEHEADER);
fhdr.bfReserved1=0;
fhdr.bfReserved2=0;
if(WriteFile(hFile,&fhdr,sizeo(BITMAPFILEHEADER),&dwByteWriten,NULL)==FALSE)
{
CloseHandle(hFile);
AfxMessageBox(_T("写文件失败!"));
return FALSE;
}

//位图头、写入调色板。
pbminfohdr=LPBITMAPINFOHEADER(lpsz);
int nClrUsed=(pbminfohdr->biClrUsed!=0)?pbminfohdr->biClrUsed:256;
if(WriteFile(hFile,pbminfohdr,sizeof(BITMAPINFOHEADER+nClrUsed*sizeof(RGBQUAD),&dwByteWriten,NULL)==FALSE)
{
CloseHandle(hFile);
AfxMessageBox(_T("写文件失败!"));
return FALSE;
}
int nSizeBitmap=pbminfohdr->biWidht*pbminfohdr->biHeight;
//写入数据位
if(WriteFile(hFile,lpdestbits,nSizeBitmap,&dwByteWriten,NULL)==FALSE || dwByteWriten!=nSizeBitmap)
{
AfxMessageBox(_T("写文件失败!"));
return FALSE;
}
}

[hzsagile]

BOOL CDIB::SaveBMP(CString& csFileName)
{
BITMAPFILEHEADER bFile;
CFile file;
if(!file.Open(csFileName, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary))
{
return FALSE;
}
::ZeroMemory(&bFile,sizeof(bFile));
memcpy((void *)&bFile.bfType,"BM",2);
bFile.bfSize = GetDIBSize() + sizeof(bFile);
bFile.bfOffBits = sizeof(BITMAPINFOHEADER) + GetPaletteSize()*sizeof(RGBQUAD) + sizeof(BITMAPFILEHEADER);
file.Write(&bFile,sizeof(bFile));
file.Write(m_pVoid,GetDIBSize());
file.Close();
return TRUE;

}
我的写入函数是这样的,可是不能写大文件,不知为何

[YoungBoz]

另外Windows在写入大文件时有时会失去响应,建议分批写入.
lpdestbits=LPSTR(pbminfohdr)+sizeof(BITMAPINFOHEADER+nClrUsed*sizeof(RGBQUAD);
i=0
while(nsizeBitmap-i>0x4000)
{
//每次写入0x4000字节
Write(0x4000)
i+=0x4000;
lpdestbits+=0x4000;
}
//写入余下的字节
Write(nSizeBitmap-i)

[hzsagile]

谢谢你的帮助,原来我的函数没问题,是我自己搞错了