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VC中使用GDI+在内存转换图片类型
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详细代码如下：
BOOL MBmpToMImage(CMemFile& cbfBmp, CMemFile& cbfImage, CString strType)
{
int iBmpSize = cbfBmp.GetLength();
HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, iBmpSize);
if (hMemBmp == NULL) return FALSE;
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);
if (pStmBmp == NULL)
{
GlobalFree(hMemBmp);
return FALSE;
}
BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);
cbfBmp.SeekToBegin();
cbfBmp.Read(pbyBmp, iBmpSize);
Image* imImage = NULL;
imImage = Image::FromStream(pStmBmp, FALSE);
if (imImage == NULL)
{
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
return FALSE;
}
USES_CONVERSION;
CLSID clImageClsid;
GetImageCLSID(A2W("image/"+strType.GetBuffer(0)), &clImageClsid);
HGLOBAL hMemImage = GlobalAlloc(GMEM_MOVEABLE, 0);
if (hMemImage == NULL)
{
pStmBmp-Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
if (imImage != NULL) delete imImage;
return FALSE;
}
IStream* pStmImage = NULL;
CreateStreamOnHGlobal(hMemImage, TRUE, &pStmImage);
if (pStmImage == NULL)
{
pStmBmp-Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage
return FALSE;
}
imImage-Save(pStmImage, &clJpgClsid);
if (pStmImage == NULL)
{
pStmBmp-Release();
pStmImageRelease();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage;
if (imImage != NULL) delete imImage;
return FALSE;
}
LARGE_INTEGER liBegin = {0};
pStmImage-Seek(liBegin, STREAM_SEEK_SET, NULL);
BYTE* pbyImage = (BYTE *)GlobalLock(hMemImage);
cbfImage.SeekToBegin();
cbfImage.Write(pbyImage, GlobalSize(hMemImage));
if (imImage != NULL) delete imImage;
pStmBmp-Release();
pStmImage-Release();
GlobalUnlock(hMemBmp);
GlobalUnlock(hMemImage);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
return TRUE;
}
来源:http://www.tulaoshi.com/n/20160219/1622920.html
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