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friend std::ostream& operator << (std::ostream& lhs, const image& rhs)
{
//Create an empty IStream:
IStream* pIStream = nullptr;
HGLOBAL hg=NULL;
if(CreateStreamOnHGlobal(hg, FALSE, (LPSTREAM*)&pIStream)!=S_OK)
DebugText("error on creating an empty IStream");
//choose image format for save it on IStream:
// Get encoder class id for jpg compression
// for other compressions use
// image/bmp
// image/jpeg
// image/gif
// image/tiff
// image/png
CLSID pngClsid;
GetEncoderClsid(L"image/gif", &pngClsid);
// Setup encoder parameters
EncoderParameters encoderParameters;
encoderParameters.Count = 1;
encoderParameters.Parameter[0].Guid = EncoderQuality;
encoderParameters.Parameter[0].Type = EncoderParameterValueTypeLong;
encoderParameters.Parameter[0].NumberOfValues = 1;
// setup compression level
ULONG quality = 50;
encoderParameters.Parameter[0].Value = &quality;
// Save the image to the stream
if(rhs.img->Save(pIStream, &pngClsid, &encoderParameters) != Ok)
{
pIStream->Release();
DebugText("error on saving to IStream");
}
//getting the stream size:
int buffsize=GlobalSize(&hg);
char *pBuff = new char[buffsize];
ULONG ulBytesRead;
//Read the stream to pBuff
if(pIStream->Read(pBuff,buffsize, &ulBytesRead)!=S_OK)
DebugText("error on saving IStream to buffer");
//write the stream size on file
lhs << buffsize;
//write pBuff data on file
lhs << pBuff;
//clean resources
delete pBuff;
pIStream->Release();
return lhs;
}
friend std::istream& operator >> (std::istream& lhs, image& rhs)
{
//getting IStream size:
int streamsize;
lhs.read(reinterpret_cast<char*>(&streamsize), sizeof(streamsize));
IStream* pIStream = nullptr;
// Create stream with 0 size
HGLOBAL hg= ::GlobalAlloc(GMEM_MOVEABLE,streamsize);
GlobalLock(hg);
lhs.read(reinterpret_cast<char*>(&hg),sizeof(streamsize));
GlobalUnlock(hg);
if(CreateStreamOnHGlobal(&hg, TRUE, (LPSTREAM*)&pIStream)!=S_OK)
DebugText("error on creating an empty IStream");
//reading IStream on Image class:
if(rhs.img->FromStream(pIStream,TRUE)!=S_OK)
DebugText("error reading stream to Image");
//realease resources:
pIStream->Release();
GlobalFree(hg);
return lhs;
}
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