We can get the BYTEs of the CImage object by Image2Bytes API, and get the CImage object from the BYTEs by Bytes2Image API.

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 bool Image2Bytes(const CImage& img, BYTE** bytes, size_t& byteSize){
	if(img.isNull()) return false;
	IStream* pStrImg = NULL;
	if(CreateStreamOnHGlobal(NULL, TRUE, &pStrImg) != S_OK) return false;
	img.Save(pStrImg, Gdiplus::ImageFormatBMP);
	HGLOBAL hGlobalImg = NULL;
	GetHGlobalFromStream(pStrImg, &hGlobalImg);
	BYTE* pBits = (BYTE*)GlobalLock(hGlobalImg);
	byteSize = GlobalSize(pBits);
	*bytes = new BYTE[byteSize];
	memcpy(*bytes, pBits, byteSize);
	GlobalUnlock(hGlobalImg);
	PstrImg->Release();
	GlobalFree(hGloabalImg);
	return true;
}
 
bool Bytes2Image(const BYTE* bytes, const size_t byteSize, CImage& img){
	if(bytes == NULL) return false;
	HGLOBAL hGlobalImg = GlobalAlloc(GMEM_MOVEABLE, byteSize);
	BYTE* pBits = (BYTE*)GlobalLock(hGlobalImg);
	memcpy(pBits, bytes, byteSize);
	GlobalUnlock(hGlobalImg);
	IStream* pStrImg = NULL;
	if(CreateStreamOnHGlobal(hGlobalImg, TRUE, &pStrImg) != S_OK){
		GlobalFree(hGloabalImg);
		return false;
	}
	if(!img.isNull()) img.Destroy();
	img.Load(pStrImg);
	pStrImg->Release();
	GlobalFree(hGloabalImg);
	return true;
}