Save/Load Image between buffer

kanbang

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4 Mar 2014CPOL

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Save/Load Image between buffer

Given below is a small piece of code to save/load image between buffer:

C++

typedef std::vector<BYTE> vecByte;

bool save_img(const CImage &image, vecByte &buf) 
{
    IStream *stream = NULL;
    HRESULT hr = CreateStreamOnHGlobal(0, TRUE, &stream);
    if( !SUCCEEDED(hr) )
        return false;
    image.Save(stream, Gdiplus::ImageFormatBMP);
    ULARGE_INTEGER liSize;
    IStream_Size(stream, &liSize);
    DWORD len = liSize.LowPart;
    IStream_Reset(stream);
    buf.resize(len);
    IStream_Read(stream, &buf[0], len);
    stream->Release();
    return true;
}

bool load_img(const vecByte &buf, CImage &image)
{
    UINT len = buf.size();
    HGLOBAL hMem = GlobalAlloc(GMEM_FIXED, len);
    BYTE *pmem = (BYTE*)GlobalLock(hMem);
    memcpy(pmem, &buf[0], len);
    IStream    *stream = NULL;
    CreateStreamOnHGlobal(hMem, FALSE, &stream);
    image.Load(stream);
    stream->Release();
    GlobalUnlock(hMem);
    GlobalFree(hMem);
    return true;
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

kanbang

China

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auto image2Memory = [](const CImage& image, vecByte& buf, GUID fileType = Gdiplus::ImageFormatPNG) { bool ret(false); DWORD len = 0; IStream* stream = NULL; HRESULT hr = CreateStreamOnHGlobal(0, TRUE, &stream); if (!SUCCEEDED(hr)) return ret; hr = image.Save(stream, fileType); if (!SUCCEEDED(hr)) goto Finished; ULARGE_INTEGER liSize; hr = IStream_Size(stream, &liSize); if (!SUCCEEDED(hr)) goto Finished; len = liSize.LowPart; hr = IStream_Reset(stream); if (!SUCCEEDED(hr)) goto Finished; buf.resize(len); hr = IStream_Read(stream, &buf[0], len); if (!SUCCEEDED(hr)) goto Finished; ret = true; Finished: if (stream != NULL) { stream->Release(); stream = NULL; } return ret; }; auto memory2Image = [](const vecByte& buf, CImage& image) { bool ret(false); UINT len = buf.size(); HGLOBAL hMem = GlobalAlloc(GMEM_FIXED, len); IStream* stream = NULL; HRESULT hr = ERROR_SUCCESS; if (hMem == NULL) return false; BYTE* pmem = (BYTE*)GlobalLock(hMem); if (pmem == NULL) goto Finished; memcpy(pmem, &buf[0], len); hr = CreateStreamOnHGlobal(hMem, FALSE, &stream); if (FAILED(hr)) goto Finished; hr = image.Load(stream); if (FAILED(hr)) goto Finished; ret = true; Finished: if (stream != NULL) { stream->Release(); stream = NULL; } GlobalUnlock(hMem); GlobalFree(hMem); return ret; };

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Save/Load Image between buffer

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