Get Icon and save it into a png file

This is not a news to get a icon from a file. But how about the process? I can extrace the process image file name and use it to extract the icons that it contains. The output is a handle of HICON. I survey many articles to find out the solution. Finally, I found a solution to the saving issue. The following sample codes will show the GDI+ and save the HICON into a PNG file. Of course, you can save it into other format that GDI+ provided.

 

HICON GetFileIcon(const CString& strFileName, CString& strSaveFileName, bool bSmallIcon) {

    SHFILEINFO sfi;

    SHGetFileInfo((LPCTSTR)strFileName,

        FILE_ATTRIBUTE_NORMAL,

        &sfi,

        sizeof(SHFILEINFO),

        SHGFI_ICON | SHGFI_USEFILEATTRIBUTES | (bSmallIcon ? SHGFI_SMALLICON : SHGFI_LARGEICON));

    if(sfi.hIcon) {

        Bitmap* pBitmap = Bitmap::FromHICON(sfi.hIcon);

        CLSID encoderClsid;

        GetEncoderClsid(L"image/png", &encoderClsid);

        CStringW strPngFileName;

#ifndef _UNICODE

        strPngFileName.Format(L"%S", strFileName.GetString());

#else

        strPngFileName = strFileName;

#endif

        int nStart = strPngFileName.ReverseFind('\\') + 1;

        int nEnd = strPngFileName.ReverseFind('.');

        int nLength = nEnd - nStart;

        strPngFileName = strPngFileName.Mid(nStart, nLength);

        strPngFileName = CStringW(L"C:\\") + strPngFileName + (bSmallIcon ? CStringW("Small.png") : CStringW("Large.png"));

        strSaveFileName = strPngFileName;

        pBitmap->Save(strPngFileName.GetString(), &encoderClsid, NULL);

    }

    return sfi.hIcon;

}

 

You should include the header file <gdiplus.h> and use the name space "GdiPlus".