Re: convert string base64Binary to byte[]

From:

dom_perron@hotmail.com

Newsgroups:

microsoft.public.vc.mfc

Date:

13 Mar 2007 10:23:23 -0700

Message-ID:

<1173806603.044828.227040@8g2000cwh.googlegroups.com>

On Mar 13, 12:21 pm, MrAsm <m...@usa.com> wrote:

On 13 Mar 2007 08:45:06 -0700, dom_per...@hotmail.com wrote:

Hi,

I have a bitmap stored in a XML document in binary (base64Binary ). I
need to convert this data to byte[] for creating the CBitmap. Here is

[...]

io_rBitmap.SetBitmapBits((DWORD)sizeof(bytes), &bytes);
delete[] bytes;

The image generated is black... Do I have to convert my string in byte
before?

Yes.
You must *decode* the Base64 sequence.

If yes, how can I do this?

You might want to reuse some already written Base64 decoding stuff,
e.g.:

http://www.fourmilab.ch/webtools/base64/http://www.codeproject.com/string/ammimeutils.asphttp://www.codeproject.com/internet/mimecpp.asp

MrAsm

Hi,

Thanks to have answered me so quickly.
Perhaps I miss something but I tried what you suggested to me but I
always have the black image...

strBinImage =
"R0lGODlhOQAwAPUAAAAAAKBggOCgwIAAAMBggMDAwKBAAMCggKDAwMCgwEBAgKCgpP/..."

        //Decode from base64
        CBase64Utils decoder;

        int lenght = strBinImage.GetLength();
        CString strDecoded = decoder.Decode((char*)strBinImage.GetString(),
&lenght);

        BYTE* bytes = new BYTE[strDecoded.GetLength()];

        for (int i = 0; i < strDecoded.GetLength(); i++)
        {
            bytes[i] = (BYTE)strDecoded.GetAt(i);
        }

        io_rBitmap.SetBitmapBits((DWORD)sizeof(bytes), &bytes);

        delete[] bytes;