convert string base64Binary to byte[]

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
a screenshot of my code:

CString strBinImage =
"R0lGODlhOQAwAPUAAAAAAKBggOCgwIAAAMBggMDAwKBAAMCggKDAwMCgwEBAgKCgpP/
78KBAQGCggGBAgAAAAABAgKbK8MDAgMBAAKBgAKDAgAAAQGBggGBAQAAAgEAAQMDcwMBAQKCgwGAAQEBggKBgQKCggMAgAEBAQMBgAEAAgGCgwKBAgGBgQKAAQMBgQOBAAEBgQOCgAP8AAODAAGBgAMDAAMCgAGBAAKCgAEBgAMDgAEBAAMAAQEAgAABAAGCgAAAAAAAAAAAAACH5BAEAAAAALAAAAAA5ADAABQb/
QIBwSCwaj8ikcslsOp/
QqHSaDFCvTsGAgEUWBAWs4XBFgI0JBWDBmCYMDeoC4HgcIZGCZBJdBCgVc1ACFgwKF2FHDxcYAGRODBkUDRQGiU0JAAkaG0sHGhoABRxKAkOUDR0GQ3xKZBgajUwCChoeAB5tRxIfQg
+...

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

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

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

The image generated is black... Do I have to convert my string in byte
before? If yes, how can I do this?

Thanks
Dominique