Getting Image Size from SQL Server image field

[Piedtyper]

Help.

I'm trying to customize a ColdFusion custom tag (a specialized dll). The tag pulls binary image information from a SQLServer image field via an ODBC connection and blasts it out to the a file. This all works right now.

What I would like to know is how to get the height and width of the image so I can pass those values back. The data is being read into the variable Data of type UCHAR defined:

UCHAR        Data[BUFFERSIZE];

Just before the data is written to the file I would like to compute the height and width of the image. I assume differing types of images will have different methods of getting the dimensions. Currently the tag doesn't distinguish the image type but just blasts it out to a file. If possible I would like this to work for jpeg and png images.

I'm not sure if this is helpful but here is a snippet of the code that writes the file:

if (cbBinSize > (BUFFERSIZE -1))
   out.Write(Data,BUFFERSIZE-1);
else
   out.Write(Data,cbBinSize );
   retcode = SQLGetData(hstmt1,    // hstmt
   1,           // ipar
   SQL_C_BINARY,   // fCType
   Data,       // rgbValue
   cbBatch,       // cbValueMax
   &cbBinSize);    // pcbValue

Any help is greatly appreciated!