How to retrive PDF Binary data from sqlserver

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C++

Dear All,

How to retrive PDF Binary data from sqlserver and save to PDF file using VC++ ?

our code is:

qry="select document from  emptable where empno=1"; //document is image datatype
crs->Open(CRecordset::snapshot,qry,CRecordset::readOnly|CRecordset::executeDirect);

                 while(!crs->IsEOF())
		    {
			crs->GetFieldValue("document",strDocument);
						
		     }

we have retrive binary data using CString but when we write this data into a PDF file it is NOT working.

we think the problem is CString So without CString how can we do.
Please give to us your suggestions.

Thank you,
raju.