FIX: SQLGetData() Returns SQL_NO_TOTAL in RFX_LongBinary()

 Last reviewed: September 18, 1997
Article ID: Q132399
The information in this article applies to:
  • The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++ for Windows, version 1.52 - Microsoft Visual C++, 32-bit Edition, versions 2.1, 4.0

SYMPTOMS

An assertion may occur in RFX_LongBinary() if an ODBC driver returns a value of SQL_NO_TOTAL (-4) in the location pointed to by plLength after calling SQLGetData().

CAUSE

The MFC RFX_LongBinary() function assumes that an ODBC driver won't return SQL_NO_TOTAL from SQLGetData(). This is by design.

RESOLUTION

If you must use RFX_LongBinary() to map a binary field to a CLongBinary variable, use the RFX_LongBinary() function in BLOBRFX.EXE. BLOBRFX.EXE, a self-extracting file, contains two files: BLOBRFX.CPP and BLOBRFX.H. BLOBRFX.CPP contains an RFX_LongBinary2() function, which can be used in place of RFX_LongBinary() in your CRecordset's DoFieldExchange() function. BLOBRFX.H contains the prototype for the RFX_LongBinary2() function.

The following file is available for download from the Microsoft Software Library: 

 ~ Blobrfx.exe (size: 18980 bytes)
For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services
NOTE: If you are using a precompiled header in your project, you may want to add the following line of code to the top of BLOBRFX.CPP: 

   #include "stdafx.h"

STATUS

This behavior is by design. This problem was corrected in Visual C++ version 4.2 and above.

REFERENCES

The ODBC Programmer's Reference in the Visual C++ Online Books provides information about SQLGetData().

Additional query words: Oracle
Keywords : MfcDatabase kbfile kbprg
Technology : kbMfc
Version : 1.52 2.1 4.0
Platform : NT WINDOWS
Issue type : kbprb
Solution Type : kbfix

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Last reviewed: September 18, 1997
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