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Q120045: BUG: Value of cbDSN in SQLConnect is Not Mapped Correctly

Article: Q120045
Product(s): Open Database Connectivity (ODBC)
Version(s): WINDOWS:2.0
Operating System(s): 
Keyword(s): kbBug kbISS
Last Modified: 27-JUL-2001

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The information in this article applies to:

- Microsoft Open Database Connectivity, version 2.0 
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BUG# ODBCSDK2: 2693 (2.0)

SYMPTOMS
========

When connecting from a 16-bit application to a certain 32-bit driver in a
Microsoft Windows NT environment, you may receive an error from the driver about
incorrect parameter or argument value. This does not happen when SQLConnect is
called from a 32-bit application to a 32-bit driver or from a 16-bit application
to a 16-bit driver.

For example, assume that the datasource name is "DsnName" with cbDSN=8. Then, the
following calls show the behavior:

     //Allocate environment handle
        SQLAllocEnv(phenv);
     //Allocate connection handle
        SQLAllocConnect(henv,phdbc);
     //Specify szDSN="DsnName" and cbDSN= length of ("DsnName")=8
        SQLConnect(hdbc,"DsnName",8,szUID,cbUID,szAuthStr,cbAuthStr);

In looking at the ODBC trace using 32-bit ODBC Spy, you will find that the value
of cbDSN passed is not 8, but a large number (0x3a43).

CAUSE
=====

When connecting from a 16-bit application to a 32-bit driver, the value of cbDSN
in SQLConnect is not correctly passed and is mapped to a large value. However,
the values of cbUID and cbAuthStr are passed correctly.

STATUS
======

Microsoft has confirmed this to be a problem in ODBC Driver Manager version 2.0.
We are researching this problem and will post new information here in the
Microsoft Knowledge Base as it becomes available.

Additional query words: ODBC MSVC DM invalid 14915

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Keywords          : kbBug kbISS 
Technology        : kbAudDeveloper kbODBCSearch kbODBC200
Version           : WINDOWS:2.0
Issue type        : kbbug

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