Q253317: BUG: Using #import with ADO Causes C4146 Warning in Visual C++

Article: Q253317
Product(s): Microsoft C Compiler
Version(s): WINDOWS:2.5,2.6; winnt:6.0
Operating System(s): 
Keyword(s): kbVC kbVC600bug kbGrpDSVCDB kbGrpDSMDAC kbDSupport kbADO250bug kbADO260bug kbATM kbado2
Last Modified: 23-AUG-2001

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The information in this article applies to:

- Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 
- Microsoft Visual C++, 32-bit Professional Edition, version 6.0 
- Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
- ActiveX Data Objects (ADO), versions 2.5, 2.6, 2.7 
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SYMPTOMS
========

When you compile an ActiveX Data Objects (ADO) application in Visual C++ 6.0
using the #import directive with version 2.5 or 2.6 of Msado15.dll, you may
receive the following warning:

  warning C4146: unary minus operator applied to unsigned type, result still
  unsigned

RESOLUTION
==========

Although this problem will most likely have no effect on your application, you
can suppress the warning with the following code:

  #pragma warning(push)
  #pragma warning(disable:4146)
  #import "c:\program files\common files\system\ado\MSADO15.DLL" 
  #pragma warning(pop)

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.


MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

Save the following code as a .cpp file, and then compile and run the program with
Visual C++. Accept the default workspace when prompted.

  #import "C:\Program Files\Common Files\SYSTEM\ADO\MSADO15.DLL" rename_namespace("ado20")
  using namespace ado20;
  #include <iostream>
  using namespace std;
  void main ()
  {
      cout <<" You should see the warning in compiler's debug window"<<endl;
  }


Additional query words:

======================================================================
Keywords          : kbVC kbVC600bug kbGrpDSVCDB kbGrpDSMDAC kbDSupport kbADO250bug kbADO260bug kbATM kbado270 
Technology        : kbVCsearch kbAudDeveloper kbADOsearch kbADO250 kbADO260 kbVC600 kbVC32bitSearch kbADO270
Version           : WINDOWS:2.5,2.6; winnt:6.0
Issue type        : kbbug
Solution Type     : kbpending

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