BUG: You receive the C4146 warning when you use #import with ActiveX Data Objects (ADO) 2.5 or later (253317)

The information in this article applies to:

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

This article was previously published under Q253317

SYMPTOMS

When you compile an ActiveX Data Objects (ADO) application in Visual C++ 6.0 by 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 that this is a bug in the Microsoft products that are listed in the "Applies to" section.

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;
}

Modification Type:	Major	Last Reviewed:	4/21/2005
Keywords:	kbtshoot kbBug kbpending KB253317 kbAudDeveloper