FIX: The bool Type Does Not Marshal Correctly from Unmanaged Code to Managed Code (813488)

Microsoft Visual Studio .NET (2002), Professional Edition

Microsoft Visual Studio .NET (2002), Enterprise Architect Edition

Microsoft Visual Studio .NET (2002), Enterprise Developer Edition

Microsoft Visual Studio .NET (2002), Academic Edition

For a Microsoft Visual Studio .NET 2003 version of this article, see 823071.

SYMPTOMS

When you call unmanaged code that returns a bool type value of false from managed code, the return value may appear as true.

CAUSE

In some cases, the native bool type does not marshal correctly from unmanaged code to managed code.

WORKAROUND

There are two ways to work around this issue:

Change existing native DLLs to use BOOL return types instead of bool.
Use DllImport and the platform invoke services to call to the unmanaged DLL.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

Note You must have a Visual Studio license agreement to obtain this hotfix.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

   Date         Time   Version      Size       File name
   -----------------------------------------------------
   23-Jan-2003  01:27  13.0.9658.0  2,105,344  C1xx.dll
   23-Jan-2003  01:28  13.0.9658.0  1,753,088  C2.dll

Modification Type:

Minor

Last Reviewed:

10/21/2005

Keywords:

kbHotfixServer kbQFE kbprb KB813488