Microsoft KB Archive/823071

= FIX: The bool Type Does Not Marshal Correctly from Unmanaged Code =

Article ID: 823071

Article Last Modified on 10/25/2005

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APPLIES TO


 * Microsoft Visual Studio .NET 2003 Academic Edition
 * Microsoft Visual Studio .NET 2003 Enterprise Architect
 * Microsoft Visual Studio .NET 2003 Enterprise Developer
 * Microsoft Visual Studio .NET 2003 Professional Edition

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SYMPTOMS


For a Microsoft Visual Studio .NET 2002 version of this article, see 813488.

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



CAUSE
Sometimes 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.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio .NET 2003 Service Pack that contains this hotfix.

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

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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.

The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version              Size  File name

17-Jun-2003 03:56  13.10.3168.0    2,207,744  C1xx.dll 17-Jun-2003 11:30  13.10.3168.0    1,961,984  Feacp.dll



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

Keywords: kbqfe kbhotfixserver KB823071

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