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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
©2005-©2007 Microsoft Corporation. All rights reserved. Terms of Use | Trademarks




Article ID: 949625 - Last Review: February 23, 2008 - Revision: 1.2

BadImage Format Exception

Source: Microsoft Support

RAPID PUBLISHING

RAPID PUBLISHING ARTICLES PROVIDE INFORMATION DIRECTLY FROM WITHIN THE MICROSOFT SUPPORT ORGANIZATION. THE INFORMATION CONTAINED HEREIN IS CREATED IN RESPONSE TO EMERGING OR UNIQUE TOPICS, OR IS INTENDED SUPPLEMENT OTHER KNOWLEDGE BASE INFORMATION.

Action



A .NET 2.0 C# application refers to a 32-bit unmanaged dll. The application is built using C# on Visual Studio 2005 with the “AnyCpu” platform setting. 

Result

The application runs fine on 32-bit machine but when it is launched on a 64-bit machine, it throws a BadImageFormatException.



"Unknown exception error hresult:0x8007000B,” which maps to BadImageFormatException.

Cause



In this case, the managed C# application is not a pure managed application because it refers to a 32-bit unmanaged or native dll. 

The 'AnyCpu' switch has the following results:

- A 32-bit process on a 32 bit machine
- A 64-bit process on a 64 bit machine 

A 32-bit dll cannot be loaded in a 64-bit process or vice-versa.  Hence, when an application running in a 64-bit process tries to load a 32 bit dll, it fails with BadImageFormatException.  Simillarly, when an application running in a 32-bit process tries to load a 64-bit dll, it fails with a BadImageFormatException.

Resolution

When a managed application refers to a native cpu or platform specific dll, it should not be build using the ‘AnyCpu’ switch. 

DISCLAIMER

MICROSOFT AND/OR ITS SUPPLIERS MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY, RELIABILITY OR ACCURACY OF THE INFORMATION CONTAINED IN THE DOCUMENTS AND RELATED GRAPHICS PUBLISHED ON THIS WEBSITE (THE “MATERIALS”) FOR ANY PURPOSE. THE MATERIALS MAY INCLUDE TECHNICAL INACCURACIES OR TYPOGRAPHICAL ERRORS AND MAY BE REVISED AT ANY TIME WITHOUT NOTICE.

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APPLIES TO
  • Microsoft .NET Framework 1.0
  • Microsoft .NET Framework 1.0 Service Pack 3
  • Microsoft .NET Framework 1.1
  • Microsoft .NET Framework 1.1 Service Pack 1
  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 2.0 IA64 Edition
  • Microsoft .NET Framework 2.0 Software Development Kit
  • Microsoft .NET Framework 2.0 x64 Edition
  • Microsoft .NET Framework 3.0
  • Microsoft .NET Framework 3.5
Keywords: 
kbnomt kbrapidpub kbmbsdevelopmenttools KB949625
       

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