P/Invoke problem in migrating 32 bit to 64bit application!

[TaiZhong]

I have an application that calls win32 Dlls in c# with P/Invoke. The application works fine in the 32-bit window XP. When I migrate it to the 64-bit window XP( virtual machine ), the application fail to load win32 DLLs and with an error message of {"An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)"}. Anyone know whats the problem and how to solve this problem. Any help is appreciated. Thanks.

[Mike Dimmick]

You cannot load 32-bit DLLs in a 64-bit process. If you want to run your .NET program on a 64-bit machine but cannot provide 64-bit versions of native DLLs it uses, you should force it to run in a 32-bit process. (You will obviously lose the address-space benefits of running in a 64-bit process.) To do this, change the Platform Target property on the Build tab of Project Properties from 'Any CPU' (the default) to 'x86'. You may want to consider generating a separate configuration for your project. Go to Build, Configuration Manager and in the Active Solution Platform drop-list, select <New...>. Then select 'x86' from the 'select new platform' drop-list and click OK.

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