Runtime error when calling an unmanaged dll

I've created a GH component that call a method in an unmanaged 32 bits dll :

[System.Security.SuppressUnmanagedCodeSecurity]

[DllImport("MetaCalc.dll")]

public static extern unsafe void CalculateVertexValues(...);

When I run the component in Grasshopper I have a message "trying to load a program with incorrect format" (HRESULT = 0x8007000B).

In Visual Studio 2010 project build is set to x86 only, so I don't think it's a 32/64 bits problem (I use Grasshopper 0.9.0014 with Rhino 5.0 beta x64 on Windows 7)

I tried to use the same method in a C# executable, it runs flawlessly...

Thanks in advance for your help !

Replies to This Discussion

Permalink Reply by Olivier on November 8, 2012 at 8:25am

Some news...

My component runs fine with Rhino 4.0 SR 9, so it seems that Grasshopper 0.9.0014 is compiled for both x86 and x64 but a 32 bits component can't call a 32 bits unmanaged dll in Rhino 5.0 x64.

I can't recompile my dll to x64, is there some code option in C# to define that you want to call a 32 bits method ?

Permalink Reply by Steve Baer on November 8, 2012 at 9:58pm

Hi Olivier,

The operating system won't let you call native 32bit DLLs from a 64bit process. You need to either figure out how to compile your DLL to 64bit or run the 32bit version of Rhino 5.

-Steve

Permalink Reply by Olivier on November 9, 2012 at 11:13am

Thanks Steve, that's what I thought... I can't recompile my dll because I don't have the source code, so I will run my component with the 32 bits version.

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