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I have a DLL written in C in source code. This is the code for the General Polygon Clipper (in case you are interested). I'm using it in a C# project via the C# wrapper provided on the homepage. This comes with a precompiled DLL.
Since switching to a 64bit Development machine with Visual Studio 2010 and Windows 7 64 bit, the application won't run anymore. This is the error I get:
An attempt was made to load a program with an incorrect format.
This is because of DLLImporting the 32bit gpc.dll, as I have gathered from stuff found on the web.
I assume this will all go away if I recompile the DLL to 64bit, but can't for the love of me figure out how to do so. My C skills are basic, in that I can write a C program with the GNU tools, but have no experience with various compilers / processors / IDEs etc.
I believe I could port this to C#. By that I mean I trust myself to actually pull it off. But I'd prefer not to, since it is a lot of work that I'd prefer a compiler to do for me ;)
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Choose the Configuration Manager button to open the Configuration Manager dialog box. In the Active Solution Platform drop-down list, select the <New...> option to open the New Solution Platform dialog box. In the Type or select the new platform drop-down list, select a 64-bit target platform.
Solution. You cannot call a 64-bit DLL from 32-bit LabVIEW. This is a limitation of 64-bit Windows, which does not support mixed 64-bit/32-bit processes. The recommended solution is to recompile the DLL from the source code for a 32-bit target architecture.
Open the 32-bit project in Visual Studio 2008. In the file menu, click Build and select Configuration Manager. Pull down the drop-down under “Active solution platform” which currently displays “Win32” and select New. In the drop-down for “Type or select the new platform”, select “x64”.
It could be as easy as creating a new platform:
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