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I'm calling functions from a 32-bit unmanaged DLL on a 64-bit system. What I get is:
BadImageFormatException: An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
At first, I had my projects set to the Any CPU platform, so I changed them both to x86, but this error is still occurring. That's really the only fix I know for this.
The DLLs aren't corrupt or anything, because I can use them with other programs (that I don't have the source to). I thought that perhaps it wasn't finding a dependency, but I checked and they're all there. Plus, wouldn't it throw a DllNotFoundException in that case?
What else can I do? And before you say "Use a 64-bit unmanaged DLL instead," let me point out that there isn't one. ;)
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(Exception from HRESULT: 0x8007000B) Print. Solution: This issue arises when there is a 32 bit/64 bit mismatch between the Argon2 DLL and the application that you are using. Basically you will need to ensure that if you are targeting 64 bit you're using the 64 bit binary and vice versa.
Simply right-click on Project > go to Properties > Build > check Prefer 32-bit. You can also use preprocessor conditions, but in this case you need to compile two different assemblies. In other words, compile a 32-bit assembly for 32-bit platforms, and a separate 64-bit assembly for 64-bit platforms.
“An attempt was made to load a program with an incorrect format.” That means that the assembly, which was to be loaded, was in an unexpected format. The format, in this case, refers most likely to the 64-bit build of an application being deployed to IIS, which is being run in 32-bits.
Somehow, the Build checkbox in the Configuration Manager had been unchecked for my executable, so it was still running with the old Any CPU build. After I fixed that, Visual Studio complained that it couldn't debug the assembly, but that was fixed with a restart.
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If you try to run 32-bit applications on IIS 7 (and/or 64-bit OS machine), you will get the same error. So, from the IIS 7, right click on the applications' application pool and go to "advanced settings" and change "Enable 32-Bit Applications" to "TRUE".
Restart your website and it should work.
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