Question

I know I can’t compile my C# code using the default ”Platform Target : Any CPU” build setting and call a 32 bit C DLL. But if I change this setting to ”Platform Target : x86” the C# code should run under a 32-bit context and call the C DLL under that 32 bit context right? Although it doesn’t seem to work.

Do I have to register the 32-bit C DLL with some special registry or something?

I am using Windows Server 2003 64 bit.

The error is:

Runtime Error!
[Path to dll]
R6034
An application has made an attempt to load the C runtime library incorrectly.

Answer 1

You are correct. If you re building with the platform set to x86, your 32bit DLL should work fine.

If it s not, here are some things to check:

Make sure the DLL is discoverable. This usually means including it in the same folder as your application s EXE.
Make sure all of the dependencies required by your DLL exist (and are discoverable) on the system. This often means installing the correct VC++ redistributable.
If you re using a 32bit COM component, make sure to register the component on the system.

Edit: After seeing your comment, your issue is due to the DLL not having a proper manifest. If you embed a manifest in the DLL, it should be able to properly resolve the correct C runtime, and load it (provided the correct runtime is installed on the deployment machine.)

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