Hello everyone,

 I have a window project in C# VS2005 and using P/Invoke to import a dll file from the API c/c++ and have this error message: "Runtime Error R6034, An application has made an attempt to load the C runtime lib incorrectly.  Please contact the application's support team for more information"  So I'm wondering does anyone knows this problem is and how do you solve it?  Thanks

That error is documented here: http://msdn2.microsoft.com/en-us/library/ms235560.aspx

Without knowing more about the DLL and entry point it is hard to give more assistance, other than the general: this could be a conflict between the C runtime loaded by .NET and that loaded by your target DLL.

Thanks rjcox for replying,

 At first, I thought this could be the manifest problem, So I asked the person to re-modified the program and re-built it with the manifest dll, but still I couldn't import or load the dll into my c# project and call one of the function in the dll. I tested the program itself and it works fine but when I imported it into my c# project and it fails because of Runtime Error R6034, An application has made an attempt to load the C runtime lib incorrectly

SergeyK's comment - in your case it is not clear what is going on, but I share my experience with solving that problem...

Microsoft's recommendation is very confusing. That is, it recommends to include a manifest file and to re-compile the project.

I recently had a problem with 'R6034' error message even with a manifest file already included!

In my case, Visual Studio 2005 compiles and builds a DEBUG-configuration of some DLL. But, as soon as I try to start an application that uses that DLL the loader can't load the DLL and displays an error message with error code 'R6034'.

It happened because two Run-Time DLLs were referenced in my DLL by some reason! As soon as I looked inside of my DLL I found two strings: 'msvcr80d.dll' and 'msvcr80.dll', and the 2nd one is the reason of that run-time problem.

In order to resolve the problem I added 'msvcrt.lib' to the list of ignored libraries for DEBUG-configuration:

[Configuration Properties] -> [Linker] -> [Input] -> 'Ignore Specific Library' - msvcrt.lib