C++/CLI wrapper LNK2028 and LNK2019 error

Question

I need following function (from C++ dll) available in C++/CLI

extern "C" _declspec(dllexport) void __stdcall DestroyInstance(CKeyManagerServerApp *ptr);

My try:

[DllImport("KeyManagerServer.dll", CallingConvention=CallingConvention::StdCall)]
void DestroyInstance(CKeyManagerServerApp IntPtr);

The C++/CLI wrapper is compiled with /clr and stdcall (C++ dll also with stdcall)!

I got following errors:

MKeyManagerInterface.obj : error LNK2028: unresolved token (0A000585) "extern "C" void __stdcall DestroyInstance(class CKeyManagerServerApp *)" (?DestroyInstance@@$$J14YGXPAVCKeyManagerServerApp@@@Z) referenced in function "private: __clrcall MKeyManagerInterface::ManagedKeyInterface::~ManagedKeyInterface(void)" (??1ManagedKeyInterface@MKeyManagerInterface@@$$FA$AAM@XZ)
1>MKeyManagerInterface.obj : error LNK2019: unresolved external symbol "extern "C" void __stdcall DestroyInstance(class CKeyManagerServerApp *)" (?DestroyInstance@@$$J14YGXPAVCKeyManagerServerApp@@@Z) referenced in function "private: __clrcall MKeyManagerInterface::ManagedKeyInterface::~ManagedKeyInterface(void)" (??1ManagedKeyInterface@MKeyManagerInterface@@$$FA$AAM@XZ)
1>..\Debug\Bin\KeyManagerInterfaceD.dll : fatal error LNK1120: 2 unresolved externals

How can I solve this linker errors?

Thx

reuben · Accepted Answer · 2012-07-05 09:46:40Z

2

You shouldn't need to use P/Invoke from C++/CLI. You should be able to include the usual C/C++ header files that declare the imported function. Just make sure to link your C++/CLI assembly against the export library from the native-code DLL that exports the function in question.

answered Jul 5, 2012 at 9:46

reuben

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5 Comments

leon22 Over a year ago

Yes, but if I want to load the library at runtime linking against lib is not suitable!

reuben Over a year ago

@leon22 But you never stated that as a requirement in your post :) Can you just use LoadLibrary + GetProcAddress like unmanaged Windows C/C++ code does?

leon22 Over a year ago

Yes, this was my first idea! But I'm always getting strange memory errors! see: stackoverflow.com/questions/11306602/heap-error-in-c-sharp

reuben Over a year ago

If you've got heap corruption issues, you should work on resolving them regardless of this loading problem. (I also don't understand how LoadLibrary relates to heap corruption.) Perhaps you could try using tools like Application Verifier to help catch heap issues?

leon22 Over a year ago

Thx! It was only an idea! I will try with Application Verifier!

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