Hi,

I want to call a (static) native function "DeleteInstance".
These methods looks like in the header-file:
static void DeleteInstance();

and in the cpp-file:
void CMessenger:eleteInstance()
{
if (mpMessenger)
{
delete mpMessenger;
mpMessenger = NULL;
}
}

But I only get this linker error:
===================================
Error 19 error LNK2028: unresolved token (0A000293) "public: static
class MessLib::CMessenger & __cdecl
MessLib::CMessenger:eleteInstance(void)"
(?DeleteInstance@CMessenger@MessLib@@$$FSAAAV12@XZ ) referenced in
function "public: static class DotNetMessLib::Messenger ^ __clrcall
DotNetMessLib::Messenger:eleteInstance(void)"
(?DeleteInstance@Messenger@DotNetMessLib@@$$FSMP$A AV123@XZ) Messenger.obj
===================================
and the (I think resulting) linker error:
Error 20 error LNK2019: unresolved external symbol "public: static void
__cdecl MessLib::CMessenger:eleteInstance(void)"
(?DeleteInstance@CMessenger@MessLib@@$$FSAXXZ) referenced in function
"public: static void __clrcall
DotNetMessLib::Messenger:eleteInstance(void)"
(?DeleteInstance@Messenger@DotNetMessLib@@$$FSMXXZ ) Messenger.obj
===================================

The msdn-help is not really helpful:
"When attempting to import a native function into a pure image,
remember that the implicit calling conventions differ between native
and pure compilations."
But I don't use a pure image. I just compile my wrapper with /clr, not
/clrure.

I've seen that some people get the same problems, but they worked with
preprocessor-macros. The only macros in my code are:
#ifndef _MESSENGER_H_
#define _MESSENGER_H_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

.....
#endif // _MESSENGER_H_

My wrapper code looks like:
void DotNetMessLib::Messenger:eleteInstance()
{
MessLib::CMessenger:eleteInstance();
mpMessenger = nullptr;
}
(in the header-file this method is defined static: static void
DeleteInstance()

To access the classes from the native library I included the native
"messenger.lib" file in my wrapper project settings.

What did I do wrong? How can I avoid these linker errors?

Thanks a lot for your help!

Best regards
Ralf

Try the following statement somewhere in your exe...

#using "messenger.dll"

dave
:-*)


"Ralf" <ralf (AT) abramowitsch (DOT) de> wrote