LNK1005: symbol already defined (DLL import)

Hello,

after days of searching, I couldn't find my problem anywhere else, so i hope you can help me with it.

I am trying to import a DLL like this:



Read.h:

Code:

#define _WIN32_DCOM		

#define USING_WRAPPER_CLASS
#include "dll.h"
class ReadData
{...
}

dll.h:

Code:

#if 1

#ifdef USING_WRAPPER_CLASS
#import "Read.dll" no_namespace named_guids
#else

#import "Read.dll" no_namespace, raw_interfaces_only,\
                   raw_native_types, named_guids
#endif

#else

#include "Read.tlh"

#endif

void CheckHRESULT(HRESULT hr, char* str = NULL)
{
	if( SUCCEEDED(hr) ){
		if( str )printf("%s\n\r",str);
		else printf("Success!\n\r");
	}
	else printf("Failed...(0x%08X)\n\r",hr);
}

Read.cpp:

Code:

#include "ReadData.h"

ReadData::ReadData(void)
{...
}

So far it works fine, but when I am going to include the Read.h in some other *.cpp file, I get the Linker-Error mentioned above.

I hope I explained the problem enough, I really dont know how to solve it.

Why do you have code in a .h file?