Problem loading my dll with LoadLibrary

[Svavar]

Hi

I'm having problem loading my dll with LoadLibrary. I have got a dll compiled in MSVC 6.0 and when I use that I have no problem loading it with LoadLibrary. Now I am building the dll with MSVC .net and when I try to load the dll I get
error 182 : "The operating system cannot run %1". Also known as ERROR_INVALID_ORDINAL. I have no clue what is wrong. The dll compiles and builds fine but I can't load it. If you have any solutions for me it would be great. I suspect some build parameter but don't know which.

best regards
Svavar

 

[adholioshake]

You could try using

__declspec( dllimport )

for using specific functions/variables within the dll instead of the LoadLibrary function. This would require you to change a few things in your library header file:

/*
   lib.h - Library Header file.
*/

#ifdef DLLEXPORT
  // Export if in library.
  #define DLLAPI __declspec(dllexport)
#else
  // Import if not in library.
  #define DLLAPI __declspec(dllimport)
#endif

// Function prototypes
DLLAPI int LibFunction(void);
// etc...

In your library source file you have to do two things:
1) Define DLLEXPORT before you include your header file.i.e.

#define DLLEXPORT
#include "lib.h" // what your header is called.

2) For all the functions/variables you want to export, type DLLAPI before declaring them. For example:

DLLAPI int LibFunction(void)
{
  // Do something in here
}

3) Recompile the library source and get a DLL (hopefully).

Now, to access any of the functions in the DLL from another C program, you have to #include the library header without defining the DLLEXPORT. This will import all the functions/variables stated in the header. You can call these functions normally from the C program now.

I think this method is probably a better approach as it saves needing to use the GetProcAddress function for calling a function.

 

[Cagliostro]

adholioshake, you can get troubles with this lines of code:
#ifdef DLLEXPORT
// Export if in library.
#define DLLAPI __declspec(dllexport)
#else
// Import if not in library.
#define DLLAPI __declspec(dllimport)
#endif

Imagine you're using this dll from some other dll application. The main idea is to use instead of your DLLEXPORT some MYDLL_IMPL which will be unique for each dll project and define it in the stdafx.h of mydll.

Ion Filipski

 

[adholioshake]

I don't understand what you mean. :-(