Loading DLL

Targets Windows
1

I am loading my own dll I wrote but keep getting an error that my function cannot be found. Its something simple right now but I am not sure if I have it set right to expose the function or not. Any c++ experts among us that may be able to point me in the right direction?

My h file looks like:

[code]#ifdef MYDLL_EXPORTS
#define MYDLL_API __declspec(dllexport)
#else
#define MYDLL_API __declspec(dllimport)
#endif

// This class is exported from the MYDLL.dll
class MYDLL_API CMYDLL {
public:
CMYDLL(void);
// TODO: add your methods here.

};

extern MYDLL_API int nMYDLL;

MYDLL_API int __stdcall fnMYDLL(void);

[/code]

I would assume using a soft declare like Soft Declare Function fnMYDLL Lib “MYDLL.dll” As Integer would work right?

Thanks.

2

I would expect it to as long as its located in the right place for a built app

3

It is in the correct place but keeps throwing the function not found error. Was unsure if my code was correct for making the functions available to an outside app like xojo.

Thanks.

4

Not being a Windows guy I’m not certain
You have the DLL Main and all the other normal bits
One thing that’s quite likely not going to work is trying to load a C++ class as the API to the DLL
But there’s only a small snippet of your code so its hard to know why the function isn’t being found

5

Is this line a typo?

extern MYDLL_API int nMYDLL;

Shouldn’t it be

extern MYDLL_API int fnMYDLL;

Also, the Function Not Found is a false error sometimes, it can mean that the DLL just didn’t load for some reason.

6

Nope, not a typo, thats what vs2008 generated when the project was created.

Yes I thought that too but this is everytime so something is amiss.

Thanks for any help.

7

I did just realize I am getting the typical mangling that c++ does to a function. Once I have that resolved then I think it should load correctly then.

8

Right, use a .def file looking like this:

LIBRARY “MYDLL.dll”

EXPORTS
fnMYDLL @ 1

9

Yep, did that and that resolved it. Thanks.