dumpbin命令未在dll中列出函数名称

Question

I have a DLL which is develeoped in VB.Net. I am trying to call its functions from my vc++ code. The dll has successfully loaded using LoadLibrary function. But when I try calling any function within the dll, it gives a null pointer exception.

I used the dumpbin command to confirm the function arguments within my dll. But it is not listing any functions. Could it be a problem with the dll or does dumpbin support few dlls only? Please help!

C:\\Program Files (x86)\\Microsoft Visual Studio 11.0>dumpbin ECR.dll Microsoft (R) COFF/PE Dumper Version 11.00.51106.1 Copyright (C) Microsoft Corporation. All rights reserved.

Dump of file ECR.dll

File Type: DLL

Summary

  2000 .reloc 4000 .rsrc 2000 .sdata 16000 .text 

Answer 1

Try writing before any function in your DLL file (header .h files) the name of the project with _API at the end (ECR_API).

for example, lets say we want to create a constructor and destructor for a class called Loader:

class Loader{
    public:
        ECR_API Loader();
        ECR_API ~Loader();
}

also dont forget to add export and import statements at the beggining of your header file:

#ifdef ECR_EXPORTS
#define ECR_API __declspec(dllexport)
#else
#define ECR __declspec(dllimport)
#endif

hope this helps! worked fine for me.