GetProcAddress fails

[Yours3lf]

Hi,

I'm developing a non-mfc application that uses a dll file (which I made too).
when I try to load the dll file LoadLibrary is successful (does not return NULL), however GetProcAddress fails (returns NULL).

if(hook_setup_func == NULL)

{

  HINSTANCE hook_instance;



  if(((hook_instance = LoadLibrary(_T("hook.dll"))) != NULL) && 

     ((hook_uninstall_func = (hook_uninstall_type)GetProcAddress(hook_instance,"hook_uninstall")) != NULL) && 

     ((hook_install_func = (hook_install_type)GetProcAddress(hook_instance,"hook_install")) != NULL))

  {

    if((hook_setup_func = (hook_setup_type)GetProcAddress(hook_instance,"hook_setup")) == NULL)

    {

      throw std::runtime_error("Couldn't install the hook, case 1");

    }

  }

  else

  {

//this throws error
    throw std::runtime_error("Couldn't install the hook, case 2");

  }

}

here's the corressponding declaration:

typedef void (*hook_setup_type)(HWND, BOOL);
typedef BOOL (*hook_install_type)();
typedef void (*hook_uninstall_type)();
hook_setup_type hook_setup_func;
hook_install_type hook_install_func;
hook_uninstall_type hook_uninstall_func;

and in the dll file:

__declspec(dllexport) void hook_setup(HWND hwnd, BOOL use_the_hook);

__declspec(dllexport) BOOL hook_install();

__declspec(dllexport) void hook_uninstall();

EDIT:
error code is 127

any ideas why it fails?

Best regards,
Yours3!f

[anonymous23323124]

Have you put the DLL lines inside

extern "C" {

}

Otherwise, the symbol names are "scrambled" by the compiler (they have a load of numbers and symbols stuck on depending on return type, etc). Thus they are not called what you expect without the extern "C" bit.

[Yours3lf]

thank you Xander314, extern "C" solved the problem :)