exception - C++ Access Violation while calling dll function -

I'm actually using an unmanaged C ++ DLL, and I have .h, .cpp or .lib Do not have access to, but only for DLL

After using the PE Explorer and to find the function I wanted to use, here is what I get:

  @ Tdtm_Dossier @ logon $ qv; Index 1310; Unmangled Borland C ++ function: Qualified function Tdtm_Dossier :: Logon ()  

And here's what I get by using the dumpbin :

< Pre> 1310 11F 9 00105234 @ TDMDesier @ logon $ qv

The exception is here:

  in functions on 0x034b258c (modDll.dll) Unconfirmed Exception CPP.XA: wrx access violation to 0xC0000005: 0x000000AC  

I am using this function to call and use, follow this type:

  #include & lt; Stdio.h & gt; # Include & lt; Windows.h & gt; # Include & lt; Iostream & gt; Typingfaces (* logon) (); Int main () {HMODULE modDll; Ent Funnel Logon; ModDll = Load Library ("C: \\ dll \\ modDll.dll"); Logon logon; Logon = (Logon) GetProcAddress (modDll, "@ Tdtm_Dossier @ Logon $ qv"); If (logon) {resultLogon = logon (); // & lt; - This is where I get the exception printf ("the function is loaded \ n"); } Else // TODO: Error Message FreeLibrary (modDll); }  

Since the DLL documentation does not give me any interesting information about using the function, so I can not trust it

DLL Loading correctly and GetProcAddress returns something I think (but I'm not sure) that this is something to do with my typedef , but I do not know What is the return type of this function can be.