problem in using win32 DLL in c#   

hi ,everyone ,please check my codes,i am really confused.

the codes of win32 dll is as follows:
***********************the win32 DLL writen in c++*****************


extern "C"
{
__declspec(dllexport) WCHAR*  __stdcall getWNameOfComponnet();

}

WCHAR name[100];

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
    return TRUE;
}


WCHAR*  getWNameOfComponnet(){
	return name;
}

************************************************
*********************the win32 .def file************

EXPORT
getWNameOfComponnet  @1
*****************************************************


and I try to use the export in c#,but I can not get anything from
getprocaddress(,.)

**************import the prototype of api**
[DllImport ("kernel32.dll",EntryPoint="LoadLibraryW",
CharSet=CharSet.Unicode,CallingConvention=CallingConvention.StdCall,
SetLastError =true)]
public extern static IntPtr   LoadLibrary(String  lpFileName);

[DllImport("Kernel32", EntryPoint = "GetProcAddress",
CharSet=CharSet.Unicode ,CallingConvention =
CallingConvention.StdCall,
SetLastError = true)]
 public extern static IntPtr  GetProcAddress(
            IntPtr handle,
            [MarshalAs(UnmanagedType.LPWStr)]string funcname);

**********************
**************get the export from my dll***
public delegate string getwname();

        private static Delegate GetAddress(IntPtr  dllModule, string
functionname, Type t)
        {

            IntPtr  addr = GetProcAddress(dllModule, functionname);
//addr is always zero.why?

            if (addr == IntPtr.Zero )
                return null;
            else
                return Marshal.GetDelegateForFunctionPointer(addr, t);
        }

        public String callGetWname()
        {
            IntPtr  huser32 =IntPtr.Zero ;
            huser32 = LoadLibrary("my.dll");//the huser32 is ok,the
dll is loaded.
            getwname mygetw = (getwname)GetAddress(huser32,
"getWNameOfComponnet",
 typeof(getwname));

        }

********************************


the getProcAddress(..) doesn't work.Where am i wrong?

date: Tue, 8 Jul 2008 07:37:56 -0700 (PDT)   author:   Ryanivanka