accessing c++ api's (dlls) on c#

[wizkid]

hi everyone.. Im having trouble in accessing an api from c++ dll using c# platform.. I would like to retreive data from this api... I think im lost
pls help me...

//this is the api created from visual c++ taht i would like to access
//using c# platform..
 
bool WINAPI SCSYS_GetDeviceInfo( int Type, int Index, void *DevInf )
 
 
    typedef struct _SCDeviceInfo
 
    {
 
        char    DriverName[80];      
        char    DriverNameL[80];    
        int     SlotNumber;     
        int     DeviceIndex;     
        WORD    Enable;      
        WORD    DeviceID;   
        WORD    VendorID;  
        WORD    Revision;   
        DWORD   VersionID;
        DWORD   xxx1[2];
        DWORD   PciBaseMemAdr;
        DWORD   PciBaseIOAdr;   
        DWORD   BaseMemSize;  
        DWORD   CrmsIocTop;      
        DWORD   CrmsIocSize;     
        DWORD   ProgramCode;    
        DWORD   ErrorCode;         
        DWORD   xxx2[3];
 
    } SCDeviceInfo;
 
//here is my c# implementation...
 
        [StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi,Pack=2)]
        public struct SCDeviceInfo //class DevInfo
        {
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
            public string DriverName;
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
            public string DriverNameL;
            public int SlotNumber;
            public int DeviceIndex;
            public System.UInt16 Enable;
            public System.UInt16 DeviceID;
            public System.UInt16 VendorID;
            public System.UInt16 Revision;
            public System.UInt32 VersionID;
           [MarshalAs(UnmanagedType.U4,SizeConst=2)] public UInt32 xxx1;
            public System.UInt32 PciBaseMemAdr;
            public System.UInt32 PciBaseIOAdr;
            public System.UInt32 BaseMemSize;
            public System.UInt32 CrmsIocTop;
            public System.UInt32 CrmsIocSize;
            public System.UInt32 ProgramCode;
            public System.UInt32 ErrorCode;
            [MarshalAs(UnmanagedType.U4, SizeConst = 3)] public UInt32 xxx2;
 
  }
 
 
 
   SCDeviceInfo sc = new SCDeviceInfo();
   IntPtr pInfo = Marshal.AllocHGlobal(Marshal.SizeOf(sc));
   SCSYS_GetDeviceInfo(1, 0, pInfo);
   sc.DriverName = "aloha";
   Marshal.StructureToPtr(sc, pInfo, false);
   SCDeviceInfo NewVal;
   NewVal = (SCDeviceInfo)Marshal.PtrToStructure(pInfo, typeof(SCDeviceInfo));
   MessageBox.Show(NewVal.DriverName.ToString());
 

problem is I cant retrive any value in my structure... pls help me... :(