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05.09.2008 at 06:15AM PDT, ID: 23389139
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9.2

passing structure by reference from C# to C function

Zones: C# Programming Language, Visual Studio .NET 2005
Dear all,
I have a problem. I have to pass s struct from c# to a C++ DLL..
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cpp
 
***************************************************
 
typedef struct
 
{
 
char szChiaveRicerca[21];
 
}TDescReqTransazione;
 
 
 
typedef enum
 
{
 
TP_NONE = 0,
 
TP_REQ_IDENT_PREN,
 
TP_REQ_NOTIF_PAG,
 
TP_NOTIF_PAG_EXT, 
 
TP_CHIUSURA_TURNO,
 
TP_REQ_LISTA_PRENOTAZIONI, 
 
TP_REQ_CAT, 
 
}TTipoMsg;
 
 
 
 
 
extern "C" TTipoMsg __declspec(dllexport) TestMessaggioRicevuto( TDescReqTransazione &codPren,
 
unsigned short &nSportello );
 
 
 
***********************************************************
 
and I've tried like this in c#
 
 
 
MyDll.cs
 
**************************************************************
 
using System;
 
using System.Collections.Generic;
 
using System.Text;
 
using System.Runtime.InteropServices;
 
namespace ConsoleApplication1
 
{
 
class MyDll
 
{
 
 
public enum TTipoMsg
 
{
 
TP_NONE = 0,
 
TP_REQ_IDENT_PREN,
 
TP_REQ_NOTIF_PAG,
 
TP_NOTIF_PAG_EXT,
 
TP_CHIUSURA_TURNO,
 
TP_REQ_LISTA_PRENOTAZIONI, 
 
TP_REQ_CAT, 
 
};
 
 
 
[StructLayout(LayoutKind.Sequential)]
 
public struct TDescReqTransazione
 
{
 
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 21)]
 
public String szChiaveRicerca;
 
}
 
 
 
 
 
[DllImport(@"C:\Documents and Settings\nick\Documenti\Visual Studio 2005\Projects\ConsoleApplication1\ConsoleApplication1\bin\Debug\TcpCup.dll",
 
EntryPoint = "_TestMessaggioRicevuto")]
 
public static extern TTipoMsg TestMessaggioRicevuto(ref TDescReqTransazione codPren,ref ushort nSportello);
 
}
 
}
 
 
 
program.cs
 
******************************************************************************************
 
using System;
 
using System.Collections.Generic;
 
using System.Text;
 
namespace ConsoleApplication1
 
{
 
class Program
 
{
 
static void Main(string[] args)
 
{
 
MyDll.TTipoMsg tipoMesRec;
 
MyDll.TDescReqTransazione codPren = new MyDll.TDescReqTransazione();
 
ushort nSportello = 0;
 
 
 
tipoMesRec = MyDll.TestMessaggioRicevuto(ref codPren, ref nSportello);
 
 
 
switch( tipoMesRec )
 
{ 
 
case MyDll.TTipoMsg.TP_REQ_IDENT_PREN:
 
Console.WriteLine("TP_REQ_IDENT_PREN");
 
break;
 
case MyDll.TTipoMsg.TP_REQ_NOTIF_PAG:
 
Console.WriteLine("TP_REQ_NOTIF_PAG");
 
break;
 
case MyDll.TTipoMsg.TP_NOTIF_PAG_EXT:
 
Console.WriteLine("TP_NOTIF_PAG_EXT");
 
break;
 
case MyDll.TTipoMsg.TP_CHIUSURA_TURNO:
 
Console.WriteLine("TP_CHIUSURA_TURNO");
 
break;
 
case MyDll.TTipoMsg.TP_REQ_LISTA_PRENOTAZIONI:
 
Console.WriteLine("TP_REQ_LISTA_PRENOTAZIONI");
 
break;
 
case MyDll.TTipoMsg.TP_REQ_CAT:
 
Console.WriteLine("TP_REQ_CAT");
 
break;
 
case MyDll.TTipoMsg.TP_NONE:
 
Console.WriteLine("TP_NONE");
 
break;
 
}
 
}
 
}
 
 
 
unfortunaly it doesn't seem to work...
 
 
 
How is the right way to pass parameters?
 
 
 
thanks
 
Nick
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Question Stats
Zone: Programming
Question Asked By: darksail
Solution Provided By: josgood
Participating Experts: 1
Solution Grade: B
Views: 13
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05.09.2008 at 09:03AM PDT, ID: 21534225

Rank: Master

josgood:

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05.09.2008 at 09:42AM PDT, ID: 21534560

Rank: Master

josgood:

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05.12.2008 at 01:11AM PDT, ID: 21545261
darksail:

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05.12.2008 at 08:45PM PDT, ID: 21552172

Rank: Master

josgood:

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05.13.2008 at 12:50AM PDT, ID: 21552984
darksail:

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