Hi,
I am trying to call an unmanaged funcrtion from a simple eMbedded Visual C++ dll, but I only get the MissingMethodException. This is the first time I'm trying do use unmanaged code. Here is a sample of my code:
c++ dll:
header file:
#ifdef TTWRAPPER_EXPORTS
#define TTWRAPPER_API __declspec(dllexport)
#else
#define TTWRAPPER_API __declspec(dllimport)
#endif
// This class is exported from the ttwrapper.dll
class TTWRAPPER_API CTtwrapper {
public:
CTtwrapper(void);
// TODO: add your methods here.
};
extern TTWRAPPER_API int nTtwrapper;
#ifdef __cplusplus
extern "C"
{
#endif
TTWRAPPER_API int fnTtwrapper();
#ifdef __cplusplus
} // extern "C"
#endif
cpp file:
#include "stdafx.h"
#include "ttwrapper.h"
BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
TTWRAPPER_API int nTtwrapper=0;
TTWRAPPER_API int fnTtwrapper()
{
int t = 15;
return t;
}
CTtwrapper::CTtwrapper()
{
return;
}
my simple C# device app:
using System.Runtime.InteropServices;
using System;
using System.Drawing;
using System.Collections;
using System.Windows.Forms;
using System.Data;
namespace Managed
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.MainMenu mainMenu1;
[DllImport("ttwrapper.dll", EntryPoint="fnTtwrapper")]
public static extern int fnTtwrapper();
public Form1()
{
InitializeComponent();
}
static void Main()
{
Application.Run(new Form1());
}
private void button1_Click(object sender, System.EventArgs e)
{
try
{
int i = fnTtwrapper();
this.textBox1.Text = "taller er: " + i;
}
catch(Exception ex)
{
this.textBox2.Text = ex.Message;
}
}
}
}
Read that many ask for DUMPBIN exports, this is:
Section contains the following exports for ttwrapper.dll
00000000 characteristics
42819B5C time date stamp Wed May 11 07:42:52 2005
0.00 version
1 ordinal base
4 number of functions
4 number of names
ordinal hint RVA name
1 0 00001030 ??0CTtwrapper@@QAA@XZ
2 1 00001000 ??4CTtwrapper@@QAAAAV0@ABV0@@Z
3 2 00003028 ?nTtwrapper@@3HA
4 3 00001028 fnTtwrapper
Summary
1000 .data
1000 .pdata
1000 .rdata
1000 .reloc
1000 .text
Anyone who can help me?? I'm testing on a real device via visual studio .net 03
Thomas