关于dll的调用[delphi]转为[C#]
这个是delphi下的调用语句:
===========
unit Unit1;

interface


uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
Function OpenImage (Const str1 : string ;Var ch1 : LongWord;Var ch2 : LongWord;Var ch3 : LongWord;Var ch4 : LongWord ): LongWord; Stdcall; External 'DISCERN.dll ';


type
TForm1 = class(TForm)
Button1: TButton;
OpenDialog1: TOpenDialog;
Edit1: TEdit;
procedure Button1Click(Sender: TObject);

private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
str1:string;
s,c1,c2,c3,c4:LongWord;
begin

str1:= extractfilepath(paramstr(0)) + '061031163601Code.bmp ' ;
s:= OpenImage(str1 , c1 , c2 , c3 , c4);
edit1.Text:= chr(c1) + chr(c2) + chr(c3) + chr(c4) ;
end;

end.

===========


这是我写的C#调用的语句,但出错啦~~说是:
[尝试读取或写入受保护的内存。这通常指示其他内存已损坏。]
请大侠帮我看看,我不会调用
=========
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace WindowsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

[DllImport( "discern.dll ")]
public static extern string OpenImage(string str1, char c1, char c2, char c3, char c4);

private void button1_Click(object sender, EventArgs e)
{
string cog_ycad = Environment.CurrentDirectory.ToString() + "\\061031163601Code.bmp ";
char c1 = char.Parse( " ");

char c2 = char.Parse( " ");
char c3 = char.Parse( " ");
char c4 = char.Parse( " ");
char s = char.Parse( " ");
OpenImage(cog_ycad, c1, c2, c3, c4);
textBox1.Text = c1.ToString() + c2.ToString() + c3.ToString() + c4.ToString();
}

}
}

=========

顺便再给我另一个贴一个广告,也求大侠们帮帮忙
http://community.csdn.net/Expert/topic/5275/5275624.xml?temp=.1751215

[解决办法]
帮顶了！
[解决办法]
写出标准函数定义吧.这样大家比较容易帮你转换.

[解决办法]
自顶