C# 调用DLL问题

[dailihui123]

那位大侠帮我看看这个DLL调用，在Delphi中调用可以正常，在C#中一直出错，delphi的源代码 和dll的函数都附上。还有我用C#写的程序也一起附上，望高手给小弟看看，在C#中如何调用；

Code
USBDRVD_GetDevCount() //获取设备函数

UINT USBDRVD_GetDevCount(IN GUID * DeviceClassGUID); //函数声明


Example:
UINT DeviceCount = USBDRVD_GetDevCount(&GUID);



//一下为DELPHI 调用 可以正常显示
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
_GUID_ = record
l: DWORD;
s1: WORD;
s2: WORD;
c: array[1..8] of BYTE;
end {_GUID_};
type
TForm1 = class(TForm)
Button1: TButton;
Timer1: TTimer;
btnUSB: TLabel;
procedure Timer1Timer(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
USB_GUID:_GUID_;
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
DevCount:LONGINT;
implementation

{$R *.dfm}
function USBDRVD_GetDevCount(const p: _GUID_): Integer; stdcall;
external 'usbdrvd.dll';

procedure TForm1.Timer1Timer(Sender: TObject);
begin
DevCount:= USBDRVD_GetDevCount(USB_GUID);
btnUSB.Caption:= 'USB '+'( '+ inttoStr(DevCount)+' )';
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
USB_GUID.L:=$8B021AA5;
USB_GUID.S1:=$A319;
USB_GUID.S2:=$45C1;
USB_GUID.c[1]:=$93;
USB_GUID.c[2]:=$2C;
USB_GUID.c[3]:=$90;
USB_GUID.c[4]:=$AA;
USB_GUID.c[5]:=$82;
USB_GUID.c[6]:=$E6;
USB_GUID.c[7]:=$47;
USB_GUID.c[8]:=$8D;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
close;
end;

end.



///下边为C#调用 提示 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。
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 _5
{
public partial class Form1 : Form
{
public struct UINI
{
public Int64 L;
public Int64 S1;
public Int64 S2;
public Byte[] c;
}

public int DevCount;
public UINI USB_GUID;

public Form1()
{
InitializeComponent();
}

[DllImport("usbdrvd.dll")]
public static extern Int32 USBDRVD_GetDevCount(UINI USB_GUID);

private void button1_Click_1(object sender, EventArgs e)
{
Application.Exit();
}

private void Form1_Load(object sender, EventArgs e)
{

USB_GUID.c = new Byte[8];
USB_GUID.L=0x8B021AA5;
USB_GUID.S1=0xA319;
USB_GUID.S2=0x45C1;
USB_GUID.c[0]=0x93;
USB_GUID.c[1]=0x2C;
USB_GUID.c[2]=0x90;
USB_GUID.c[3]=0xAA;
USB_GUID.c[4]=0x82;
USB_GUID.c[5]=0xE6;
USB_GUID.c[6]=0x47;
USB_GUID.c[7]=0x8D;

}

private void timer1_Tick(object sender, EventArgs e)
{
try
{

DevCount = USBDRVD_GetDevCount(USB_GUID);
btnUSB.Text = "USB " + DevCount;
}

catch
{
btnUSB.Text = "USB " + "no fund";
}

}

}
}

C# 获取不到设备的信息
[DllImport("usbdrvd.dll")]
public static extern Int32 USBDRVD_GetDevCount(UINI USB_GUID);
这块应该怎么调用usbdrvd.dll呢？

[abcdef1111111]

不懂帮顶

[soaringbird]

unsafe public struct UINI
{
public UInt32 L;
public UInt16 S1;
public UInt16 S2;
public fixed Byte c[8];
}

或者
public struct UINI
{
public UInt32 L;
public UInt16 S1;
public UInt16 S2;
[MarshalAs(UnmanagedType.ByValArray,SizeConst=8)]
public Byte[] c;
}

[soaringbird]

[DllImport("usbdrvd.dll")]
public static extern Int32 USBDRVD_GetDevCount(UINI* USB_GUID);
用第一种UINI定义

[soaringbird]

或者
[DllImport("usbdrvd.dll")]
public static extern Int32 USBDRVD_GetDevCount(IntPtr USB_GUID);
这种比较麻烦

[Jiacker]

2楼的应该可以

[dailihui123]

还是不行啊
用一下这两种：
unsafe public struct UINI
{
public UInt32 L;
public UInt16 S1;
public UInt16 S2;
public fixed Byte c[8];
}

或者
public struct UINI
{
public UInt32 L;
public UInt16 S1;
public UInt16 S2;
[MarshalAs(UnmanagedType.ByValArray,SizeConst=8)]
public Byte[] c;
}
会提示 “不安全代码只会在使用 /unsafe 编译的情况下出现”

用这种
[DllImport("usbdrvd.dll")]
public static extern Int32 USBDRVD_GetDevCount(UINI* USB_GUID);

会提示： “指针和固定大小缓冲区只能在不安全的上下文中使用”
还是解决不了啊 。

[蓝色韵脚]

楼上的有了，我就不回答了！

[soaringbird]

在项目属性里设置一下即可

[dailihui123]

大侠 我是个新手，在项目属性里怎么设置呢？？？？

[dailihui123]

我这样在属性里设置 “将允许不安全代码”打上勾能编译过去了 运行后还是出现同样的问题

[Jiacker]

[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct UINI
{
public UInt32 L;
public UInt16 S1;
public UInt16 S2;
[MarshalAs(UnmanagedType.ByValArray,SizeConst=8)]
public Byte[] c;
}

[dailihui123]

大侠能否留个QQ 啊 这里不能传文件啊

[soaringbird]

哦，这里，改成这样：
[DllImport("usbdrvd.dll")]
unsafe public static extern Int32 USBDRVD_GetDevCount(UINI* USB_GUID);
或者在类前面加上unsafe就一了百了了。