救命啊菜鸟在此求C#引用dll问题

Question

菜鸟第一次用需要详细指导，自己对应相应的数据函数老出错......
C++
typedef enum {
    RESULT_INITIALIZE = -1,
    RESULT_SUCCESS = 0,  
} Result_t;Result_t oemWaitForDecode(DWORD dwTime,
                          PTCHAR ptcMessage,
                          PTCHAR ptcCodeID,
                          PTCHAR ptcAimId,
                          PTCHAR ptcSymModifier,
                          PWORD pnLength, BOOL(*fpCallBack) (void));
c#如何调用这个函数接口？数据类型怎样对应？求详细指导？
请大牛们写下定义到使用代码提供我参考下吧。

Answer 1

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;namespace ConsoleApplication6
{
    class Program
    {
        [DllImport("DLL的名字", CharSet = CharSet.Ansi)]
        public static extern Result oemWaitForDecode(uint dwTime, string ptcMessage, string ptcCodeID,
            string ptcAimId, string ptcSymModifier, ref ushort pnLength, FPCallBack fp);
        public delegate bool FPCallBack();
        static FPCallBack fp;
        static void Main(string[] args)
        {
            fp = fpCallBack;
            //调用oemWaitForDecode
            Console.ReadLine();
        }
        static bool fpCallBack()
        {
            //...
            return true;
        }
        public enum Result
        {
            RESULT_INITIALIZE = -1,
            RESULT_SUCCESS = 0 
        }
    }
}试试看

Answer 2

多谢lizhibin11兄 我先试试o(∩_∩)o

Answer 3

lizhibin11兄 好像还是有问题

Answer 4

        [DllImport("DLL的名字", CharSet = CharSet.Ansi)]
        public static extern Result oemWaitForDecode(uint dwTime, System.Text.StringBuilder ptcMessage, System.Text.StringBuilder ptcCodeID,
            System.Text.StringBuilder ptcAimId, System.Text.StringBuilder ptcSymModifier, ref ushort pnLength, FPCallBack fp);
        public delegate bool FPCallBack();
        static FPCallBack fp;
   static void Main(string[] args)
        {  fp = fpCallBack;
System.Text.StringBuilder ptcMessage=new System.Text.StringBuilder(1024)
System.Text.StringBuilder ptcCodeID=new System.Text.StringBuilder(1024)
System.Text.StringBuilder ptcAimId=new System.Text.StringBuilder(1024)
System.Text.StringBuilder ptcSymModifier=new System.Text.StringBuilder(1024)
//
            //调用oemWaitForDecode
     }

Answer 5

xingyuebuyu
兄:现在还是报出这样的异常我是在wince环境下调用的能帮我看看这个什么问题吗？
帮助文档上说了：
当使用 .NET Compact Framework 并对本机函数使用 P/Invoke 时，如果出现以下情况，则会引发此异常：托管代码中的声明不正确。.NET Compact Framework 不支持尝试执行的操作。DLL 名称在导出时难以分辨。在这样的情况下，请检查：任何违反 .NET Compact Framework P/Invoke 限制的行为。任何需要预分配内存的参数。如果存在这种情况，应传递对现有变量的引用。导出的函数的名称正确。这可以通过 DumpBin.exe 进行验证。您没有尝试传递过多的参数。未处理 System.NotSupportedException
  Message="0x80131515"
  StackTrace:
    位于 SmartDeviceProject1.Form1.button1_Click(Object sender, EventArgs e)
    位于 System.Windows.Forms.Control.OnClick(EventArgs e)
    位于 System.Windows.Forms.Button.OnClick(EventArgs e)
    位于 System.Windows.Forms.ButtonBase.WnProc(WM wm, Int32 wParam, Int32 lParam)
    位于 System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam)
    位于 Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain)
    位于 System.Windows.Forms.Application.Run(Form fm)
    位于 SmartDeviceProject1.Program.Main()

Answer 6

http://blogs.msdn.com/b/eldar/archive/2007/04/03/a-lot-of-hresult-codes.aspx
COR_E_NOTSUPPORTED  0x80131515 -2146233067 
首先要确认你的DLL是能支持wince环境的？
另外你的异常是停在oemWaitForDecode这句上？另外把代码贴出来

Answer 7

是支持wince环境的dll。
是停留在oemwaitfordecode这个函数上的异常。
这个是引用dll的C#相关代码：namespace oem5x00sdk
{
    [StructLayout(LayoutKind.Sequential)]
    public class oemdecodeceDll
    {
        public delegate bool fpCallBack();
        [DllImport("oemdecodece.dll", EntryPoint = "oemWaitForDecode",CharSet=CharSet.Ansi)]
        extern public static Result_t oemWaitForDecode(uint dwTime, System.Text.StringBuilder ptcMessage, System.Text.StringBuilder ptcCodeID,
                                                  System.Text.StringBuilder ptcAimId, System.Text.StringBuilder ptcSymModifier, ref ushort pnLength,
                                                  fpCallBack fp_CallBack);
    }
    public enum Result_t
    {
        RESULT_INITIALIZE = -1,
        RESULT_SUCCESS = 0,  
    }
}
C#实现这个函数功能：
        public bool p_callBack()
        {
            return true;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //const int MAX_MESSAGE_LENGTH=4096;
            //string pMessage = MAX_MESSAGE_LENGTH.ToString();
            //pMessage[0] = oem_waitfordecode.message;
            //string pID = null;
            //string pamID = null;
            //string psmFier = null;
            ushort plength=0;
            System.Text.StringBuilder pMessage = new System.Text.StringBuilder(1024);
            System.Text.StringBuilder pID = new System.Text.StringBuilder(1024);
            System.Text.StringBuilder pamID = new System.Text.StringBuilder(1024);
            System.Text.StringBuilder psmFier = new System.Text.StringBuilder(1024);
            oem5x00sdk.oemdecodeceDll.fpCallBack fp_CallBack = new oem5x00sdk.oemdecodeceDll.fpCallBack(p_callBack);
            int i=(int)oem5x00sdk.oemdecodeceDll.oemWaitForDecode(5000, pMessage, pID, pamID, psmFier,ref plength,fp_CallBack);
            if ( i==(int)oem5x00sdk.Result_t.RESULT_SUCCESS)
                MessageBox.Show("ok");
            textBox1.Text =pMessage.ToString();          
        }C++引用这个函数功能的是这样的，我想用C#替换实现该怎么样实现？MAX_MESSAGE_LENGTH是接口里面定义的常量#define MAX_MESSAGE_LENGTH 4096；TCHAR bMessage[MAX_MESSAGE_LENGTH];
TCHAR code[1];TCHAR aim[1];TCHAR sym[1];
WORD nLength;
Result_t nResult = ::oemWaitForDecode(5000,&bMessage[0],&code[0],&aim[0],&sym[0],&nLength,&CB);

if(nResult == RESULT_SUCCESS)
{
::PlaySound(_T("\\Windows\\VoicBeep.wav"),NULL,SND_FILENAME|SND_ASYNC);
}
else
{
bMessage[0]=0x00;
}
SetDlgItemTextW(IDC_EDIT1,(LPCTSTR)bMessage);

Answer 8

xingyuebuyu兄
补充下我还用c#调用了下dll里面的一个不带参数的函数是可以调用的.

Answer 9

    public class oemdecodeceDll
    {
        public delegate bool fpCallBack();
        [DllImport("oemdecodece.dll", EntryPoint = "oemWaitForDecode",CharSet=CharSet.Ansi)]
        extern public static Result_t oemWaitForDecode(uint dwTime, ref char ptcMessage, ref char ptcCodeID,ptcAimId, ref char ptcSymModifier, ref ushort pnLength,fpCallBack fp_CallBack);            oem5x00sdk.oemdecodeceDll.fpCallBack fp_CallBack = new oem5x00sdk.oemdecodeceDll.fpCallBack(p_callBack);
        private void button1_Click(object sender, EventArgs e)
        {
            //const int MAX_MESSAGE_LENGTH=4096;
            //string pMessage = MAX_MESSAGE_LENGTH.ToString();
            //pMessage[0] = oem_waitfordecode.message;
            //string pID = null;
            //string pamID = null;
            //string psmFier = null;
            ushort plength=0;
            char[] pMessage = new char[4096];
            char[] pID = new char[2];
            char[] pamID = new char[2];
            char[] psmFier = new char[2];            int i=(int)oem5x00sdk.oemdecodeceDll.oemWaitForDecode(5000, ref pMessage[0],ref pID[0], ref pamID[0],ref psmFier[0],ref plength,fp_CallBack);
            if ( i==(int)oem5x00sdk.Result_t.RESULT_SUCCESS)
                MessageBox.Show("ok");
            textBox1.Text =pMessage.ToString();          
        }C++中CB是如何赋值的

Answer 10

C++的cb是一个方法：
BOOL CB(void)
{
return TRUE;
}

Answer 11

还是报上面的异常：
未处理 System.NotSupportedException
  Message="0x80131515"
  StackTrace:
  位于 SmartDeviceProject1.Form1.button1_Click(Object sender, EventArgs e)
  位于 System.Windows.Forms.Control.OnClick(EventArgs e)
  位于 System.Windows.Forms.Button.OnClick(EventArgs e)
  位于 System.Windows.Forms.ButtonBase.WnProc(WM wm, Int32 wParam, Int32 lParam)
  位于 System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam)
  位于 Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain)
  位于 System.Windows.Forms.Application.Run(Form fm)
  位于 SmartDeviceProject1.Program.Main()
大牛们快来啊！搞的我快要吐血了！
搞定了我开帖给散分.

Answer 12

 public delegate bool fpCallBack();
        [DllImport("oemdecodece.dll", EntryPoint = "oemWaitForDecode",CharSet=CharSet.Ansi)]
        extern public static Result_t oemWaitForDecode(uint dwTime, ref char ptcMessage, ref char ptcCodeID,ptcAimId, ref char ptcSymModifier, ref ushort pnLength,ref fpCallBack 
最后一个参数再改下试试
也有可能和下面的问题一样
http://topic.csdn.net/u/20110216/10/20386e55-f99d-499a-9041-06e48b2228a1.html

Answer 13

xingyuebuyu兄：
还是不行 我都试的快吐了......

Answer 14

我不清楚DLL中的TCHAR是8位还是16位的，假设是八位的，按照c++的方式，尝试一下下面这个using System;
using System.Text;
using System.Runtime.InteropServices;namespace ConsoleApplication11
{
    class Program
    {
        [DllImport("DLL的名字", CharSet = CharSet.Ansi)]
        public static extern Result oemWaitForDecode(uint dwTime, IntPtr ptcMessage, 
                           IntPtr ptcCodeID, IntPtr ptcAimId, IntPtr ptcSymModifier, 
                           IntPtr pnLength, FPCallBack fp);
        public delegate bool FPCallBack();
        static FPCallBack fp;
        static byte[] ptcmessage = new byte[4096];
        static byte[] ptccodeid = new byte[1];
        static byte[] ptcaimid = new byte[1];
        static byte[] ptcsymmodifier = new byte[1];
        static ushort[] pnlength = new ushort[1];
        static void Main(string[] args)
        {
            fp = fpCallBack;
            IntPtr message = Marshal.UnsafeAddrOfPinnedArrayElement(ptcmessage, 0);
            IntPtr codeid = Marshal.UnsafeAddrOfPinnedArrayElement(ptccodeid, 0);
            IntPtr aimid = Marshal.UnsafeAddrOfPinnedArrayElement(ptcaimid, 0);
            IntPtr symmodifier = Marshal.UnsafeAddrOfPinnedArrayElement(ptcsymmodifier, 0);
            IntPtr length = Marshal.UnsafeAddrOfPinnedArrayElement(pnlength, 0);
            Result result = oemWaitForDecode(5000, message, codeid, aimid, 
                                            symmodifier, length, fp);
            Console.ReadLine();
        }
        static bool fpCallBack()
        {
            //...
            return true;
        }
        public enum Result
        {
            RESULT_INITIALIZE = -1,
            RESULT_SUCCESS = 0 
        }
    }
}

Answer 15

如果TCHAR是16位的，尝试下面这个using System;
using System.Text;
using System.Runtime.InteropServices;namespace ConsoleApplication11
{
    class Program
    {
        [DllImport("DLL的名字", CharSet = CharSet.Ansi)]
        public static extern Result oemWaitForDecode(uint dwTime, IntPtr ptcMessage, 
                                                     IntPtr ptcCodeID,
                                                     IntPtr ptcAimId, 
                                                     IntPtr ptcSymModifier, 
                                                     IntPtr pnLength, 
                                                     FPCallBack fp);
        public delegate bool FPCallBack();
        static FPCallBack fp;
        static char[] ptcmessage = new char[4096];
        static char[] ptccodeid = new char[1];
        static char[] ptcaimid = new char[1];
        static char[] ptcsymmodifier = new char[1];
        static ushort[] pnlength = new ushort[1];
        static void Main(string[] args)
        {
            fp = fpCallBack;
            IntPtr message = Marshal.UnsafeAddrOfPinnedArrayElement(ptcmessage, 0);
            IntPtr codeid = Marshal.UnsafeAddrOfPinnedArrayElement(ptccodeid, 0);
            IntPtr aimid = Marshal.UnsafeAddrOfPinnedArrayElement(ptcaimid, 0);
            IntPtr symmodifier = Marshal.UnsafeAddrOfPinnedArrayElement(ptcsymmodifier, 0);
            IntPtr length = Marshal.UnsafeAddrOfPinnedArrayElement(pnlength, 0);
            Result result = oemWaitForDecode(5000, message, codeid, aimid, symmodifier, length, fp);
            Console.ReadLine();
        }
        static bool fpCallBack()
        {
            //...
            return true;
        }
        public enum Result
        {
            RESULT_INITIALIZE = -1,
            RESULT_SUCCESS = 0 
        }
    }
}

Answer 16

试试CharSet.Unicode最后，建议你用C++再写个DLL将oemWaitForDecode函数以及回调函数都封装在这个新的DLL中，只开放前面的一些参数，暂时先解决问题，可能是WINCE平台C#获取函数指针有问题

Answer 17

Marshal后面这个方法UnsafeAddrOfPinnedArrayElement();
好像在。netcf库中没有该方法......

Answer 18

我在用手机上，那你改成GcHandle.alloc

Answer 19

您的意思重新封装这个旧的dll导出函数oemWaitForDecode实现到新的dll供c#引用，可以不用对应参数引用？
是这样的话C++重新写dll封装导出函数实现没做过不知道怎么做？
还请麻烦详细指教啊......先谢xingyuebuyu兄了！

Answer 20

好的 lizhibin11兄 我试试
你还不休息啊o(∩_∩)o 小心lp不让你上床