使用C#开发纽曼USB来电小秘书客户端小结

在前面用C#开发完CRM的来电弹屏之后，有些客户有了新的要求，他们希望不但能够实现来电弹屏，更希望能够将呼入呼出的电话录音并上传到CRM服务器上，方便日后跟踪记录。于是便有了来电小秘书客户端的开发。 
  来电小秘书客户端的开发是基于纽曼USB来电通客户端的基础上进行开发的，由于纽曼USB来电通的硬件没有录音功能，于是硬件上使用了纽曼的另一个硬件产品来电小秘书，虽然是同一个厂家的产品，可是它们的API却是完全不兼容，更烦的是，来电小秘书API没有来电的回调接口，无法通过回调触发程序，也没有C#的Demo，很多功能只能通过一个不是那么详细的文档和一个Delphi的Demo摸索着做了，经历了一些挫折和困惑，终于完成了这个客户端程序。 
  首先，开发要做的就是与硬件的API进行沟通，依然通过C#的P/Invoke来完成，以下是来电小秘书的P/Invoke代码。 
 

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace WindowsApplication1
{
    class LDT1
    {
        [DllImport("usbms.dll", EntryPoint = "LoadDRV")]
        public static extern int LoadDRV();

        [DllImport("usbms.dll", EntryPoint = "EnableCard")]
        public static extern int EnableCard();

        [DllImport("usbms.dll", EntryPoint = "StopSigCheck")]
        public static extern int StopSigCheck(int Handle);

        [DllImport("usbms.dll", EntryPoint = "ReSetUsb")]
        public static extern int ReSetUsb(int Handle);

        [DllImport("usbms.dll", EntryPoint = "HangUp")]
        public static extern int HangUp(int Handle);

        [DllImport("usbms.dll", EntryPoint = "InitDtmfBuf")]
        public static extern int InitDtmfBuf(int Handle);

        [DllImport("usbms.dll", EntryPoint = "SetDialPara")]
        public static extern int SetDialPara(UInt16 RingBack1, UInt16 RingBack0, UInt16 BusyLen, UInt16 RingTimes, UInt16 SendNoSignalLen);


        [DllImport("usbms.dll", EntryPoint = "DisableCard")]
        public static extern int DisableCard();

        [DllImport("usbms.dll", EntryPoint = "FreeDRV")]
        public static extern int FreeDRV();

        [DllImport("usbms.dll", EntryPoint = "GetDtmfCode")]
        public static extern int GetDtmfCode(UInt16 Line);

        [DllImport("usbms.dll", EntryPoint = "IsRing")]
        public static extern bool IsRing(UInt16 Line);

        [DllImport("usbms.dll", EntryPoint = "GetCallerIDStr")]
        public static extern UInt16 GetCallerIDStr(UInt16 Line, StringBuilder IDStr);


        [DllImport("usbms.dll", EntryPoint = "IsOffHook")]
        public static extern bool IsOffHook(UInt16 Line);


        [DllImport("usbms.dll", EntryPoint = "StartRecordFile")]
        public static extern bool StartRecordFile(UInt16 Line, string FileName, UInt32 dwRecordLen);

        [DllImport("usbms.dll", EntryPoint = "CheckRecordEnd")]
        public static extern bool CheckRecordEnd(UInt16 Line);


        [DllImport("usbms.dll", EntryPoint = "StopRecordFile")]
        public static extern bool StopRecordFile(UInt16 Line);

        [DllImport("usbms.dll", EntryPoint = "PCMtoWave")]
        public static extern int PCMtoWave(string SourceFileName, string TargetFileName);

        [DllImport("usbms.dll", EntryPoint = "ReadCheckResult")]
        public static extern int ReadCheckResult(int line, int mode);

        [DllImport("usbms.dll", EntryPoint = "StartSigCheck")]
        public static extern void StartSigCheck(int line);

        [DllImport("usbms.dll", EntryPoint = "ReadUsbState")]
        public static extern bool ReadUsbState(int line);

        [DllImport("usbms.dll", EntryPoint = "GetRingNum")]
        public static extern int GetRingNum(int line);

        [DllImport("usbms.dll", EntryPoint = "InitRingNum")]
        public static extern void InitRingNum(int line);

        [DllImport("usbms.dll", EntryPoint = "ReadSerialNo")]
        public static extern int ReadSerialNo(int line,StringBuilder serialNo);

    }
}

  然后就是关于设备状态检测了，由于没有API直接支持来电回调，所以只能自己手动的检测设备状态来判断，要实现这一部分一般有两种方式，使用Timer或者使用Thread，Delphi的Demo中使用了Timer，可是Timer实现的弊端需要使用异步的思考方式，不符合我的思维模式，灵活度也不够，而且C#创建线程太方便了，而线程是通过同步方式思考的，所以使用了Thread模式。 
  然后在特定的时刻，记录电话号码、弹屏（如果是来电）、电话结束后录音和上传文件和信息到CRM服务器，其中来电号码可以很容易的获取，可是播出的号码获取就比较的麻烦了，C#中可以使用如下代码： 
 

while (LDT1.IsOffHook((ushort)this.line))
{
      int temp = LDT1.GetDtmfCode((ushort)this.line);
       if (temp > 0)
       {
             phonenum = phonenum + this.convertInt(temp);
        }
       Thread.Sleep(300);

  }

private string convertInt(int code)
    {
        string ret="";
        switch (code)
        {
            case 10:
                ret = "0";
                break;
            case 11:
                ret = "*";
                break;
            case 12:
                ret = "#";
                break;
            case 13:
                ret = "A";
                break;
            case 14:
                ret = "B";
                break;
            case 15:
                ret = "C";
                break;
            case 16:
                ret = "D";
                break;
            default:
                ret = code.ToString();
                break;
        }
        return ret;
    }

  下面说一下C#中的大文件上传吧，网上有很多例子了，我参考了如下blog的代码进行开发http://www.cnblogs.com/bccu/archive/2009/01/05/1363771.html，可是无法上传成功，于是我读了一下代码，发现他将信息中的\r\n用空字符代替了，导致服务器无法识别，于是我更改了他的代码，解决了问题，代码如下： 

public static string UploadFileEx(string uploadfile, string url,
     string fileFormName, string contenttype, NameValueCollection querystring,
     CookieContainer cookies)
  {
      if ((fileFormName == null) ||
          (fileFormName.Length == 0))
      {
          fileFormName = "file";
      }

      if ((contenttype == null) ||
          (contenttype.Length == 0))
      {
          contenttype = "application/octet-stream";
      }


      string postdata;
      postdata = "?";
      if (querystring != null)
      {
          foreach (string key in querystring.Keys)
          {
              postdata += key + "=" + querystring.Get(key) + "&";
          }
      }
      Uri uri = new Uri(url + postdata);


      string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
      HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
      //webrequest.CookieContainer = cookies;
      webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
      webrequest.Method = "POST";
      string huanhang = "\r\n";
      byte[] huanhangbyte = Encoding.UTF8.GetBytes(huanhang);

      // Build up the post message header
      StringBuilder sb = new StringBuilder();
      sb.Append("--");
      sb.Append(boundary);
      sb.Append("\r\n");
      sb.Append("Content-Disposition: form-data; name=\"");
      sb.Append(fileFormName);
      sb.Append("\"; filename=\"");
      sb.Append(Path.GetFileName(uploadfile));
      sb.Append("\"");
      sb.Append("\r\n");
      sb.Append("Content-Type: ");
      sb.Append(contenttype);
      sb.Append("\r\n");
      sb.Append("\r\n");

      string postHeader = sb.ToString();
      byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

      // Build the trailing boundary string as a byte array
      // ensuring the boundary appears on a line by itself
      byte[] boundaryBytes =
             Encoding.ASCII.GetBytes("--" + boundary + "");

      FileStream fileStream = new FileStream(uploadfile,
                                  FileMode.Open, FileAccess.Read);
      long length = postHeaderBytes.Length + fileStream.Length +
                                             boundaryBytes.Length + huanhangbyte.Length;
      webrequest.ContentLength = length;

      Stream requestStream = webrequest.GetRequestStream();

      // Write out our post header
      requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

      // Write out the file contents
      byte[] buffer = new Byte[checked((uint)Math.Min(4096,
                               (int)fileStream.Length))];
      int bytesRead = 0;
      while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
          requestStream.Write(buffer, 0, bytesRead);
      requestStream.Write(huanhangbyte, 0, huanhangbyte.Length);
      // Write out the trailing boundary
      requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
      fileStream.Dispose();
      requestStream.Dispose();
      WebResponse responce = webrequest.GetResponse();
      Stream s = responce.GetResponseStream();
      StreamReader sr = new StreamReader(s);
      string retval=sr.ReadToEnd();
      sr.Dispose();

      if (File.Exists(uploadfile))
      {
          try
          {
              File.Delete(uploadfile);
          }catch(Exception e)
          {
          }
      }
      return retval;
  }

  CRM来电小秘书客户端完成了，当然要配合这个功能，服务器端CRM系统也要做一些修改，不过不是这篇文章的主要内容，关于服务器端的修改的小节，就等下次再说吧。