C#开发纽曼USB来电小秘书客户端总结

在使用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。

本文所述的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，不符合我们的思维模式，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，可以参考如下文章中的代码进行开发http://www.jb51.net/article/53377.htm，可是无法上传成功，于是解读了一下代码，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，于是在更改了他的代码之后，问题解决了，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，后续会有相关的报导。