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rn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 = "rn"; byte[] huanhangbyte = Encoding.UTF8.GetBytes(huanhang); // Build up the post message header StringBuilder sb = new StringBuilder(); sb.Append("--"); sb.Append(boundary); sb.Append("rn"); sb.Append("Content-Disposition: form-data; name=""); sb.Append(fileFormName); sb.Append(""; filename=""); sb.Append(Path.GetFileName(uploadfile)); sb.Append("""); sb.Append("rn"); sb.Append("Content-Type: "); sb.Append(contenttype); sb.Append("rn"); sb.Append("rn"); 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。
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