在使用C#開發完CRM的來電彈屏之后，有些客戶有了新的要求，他們希望不但能夠實現來電彈屏，更希望能夠將呼入呼出的電話錄音并上傳到CRM服務器上，方便日后跟蹤記錄。于是便有了來電小秘書客戶端的開發。
本文所述的來電小秘書客戶端的開發是基于紐曼USB來電通客戶端的基礎上進行開發的，由于紐曼USB來電通的硬件沒有錄音功能，于是硬件上使用了紐曼的另一個硬件產品來電小秘書，雖然是同一個廠家的產品，可是它們的API卻是完全不兼容，更煩的是，來電小秘書API沒有來電的回調接口，無法通過回調觸發程序，也沒有C#的Demo，很多功能只能通過一個不是那么詳細的文檔和一個Delphi的Demo摸索著做了，經歷了一些挫折和困惑，終于完成了這個客戶端程序。
首先，開發要做的就是與硬件的API進行溝通，依然通過C#的P/Invoke來完成，以下是來電小秘書的P/Invoke代碼。
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); } } 然后就是關于設備狀態檢測了，由于沒有API直接支持來電回調，所以只能自己手動的檢測設備狀態來判斷，要實現這一部分一般有兩種方式，使用Timer或者使用Thread，Delphi的Demo中使用了Timer，可是Timer實現的弊端需要使用異步的思考方式，不符合我們的思維模式，靈活度也不夠，而且C#創建線程太方便了，而線程是通過同步方式思考的，所以使用了Thread模式。
然后在特定的時刻，記錄電話號碼、彈屏（如果是來電）、電話結束后錄音和上傳文件和信息到CRM服務器，其中來電號碼可以很容易的獲取，可是播出的號碼獲取就比較的麻煩了，C#中可以使用如下代碼：
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; } 下面說一下C#中的大文件上傳吧，網上有很多例子了，可以參考如下文章中的代碼進行開發//www.49028c.com/article/53377.htm，可是無法上傳成功，于是解讀了一下代碼，發現他將信息中的/r/n用空字符代替了，導致服務器無法識別，于是在更改了他的代碼之后，問題解決了，代碼如下：
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來電小秘書客戶端完成了，當然要配合這個功能，服務器端CRM系統也要做一些修改，不過不是這篇文章的主要內容，關于服務器端的修改的小節，后續會有相關的報導。
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