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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);
}
}
</div>
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;
}
</div>
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.weikejianghu.com/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
requestS