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，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。