C#实现调用迅雷下载的方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;

namespace ThunderSDK
{
 class Program
 {
 enum enumTaskStatus
 {
  enumTaskStatus_Connect = 0,         // 已经建立连接
  enumTaskStatus_Download = 2,        // 开始下载 
  enumTaskStatus_Pause = 10,         // 暂停
  enumTaskStatus_Success = 11,        // 成功下载
  enumTaskStatus_Fail = 12,          // 下载失败
 };
 public const int XL_SUCCESS = 0;
 public const int XL_ERROR_FAIL = 0x10000000;

 // 尚未进行初始化
 public const int XL_ERROR_UNINITAILIZE = XL_ERROR_FAIL + 1;

 // 不支持的协议，目前只支持HTTP
 public const int XL_ERROR_UNSPORTED_PROTOCOL = XL_ERROR_FAIL + 2;

 // 初始化托盘图标失败
 public const int XL_ERROR_INIT_TASK_TRAY_ICON_FAIL = XL_ERROR_FAIL + 3;

 // 添加托盘图标失败
 public const int XL_ERROR_ADD_TASK_TRAY_ICON_FAIL = XL_ERROR_FAIL + 4;

 // 指针为空
 public const int XL_ERROR_POINTER_IS_NULL = XL_ERROR_FAIL + 5;

 // 字符串是空串
 public const int XL_ERROR_STRING_IS_EMPTY = XL_ERROR_FAIL + 6;

 // 传入的路径没有包含文件名
 public const int XL_ERROR_PATH_DONT_INCLUDE_FILENAME = XL_ERROR_FAIL + 7;

 // 创建目录失败
 public const int XL_ERROR_CREATE_DIRECTORY_FAIL = XL_ERROR_FAIL + 8;

 // 内存不足
 public const int XL_ERROR_MEMORY_ISNT_ENOUGH = XL_ERROR_FAIL + 9;

 // 参数不合法
 public const int XL_ERROR_INVALID_ARG = XL_ERROR_FAIL + 10;

 // 任务不存在
 public const int XL_ERROR_TASK_DONT_EXIST = XL_ERROR_FAIL + 11;

 // 文件名不合法
 public const int XL_ERROR_FILE_NAME_INVALID = XL_ERROR_FAIL + 12;

 // 没有实现
 public const int XL_ERROR_NOTIMPL = XL_ERROR_FAIL + 13;

 // 已经创建的任务数达到最大任务数，无法继续创建任务
 public const int XL_ERROR_TASKNUM_EXCEED_MAXNUM = XL_ERROR_FAIL + 14;

 // 任务类型未知
 public const int XL_ERROR_INVALID_TASK_TYPE = XL_ERROR_FAIL + 15;

 // 文件已经存在
 public const int XL_ERROR_FILE_ALREADY_EXIST = XL_ERROR_FAIL + 16;

 // 文件不存在
 public const int XL_ERROR_FILE_DONT_EXIST = XL_ERROR_FAIL + 17;

 // 读取cfg文件失败
 public const int XL_ERROR_READ_CFG_FILE_FAIL = XL_ERROR_FAIL + 18;

 // 写入cfg文件失败
 public const int XL_ERROR_WRITE_CFG_FILE_FAIL = XL_ERROR_FAIL + 19;

 // 无法继续任务，可能是不支持断点续传，也有可能是任务已经失败
 // 通过查询任务状态，确定错误原因。
 public const int XL_ERROR_CANNOT_CONTINUE_TASK = XL_ERROR_FAIL + 20;

 // 无法暂停任务，可能是不支持断点续传，也有可能是任务已经失败
 // 通过查询任务状态，确定错误原因。
 public const int XL_ERROR_CANNOT_PAUSE_TASK = XL_ERROR_FAIL + 21;

 // 缓冲区太小
 public const int XL_ERROR_BUFFER_TOO_SMALL = XL_ERROR_FAIL + 22;

 // 调用XLInitDownloadEngine的线程，在调用XLUninitDownloadEngine之前已经结束。
 // 初始化下载引擎线程，在调用XLUninitDownloadEngine之前，必须保持执行状态。
 public const int XL_ERROR_INIT_THREAD_EXIT_TOO_EARLY = XL_ERROR_FAIL + 23;

 [DllImport("XLDownload.dll", EntryPoint = "XLInitDownloadEngine")]
 public static extern bool XLInitDownloadEngine();
 [DllImport("XLDownload.dll", EntryPoint = "XLURLDownloadToFile", CharSet = CharSet.Unicode)]
 public static extern int XLURLDownloadToFile(string pszFileName, string pszUrl, string pszRefUrl, ref Int32 lTaskId);
 [DllImport("XLDownload.dll")]
 public static extern int XLQueryTaskInfo(int lTaskId, ref int plStatus, ref double pullFileSize, ref double pullRecvSize);
 [DllImport("XLDownload.dll")]
 public static extern int XLPauseTask(int lTaskId, ref int lNewTaskId);
 [DllImport("XLDownload.dll")]
 public static extern int XLContinueTask(int lTaskId);
 [DllImport("XLDownload.dll")]
 public static extern int XLContinueTaskFromTdFile(string pszTdFileFullPath, ref int lTaskId);
 [DllImport("XLDownload.dll")]
 public static extern void XLStopTask(int lTaskId);
 [DllImport("XLDownload.dll")]
 public static extern bool XLUninitDownloadEngine();
 [DllImport("XLDownload.dll")]
 public static extern int XLGetErrorMsg(int dwErrorId, string pszBuffer, ref int dwSize);

 static void Main(string[] args)
 {
  if (!XLInitDownloadEngine())
  {
  Console.WriteLine("下载引擎初始化错误");
  return;
  }

  Int32 lTaskId = 0;
  string filename = "d://xx.exe";
  string url = "http://xmp.down.sandai.net/kankan/XMPSetup_3.8.1.485-www.exe";
  string refurl = "http://xmp.down.sandai.net";
  int dwRet = XLURLDownloadToFile(filename, url, refurl, ref lTaskId);
  if (XL_SUCCESS != dwRet)
  {
  XLUninitDownloadEngine();
  Console.WriteLine("添加新任务失败");
  return;
  }
  Console.WriteLine("开始下载");
  do
  {
  Thread.Sleep(1000);
  double pullFileSize = 0;
  double pullRecvSize = 0;
  int lStatus = -1;
  dwRet = XLQueryTaskInfo(lTaskId, ref lStatus, ref pullFileSize, ref pullRecvSize);
  if (XL_SUCCESS == dwRet)
  {
   if ((int)enumTaskStatus.enumTaskStatus_Success == lStatus)
   {
   Console.WriteLine("下载完成");
   break;
   }
   if (0 != pullFileSize)
   {
   double douProcess = (double)pullRecvSize / (double)pullFileSize;
   douProcess *= 100.0;
   Console.WriteLine("下载进度：{0}%", douProcess);
   }
   else
   {
   Console.WriteLine("文件长度为0");
   }

  }
  } while (XL_SUCCESS == dwRet);
  XLStopTask(lTaskId);
  XLUninitDownloadEngine();
 }
 }
}