目前只支持HTTP协议

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HTTPpublic 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();}}
}