上传永久素材（图片，视频）
using System.Web.Mvc; using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Text; using System.Web; namespace BoldSeas.WeChat.UI.OpenApi.Controllers { public class HomeController : BaseController { // // GET: /Home/ public ActionResult Index() { string localPath = Path.GetFullPath("D:\\3.jpg"); string accessToken = "--"; string result = UploadVideo.GetUploadVideoResult(accessToken, localPath, "标题", "描述"); //Response.Write(result); return Json(result); } } public static class UploadVideo { public static string GetUploadVideoResult(string accessToken, string filePath, string title, string introduction) { var url = string.Format("https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={0}", accessToken); var fileDictionary = new Dictionary<string, string>(); fileDictionary["media"] = filePath; fileDictionary["description"] = string.Format("{{\"title\":\"{0}\", \"introduction\":\"{1}\"}}", title, introduction); string returnText = string.Empty; Dictionary<string, string> postDataDictionary = null; using (MemoryStream ms = new MemoryStream()) { postDataDictionary.FillFormDataStream(ms); //填充formData returnText = HttpPost(url, null, ms, fileDictionary, null, null, 1200000); } return returnText; } /// <summary> /// 填充表单信息的Stream /// </summary> /// <param name="formData"></param> /// <param name="stream"></param> public static void FillFormDataStream(this Dictionary<string, string> formData, Stream stream) { string dataString = GetQueryString(formData); var formDataBytes = formData == null ? new byte[0] : Encoding.UTF8.GetBytes(dataString); stream.Write(formDataBytes, 0, formDataBytes.Length); stream.Seek(0, SeekOrigin.Begin);//设置指针读取位置 } /// <summary> /// 组装QueryString的方法 /// 参数之间用&连接，首位没有符号，如：a=1&b=2&c=3 /// </summary> /// <param name="formData"></param> /// <returns></returns> public static string GetQueryString(this Dictionary<string, string> formData) { if (formData == null || formData.Count == 0) { return ""; } StringBuilder sb = new StringBuilder(); var i = 0; foreach (var kv in formData) { i++; sb.AppendFormat("{0}={1}", kv.Key, kv.Value); if (i < formData.Count) { sb.Append("&"); } } return sb.ToString(); } /// <summary> /// 根据完整文件路径获取FileStream /// </summary> /// <param name="fileName"></param> /// <returns></returns> public static FileStream GetFileStream(string fileName) { FileStream fileStream = null; if (!string.IsNullOrEmpty(fileName) && File.Exists(fileName)) { fileStream = new FileStream(fileName, FileMode.Open); } return fileStream; } /// <summary> /// 使用Post方法获取字符串结果 /// </summary> /// <param name="url"></param> /// <param name="cookieContainer"></param> /// <param name="postStream"></param> /// <param name="fileDictionary">需要上传的文件，Key：对应要上传的Name，Value：本地文件名</param> /// <param name="timeOut">超时</param> /// <returns></returns> public static string HttpPost(string url, CookieContainer cookieContainer = null, Stream postStream = null, Dictionary<string, string> fileDictionary = null, string refererUrl = null, Encoding encoding = null, int timeOut = 1200000) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.Timeout = timeOut; #region 处理Form表单文件上传 var formUploadFile = fileDictionary != null && fileDictionary.Count > 0;//是否用Form上传文件 if (formUploadFile) { //通过表单上传文件 postStream = postStream ?? new MemoryStream(); string boundary = "----" + DateTime.Now.Ticks.ToString("x"); //byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); string fileFormdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n"; string dataFormdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}"; foreach (var file in fileDictionary) { try { var fileName = file.Value; //准备文件流 using (var fileStream = GetFileStream(fileName)) { string formdata = null; if (fileStream != null) { //存在文件 formdata = string.Format(fileFormdataTemplate, file.Key, /*fileName*/ Path.GetFileName(fileName)); } else { //不存在文件或只是注释 formdata = string.Format(dataFormdataTemplate, file.Key, file.Value); } //统一处理 var formdataBytes = Encoding.UTF8.GetBytes(postStream.Length == 0 ? formdata.Substring(2, formdata.Length - 2) : formdata);//第一行不需要换行 postStream.Write(formdataBytes, 0, formdataBytes.Length); //写入文件 if (fileStream != null) { byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { postStream.Write(buffer, 0, bytesRead); } } } } catch (Exception ex) { throw ex; } } //结尾 var footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); postStream.Write(footer, 0, footer.Length); request.ContentType = string.Format("multipart/form-data; boundary={0}", boundary); } else { request.ContentType = "application/x-www-form-urlencoded"; } #endregion request.ContentLength = postStream != null ? postStream.Length : 0; request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"; request.KeepAlive = true; if (!string.IsNullOrEmpty(refererUrl)) { request.Referer = refererUrl; } request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36"; if (cookieContainer != null) { request.CookieContainer = cookieContainer; } #region 输入二进制流 if (postStream != null) { postStream.Position = 0; //直接写入流 Stream requestStream = request.GetRequestStream(); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = postStream.Read(buffer, 0, buffer.Length)) != 0) { requestStream.Write(buffer, 0, bytesRead); } //debug postStream.Seek(0, SeekOrigin.Begin); StreamReader sr = new StreamReader(postStream); var postStr = sr.ReadToEnd(); postStream.Close();//关闭文件访问 } #endregion HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if (cookieContainer != null) { response.Cookies = cookieContainer.GetCookies(response.ResponseUri); } using (Stream responseStream = response.GetResponseStream()) { using (StreamReader myStreamReader = new StreamReader(responseStream, encoding ?? Encoding.GetEncoding("utf-8"))) { string retString = myStreamReader.ReadToEnd(); return retString; } } } } }
上传微信永久素材图片 //请求头部信息media
using System; using System.IO; using System.Net; using System.Text; using System.Web; namespace BoldSeas.WeChat.Common.Rest { public static class HttpUploadFile { public static string HttpUploadImgFile(string url, HttpPostedFileBase upImg) { // 设置参数 var request = WebRequest.Create(url) as HttpWebRequest; request.CookieContainer = new CookieContainer(); request.AllowAutoRedirect = true; request.Method = "POST"; string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线 request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary; byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n"); byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); string fileName = upImg.FileName; //请求头部信息 StringBuilder sbHeader = new StringBuilder(string.Format( "Content-Disposition:form-data;name=\"media\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName)); byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString()); Stream fs = upImg.InputStream; byte[] bArr = new byte[fs.Length]; fs.Read(bArr, 0, bArr.Length); fs.Close(); Stream postStream = request.GetRequestStream(); postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length); postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length); postStream.Write(bArr, 0, bArr.Length); postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length); postStream.Close(); //发送请求并获取相应回应数据 HttpWebResponse response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求 Stream instream = response.GetResponseStream(); using (StreamReader myStreamReader = new StreamReader(instream, Encoding.UTF8)) { string retString = myStreamReader.ReadToEnd(); return retString; } } } }
