WPF(C#)如何使用post请求传输文件？
发布时间：2020-12-15 21:42:24 所属栏目：百科 来源：网络整理
导读：我有一个以字节数组的形式呈现的图片.我需要将其保存到文件并发送帖子请求.告诉我如何做得更好 这就是我的工作 private Stream file; public void Fun1() { using (file = IsolatedStorageHelper.OpenFile(Picture,FileMode.Create)) { file.Write(bt,bt.Len
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我有一个以字节数组的形式呈现的图片.我需要将其保存到文件并发送帖子请求.告诉我如何做得更好
这就是我的工作 private Stream file;
public void Fun1()
{
using (file = IsolatedStorageHelper.OpenFile(Picture,FileMode.Create))
{
file.Write(bt,bt.Length);
_cookies = DataHolder.Instance.Cookies;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(String.Concat("http:// Mysite.com/image.php?image=FILE",file));
request.Method = "POST";
request.ContentType = "multipart/form-data";
request.CookieContainer = _cookies;
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallbackPlayersfun1),request);
}
}
private void GetRequestStreamCallbackPlayersfun1(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
Stream postStream = request.EndGetRequestStream(asynchronousResult);
using (file = IsolatedStorageHelper.OpenFile(Picture,FileMode.Open))
{
BinaryReader br = new BinaryReader(file,Encoding.UTF8);
byte[] buffer = br.ReadBytes(2048);
while (buffer.Length > 0)
{
postStream.Write(buffer,buffer.Length);
buffer = br.ReadBytes(2048);
}
}
postStream.Close();
request.BeginGetResponse(new AsyncCallback(ReadCallbackSavePlayersfun1),request);
}
private void ReadCallbackSavePlayersfun1(IAsyncResult asynchronousResult)
{
lock (__SYNC)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
}
}
结果,服务器没有来,告诉我我做错了什么 感谢您的回复. 但我有另一个问题.我的图片以字符串编码,我写入流中的字符串并尝试发送到服务器.作为回应,一切都很好,但请求的类型是“获取”(变量响应,方法ReadCallbackSavePlayersfun1).请告诉我出了什么问题 public void Fun1()
{
string str = "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAA";
using (file = IsolatedStorageHelper.OpenFile(Picture,FileMode.Create))
{
StreamWriter w = new StreamWriter(file,Encoding.UTF8);
w.WriteLine(str);
_cookies = DataHolder.Instance.Cookies;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(String.Concat("http://Mysite.com/image.php"));
string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x",CultureInfo.InvariantCulture);
request.Method = "POST";
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.CookieContainer = _cookies;
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallbackPlayersfun1),request);
w.Close();
}
}
private void GetRequestStreamCallbackPlayersfun1(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
Stream postStream = request.EndGetRequestStream(asynchronousResult);
string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x",CultureInfo.InvariantCulture);
var sbHeader = new StringBuilder();
if (file != null)
{
sbHeader.AppendFormat("--{0}rn",boundary);
sbHeader.AppendFormat("Content-Disposition: form-data; name="{0}"; filename="{1}"rn","picture",file);
sbHeader.AppendFormat("Content-Type: {0}rnrn",request.ContentType);
}
using (file = IsolatedStorageHelper.OpenFile(Picture,FileMode.Open))
{
byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString());
byte[] footer = Encoding.UTF8.GetBytes("rn--" + boundary + "--rn");
long contentLength = header.Length + (file != null ? file.Length : 0) + footer.Length;
postStream.Write(header,header.Length);
if (file != null)
{
BinaryReader br = new BinaryReader(file,Encoding.UTF8);
byte[] buffer = br.ReadBytes(2048);
while (buffer.Length > 0)
{
postStream.Write(buffer,buffer.Length);
buffer = br.ReadBytes(2048);
}
br.Close();
}
postStream.Write(footer,footer.Length);
postStream.Flush();
postStream.Close();
}
request.BeginGetResponse(new AsyncCallback(ReadCallbackSavePlayersfun1),request);
}
private void ReadCallbackSavePlayersfun1(IAsyncResult asynchronousResult)
{
lock (__SYNC)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
try
{
String doc = "";
using (Stream streamResponse = response.GetResponseStream())
{
Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
StreamReader readStream = new StreamReader(streamResponse,encode);
Char[] read = new Char[256];
int count = readStream.Read(read,256);
while (count > 0)
{
String str = new String(read,count);
doc += str;
count = readStream.Read(read,256);
}
}
}
catch
{ }
}
}
解决方法
在.Net中发布web byte []数据并不那么简单.将byte []保存到存储很容易,因此我没有代码,但这是我用来发布二进制数据的方法.
这最初来自http://skysanders.net/subtext/archive/2010/04/12/c-file-upload-with-form-fields-cookies-and-headers.aspx,我的修改适合 要获取FileInfo,只需传入即可 new FileInfo(fullPath) 祝好运 ： ) /// <summary>
/// Create a new HttpWebRequest with the default properties for HTTP POSTS
/// </summary>
/// <param name="url">The URL to be posted to</param>
/// <param name="referer">The refer</param>
/// <param name="cookies">CookieContainer that should be used in this request</param>
/// <param name="postData">The post data</param>
private string CreateHttpWebUploadRequest(string url,string referer,CookieContainer cookies,NameValueCollection postData,FileInfo fileData,string fileContentType)
{
var request = (HttpWebRequest)HttpWebRequest.Create(url);
string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x",CultureInfo.InvariantCulture);
// set the request variables
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.CookieContainer = cookies;
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML,like Gecko) Chrome/5.0.375.55 Safari/533.4";
request.Accept = "image/gif,image/jpeg,image/pjpeg,*/*";
request.Headers.Add("Accept-Encoding: gzip,deflate");
request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
request.Headers.Add("Accept-Language: en-us");
request.Referer = referer;
request.KeepAlive = true;
request.AllowAutoRedirect = false;
// process through the fields
var sbHeader = new StringBuilder();
// add form fields,if any
if (postData != null)
{
foreach (string key in postData.AllKeys)
{
string[] values = postData.GetValues(key);
if (values != null)
{
foreach (string value in values)
{
if (!string.IsNullOrEmpty(value))
sbHeader.AppendFormat("--{0}rn",boundary);
sbHeader.AppendFormat("Content-Disposition: form-data; name="{0}";rnrn{1}rn",key,value);
}
}
}
}
if (fileData != null)
{
sbHeader.AppendFormat("--{0}rn","media",fileData.Name);
sbHeader.AppendFormat("Content-Type: {0}rnrn",fileContentType);
}
byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString());
byte[] footer = Encoding.UTF8.GetBytes("rn--" + boundary + "--rn");
long contentLength = header.Length + (fileData != null ? fileData.Length : 0) + footer.Length;
// set content length
request.ContentLength = contentLength;
// ref https://stackoverflow.com/questions/2859790/the-request-was-aborted-could-not-create-ssl-tls-secure-channel
// avoid The request was aborted: Could not create SSL/TLS secure channel exception
ServicePointManager.Expect100Continue = false;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;
using (var requestStream = request.GetRequestStream())
{
requestStream.Write(header,header.Length);
// write the uploaded file
if (fileData != null)
{
// write the file data,if any
byte[] buffer = new Byte[fileData.Length];
var bytesRead = fileData.OpenRead().Read(buffer,(int)(fileData.Length));
requestStream.Write(buffer,bytesRead);
}
// write footer
requestStream.Write(footer,footer.Length);
requestStream.Flush();
requestStream.Close();
using (var response = request.GetResponse() as HttpWebResponse)
using (var stIn = new System.IO.StreamReader(response.GetResponseStream()))
{
return stIn.ReadToEnd();
}
}
}
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