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我一直在創建下載管理器,它接收來自chrome擴展的文件名和下載鏈接。
在這種情況下,我決定使用javascript後臺頁面發送XMLHttpRequest到環回,並創建簡單的服務器來接收消息的背景頁面是這樣的。無法從HttpListenerRequest讀取InputStream
background.js
function showMessageBox(info, tab) {
var link = decodeURIComponent(info.linkUrl);
var index = link.search(/[^/\\\?]+\.\w{3,4}(?=([\?&].*$|$))/);
var fileName = link.substring(index);
alert("will download from " + link + " soon\n File name : " + fileName);
SendMessage(fileName,link);
}
function SendMessage(fileName, link) {
var xhr = new XMLHttpRequest();
xhr.open("POST","http://localhost:6230", false);
xhr.setRequestHeader("Content-Type", "application/json; charset=UTF-8");
var JSONstring = JSON.stringify({ FileName: fileName, DownloadLink: link });
xhr.send(JSONstring);
}
和服務器的一部分。
private void StartReciever()
{
while (true)
{
var fileInfo = GetFileInfo();
Execute.OnUIThread(() => WindowManager.ShowDialog(
new NewDownloadViewModel(WindowManager, EventAggregator, fileInfo, Engine)));
}
}
private FileInfo GetFileInfo()
{
using (var listener = new HttpListener())
{
listener.Prefixes.Add("http://localhost:6230/");
listener.Start();
var requestContext = listener.GetContext();
/*var streamReader = new StreamReader(requestContext.Request.InputStream, requestContext.Request.ContentEncoding);
string jsonString = streamReader.ReadToEnd();*/
var stream = requestContext.Request.InputStream;
byte[] buffer = new byte[10240];
var readbyte = stream.Read(buffer, 0, 102400);
string ss = Encoding.UTF8.GetString(buffer, 0, readbyte);
// deserialize string to object
return new FileInfo();
}
}
我想知道爲什麼流發送消息發送時總是返回0。