傢伙,首先感謝您的貢獻,我在這裏找到了很好的迴應。然而,我遇到了一個我無法解決的問題,如果有人能提供任何幫助,我們將不勝感激。如何模擬瀏覽器文件上傳與HttpWebRequest
我正在用C#開發這個應用程序,可以將圖像從計算機上傳到用戶photoblog。爲此,我想爲主要用PHP編寫的photoblogs平臺pixelpost。
我在這裏和其他網頁上搜索過,但在那裏提供的實例並沒有爲我工作。 (Upload files with HTTPWebrequest (multipart/form-data)) 和 (http://bytes.com/topic/c-sharp/answers/268661-how-upload-file-via-c-code) 一旦準備就緒,我將在互聯網上免費提供它,也許還會創建它的Windows移動版本,因爲我是一個pixelpost的粉絲。
這裏是我使用的代碼:
string formUrl = "http://localhost/pixelpost/admin/index.php?x=login";
string formParams = string.Format("user={0}&password={1}", "user-String", "password-String");
string cookieHeader;
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(formUrl);
req.ContentType = "application/x-www-form-urlencoded";
req.Method = "POST";
req.AllowAutoRedirect = false;
byte[] bytes = Encoding.ASCII.GetBytes(formParams);
req.ContentLength = bytes.Length;
using (Stream os = req.GetRequestStream())
{
os.Write(bytes, 0, bytes.Length);
}
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
cookieHeader = resp.Headers["Set-Cookie"];
string pageSource;
using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
{
pageSource = sr.ReadToEnd();
Console.WriteLine();
}
string getUrl = "http://localhost/pixelpost/admin/index.php";
HttpWebRequest getRequest = (HttpWebRequest)HttpWebRequest.Create(getUrl);
getRequest.Headers.Add("Cookie", cookieHeader);
HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse();
using (StreamReader sr = new StreamReader(getResponse.GetResponseStream()))
{
pageSource = sr.ReadToEnd();
}
// end first part: login to admin panel
long length = 0;
string boundary = "----------------------------" +
DateTime.Now.Ticks.ToString("x");
HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create("http://localhost/pixelpost/admin/index.php?x=save");
httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary;
httpWebRequest2.Method = "POST";
httpWebRequest2.AllowAutoRedirect = false;
httpWebRequest2.KeepAlive = false;
httpWebRequest2.Credentials = System.Net.CredentialCache.DefaultCredentials;
httpWebRequest2.Headers.Add("Cookie", cookieHeader);
Stream memStream = new System.IO.MemoryStream();
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
string formitem = string.Format(formdataTemplate, "headline", "image-name");
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
memStream.Write(formitembytes, 0, formitembytes.Length);
memStream.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
string header = string.Format(headerTemplate, "userfile", "path-to-the-local-file");
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream("path-to-the-local-file", FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
fileStream.Close();
httpWebRequest2.ContentLength = memStream.Length;
Stream requestStream = httpWebRequest2.GetRequestStream();
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
WebResponse webResponse2 = httpWebRequest2.GetResponse();
Stream stream2 = webResponse2.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
Console.WriteLine(reader2.ReadToEnd());
webResponse2.Close();
httpWebRequest2 = null;
webResponse2 = null;
而且這裏是PHP: (http://dl.dropbox.com/u/3149888/index.php) 和 (http://dl.dropbox.com/u/3149888/new_image.php)
必填字段是標題和 userfile所以我找不出錯誤在哪裏,正如發送的格式正確。我猜測發送到表單的八位字節流有問題。 也許這是一個愚蠢的錯誤,我無法追查,無論如何,如果你能幫助我,這將意味着很多。
感謝,
登錄是否正常工作,您收回cookie嗎? – 2010-05-08 23:49:51
什麼是沒有關於它的工作? – 2010-05-08 23:50:17
是的,登錄工作一切正常。我找回cookie,如果我在控制檯中顯示pageSource字符串,在「//結束第一部分:登錄到管理面板」之前,它包含管理面板的HTML代碼。對於第二個請求,當我發送所有表單數據和文件八位字節流時,我只能將標題設置爲'image-name'的「Submit」頁面取回HTML,並且沒有圖像上傳到博客。 所以,基本上我無法上傳圖像。通常,如果出現問題,我應該收到一條錯誤消息,而不是使用設置了標題的HTML。 – cucicov 2010-05-09 07:53:49