如何使用HttpWebRequest模拟浏览器文件上传 [英] How to simulate browser file upload with HttpWebRequest
问题描述
伙计们，首先感谢您的贡献，我在这里找到了不错的答复.但是我遇到了一个我无法解决的问题，如果有人可以提供任何帮助，将不胜感激.
guys, first of all thanks for your contributions, I've found great responses here. Yet I've ran into a problem I can't figure out and if someone could provide any help, it would be greatly appreciated.
我正在用C#开发此应用程序，该应用程序可以将图像从计算机上传到用户photoblog.为此，我使用主要使用PHP编写的photoblog平台 pixelpost 平台.
I'm developing this application in C# that could upload an image from computer to user photoblog. For this I'm usig pixelpost platform for photoblogs that is written mainly in PHP.
我已经在这里和其他网页上进行了搜索，但是在那里提供的示例对我来说不起作用. 这是我在示例中使用的内容:(使用HTTPWebrequest上载文件(multipart/form -data)) 和 ( http://bytes.com /topic/c-sharp/answers/268661-how-upload-file-via-c-code ) 准备好后，由于我是pixelpost的粉丝，因此我将在Internet上免费提供它，也许还会创建它的Windows Mobile版本.
I've searched here and on other web pages, but the exmples provided there didn't work for me. Here is what I used in my example: (Upload files with HTTPWebrequest (multipart/form-data)) and (http://bytes.com/topic/c-sharp/answers/268661-how-upload-file-via-c-code) Once it is ready I will make it available for free on the internet and maybe also create a windows mobile version of it, since I'm a fan of pixelpost.
这是我使用的代码:
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;
，这里还有PHP: ( http://dl.dropbox.com/u/3149888/index.php) 和 ( http://dl.dropbox.com/u/3149888/new_image.php)
and also here is the PHP: (http://dl.dropbox.com/u/3149888/index.php) and (http://dl.dropbox.com/u/3149888/new_image.php)
必填字段为标题和用户文件，因此我无法确定错误的出处，因为格式正确.我猜发送到表单的八位字节流有问题. 也许这是一个愚蠢的错误，无论如何，如果您能帮助我，那将是非常重要的.
the mandatory fields are headline and userfile so I can't figure out where the mistake is, as the format sent in right. I'm guessing there is something wrong with the octet-stream sent to the form. Maybe it's a stupid mistake I wasn't able to trace, in any case, if you could help me that would mean a lot.
谢谢
推荐答案
因此Martin在这里帮助了我，我能够对上面的代码进行重要的更改，以使其正常工作. Content-Type必须更改为image/jpeg.我也使用C#图像类型发送图像流.
So Martin helped me out here and I was able to make the important changes to the code above in order for it to work properly. The Content-Type had to be changed to image/jpeg. Also I used C# Image type to send image stream.
还要注意Stream格式，因为它不必包含多余的空格或换行.
Also pay attention to the Stream format, as it does not have to contain extra spaces or new lines.
这是更改的部分:
string formUrl = "http://localhost/pixelpost/admin/index.php?x=login";
string formParams = string.Format("user={0}&password={1}", "username", "password");
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();
}
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();
}
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);
string headerTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: image/jpeg\r\n\r\n";
string header = string.Format(headerTemplate, "userfile", "Sunset.jpg");
byte[] headerbytes = System.Text.Encoding.ASCII.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
Image img = null;
img = Image.FromFile("C:/Documents and Settings/Dorin Cucicov/My Documents/My Pictures/Sunset.jpg", true);
img.Save(memStream, System.Drawing.Imaging.ImageFormat.Jpeg);
memStream.Write(boundarybytes, 0, boundarybytes.Length);
string formdataTemplate = "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
string formitem = string.Format(formdataTemplate, "headline", "Sunset");
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
memStream.Write(formitembytes, 0, formitembytes.Length);
memStream.Write(boundarybytes, 0, boundarybytes.Length);
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;
再次感谢大家回答或阅读.
Thank you all again for answering or just reading.
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