Does anybody know how to upload to imageshack.us with C#? Two other threads here couldn't help:/
That's my piece of code. "PostParamCollection" is a library for sending HTTP Post. Lots of thanks for any help!
Im getting the error-message: "
Sorry, but we've detected that unexpected data is received. Required parameter 'fileupload' is missing or your post is not multipart/form-data
"
String imageshackurl = "http://www.imageshack.us/upload_api.php?";
PostParamCollection postParamCollection = new PostParamCollection();
postParamCollection.Add(new PostParam("key", imageshack_key));
postParamCollection.Add(new PostParam("Content-Disposition", "form-data"));
postParamCollection.Add(new PostParam("filename", "a.jpg"));
postParamCollection.Add(new PostParam("Content-Type", "image/png"));
HttpPost httpPost = new HttpPost(imageshackurl);
httpPost.doPost(postParamCollection);
String link = httpPost.responseStream;
WriteLog(link);
You don't appear to be adding a fileupload parameter to your postParamCollection, which, I assume, would need to be of type byte[] and contain the file's contents.
I see that PostParam uses strings for its name and value, which is unsuitable for submitting binary data, such as an image file. Unfortunately, you will need to use a different method for posting the data to ImageShack. Take a look at the built-in .NET WebClient class, which should allow you to do this.
Related
I have the following line of aspx link that I would like to encode:
Response.Redirect("countriesAttractions.aspx?=");
I have tried the following method:
Response.Redirect(Encoder.UrlPathEncode("countriesAttractions.aspx?="));
This is another method that I tried:
var encoded = Uri.EscapeUriString("countriesAttractions.aspx?=");
Response.Redirect(encoded);
Both redirects to the page without the URL being encoded:
http://localhost:52595/countriesAttractions?=
I tried this third method:
Response.Redirect(Server.UrlEncode("countriesAttractions.aspx?="));
This time the url itself gets encoded:
http://localhost:52595/countriesAttractions.aspx%3F%3D
However I get an error from the UI saying:
HTTP Error 404.0 Not Found
The resource you are looking for has been removed, had its name changed, or
is temporarily unavailable.
Most likely causes:
-The directory or file specified does not exist on the Web server.
-The URL contains a typographical error.
-A custom filter or module, such as URLScan, restricts access to the file.
Also, I would like to encode another kind of URL that involves parsing of session strings:
Response.Redirect("specificServices.aspx?service=" +
Session["service"].ToString().Trim() + "&price=" +
Session["price"].ToString().Trim()));
The method I tried to include the encoding method into the code above:
Response.Redirect(Server.UrlEncode("specificServices.aspx?service=" +
Session["service"].ToString().Trim() + "&price=" +
Session["price"].ToString().Trim()));
The above encoding method I used displayed the same kind of results I received with my previous Server URL encode methods. I am not sure on how I can encode url the correct way without getting errors.
As well as encoding URL with CommandArgument:
Response.Redirect("specificAttractions.aspx?attraction=" +
e.CommandArgument);
I have tried the following encoding:
Response.Redirect("specificAttractions.aspx?attraction=" +
HttpUtility.HtmlEncode(Convert.ToString(e.CommandArgument)));
But it did not work.
Is there any way that I can encode the url without receiving this kind of error?
I would like the output to be something like my second result but I want to see the page itself and not the error page.
I have tried other methods I found on stackoverflow such as self-coded methods but those did not work either.
I am using AntiXSS class library in this case for the methods I tried, so it would be great if I can get solutions using AntiXSS library.
I need to encode URL as part of my school project so it would be great if I can get solutions. Thank you.
You can use the UrlEncode or UrlPathEncode methods from the HttpUtility class to achieve what you need. See documentation at https://msdn.microsoft.com/en-us/library/system.web.httputility.urlencode(v=vs.110).aspx
It's important to understand however, that you should not need to encode the whole URL string. It's only the parameter values - which may contain arbitrary data and characters which aren't valid in a URL - that you need to encode.
To explain this concept, run the following in a simple .NET console application:
string url = "https://www.google.co.uk/search?q=";
//string url = "http://localhost:52595/specificAttractions.aspx?country=";
string parm = "Bora Bora, French Polynesia";
Console.WriteLine(url + parm);
Console.WriteLine(url + HttpUtility.UrlEncode(parm), System.Text.Encoding.UTF8);
Console.WriteLine(url + HttpUtility.UrlPathEncode(parm), System.Text.Encoding.UTF8);
Console.WriteLine(HttpUtility.UrlEncode(url + parm), System.Text.Encoding.UTF8);
You'll get the following output:
https://www.google.co.uk/search?q=Bora Bora, French Polynesia
https://www.google.co.uk/search?q=Bora+Bora%2c+French+Polynesia
https://www.google.co.uk/search?q=Bora%20Bora,%20French%20Polynesia
https%3a%2f%2fwww.google.co.uk%2fsearch%3fq%3dBora+Bora%2c+French+Polynesia
By pasting these into a browser and trying to use them, you'll soon see what is a valid URL and what is not.
(N.B. when pasting into modern browsers, many of them will URL-encode automatically for you, if your parameter is not valid - so you'll find the first output works too, but if you tried to call it via some C# code for instance, it would fail.)
Working demo: https://dotnetfiddle.net/gqFsdK
You can of course alter the values you input to anything you like. They can be hard-coded strings, or the result of some other code which returns a string (e.g. fetching from the session, or a database, or a UI element, or anywhere else).
N.B. It's also useful to clarify that a valid URL is simply a string in the correct format of a URL. It is not the same as a URL which actually exists. A URL may be valid but not exist if you try to use it, or may be valid and really exist.
I'm creating a socket application which is able to receive strings from a websocket within a web page. I have been able to successfully connect the Websocket to my C# program but when ever the webpage sends a string to the program it seems to be encrypted or hashed in some way.
For example if the webpage sends "Test" the program would then output "???9uu?\". I'm obviously missing a step here and I'm not sure what I should searching for to resolve this issue. I'm guessing the string has to be decrypted or put trough a specific function with the TCP key in order to get the actual string?
The code below is the section responsible for receiving the strings from the HTML, (Both "Data" and "MyWriter" output the same string):
while (true)
{
CollectedBytes = new byte[128];
stream.Read(CollectedBytes, 0, CollectedBytes.Length);
string Data = Encoding.ASCII.GetString(CollectedBytes, 0, CollectedBytes.Length);
Output.Speak("Message: " + Data);
StringWriter MyWriter = new StringWriter();
HttpUtility.HtmlDecode(Data, MyWriter);
Output.Speak("Message: " + MyWriter.ToString());
// The word "Test" should output here
// But instead "???9uu?\" is.
}
I'm assuming that I'm missing a simple step but I've looked everywhere and can't seem to find anything to help me!! If anyone can give me guidance on what I should do that would be great :)
Thanks in advance.
Are you trying to decode data manually without using any WebSocket library? If so, you must know that the payload part of WebSocket frames from clients is masked. See RFC 6455, 5.3. Client-to-Server Masking.
So I tried this in several different formats and produced different results. I will include all relevant information below.
My company uses a web-based application to schedule the generation of reports. The service emails a URL that can be clicked on and will immediately begin the "Open Save As Cancel" dialogue box. I am trying to automate the process of downloading these reports with a C# script as part of a Visual Studio project (the end goal is to import these reports in SQL Server).
I am encountering terrible difficulty initiating the download of this file using WebClient Here is the closest I have gotten with any of the methods I have tried:
*NOTE: I removed all identifying information from the URL, but left all special characters and the basic architecture intact. Hopefully this will be a happy medium between protecting confidential info and giving you enough to understand my dilemma. The URL does work when manually copied and pasted into the address bar of internet explorer.
Error Message:
"Invalid URI: The hostname could not be parsed."
public void Main()
{
using (var wc = new System.Net.WebClient())
{
wc.DownloadFile(
new Uri(#"http:\\webapp.locality.company.com\scripts\rds\cgigetf.exe?job_id=3058352&file_id=1&format=TAB\report.tab"),
#"\\server\directory\folder1\folder2\folder3\...\...\...\rawfile.tab");
}
}
Note also that I have tried to set:
string sourceUri = #"http:\\webapp.locality.company.com\scripts\rds\cgigetf.exe?job_id=3058352&file_id=1&format=TAB\report.tab\abc123_3058352.tab";
Uri uriPath;
Uri.TryCreate(sourceUri, UriKind.Absolute, out uriPath);
But uriPath remains null - TryCreate fails.
I have attempted doing a webrequest / webresponse / WebStream, but it still cannot find the host.
I have tried including the download URL (as in my first code example) and the download URL + the file name (as in my second code example). I do not need the file name in the URL to initiate the download if I do it manually. I have also tried replacing the "report.tab" portion of the URL with the file name, but to no avail.
Help is greatly appreciated as I have simply run out of thoughts on this one. The only idea I have left is that perhaps one of the special characters in my URL is getting in the way, but I don't know which one that would be or how to handle it properly.
Thanks in advance!
My first thought would be that your URI backslashes are being interpreted as escape characters, leading to a nonsense result after evaluation. I would try a quick test where each backslash is escaped as itself (i.e. "\" instead of "\" in each instance). I'm also a little puzzled as to why your URI is not using forward slashes...?
// Create an absolute Uri from a string.
Uri absoluteUri = new Uri("http://www.contoso.com/");
Ref: Uri Constructor on MSDN
I am just trying to write a multipart parser but things getting complicated and want to ask if anyone knows of a ready parser in C#!
Just to make clear, I am writing my own "tiny" http server and need to pars multipart form-data too!
Thanks in advance,
Gohlool
I open-sourced a C# Http form parser here.
This is slightly more flexible than the other one mentioned which is on CodePlex, since you can use it for both Multipart and non-Multipart form-data, and also it gives you other form parameters formatted in a Dictionary object.
This can be used as follows:
non-multipart
public void Login(Stream stream)
{
string username = null;
string password = null;
HttpContentParser parser = new HttpContentParser(stream);
if (parser.Success)
{
username = HttpUtility.UrlDecode(parser.Parameters["username"]);
password = HttpUtility.UrlDecode(parser.Parameters["password"]);
}
}
multipart
public void Upload(Stream stream)
{
HttpMultipartParser parser = new HttpMultipartParser(stream, "image");
if (parser.Success)
{
string user = HttpUtility.UrlDecode(parser.Parameters["user"]);
string title = HttpUtility.UrlDecode(parser.Parameters["title"]);
// Save the file somewhere
File.WriteAllBytes(FILE_PATH + title + FILE_EXT, parser.FileContents);
}
}
I've had some issues with parser that are based on string parsing particularly with large files I found it would run out of memory and fail to parse binary data.
To cope with these issues I've open sourced my own attempt at a C# multipart/form-data parser here
See my answer here for more information.
Check out the new MultipartStreamProvider and its subclasses (i.e. MultipartFormDataStreamProvider). You can create your own implementation too if none of the built in implementations are suitable for you use case.
With Core now you have access to a IFormCollection by using HttpContext.Request.Form.
Example saving an image:
Microsoft.AspNetCore.Http.IFormCollection form;
form = ControllerContext.HttpContext.Request.Form;
using (var fileStream = System.IO.File.Create(strFile))
{
form.Files[0].OpenReadStream().Seek(0, System.IO.SeekOrigin.Begin);
form.Files[0].OpenReadStream().CopyTo(fileStream);
}
I had a similar problem that i recently solved thanks to Anthony over at http://antscode.blogspot.com/ for the multipart parser.
Uploading file from Flex to WCF REST Stream issues (how to decode multipart form post in REST WS)
I have to interface with a slightly archaic system that doesn't use webservices. In order to send data to this system, I need to post an XML document into a form on the other system's website. This XML document can get very large so I would like to compress it.
The other system sits on IIS and I use C# my end. I could of course implement something that compresses the data before posting it, but that requires the other system to change so it can decompress the data. I would like to avoid changing the other system as I don't own it.
I have heard vague things about enabling compression / http 1.1 in IIS and the browser but I have no idea how to translate that to my program. Basically, is there some property I can set in my program that will make my program automatically compress the data that it is sending to IIS and for IIS to seamlessly decompress it so the receiving app doesn't even know the difference?
Here is some sample code to show roughly what I am doing;
private static void demo()
{
Stream myRequestStream = null;
Stream myResponseStream = null;
HttpWebRequest myWebRequest = (HttpWebRequest)System.Net
.WebRequest.Create("http://example.com");
byte[] bytMessage = null;
bytMessage = Encoding.ASCII.GetBytes("data=xyz");
myWebRequest.ContentLength = bytMessage.Length;
myWebRequest.Method = "POST";
// Set the content type as form so that the data
// will be posted as form
myWebRequest.ContentType = "application/x-www-form-urlencoded";
//Get Stream object
myRequestStream = myWebRequest.GetRequestStream();
//Writes a sequence of bytes to the current stream
myRequestStream.Write(bytMessage, 0, bytMessage.Length);
//Close stream
myRequestStream.Close();
WebResponse myWebResponse = myWebRequest.GetResponse();
myResponseStream = myWebResponse.GetResponseStream();
}
"data=xyz" will actually be "data=[a several MB XML document]".
I am aware that this question may ultimately fall under the non-programming banner if this is achievable through non-programmatic means so apologies in advance.
I see no way to compress the data on one side and receiving them uncompressed on the other side without actively uncompressing the data..
No idea if this will work since all of the examples I could find were for download, but you could try using gzip to compress the data, then set the Content-Encoding header on the outgoing message to gzip. I believe that the Length should be the length of the zipped message, although you may want to play with making it the length of the unencoded message if that doesn't work.
Good luck.
EDIT I think the issue is whether the ISAPI filter that supports compression is ever/always/configurably invoked on upload. I couldn't find an answer to that so I suspect that the answer is never, but you won't know until you try (or find the answer that eluded me).