How To Use InternetOpen, InternetOpenUrl and InternetReadFile

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C#

.NET

How I Download The WebPage Content Using winInet.dll

Posted 5-Feb-13 0:29am

NeerajGSoft

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Joezer BH 5-Feb-13 7:47am

If you are using C#.NET why use winInet.dll?

NeerajGSoft 5-Feb-13 10:32am

because i worked with httpwebrequest and httpwebresponse classes and it giving me runtime exception "Internal Server Error" at the time of response of url....

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sjelen · Accepted Answer · 2013-02-05T01:19:00

Solution 1

In c# you do not need to use winInet.dll directly, there are several .NET classes you can use:
WebClient[^] is a wrapper around wininet and probably easiest to use.

WebRequest[^] and it's descendents will give you more control over creating requests and processing response.

In your case problem seems to be that you need to handle cookies so the server you're connecting to can use session.
WebClient class does not handle cookies by default but you can extend it:

C#

public class WebClientEx : WebClient
{
    private readonly CookieContainer _Container = new CookieContainer();

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        HttpWebRequest webRequest = request as HttpWebRequest;
        if (webRequest != null)
        {
            webRequest.CookieContainer = _Container;
        }
        return request;
    }
}

and use WebClientEx instead of WebClient.

Posted 5-Feb-13 1:19am

sjelen

Updated 6-Feb-13 1:49am

v4

Comments

NeerajGSoft 5-Feb-13 10:30am

I tried with webrequest but i'm getting "internal server error" @webresponse object....

sjelen 5-Feb-13 12:37pm

You probably didn't make the request right, so the server responded with 'internal server error'.
Maybe you used bad URL, or forgot to authenticate if needed.
The error is not because you used WebRequest class, but because target server could not process your request.

Why don't you try using WebClient.DownloadString method (http://msdn.microsoft.com/en-us/library/fhd1f0sw.aspx)
It will download the page as a string.

Or add a code sample so we can see what you're trying and help you find the problem.

NeerajGSoft 5-Feb-13 22:19pm

url="http://links.casemakerlegal.com/states/MS/books/Case_Law/results?search[Cite]=77 So.3d 1094"
Uri urlCheck = new Uri(url);
WebClient wc = new WebClient();
wc.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
Stream data = wc.OpenRead(urlCheck);
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();

This Is My Code To Make A Request To Server........

sjelen 6-Feb-13 7:18am

See the code in updated answer.

NeerajGSoft 6-Feb-13 23:25pm

thank u....