Re: RtlSetProcessIsCritical, Marshall and pointers. - C# Discussion Boards

reading weather.com data feed

19-Jul-10 7:04

Pete O'Hanlon wrote:
so now I know nothing about anything.

However you succeed rather well at hiding that. Laugh | :laugh:

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

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Jassim Rahma19-Jul-10 5:07

Jassim Rahma

19-Jul-10 5:07

I have come across this artice:

g Returned XML with C#

and I want to know what's the best way from the listed ways to read weather.com weather xml data feed using C#?

Re: reading weather.com data feed

Eddy Vluggen19-Jul-10 5:20

Eddy Vluggen

19-Jul-10 5:20

jrahma wrote:
I want to know what's the best way

According to the article that you're linking to;

"The simplest way to view the returned data is to get the response stream and put it into a string."

I'd say the simplest approach that works would be the best Smile | :)

I are Troll Suspicious | :suss:

Re: reading weather.com data feed

brunoseixas19-Jul-10 6:58

brunoseixas

19-Jul-10 6:58

If the url returns a .xml or .atom you can try read using XmlReader or if you want a full html code, use WebClient.

RtlSetProcessIsCritical, Marshall and pointers.

Night Lol19-Jul-10 4:45

Re: RtlSetProcessIsCritical, Marshall and pointers.

19-Jul-10 4:45

Hi !

I have a big problem, I try to create a parental control (which use the hosts file in windows).
So, I have look the "RtlSetProcessIsCritical" sample code in C/C++. But, I'm a CSharp developer.
My source code is :

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace RtlSetProcessIsCriticalCSharp
{
    unsafe public partial class Form1 : Form
    {
        [DllImport("kernel32.dll")]
        static extern IntPtr LoadLibrary(string dllName);

        [DllImport("kernel32.dll")]
        static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

        delegate long *ProcessIsCriticalDelegate(
        [MarshalAs(UnmanagedType.Bool)]bool bNew, bool *pbOld,
        [MarshalAs(UnmanagedType.Bool)]bool bNeedScb);

        public Form1()
        {
            InitializeComponent();
        }

        unsafe private void Form1_Load(object sender, EventArgs e)
        {
            IntPtr ntdll = LoadLibrary("ntdll.dll");
            IntPtr ProcAdd = GetProcAddress(ntdll, "RtlSetProcessIsCritical");
            ProcessIsCriticalDelegate pcd = (ProcessIsCriticalDelegate)Marshal.GetDelegateForFunctionPointer(ProcAdd, typeof(ProcessIsCriticalDelegate));
            pcd(true, null, false);
        }
    }
}

No error, nothing.

The article about RtlSetProcessIsCritical :

"Protecting" Your Process with RtlSetProcessIsCritical

Can you help me ? Sorry for my bad english, I'm french.

Luc Pattyn19-Jul-10 5:00

Re: RtlSetProcessIsCritical, Marshall and pointers.

19-Jul-10 5:00

Seems you want to call an existing native function. All it takes is a little P/Invoke, there is no need to load libraries, use delegates, and such. You might learn what you need by reading this unfinished article[^] and watching some of its examples.

Smile | :)

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Night Lol19-Jul-10 5:14

Re: RtlSetProcessIsCritical, Marshall and pointers.

19-Jul-10 5:14

        [DllImport("ntdll.dll")]<br />
        unsafe public static extern int RtlSetProcessIsCritical(Boolean bNew, Boolean* pbOld, Boolean bNeedScb);<br />
<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        unsafe private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            RtlSetProcessIsCritical(true, null, false);<br />
        }

Here my new code, but doesn't work... :/

DaveyM6919-Jul-10 5:31

DaveyM69

19-Jul-10 5:31

According to the article, the function is

typedef long ( WINAPI *RtlSetProcessIsCritical ) (
        IN BOOLEAN    bNew, 
        OUT BOOLEAN    *pbOld, 
        IN BOOLEAN    bNeedScb );

Looking at that I think you may have a problem with your second parameter - try:

[DllImport("ntdll.dll")]
public static extern int RtlSetProcessIsCritical(bool bNew, out bool pbOld, bool bNeedScb);

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: RtlSetProcessIsCritical, Marshall and pointers.

Night Lol19-Jul-10 5:51

Re: RtlSetProcessIsCritical, Marshall and pointers.

19-Jul-10 5:51

Doesn't work. And I have the administrator privileges.

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        [DllImport("ntdll.dll", SetLastError = true)]
        unsafe public static extern int RtlSetProcessIsCritical(bool bNew, out bool pbOld, bool bNeedScb);

        public Form1()
        {
            InitializeComponent();
        }

        unsafe private void Form1_Load(object sender, EventArgs e)
        {
            bool outer;
            RtlSetProcessIsCritical(true, out outer, true);
        }
    }
}

DaveyM6919-Jul-10 7:46

DaveyM69

19-Jul-10 7:46

OK - this is interesting so I've done a little more investigation. It seems that the function you are trying to use actually calls ZwSetInformationProcess. This[^] forum thread indicates that it may not be availble on Vista/Weven and is probably not valid on any 64bit OSes. Also, an Administrator account may not be high enough, System privileges may be required. I don't know if any of these apply to you but if so then that could be the reason.

If not, you need to check the error code set by SetLastError and get the relavant error message string.

Dave

If this helped, please vote & accept answer!

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.(Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

Re: RtlSetProcessIsCritical, Marshall and pointers.

Luc Pattyn19-Jul-10 5:33

Re: RtlSetProcessIsCritical, Marshall and pointers.

19-Jul-10 5:33

Night Lol wrote:
but doesn't work...

that is not informative.

what happened to the PRE tags?
did you understand the article you referred to?
does the Win32 function return a status, does it use GetLastError? did you check them?
don't you need to manipulate some privileges?
have you ever used Google on this subject?

Hmmm | :|

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

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Night Lol19-Jul-10 5:52

Unable to reference shared assembly in GAC [modified] Solved

19-Jul-10 5:52

Yes, I have used google.
I have the administrator privileges (In the article, we use SE_DEBUG privilege), I have read some parts of the article.

Jonathan Davies19-Jul-10 2:30

Jonathan Davies

19-Jul-10 2:30

This is from an example in Professional C#2008 from Wrox Chap 17, p491.

Using a VS2008 C# class library project I've created a simple shared assembly. I've used the string name tool to create a name "sn -k mykey.snk" and used the VS Project | Properties | Signing tab to sign the assembly with this key. After building, by using idlview, I can view the key in the manifest. Opening a VS Command prompt to RunAs Administrator I've installed it using "gacutil /i SharedDemo.dll".

But I can't seem to reference it from a VS2008 C# Console Application project. From Solution Explorer I right-click the solution and use Add Reference. I can find the assembly in C:\Windows\assembly using the Add Reference Browse tab but am unable to select it. The book says "... referenced in the same way as a private assembly..."

I'm not trying any Delayed Signing, just to make a compile time reference. I tried starting VS2008 with RunAs Administrator but it made no difference. Any ideas appreciated.

The assembly is in the GAC as shown by:

>gacutil /l SharedDemo
Microsoft (R) .NET Global Assembly Cache Utility.  Version 3.5.21022.8 Copyright (c) Microsoft Corporation.  All rights reserved.

The Global Assembly Cache contains the following assemblies:
  SharedDemo, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c5bbc6da95e06b44, processorArchitecture=MSIL

  Number of items = 1

modified on Monday, July 19, 2010 10:02 AM

Re: Unable to reference shared assembly in GAC

PIEBALDconsult19-Jul-10 3:13

PIEBALDconsult

19-Jul-10 3:13

I think you're doing it wrong. Don't try to reference the assembly in the GAC, just try to reference the assembly in the directory where you created it and the system will figure out the rest. That's what works for me. Your application shouldn't have to know whether or not the assembly is in the GAC.

Re: Unable to reference shared assembly in GAC

Jonathan Davies19-Jul-10 4:02

Jonathan Davies

19-Jul-10 4:02

You seem to be right. In my client console project I referenced the local copy of the shared assembly SharedDemo.dll which I was able to do. But if I rename the local directory the console client still runs OK which must prove it using the shared one in the GAC.
Thanks

HTML Table tag text Scraping

NaveenHS19-Jul-10 0:48

NaveenHS

19-Jul-10 0:48

Hello Everyone,

I have one simple static HTML file, with a table i am trying to extract the contents of the table to a file.

can anyone please give some some suggestions how to proceed with this work.

HTML File:-

<html>
<body>

<table border="1">
<tr>
<th>Team Name</th>
<th>Place</th>
</tr>
<tr>
<td>Kings XI Punjab</td>
<td>Punjab</td>
</tr>
<tr>
<td>Chennai Super Kings</td>
<td>Chennai</td>
</tr>

<tr>
<td>Deccan Chargers</td>
<td>Hydrabad</td>
</tr>

</table>

</body>
</html>

I am trying to extract the text with this code :-

using System.Diagnostics;
using System.Net;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System;
using System.IO;
using System.Linq;

class Program
{
	static void Main()
	{
		StreamReader str = new StreamReader("C:\\Sample1.html");
		string strLings = str.ReadToEnd();
		int startIndex = strLings.IndexOf("<table>");
		int endInedx = strLings.IndexOf("</table>") + "</table>".Length - startIndex;
		string strTab = strLings.Substring(startIndex, endInedx);
		str.Close();
		StreamWriter strWr = new StreamWriter("C:\\test2.txt", true);
		strWr.Write(strTab);
		strWr.Close();
	}
}

Problem is i am getting an error

An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll

Additional information: StartIndex cannot be less than zero.

Luc Pattyn19-Jul-10 0:57

19-Jul-10 0:57

As you already figured out, a table starts and ends with a TABLE tag, holds rows delimited by TR tags, which in turn hold columns delimited by TD tags. You did make two mistakes:
1. tags can be upper- or lower-case in HTML (XHTML requires lower-case);
2. opening tags may contain extra information (see the border='1' attribute in your example).

So code accordingly, either by providing your own GetDelimitedSubstring() method (similar to what you already have), or by using Regex.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

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NaveenHS19-Jul-10 1:45

NaveenHS

19-Jul-10 1:45

Thanks Luc Pattyn for the response.

I corrected the mistakes as follows

HTML File :-

<html>
<body>

<table>
<tr>
<th>Team Name</th>
<th>Place</th>
</tr>
<tr>
<td>Kings XI Punjab</td>
<td>Punjab</td>
</tr>
<tr>

<td>Chennai Super Kings</td>
<td>Chennai</td>
</tr>

<tr>
<td>Deccan Chargers</td>
<td>Hydrabad</td>
</tr>

</table>

</body>

</html>

Program :-

<br />
static void Main()<br />
	{<br />
		StreamReader str = new StreamReader("C:\\Test.html");<br />
		string strLings = str.ReadToEnd();<br />
		int startIndex = strLings.IndexOf("<table>");<br />
		int endInedx = strLings.IndexOf("</table>") + "</table>".Length - startIndex;<br />
		string strTab = strLings.Substring(1, endInedx);<br />
		str.Close();<br />
		StreamWriter strWr = new StreamWriter("C:\\test2.txt", true);<br />
		strWr.Write(strTab);<br />
		strWr.Close();<br />
<br />
		Console.ReadLine();<br />
	}<br />

Getting the output as below written to the file ..
Not getting the required out put .. Frown | :(

I will try with Regular Expression now.

html>
<body>

<table>
<tr>
<th>Team Name</th>
<th>Place</th>
</tr>
<tr>
<td>Kings XI Punjab</td>
<td>Punjab</td>
</tr>
<tr>

<td>Chennai Super Kings</td>
<td>Chennai</td>
</tr>

<tr>
<td>Deccan Chargers</td>
<td>Hydrabad</td>
</tr

Not Active19-Jul-10 5:41

Not Active

19-Jul-10 5:41

Maybe this will help, Screen Scraping with C# for ASP.NET[^]

I know the language. I've read a book. - _Madmatt

ragnaroknrol19-Jul-10 4:04

ragnaroknrol

19-Jul-10 4:04

This question is an example of what every question here should be like.

You posted the problem, gave data on the situation that was relevant, and posted code showing what you had tried. You asked for assistance and you have done a follow up with your new attempt and the results along with your reaction to that result.

I wish every poster in this forum did as well. A well earned 5 and I hope your regex works. I still get headaches from them. Good luck.

If I have accidentally said something witty, smart, or correct, it is purely by mistake and I apologize for it.

Luc Pattyn19-Jul-10 4:29

19-Jul-10 4:29

Are you kidding? I mentioned two mistakes in his code, he fixed none of them, instead he changed the input data. And my sig (as most always telling people to use PRE tags) got completely ignored too. I wonder why I'm still replying to questions?

PS: I wish the pinning bug got finally fixed, comparing two posts is pretty hard right now.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

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