Some advice for web crawling - html parsing. - C# Discussion Boards

Re: interlock exchange issue

15-May-08 0:58

OK - so how do the ranges get selected, by selecting a group from both drop downs ? I guess you can just check when the second range is selected, if it intersects. This seems trivial to me. Where is the issue ?

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

interlock exchange issue

George_George14-May-08 23:23

George_George

14-May-08 23:23

Hello everyone,

How to fix the compile error when interlock exchange a bool type variable?

public static void Main()
{
    bool b = false;

    // error CS0452: The type 'bool' must be a reference type in order to use it as parameter
    // 'T' in the generic type or method 'System.Threading.Interlocked.Exchange<T>(ref T, T)'
    bool a = Interlocked.Exchange(ref b, true);

    return;
}

thanks in advance,
George

S. Senthil Kumar15-May-08 1:22

S. Senthil Kumar

15-May-08 1:22

You're out of luck, MSDN[^] clearly says

"This method only supports reference types. There are overloads of the Exchange method for the value types Int32, Int64, IntPtr, Single, and Double, but there is no support for other value types."

Regards
Senthil [MVP - Visual C#]
_____________________________
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Re: interlock exchange issue

George_George15-May-08 1:31

George_George

15-May-08 1:31

Thanks Senthil,

Question answered.

regards,
George

Some advice for web crawling - html parsing.

George Sp.14-May-08 23:17

George Sp.

14-May-08 23:17

Hey guys I'm new here! So here's my problem: I have to do a project for the university. I have to use a crawler, download some pages to my hard drive (number doesn't matter atm) and then for each page of these (for each URL to be exact) I need to populate a database with each page's URL and all the links that this page contains.

I found this crawler on the site http://www.codeproject.com/KB/IP/Crawler.aspx[^].

But since I'm a newbie I can't seem to find a way to do what I need. Do I need to html-parse each page after it is downloaded? Or can I simply tweak the crawler's code and do what I need?

Thanks in advance
George

All you have to decide is what to do with the time that is given to you.-

Globalization

Member 475670914-May-08 23:16

Member 4756709

14-May-08 23:16

Hi i have to develop an application which supports globalization feature. I am storing the data into a ms access database, so i want to know whether ms access do provide any features for globalization or not..

Re: Globalization

Christian Graus14-May-08 23:54

Re: free SMS xml web service

14-May-08 23:54

No, it's a database. You need to design tables that contain your globalised strings.

free SMS xml web service

Amr M. K.14-May-08 23:04

Amr M. K.

14-May-08 23:04

Dear All,
Any one know free xml web service,to send sms messages(include amlost all countires) using C#,

Yes. CreatiVity withOuT limiTs

Christian Graus14-May-08 23:54

Compress an Image to a small JPEG

14-May-08 23:54

If it exists, google knows. There are also articles here on CP, but all the gateways I know of, in articles or otherwise, are not international.

anderslundsgard14-May-08 22:14

anderslundsgard

14-May-08 22:14

My program uses a lot of pictures (from screendumps) and I need to compress those so that my program uses less memory. Any idea how to do that in C#?

_____________________________

...and justice for all

APe

Re: Compress an Image to a small JPEG

Christian Graus14-May-08 23:55

14-May-08 23:55

If you have an image as something other than a JPEG, load it into a Bitmap and save it as a JPEG.

auto position

benjamin yap14-May-08 21:16

benjamin yap

14-May-08 21:16

Hi, i have a form which is size 500 * 300

I have groupbox, textboxes, and buttons inside that form. When the form is loading into my main mdi parent form, its size is 500*300, when i maximize the childform, my controls all are at the position top left. How do i make it center( when the window is maximize) depending on the screen size?

sunspeed14-May-08 21:39

14-May-08 21:39

If you want to center the groupbox, not the controls in it,
personally I would recalc the Location from the groupbox on the maximize event.
The controls in the groupbox will change their location automatically.

For the other controls outside the groupbox, use a panel and calc its location as you do for the groupbox.

Hope this helps

Tiefe Brunnen muss man graben wenn man klares Wasser will,
tiefe Wasser sind nicht still.

benjamin yap14-May-08 21:53

benjamin yap

14-May-08 21:53

how to i recalculate the location? do i have to so some division or multiplication or somthing./

dan!sh 14-May-08 22:07

dan!sh

14-May-08 22:07

You do not need to any calculations if you do proper anchoring. It will solve the purpose. Use TableLayoutPanel in case you find it difficult to anchor controls as such.

Avoid Google. Use Blackle[^]

sunspeed14-May-08 22:11

14-May-08 22:11

anchoring changes the size of the control to center i thought? imho if you want to center the control without changing its size, you have to recalc.

Tiefe Brunnen muss man graben wenn man klares Wasser will,
tiefe Wasser sind nicht still.

dan!sh 14-May-08 22:40

dan!sh

14-May-08 22:40

<blockquote class="FQ"><div class="FQA">sunspeed wrote:</div>imho</blockquote>

What does this mean?

If used smartly, anchoring can help you postion the control to centre the control with or without resizing.
I have created a sample form in which control will be at centre(and of same size) regardless of how you resize the form.

Avoid Google. Use Blackle[^]

sunspeed14-May-08 22:43

14-May-08 22:43

Could you send me the code? Thats interesting.
I have not found this possibility.

imho means "in my humble opinion"

Tiefe Brunnen muss man graben wenn man klares Wasser will,
tiefe Wasser sind nicht still.

dan!sh 14-May-08 22:53

dan!sh

14-May-08 22:53

Here it is:

using System;<br />
using System.Collections.Generic;<br />
using System.ComponentModel;<br />
using System.Data;<br />
using System.Drawing;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
<br />
namespace CPProj {<br />
  public partial class Anchoring : Form {<br />
<br />
    #region Constructors<br />
    public Anchoring() {<br />
      // Default constructor<br />
      InitializeComponent();<br />
      }                                                                                 // Anchoring<br />
    #endregion<br />
<br />
    #region Code from Designer File<br />
<br />
    /// <summary><br />
    /// Required designer variable.<br />
    /// </summary><br />
    private System.ComponentModel.IContainer components = null;<br />
<br />
    /// <summary><br />
    /// Clean up any resources being used.<br />
    /// </summary><br />
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param><br />
    protected override void Dispose(bool disposing) {<br />
      if(disposing && (components != null)) {<br />
        components.Dispose();<br />
        }<br />
      base.Dispose(disposing);<br />
      }<br />
<br />
    /// <summary><br />
    /// Required method for Designer support - do not modify<br />
    /// the contents of this method with the code editor.<br />
    /// </summary><br />
    private void InitializeComponent() {<br />
      this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();<br />
      this.grpSample = new System.Windows.Forms.GroupBox();<br />
      this.btnSample = new System.Windows.Forms.Button();<br />
      this.tableLayoutPanel1.SuspendLayout();<br />
      this.grpSample.SuspendLayout();<br />
      this.SuspendLayout();<br />
      // <br />
      // tableLayoutPanel1<br />
      // <br />
      this.tableLayoutPanel1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)<br />
                  | System.Windows.Forms.AnchorStyles.Left)<br />
                  | System.Windows.Forms.AnchorStyles.Right)));<br />
      this.tableLayoutPanel1.ColumnCount = 3;<br />
      this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));<br />
      this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Absolute, 110F));<br />
      this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 50F));<br />
      this.tableLayoutPanel1.Controls.Add(this.grpSample, 1, 1);<br />
      this.tableLayoutPanel1.Location = new System.Drawing.Point(3, 12);<br />
      this.tableLayoutPanel1.Name = "tableLayoutPanel1";<br />
      this.tableLayoutPanel1.RowCount = 3;<br />
      this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));<br />
      this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Absolute, 110F));<br />
      this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 50F));<br />
      this.tableLayoutPanel1.Size = new System.Drawing.Size(277, 242);<br />
      this.tableLayoutPanel1.TabIndex = 0;<br />
      // <br />
      // groupBox1<br />
      // <br />
      this.grpSample.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)<br />
                  | System.Windows.Forms.AnchorStyles.Left)<br />
                  | System.Windows.Forms.AnchorStyles.Right)));<br />
      this.grpSample.BackColor = System.Drawing.SystemColors.ControlText;<br />
      this.grpSample.Controls.Add(this.btnSample);<br />
      this.grpSample.Location = new System.Drawing.Point(86, 69);<br />
      this.grpSample.Name = "groupBox1";<br />
      this.grpSample.Size = new System.Drawing.Size(104, 104);<br />
      this.grpSample.TabIndex = 0;<br />
      this.grpSample.TabStop = false;<br />
      this.grpSample.Text = "groupBox1";<br />
      // <br />
      // button1<br />
      // <br />
      this.btnSample.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)<br />
                  | System.Windows.Forms.AnchorStyles.Left)<br />
                  | System.Windows.Forms.AnchorStyles.Right)));<br />
      this.btnSample.Location = new System.Drawing.Point(6, 31);<br />
      this.btnSample.Name = "button1";<br />
      this.btnSample.Size = new System.Drawing.Size(75, 23);<br />
      this.btnSample.TabIndex = 0;<br />
      this.btnSample.Text = "button1";<br />
      this.btnSample.UseVisualStyleBackColor = true;<br />
      // <br />
      // Anchoring<br />
      // <br />
      this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);<br />
      this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;<br />
      this.ClientSize = new System.Drawing.Size(292, 266);<br />
      this.Controls.Add(this.tableLayoutPanel1);<br />
      this.MinimumSize = new System.Drawing.Size(200, 200);<br />
      this.Name = "Anchoring";<br />
      this.Text = "Anchoring";<br />
      this.tableLayoutPanel1.ResumeLayout(false);<br />
      this.grpSample.ResumeLayout(false);<br />
      this.ResumeLayout(false);<br />
<br />
      }<br />
   <br />
<br />
    private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;<br />
    private System.Windows.Forms.GroupBox grpSample;<br />
    private System.Windows.Forms.Button btnSample;<br />
    #endregion<br />
    }                                                                                   // Class<br />
  }                                                                                     // Namespace

Avoid Google. Use Blackle[^]

sunspeed14-May-08 23:08

14-May-08 23:08

ah, ok you use the TableLayoutPanel thats one possiblity.
Thanks for that example!

cheers

Tiefe Brunnen muss man graben wenn man klares Wasser will,
tiefe Wasser sind nicht still.

sunspeed14-May-08 22:08