Re: Modifying inbound HTML - C# Discussion Boards

Drew McGhie12-Dec-05 4:46

12-Dec-05 4:46

You're really unspecific as to what you want. Is there any way you could present us with a sample returned dataset, and how you would like it displayed(even if its just typed and spaced accordingly). This would give me more information so I could point you in the direction of resources where you could get the most help.

Modifying inbound HTML

Sunil Shindekar12-Dec-05 2:55

Sunil Shindekar

12-Dec-05 2:55

Hi,

I want to write a program which will modify the inbound HTML in the IE 6.0. It will capture the inbound HTML before it gets displayed, make some modifications in it and display it in the IE. Can anybody tell me how to achieve this?

The typical flow will be - User will enter the URL in the Internet explorer
Address Bar. The incoming HTML will be read by my program before it gets
displayed. My program will modify some strings - say phone numbers in it and
display the modified HTML.

Technology is not a restriction. I am ready to use VC++ or .NET. Do I have
to use shell Extension? If yes, which interface/event will be helpful?

Thanks in advance.

Regards,
Sunil

Re: Modifying inbound HTML

MarcelErz12-Dec-05 3:09

MarcelErz

12-Dec-05 3:09

Hello!

That's kinda easy to implement:

Just capture the "DownloadComplete"-event, get the Document-property and then the outertext-property of the body... Change the values and write it back to the outertext-property:

private void m_Browser_DownloadComplete(object sender, System.EventArgs e)
{
IHTMLDocument2 loDocument = (IHTMLDocument2)this.m_Browser.Document;

string lsHtml = Document.body.outerHTML;

// make changes

Document.body.outerHTML = lsHtml;
}

In the above shown example, you can see that it just change the body. Another thing is, that you won't see it in the source-code when you open the source-file with the IE context menue. To change the whole file (and document)... you can write an HTML-file back with the write-methode of the browser component. Don't forget to clear the document object with the clear-methode, b4 you load a new one!

I hope I could help you!

Marcel Erz

-- modified at 9:10 Monday 12th December, 2005

Re: Modifying inbound HTML

Sunil Shindekar13-Dec-05 3:35

Sunil Shindekar

13-Dec-05 3:35

Hi,

I have some more doubts. As I am novice to all these things, please excuse me if I am talking some non sense.

As per my understanding, above solution assumes that the IE control is embedded in the application. In my case, IE will be invoked from Desktop and I want to capture any HTML which is loaded in that the browser loaded from Desktop. The HTML also might not be mine. It can be loaded by giving any URL like www.google.com or www.msn.com etc. So do I have to get the instance of the Internet Explorer which is invoked from Desktop? If yes, how to get the instance of it?

Thanks,
Sunil

Re: Modifying inbound HTML

MarcelErz13-Dec-05 12:55

MarcelErz

13-Dec-05 12:55

Hi!

Here is an example to catch all running instances:

public void FindIE() {
// Retrieve list of all IE instances
SHDocVw.ShellWindows loIEs = New SHDocVw.ShellWindows();
SHDocVw.InternetExplorer loIE = null;

int llCount = 0;
mshtml.IHTMLDocument2 loDocument = null;

URLList.Items.Clear();
TitleList.Items.Clear();

IECountText.Text = loIEs.Count;

while(llCount <= loIEs.Count) {
loIE = loIEs.Item(llCount);
llCount++;

if (loIE != null) {
URLList.Items.Add(loIE.LocationURL);

loDocument = (mshtml.IHTMLDocument2)loIE.Document;
if (loDocument != null) {
TitleList.Items.Add(loDocument.title);
}
}
}
}

URLList -> List of all URLs open from instaces
TitleList -> List of all title tag data of all opened documents in the instances
IECountText -> Amount of Instances found

The "SHDocVw.ShellWindows" retrieve all instances of the IE. When every instance get created, it sign in to this list automatically, thats why you have an overview of all IE instances.
"SHDocVw.InternetExplorer" is one instance of an IE. With this, you can kinda do everything what you can do with the browser inside your application. Here an example of changing html of all instances:

public void ChangeAllIE() {
// Retrieve list of all IE instances
SHDocVw.ShellWindows loIEs = New SHDocVw.ShellWindows();
SHDocVw.InternetExplorer loIE = null;

int llCount = 0;
mshtml.IHTMLDocument2 loDocument = null;

URLList.Items.Clear();
TitleList.Items.Clear();

IECountText.Text = loIEs.Count;

while(llCount <= loIEs.Count) {
loIE = loIEs.Item(llCount);
llCount++;

if (loIE != null) {
URLList.Items.Add(loIE.LocationURL);

loDocument = (mshtml.IHTMLDocument2)loIE.Document;
if (loDocument != null) {
loDocument.clear();
loDocument.writeln((object)"Changed html!");
loDocument.close();
}
}
}
}

I hope it is clear so far and it works like I said, coz cannot check it at the moment! I will try it tomorrow morning, but I think it will work! If you need more help, just post it here!

Marcel Erz

P.S.: Plz try to understand the code, and not just copy it. The best way to learn is, to read and understand code!

Re: Modifying inbound HTML

Sunil Shindekar19-Dec-05 2:30

Sunil Shindekar

19-Dec-05 2:30

Hi Marcel,

Thank you for your reply and sample code. I have one more query. I want to create a toolbar for the Internet Explorer which will have controls like drop down and push buttons. I need to write the program in C#. Can you give me some direction in this regard?

Thanks in advance.

Sunil

Re: Modifying inbound HTML

MarcelErz19-Dec-05 10:24

MarcelErz

19-Dec-05 10:24

Hi!

At the moment I don't really have a lot of time, but take a look at this:
http://www.codeproject.com/csharp/dotnetbandobjects.asp[^]
I think is that what you are looking for! Tell me if you have problems with it. May be I can help!

Marcel Erz

Re: Modifying inbound HTML

Sunil Shindekar2-Jan-06 0:55

Sunil Shindekar

2-Jan-06 0:55

Hi,

I wrote the program as mentioned above. However I used the event DocumentComplete instead of DownloadComplete. It is working fine if new URL is given in the browser window. But if Refresh button of browser is clicked, then DocumentComplete event is not getting fired. However DownloadComplete event is getting fired. But DownloadComplete event does not give me the WebBrowser object for which the event is fired as it is available in the DocumentComplete event. Is there any way in this function to get the instance of WebBrowser from which this event is fired?

Thanks in advance.

Regards,
Sunil

Control does not redraw after loosing and regaining focus

uGue12-Dec-05 2:35

uGue

12-Dec-05 2:35

Hi there, C# experts!

I have a (in my view actually simple) problem:

In my application I want to wait for a predefined timespan and show this to the user via a progress bar. However, I want to call the waiting method from my business logic class rather than from my GUI class. Therefor I use following simple code:

public void Wait4Something()
{
// Timespan we want to wait...
int Wtime = 60;

// myBar is the progress bar owned by the form.
// "this" is NOT the form but a motor class
// driving the form and driven by form events.
if( this.myBar != null )
{
this.myBar.Value = 0;
this.myBar.Maximum = Wtime;
this.myBar.Step = 1;
}

this.myGUI.Refresh();

for ( int i = 0; i < Wtime; i += 1 )
{
this.SomeOtherObject.Wait4BroadcastReply( (uint) 1000 );
this.myBar.PerformStep(); // Proceed with the progress bar
this.myGUI.Refresh(); // <- this does not do apparently
}

if( this.myBar != null ) this.myBar.Value = 0;
}

However, if I let the code run, everything is fine until I hit [ALT]-[TAB] to swap windows and then hit it again to swap back to my app.

By then, the GUI freezes, shows the hourglass and does not redraw or revalidate and the progress bar does not do steps either. After the specified waiting time, the control returns to normal and reacts to every event as expected.

I could probably dissolve the whole thing by starting a new thread, but i hoped not to get forced to do this for a simple visualization of waiting :/

Does anyone know of a feasible solution??

Thanks in advance for your regard,

Udo

"You can do it that way or that way. I like it that way."

Re: Control does not redraw after loosing and regaining focus

Robert Rohde12-Dec-05 3:54

Robert Rohde

12-Dec-05 3:54

An Application.DoEvents() call instead (or additional) to the Refresh could do the job. But note that you then probably have to disable the form because it will react to user input.
A seperate thread would be better...

Re: Control does not redraw after loosing and regaining focus

uGue12-Dec-05 5:34

uGue

12-Dec-05 5:34

Hi Robert,

thanks for your instant help, I was afraid of it but in the end it's probably best to do it right in the first place. So I'll be weaving some threads...

Thanks,

Udo

----

Anyway, Application.DoEvents() did help as a hotfix, and as I'm not doing anything mutual it's probably harmless to let the GUI react to user input, if not wanted. So thanks again for your very helpful advice!

Windows Form

faisal khanani12-Dec-05 2:29

faisal khanani

12-Dec-05 2:29

I have come across with a little problem that must be simpler for you guys;
As a matter of fact, i m new in .Net/C# environment, hence i m facing a little bit difficulty in writing code.

I have a form (Non-MDI); on its next button after successfull execution of a method i have to open a new form and for doing this i have written the following code:

DBSecurity.DBSecurity msecure=new DBSecurity.DBSecurity(strServer,strUser,strPwd,strDatabase);

if (msecure.Generate(txtCompany.text,txtLocation.Text)==true)
{
SecurityGUI.frmGUI frm=new frmGUI();
frm.ShowDialog();
this.Close();
}

this code works fine as far as frmGUI form opening is concerned but it do not close the existing form and it still open on back.

Am i writing wrong code? or do you have another solution?

Re: Windows Form

uGue12-Dec-05 3:02

uGue

12-Dec-05 3:02

Hi,

in the .NET documentation about the Form class ShowDialog() method it says this:

"You can use this method to display a modal dialog box in your application. When this method is called, the code following it is not executed until after the dialog box is closed."

That means that the behaviour you describe is wanted. It's not a bug, it's a feature Wink | ;)

Try the Show() method. That could be your solution.

Regards,

Udo

Re: Windows Form

Polis Pilavas12-Dec-05 4:47

Polis Pilavas

12-Dec-05 4:47

Try hiding your "parent" form instead and re-show it when you're done with the "child" (frmGUI) one:

SecurityGUI.frmGUI frm = new frmGUI();
this.Hide();
frm.ShowDialog();
this.Show();

This will work fine since after closing the child form, the applications' control will return to the line that immediately follows the ShowDialog() method.

Regards,
Polis

Can you practice what you teach?

Re: Windows Form

faisal khanani12-Dec-05 18:14

faisal khanani

12-Dec-05 18:14

thanks Poils,

It works fine.

load a .gif image at runtime in crystal report

dhol12-Dec-05 2:01

dhol

12-Dec-05 2:01

Hi

I have done a program in C# such that , added a crystal report viewer, then added a button named as browse… and designed a report by getting source from the xml schema file(.xsd file) with two fields namely name,image..... name is of string datatype and image is of
datatype base64Binary.. so now when I run the program.. using browse button I can be able to load a .jpg image at runtime.. so that image will be displayed in the report…. This is wht my program does…

Now what I have to do is that ,I should be able to load a .gif image at runtime and display in crystal report.At present when I select a .gif image..its not shown in crystal report…so please help me to do this.. I will enclose my coding part along with this..please have a look at it and help me to do this program….

and the coding is as follows:

// Prcocedure: AddImageRow
// reads an image file and adds this image to a dataset table
//
void AddImageRow(DataTable tbl, string name, string filename)
{
FileStream fs = new FileStream(filename, FileMode.Open); // create a file stream
BinaryReader br = new BinaryReader(fs); // create binary reader
DataRow row;

// create a new datarow
row = tbl.NewRow();

// set country field and image field
row[0] = name;
row[1] = br.ReadBytes((int)br.BaseStream.Length);

// add this row to the table
tbl.Rows.Add(row);

// clean up
br = null;
fs = null;
}

//Browse button
private void button1_Click(object sender, System.EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
// openFileDialog1.Filter = "Image Files(*.jpg) | *.jpg ";
openFileDialog1.Filter = "Image Files(*.jpg) |*.jpg | All Files(*.*) | *.*";
openFileDialog1.ShowDialog(this);
//the variable myPic contains the string of the full File Name,it includes the full path.
string mypic = openFileDialog1.FileName;

DataSet data = new DataSet();

// add a table 'Images' to the dataset
data.Tables.Add("Images");

// add two fields
data.Tables[0].Columns.Add("Country", System.Type.GetType("System.String"));
data.Tables[0].Columns.Add("img", System.Type.GetType("System.Byte[]"));

AddImageRow(data.Tables[0],mypic,mypic);

// create a report
showimage cr = new showimage();
cr.SetDataSource(data);
// pass a reportdocument to the viewer
crystalReportViewer1.ReportSource = cr;

}

Read .dif file format + store in dataser

Darshan Gandhi12-Dec-05 1:36

Darshan Gandhi

12-Dec-05 1:36

how can i read .dif file in asp.net using c#

darshan gandhi

Re: Read .dif file format + store in dataser

Dave Kreskowiak12-Dec-05 6:21

Dave Kreskowiak

12-Dec-05 6:21

Not enough information. There are currently 9 known uses for ".DIF" files in the FileExt database, here[^].

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Implement CheckBoxes in Listbox?

MudkiSekhon12-Dec-05 1:27

MudkiSekhon

12-Dec-05 1:27

Hi friends,
Plz suggest me how can i implement checkboxes in listbox in Windows forms application. I want to use checkboxes to select items from the listbox. If possible, plz send me the code.....

Thanks,
Sandeep
+919891027854

Re: Implement CheckBoxes in Listbox?

Polis Pilavas12-Dec-05 2:29

Polis Pilavas

12-Dec-05 2:29

Look for a Windows forms' control called CheckedListBox in your toolbox instead

Regards,
Polis

Can you practice what you teach?

Re: Implement CheckBoxes in Listbox?

MudkiSekhon12-Dec-05 2:40

MudkiSekhon

12-Dec-05 2:40

Thanks for ur reply. Have u any sample code in which u catch the checkboxes that are selected from the CheckedListBox?
I want to select multiple values from tha CheckedListBox....

Regards,
Sandeep
+919891027854

Re: Implement CheckBoxes in Listbox?

Polis Pilavas12-Dec-05 4:41

Polis Pilavas

12-Dec-05 4:41

Yes, take a look below at the following self-explanatory code chunk. First I add three items into the checkedListBox, and then I get the text of the selected ones by looping through each one of them:

string <code>checkedItems </code>= "";

// Add a few items into the checkedListBox control
this.checkedListBox1.Items.Add("Item 1", CheckState.Checked);
this.checkedListBox1.Items.Add("Item 2", CheckState.Indeterminate);
this.checkedListBox1.Items.Add("Item 3", CheckState.Unchecked);

// Retrieve the selected items in a string
for (int i = 0; i < this.checkedListBox1.Items.Count; i++)
{
	if (this.checkedListBox1.GetItemChecked(i))
		<code>checkedItems </code>+= this.checkedListBox1.Items[i].ToString() + "\n";
}

MessageBox.Show(<code>checkedItems</code>);

Regards,
Polis

Can you practice what you teach?

Retreiving and displaying strings...in Treeview

Mahi.Ragava11-Dec-05 23:17

Mahi.Ragava

11-Dec-05 23:17

Thanx senthil...It works...

If the same have to be done in treeview,i can add the firstline strings of the file as Nodes,
From the Nextline ,each element belongs a column..
That is...
"Tic","Tac","Toe"
"1","2","3"
"4","5","6"

Here...Tic ,Tac,and Toe are 3 sep columns and "1","4" belongs to Tic.."2","5" belongs to Tac and "3","6" belongs to Toe...
How to add those as "1","4"etc...as childnodes of "Tic"....

Am in urgent search for this kind of display...Kindly help me...

Logout code..

momoo11-Dec-05 22:30

momoo

11-Dec-05 22:30

Hi, everyone.. I just started learning C# web application not long ago.. I like to enquire that if the user wants to logout of the web page/site, what is the code for the logout command when i click on the logout button?? Sorry as my question is too simple for you guys.. But thanks for the help.. Wink | ;)

Thanks

Re: Logout code..

Dave Kreskowiak12-Dec-05 6:18

Dave Kreskowiak

12-Dec-05 6:18

That all depends on what your using to handle logins. There is no one way of authenticating, tracking, and giving roles to users of your site. How you do the logout depends ENTIRELY on how you designed your authentication package, how your tracking your user sessions, what you need to do when the user logs out, or the session times out.

Without a LOT more detail about your security system, it's impossible for anyone to tell you how to code your logout. That is, other than dropping a button on a form and handling it's click event.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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