Re: Using FileStream - C# Discussion Boards

Vasudevan Deepak Kumar22-Aug-07 4:57

Vasudevan Deepak Kumar

22-Aug-07 4:57

Did the Writer object close the Stream and got nulled before the StreamReader attempted to open it?

Vasudevan Deepak Kumar
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gauthee22-Aug-07 5:05

gauthee

22-Aug-07 5:05

There is no writerstream!
On sending the file to the printer driver a pdf file is created and saved in respective folder, after this operation(print operation) then iam trying to open the pdf file using the filestream and at this point it thows error:

file cannot be accessed as it is being used by another process.....

gauthee

Luc Pattyn22-Aug-07 5:29

Luc Pattyn

22-Aug-07 5:29

Hi,
if your producer does not signal it is done producing the file, the only
things you can do are:
- wait a very long time;
- or loop {wait a short time; try; exit on success;}

BTW: if the web service is going to send the PDF back to the client, it will
have to delete the file also; that too can fail because the file is being
read by another process (Antivirus, Google desktop, whatever).
The remedy is: loop {try; exit on success; wait a short time;}

Smile | :)

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Tim Wuytens23-Aug-07 0:23

Tim Wuytens

23-Aug-07 0:23

You can use a FileSystemWatcher for this.

This class is used to monitor a certain folder on the filesystem (disk) where your service runs.
It fires events when something changes to the filesystem (eg. file created, renamed, deleted,...)

Say your PDF printer saves the file as c:\temp\pdf\someName.pdf, then you can monitor the c:\temp\pdf folder with the FileSystemWatcher.
When a file is created in that directory (by your pdf printer) an event is thrown. You can catch this event and
then send the newly generated file.

For more info on this class please visit the MSDN site here[^].

Hope this helps!
Tim Wuytens

gauthee23-Aug-07 2:39

gauthee

23-Aug-07 2:39

Tim,

Thanks for the reply!
It is indeed a valid suggestion, though i have few questions.

When the PDF printer starts printing a file would be at a location so the filewatcher checks that a file is created and the event gets fired thereby.

The filewatcher can identify creation, deletion, modification but i guess my requirement is something like creation complete.
Something should be fired once the file is created and completly loaded!

gauthee

Need fast way to populate treeView

Tim Wuytens23-Aug-07 3:03

Tim Wuytens

23-Aug-07 3:03

I took a quick look at the documentation of Nova PDF and found that you can catch events from the printer driver self.

There is an event NOVAPDF2_ENDDOC which fires when the job is done. Maybe this could be of use for you?

I've used the PDF document found on http://www.novapdf.com/download/pdf/novasdk.pdf[^]

See on page 28 of this document for the events.
See heading 4.5 on page 20 to see how to register to the events.

There's even something about e-mailing the converted documents in this guide.

Hope this helps as well!
Tim Wuytens

ronwynn22-Aug-07 4:42

ronwynn

22-Aug-07 4:42

I have a need to populate a treeview control with a file containing as much as 500,000 lines of data. The data file contains information that could be saved as an Excel .xls file, or a .csv file, or a straight text file. I have a C# project that reads the data from an excel file and populates my treeview control, but it takes FOREVER for just 25,000 lines. And Excel files have the 65K line limit anyway.

Can someone tell me what the fastest methode would be to populate a treeview control with data from a file that could contain as many as a half a million lines or more?

Thanks.

Vasudevan Deepak Kumar22-Aug-07 4:58

Vasudevan Deepak Kumar

22-Aug-07 4:58

That would say would be a horrendifying experience to the user loading from a text file considering the largest wait time unless the system had enough powerful horsepowers to process it as if it possessed a magical wand. Roll eyes | :rolleyes:

Vasudevan Deepak Kumar
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L Henson22-Aug-07 5:13

L Henson

22-Aug-07 5:13

Just a couple of ideas:
1) Call BeginUpdate before you add the nodes and then EndUpdate once you are done.
2) If possible, use the Nodes.AddRange method instead of the Nodes.Add method.

Regardless, half a million lines in a treeview sounds a tad daft...

martin_hughes22-Aug-07 5:46

martin_hughes

22-Aug-07 5:46

I think your approach is wrong here - populating anything user oriented (except my bank account) with 500,000 somethings is pointless. No user would be able to make sense of that much data.

"It was the day before today.... I remember it like it was yesterday."

-Moleman

pbraun22-Aug-07 8:40

pbraun

22-Aug-07 8:40

I agree. The approach is wrong. There are other approaches that work better. I'm betting that someone somewhere has implemented a control that can keep a portion of the file in the visible window while the user scrolls up or down. It may not be the ideal solution, but it definitely is not the worst.

Phil

Re: Saving PageSetupDialog.PageSettings;

Whytespot22-Aug-07 10:44

Whytespot

22-Aug-07 10:44

Load it dynamically. On form load, load the first-level tree nodes, and when the user expands and individual node load it's children.

If they are all first-level nodes you have some serious design issues to deal with.

Luc Pattyn22-Aug-07 4:39

Luc Pattyn

22-Aug-07 4:39

Hi,

within a single run of your app you can get this for free by creating the
dialog only once, and reusing it over and over.

Across app sessions, you obviously would need to store and retrieve the info
somehow.

Smile | :)

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Re: Saving PageSetupDialog.PageSettings;

udikantz22-Aug-07 5:09

udikantz

22-Aug-07 5:09

hey thanks for the reply,
ofcourse my problem is on Across app sessions,
the problem is when i store the PageSettings
and and set the PageSetupDialog.PageSettings
it shows the default values... and not the values that i have saved.
and im sure that the PageSettings that i have saved in the Properties
do not contain the default values...

maybe when you do PageSetupDialog.PageSettings = somePageSettings;
it doesnt effect the PageSetupDialog... i dont know cause evrything
i do results with displaying the default values again...

Net

Write Dataset to SQL

GermanDM22-Aug-07 3:50

GermanDM

22-Aug-07 3:50

Hi,

Can anybody please assist me with the following.I have googled but no luck.

I receive a dataset from a webservice which contains all data i requested. How can I simply insert all the rows which are in the dataset into SQL database?
The dataset contains three tables and the sql database destination has the exact same tables and columns.

any help, suggestions or articles will be greatly appreciated.

Re: Write Dataset to SQL

Vasudevan Deepak Kumar22-Aug-07 5:00

Vasudevan Deepak Kumar

22-Aug-07 5:00

http://www.codeproject.com/useritems/GenerateSQL.asp[^]

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Re: Write Dataset to SQL

costavo22-Aug-07 5:00

costavo

22-Aug-07 5:00

did u try doing a stored procedure and an insert sql command?

Re: Write Dataset to SQL

Giorgi Dalakishvili22-Aug-07 5:01

Giorgi Dalakishvili

22-Aug-07 5:01

Did you search here on codeproject? I'm sure you will find necessary articles.

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string.IndexOf help

solutionsville22-Aug-07 3:28

solutionsville

22-Aug-07 3:28

I want to take the value of textBox1.text, pass it to a find routine and then display the results of all lines that have the given text.

The find portion I have figured out. the IndexOf routine I have not figured out.

Here is my find routine;

private void btnFind_Click(object sender, System.EventArgs e)
{
try
{
int StartPosition;
StringComparison SearchType;
if (chkMatchCase.Checked == true)
{
SearchType = StringComparison.Ordinal;
}
else
{
SearchType = StringComparison.OrdinalIgnoreCase;
}
StartPosition = mMain.rtbDoc.Text.IndexOf(txtSearchTerm.Text, SearchType);
if (StartPosition == 0)
{
MessageBox.Show("String: " + txtSearchTerm.Text.ToString() + " not found", "No Matches", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
return;
}
mMain.rtbDoc.Select(StartPosition, txtSearchTerm.Text.Length);
mMain.rtbDoc.ScrollToCaret();
mMain.Focus();
btnFindNext.Enabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString(), "Error");
}
}

Lets say I want to search for and display every line that has the word "one" in it and then display it in a RichTextBox

one plus four
two plus four
three plus four
one minus four
one divided by four
two minus four
two divided by four
three plus five
three minus five

When the search is done, it show like this in the RTB with nothing else.;

one plus four
one minus four
one divided by four

Thanks in advance!

Brian

Martin#22-Aug-07 3:45

Martin#

22-Aug-07 3:45

Hello,

I'm not sure if I understand you right,
but if you have a multiline TextBox and want to iterate over the lines to find the lines with a search string in it.

Then use a method like this:

using System.Collections.Specialized;
 
public static StringCollection FindLinesOverSearchString(string[] LinesToSearch, string TextToSearch)
{
	StringCollection resultLines = new StringCollection();
	if(LinesToSearch!=null)
	{
		foreach(string actLine in LinesToSearch)
		{
			if(actLine.IndexOf(TextToSearch)!=-1)
			{
				resultLines.Add(actLine);
			}
		}
	}
	return resultLines;
}

And call it like this:

StringCollection textboxresult = FindLinesOverSearchString(yourTextBox.Lines, "searchstring");

All the best,

Martin

solutionsville22-Aug-07 4:06

solutionsville

22-Aug-07 4:06

Martin, if I understand you correctly,

The method will find what I want.

I am not sure I understand how I take the value of the textbox as a string and pass it to the above routine and then get it to the second textbox.

I understand the string collextion piece, as it looks fairly simple in that respect.

Thanks,

Brian

Martin#22-Aug-07 4:30

Martin#

22-Aug-07 4:30

solutionsville wrote:
I am not sure I understand how I take the value of the textbox as a string and pass it to the above routine

You don't need to do that.

The method I posted, takes a string[] as parameter for the lines to search.
The TextBox class has a property called "Lines" which is type of string[], and this will be passed as parameter.

FindLinesOverSearchString(yourTextBox.Lines, "searchstring");

The second parameter is quit simple the string to search.

The result is in my case a dynamic collection of the type: System.Collections.Specialized.StringCollection.
This class has an "Add" method, which will be used to add the matching line to the collection.

If you now have the result and want to show it in a second multiline textbox:

//Again the method call for the search
StringCollection resultLines = FindLinesOverSearchString(yourTextBox.Lines, "searchstring");
 
//create a new instance of string[], with the needed lenght
string[] resultAsStringArray = new string[resultLines.Count];
//copy data of StringCollection to the new string[]
resultLines.CopyTo(resultAsStringArray,0);
//path it to the result TextBox "Lines" property
yourTextBoxResult.Lines = resultAsStringArray;

Hope it helps!

All the best,

Martin