Strting parsing - C# Discussion Boards

Re: Working with 1GB XML file

19-Dec-06 4:25

I have a client server application and i am writing messages from the client to the XML file. sometimes the files reaches 1GB. Operating such a large XML file creates lot of problems such as memory, time. there may be loss of data too.

please suggest me a method to operate my file with less memory?????

Thanks in advance...

Praveen Raghuvanshi
Software Engineer

Daniel Grunwald19-Dec-06 5:04

Daniel Grunwald

19-Dec-06 5:04

XML is a bad choice handling large amounts of data.

Use XmlTextReader and XmlTextWriter for reading/writing XML files. Do not use XmlDocument (it stores the whole document in RAM). Use XML only for import/export of data, store it inside a normal binary database for normal usage.

Re: Working with 1GB XML file

Pete O'Hanlon19-Dec-06 5:07

Pete O'Hanlon

19-Dec-06 5:07

If your XML file is getting that big, then there seems to be an architectural problem here. Have you considered using a database instead (much better suited to things like this).

Alternatively, you may want to consider SAX (Simple API for XML) which is an event based rather than tree based API. See http://saxdotnet.sourceforge.net/index.html[^]

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Re: Working with 1GB XML file

donchev_p19-Dec-06 8:42

donchev_p

19-Dec-06 8:42

I think you should consider to use the SAX approach. XmlDocument uses DOM and the whole document is loaded into the memory (as mentioned above).

The SAX approach takes parts of the document only, which may be your solution...

SAX is stream based and the stream is bi-directional. Which means you can write and read. It uses events. Unfortunately I can't help you about the .NET implementation of SAX. I don't know if there is any ...

You may search for the MSXML (Microsoft XML Core Services). I think this is available as COM object.

You also may want to see the following page : http://sourceforge.net/projects/saxdotnet[^]

Hope it helps.

P.S. if you find a solution to this problem - please drop us a line ...

Strting parsing

zaboboa19-Dec-06 4:20

zaboboa

19-Dec-06 4:20

I get a string in the following format from an Html file after calling a GetAttribute method:

file:///C:/Documents%20and%20Settings/azabobonin/My%20Documents/My%20Pictures/Einstein.jpg

How can I format that string to look normally:

C:\Documents and Settings\azabobonin\My Documents\My Pictures\Einstein.jpg

Is there a way of getting the string the way it is writen in the Html file, and not the way it returns from GetAttribute method?

Thank you

Re: Strting parsing

V.19-Dec-06 4:24

19-Dec-06 4:24

try the Replace function.

string test = "file:///C:/Documents%20and%20Settings/azabobonin/My%20Documents/My%20Pictures/Einstein.jpg";<br />
test = test.Replace("%20", " ");

hope this helps.

V.
If I don't see you in this world, I'll see you in the next one... And don't be late. (Jimi Hendrix)

Re: Strting parsing

Pete O'Hanlon19-Dec-06 5:10

Pete O'Hanlon

19-Dec-06 5:10

Use HttpUtility.UrlDecode and then replace the / with \.

Re: Strting parsing

zaboboa19-Dec-06 5:31

zaboboa

19-Dec-06 5:31

I found the solution.

<br />
Uri uri = new Uri(element.GetAttribute("src"));<br />
string filePath = HttpUtility.UrlDecode(uri.AbsolutePath);<br />

Thank you.

Millisecods in C# DateTime format

Praveen Raghuvanshi19-Dec-06 4:20

19-Dec-06 4:20

I wanted to have milliseconds component being added to my DateTime object. It only returns dateTime till seconds. How can i get milliseconds.
DateTime currentDate = DateTime.Now // this statement returns time upto seconds
How can i get milliseconds?????

Thanks in advance

Praveen Raghuvanshi
Software Engineer,

V.19-Dec-06 4:22

19-Dec-06 4:22

Try:

DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss:ff");

hope this helps

V.
If I don't see you in this world, I'll see you in the next one... And don't be late. (Jimi Hendrix)

Colin Angus Mackay19-Dec-06 4:26

Colin Angus Mackay

19-Dec-06 4:26

V. wrote:
DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss:ff");

That only goes to centiseconds.

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V.19-Dec-06 4:36

19-Dec-06 4:36

you can go up until fraction 7 ( so "fffffff")

V.

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Praveen Raghuvanshi19-Dec-06 4:27

19-Dec-06 4:27

Thanks a lot.....

Praveen Raghuvanshi
Software Engineer

Colin Angus Mackay19-Dec-06 4:26

Colin Angus Mackay

19-Dec-06 4:26

praveen raghuvanshi wrote:
I wanted to have milliseconds component being added to my DateTime object. It only returns dateTime till seconds. How can i get milliseconds.
DateTime currentDate = DateTime.Now // this statement returns time upto seconds
How can i get milliseconds?????

The milliseconds component is in there. Is your question about storing to millisecond accuracy, or getting the current time to millisecond accuracy?

A DateTime object can store to milliseconds. e.g.

Console.WriteLine("Now: {0}", DateTime.Now.ToString("HH:mm:ss.fff");

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Praveen Raghuvanshi19-Dec-06 4:29

Validating a User in local computer using DirectoryEntry

19-Dec-06 4:29

Thanks for ur effort, i got my answer

Praveen Raghuvanshi
Software Engineer,
Wins Infotek Pvt. LTd.
Technopark, Trivandrum
India.

martin_codeproject19-Dec-06 4:18

martin_codeproject

19-Dec-06 4:18

Hi,

Iam trying to verify a user account present in the local computer using DirectoryEntry.
The code is as given below:

public bool TestUserLoginInComputer(string userNamePath, string userPassword)
{
try
{
DirectoryEntry myUser = new DirectoryEntry(string.Format("WinNT://" + _machineName + "/" + userNamePath + ", user"),userNamePath, userPassword);

if (myUser != null)
{
mname = admin.Name;
mypath = admin.Path;
return true;
}
else
{ return false; }
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}

Iam getting an exception saying "Logon failure: unknown user name or bad password.". Even though I hav given correct username and password. I hav checked with several accounts, but same problem.
Please sumone cud help me out .

Thanks in advance.
Martin

ArgumentOutOfRangeException delegate

Yustme19-Dec-06 4:03

Yustme

19-Dec-06 4:03

Hi,

I get this error: ArgumentOutOfRangeException

In this line:

this.Invoke(new DelA(delegateA), new object[] { s });

This is the environment of this code:

void delegateA(string s)
{
if (this.InvokeRequired)
{
this.Invoke(new DelA(delegateA), new object[] { response });
}
}

I've tried a few things to fix this, but im running out of suggestions.

Any suggestions anyone?

Thanks in advance!

Martin#19-Dec-06 4:21

Martin#

19-Dec-06 4:21

Hello,

Is "response" a string?
Does youre DelA have an string parameter too?

Martin

Yustme19-Dec-06 4:24

Yustme

19-Dec-06 4:24

Hi,

Yes on both questions.

Martin#19-Dec-06 4:37

Martin#

19-Dec-06 4:37

Hello,

Could you post the full code of youre method and the delegate?

Martin

Yustme19-Dec-06 20:46

Yustme

19-Dec-06 20:46

Hi,

I get this error in run time, by the way.

Here is the code:

void delegateA(string s)
{
if (this.InvokeRequired)
{
this.Invoke(new DelA(delegateA), new object[] { s });
}

else
{
if (this.itemscounter < this.totalitems)
{
this.itemscounter++;
}
}
}

This is the code where the the delegate listens to:

if (this.DelA != null)
{
this.DelA(this.bufferofserialport);
}

When i change the "< this.totalitems" to "< this.totalitems - 1", its not showing up the error.

But than its not completing till the end of the items in my listbox.

Thanks in advance!