Reading from text file and spliting information into array - C# Discussion Boards

ASGill7-Mar-04 16:42

7-Mar-04 16:42

Hi.

<br />
bool FrmIsOpen = false; <br />
<br />
			for (int i=0; i < this.MdiParent.MdiChildren.Length; i++) <br />
			{ <br />
				if (this.MdiParent.MdiChildren[i].GetType() == typeof(FrmPassword)) <br />
				{ <br />
					FrmIsOpen = true; <br />
					break; <br />
				} <br />
			}<br />
 <br />
			if (!FrmIsOpen) <br />
			{ <br />
				FrmPassword r = new FrmPassword(); <br />
				r.MdiParent = this;<br />
				r.Show(); <br />
			} <br />

An unhandled exception of type 'System.NullReferenceException' occurred in CLINICINFORMATIONSYSTEM.exe

Additional information: Object reference not set to an instance of an object.

the error's pointing to the line that has been bold...i dont understand what is it trying to say?....

CODER

Re: loop error

Judah Gabriel Himango7-Mar-04 16:51

Judah Gabriel Himango

7-Mar-04 16:51

It's trying to tell you that something is null; this.MdiParent or MdiParent.MdiChildren is null. Check for that condition before entering the loop.

---------------------------
He who knows that enough is enough will always
have enough.

-Lao Tsu

Re: loop error

ASGill7-Mar-04 18:06

ASGill

7-Mar-04 18:06

Hi,

Im sorry Judah, im a beginner...i would appreciate it if you could show me how i can do that.

thx in advance

CODER

Re: loop error

Judah Gabriel Himango7-Mar-04 18:51

Judah Gabriel Himango

7-Mar-04 18:51

bool FrmIsOpen = false; 

if(this.MdiParent != null && this.MdiParent.MdiChildren != null)
{
   for (int i=0; i < this.MdiParent.MdiChildren.Length; i++) 
   { 
      if (this.MdiParent.MdiChildren[i].GetType() == typeof(FrmPassword)) 
      { 
         FrmIsOpen = true; 
         break; 
      } 
   }
}

if (!FrmIsOpen) 
{ 
   FrmPassword r = new FrmPassword(); 
   r.MdiParent = this;
   r.Show(); 
}

---------------------------
He who knows that enough is enough will always
have enough.

-Lao Tsu

Re: loop error

Dave Kreskowiak8-Mar-04 3:01

Dave Kreskowiak

8-Mar-04 3:01

My first question would be where is this code sitting?

Is it in a child form or an MDIParent? It looks like a parent form has this code, in which case the parent form has no MDIParent. This reference would be null, and therefor, your reference to 'this.MdiParent.MdiChildren.Length' would return null. If this code is in a parent form, then your reference should be this.MdiChildren.Length.

RageInTheMachine9532

Re: loop error

ASGill8-Mar-04 3:15

ASGill

8-Mar-04 3:15

its in a parent form. i tried editing the code your way..but it is still able to open up two same forms...

<br />
bool FrmIsOpen = false; <br />
<br />
			if(this.MdiParent != null && this.MdiChildren != null)<br />
			{<br />
				for (int i=0; i < this.MdiChildren.Length; i++) <br />
				{ <br />
					if (this.MdiParent.MdiChildren[i].GetType() == typeof(FrmPassword)) <br />
					{ <br />
						FrmIsOpen = true; <br />
						break; <br />
					} <br />
				}<br />
			}<br />
 			if (!FrmIsOpen) <br />
			{ <br />
				FrmPassword r = new FrmPassword(); <br />
				r.MdiParent = this;<br />
				r.Show(); <br />
			} <br />

CODER

Re: loop error

Dave Kreskowiak8-Mar-04 8:08

Dave Kreskowiak

8-Mar-04 8:08

OK. The loop now runs but your references in your if statement are still screwed up. Use this instead:

bool FrmIsOpen = false; 

if (this.MdiChildren.Length > 0)
    for (int i=0; i < this.MdiChildren.Length; i++) 
    { 
        if (this.MdiChildren[i].GetType() == GetType(FrmPassword)) 
        { 
            FrmIsOpen = true; 
            break; 
        } 
    }
}
 
if (!FrmIsOpen) 
{ 
    FrmPassword r = new FrmPassword(); 
    r.MdiParent = this;
    r.Show(); 
}

The first bolded statement was changed because 'this.MDIParent' will always return null if 'this' is an MDIParent. This was changed to checking if the MDIChildren collection has anything in it. In the second bolded statement, the 'typeof()' reference was changed to 'GetType()'. If you have to, you could change this to 'Type.GetType()'. This should take care of your problem.

RageInTheMachine9532

Reading from text file and spliting information into array

lordjpg7-Mar-04 14:04

lordjpg

7-Mar-04 14:04

hey guys,
well this is my problem. I am trying to read a text file ,with information such as these three lines, insert it into the program, then seperate them into a usable format for use. There are about 1000 such lines, but speed is not neccessarily an issue. Thanks for the help.

501,Red_Potion,Red Potion,0,50,,70,,,,,10477567,2,,,,,
502,Orange_Potion,Orange Potion,0,200,,100,,,,,10477567,2,,,,,
503,Yellow_Potion,Yellow Potion,0,550,,130,,,,,10477567,2,,,,,

i was kinda wondering if there was same way to use a multidimentional array where the rows are the text files lines and the columns are the different values.

Re: Reading from text file and spliting information into array

Matthew Hazlett7-Mar-04 16:34

Matthew Hazlett

7-Mar-04 16:34

how about:

ArrayList table = new ArrayList;
SreamReader txtFile = new StreamReader("myfile.txt");

while ((string reader = txtFile.ReadLine()) != null) {
table.add(reader.Split(","));
}

txtFile.Close();

Matthew Hazlett
Windows 2000/2003 MCSE
Never got an MCSD, go figure...

Jpeg 2000 and .NET (C# / VB.NET / C++.NET / J#) ????

gicio7-Mar-04 9:31

gicio

7-Mar-04 9:31

Hi!

does anyone have some experience with Jpeg2000 and .NET ???

can someone give me some code samples how to compress a picture to
Jpeg2000 with .NET ???

and how to show a Jpeg2000 picture although the picture is not loaded
complete??? (show the Jpeg2000 picture with a lower quality).

how to send (upload) DICOM Header of a Jpeg2000 picture???

best regards,

gicio

BITS (Background Intelligent Transfer Service) and .NET ????

gicio7-Mar-04 9:31

gicio

7-Mar-04 9:31

Hi!

does anyone have some experience with BITS
(Background Intelligent Transfer Service) and .NET ???

can someone give me some code samples how to use BITS with .NET ???

regards,

gicio

Re: BITS (Background Intelligent Transfer Service) and .NET ????

Nick Parker7-Mar-04 9:58

Nick Parker

7-Mar-04 9:58

Check MSDN, there are several example articles there.

- Nick Parker
My Blog

Re: BITS (Background Intelligent Transfer Service) and .NET ????

Heath Stewart8-Mar-04 4:18

Heath Stewart

8-Mar-04 4:18

As Nick said, there's several on MSDN. Here's one: Using Windows XP BITS with VS.NET[^]. You can simply search for BITS to find more on MSDN.

Microsoft MVP, Visual C#
My Articles

BITS (Background Intelligent Transfer Service) and SSL and .NET ????

gicio7-Mar-04 9:30

gicio

7-Mar-04 9:30

Hi!!

does anyone some experience with BITS
(Background Intelligent Transfer Service) and SSL and .NET ????

can someone give me some code samples how to use it?

regards,

gicio

Socket Connect Timeout

brian44447-Mar-04 8:28

brian4444

7-Mar-04 8:28

I have several devices on a local network that I talk to. But if a device is turned off, .Connect takes more than 30 seconds to return. How do I get .Connect to timeout, within a second, if the device is not on the network?

Brian

Re: Socket Connect Timeout

Mazdak7-Mar-04 8:36

Mazdak

7-Mar-04 8:36

Socket.SetSocketOption() method

Mazy

"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope

Re: Socket Connect Timeout

brian44447-Mar-04 10:47

brian4444

7-Mar-04 10:47

I set the SocketOptionName.SendTimeout and SocketOptionName.ReceiveTimeout, but it didn't affect the Connnect timeout.

Brian

PasswordBox

The Bug7-Mar-04 7:06

The Bug

7-Mar-04 7:06

Hi, all!

How can I crate TextBox which would display 'circles' instead of '*' in WinXP?

Currently I have TextBox with PasswordChar set to '*' because of I do not know how else I can say that this is a PasswordBox.

I enabled Visual Styles through manifest but it still shows '*'

Thanks.

Regards,
alexx.

Re: PasswordBox

JockerSoft7-Mar-04 7:52

JockerSoft

7-Mar-04 7:52

you can use the dot character (copy and paste one of these)
• ( U+0222 arial)
● ( U+25CF times new roman)

or any other character in the Windows' CharactersMap (unicode section)

Re: PasswordBox

The Bug7-Mar-04 8:12

The Bug

7-Mar-04 8:12

Hello, Claudio!

But in that case I'll got the same char in Win2k and I do not want to.

Thanks.

Regards,
alexx

Re: PasswordBox

JockerSoft8-Mar-04 5:28

JockerSoft

8-Mar-04 5:28

if you want to display the normal asterisk character in a Windows System < win2K
you can use this:

<br />
if ((Environment.OSVersion.Version.Major >= 5) || ( (Environment.OSVersion.Platform == PlatformID.Win32NT) && (Environment.OSVersion.Version.Major == 4) ))<br />
 {<br />
     textBox1.PasswordChar= '•'; //or '●'<br />
 }<br />

bye

Re: PasswordBox

Mazdak7-Mar-04 8:15

Mazdak

7-Mar-04 8:15

Look for TextBox.PasswordChar property. You have to set this property.

Mazy

"A bank is a place that will lend you money if you can prove that you don't need it." - Bob Hope

Re: PasswordBox

Nick Parker7-Mar-04 9:05

Nick Parker

7-Mar-04 9:05

You will have to override the CreateParams and OR the ES_PASSWORD (0x0020) to the Style. Read PasswordBox: A Better Way to Enter Passwords[^] for more details. Smile | :)

- Nick Parker
My Blog

Re: PasswordBox

Heath Stewart8-Mar-04 3:59

Heath Stewart

8-Mar-04 3:59

A simpler way is to set the PasswordChar property. This re-creates the handle of the TextBox with the ES_PASSWORD style.

Microsoft MVP, Visual C#
My Articles

Binding control to an object's property

The Bug7-Mar-04 4:06

The Bug

7-Mar-04 4:06

Hi, all!

I have several controls, bounded to public properties of my Settings class. Those are edit boxes, check boxes and combo. MSDN says that in this case bounded property is updated immedeatly when control's text changes, but I have update is done only after control looases focus...

What is wrong? I want to track changes to Enable Apply button on my form after user changes one of the controls text.

Thanks.

Regards,
alexx.

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