Printing - C# Discussion Boards

James T. Johnson27-Mar-02 19:57

27-Mar-02 19:57

The style of the MS samples is what MS proposes as the standard (of course). The only change I've made that I'm aware of is I prefix private variables with _.

I stick to one public class or public struct per file, excluding structs created for P/Invoke. If an enum is only used by a class/struct I stick it in the same file at the bottom of the file. Some say I should make an enum part of the class if it is only used by that one class -- public class foo { public enum bar { ... } ... } -- but I like it being separate so if a later piece of code needs it I don't have to change all references to the typename.

Take my standards with a grain of salt though, I'm the only person reading (most of) my source :-P

James

Sonork ID: 100.11138 - Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

Re: Coding Standard and Code Review

Kevin McFarlane28-Mar-02 7:59

Kevin McFarlane

28-Mar-02 7:59

Well, you can use the official .Net Design Guidelines as a starting-point.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconnetframeworkdesignguidelines.asp

Kevin

Wierd collection problem

27-Mar-02 7:05

I have a class derived from CollectionBase that is giving me some wierd results. Whenever I add an object to the class, the List goes through my objects and changes all of them to equal whatever value(s) the new added object has.

I'm simply using the standard List.Add() method for my Add implementation. Why would it change all other objects in the collection to equal the added object?

Re: Wierd collection problem

Andy Smith27-Mar-02 7:14

Andy Smith

27-Mar-02 7:14

I suggest you get ColGen2 from gotdotnet.com

It's a collection generator that does all this for you.

Complex configuration files

Michael Groeger27-Mar-02 6:59

Michael Groeger

27-Mar-02 6:59

I am currently trying to set up a complex configuration file which
might look like this:

<configuration>
<configSections>
<sectionGroup name="MyGroup">
<section name="MySection"
type="System.Configuration.NameValueSectionHandler />
</sectionGroup>
</configSections>

<MyGroup>
<MySection>
<component id="1" start="0" length="2" default=""/>
<component id="2" start="2" length="10" default=""/>
[...]
</MySection>
<MyGroup>
</configuration>

So, how can I read all elements of MySection ? How can I access them ?
For your information, the id's aren't always starting with 1, they may
start with 500 or something like that.

Regards,
Michael

how to preserve background after invalidate?

Rüpel27-Mar-02 3:36

Rüpel

27-Mar-02 3:36

hi,

i'm doing some rect-invalidate-update-paint things. it works quite well with one exception:

the painting process is flickering, because the invalid rectangle is filled with the background-color first. does someone know, where i can turn that off?

i'm relatively new to C# and that class library. i hope it's just a matter of finding the right property...

thx in advance Smile | :)

:wq

Associated Files

Nick Parker27-Mar-02 2:38

Nick Parker

27-Mar-02 2:38

Does anyone know of a method to return a list of files that a current executable is using? I will be doing this in C# but would like to get some input from anyone. Thanks in advance.

Nick Parker

Printing

Mazdak27-Mar-02 1:41

Mazdak

27-Mar-02 1:41

I use this code for printpage:

private void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
  int x = e.MarginBounds.Left+70;
  int y = e.MarginBounds.Top;
  try
  {
   for (int i=0;i<100;i++)
   {
      e.Graphics.DrawString( i.ToString(), new Font("Arial", 10), Brushes.Red, x, y);
      y+=15;
      if (y >= e.MarginBounds.Bottom)
      {
	  e.HasMorePages = true;
	  return;
      }
  }
  e.HasMorePages = false;
 }
  catch(Exception myE)
  {
    MessageBox.Show("Problem!!" + myE.ToString());
  }
		
}

The problem is now I don't have two page from 1 to 100,my both pages in printpreview are the same and it draw second page the same as first one,not proceed it.
I hope it is clear.

Thanks

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Re: Printing

Rüpel27-Mar-02 1:52

Rüpel

27-Mar-02 1:52

isn't that function called each time you print a page? and it is starting each time with i=0. so it appears correct to me, that each page looks the same.

in fact: i'm wondering why it doesn't print infinitely

when printing the second page, you should start the i-loop where the one for the first page stopped.

...but i'm new to c# and the corresponding class library... Roll eyes | :rolleyes:

:wq

Re: Printing

Mazdak27-Mar-02 1:56

Mazdak

27-Mar-02 1:56

Rüpel wrote:
isn't that function called each time you print a page? and it is starting each time with i=0. so it appears correct to me, that each page looks the same.

Yes,I know it and I beleive you are right,but how can I solve it,my code is just simple example,in more complecated text its not like this.

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

string array

Mazdak26-Mar-02 21:27

Mazdak

26-Mar-02 21:27

I add this member to mny class:

private string[][] lines;

Then in one function I use this:

for(int i=1 ; i < myDataView.Table.Rows.Count ; i++)
{
	for(int j=0 ; j < myDataView.Table.Columns.Count ; j++)
	{
	lines[i][j]= "mazy";
	}
}

But for the line 'lines[i][j]= "mazy";' I got unhandled error:

Object reference not set to an instance of an object.

What I missed for string[][]?

Thanks

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

Re: string array

SimonS26-Mar-02 21:48

SimonS

26-Mar-02 21:48

You aren't initialising the jagged array.
MSDN:
Before you can use myJaggedArray, its elements must be initialized

From the look of your code, you might find a multidimensioned array more useful. Here's the construct:

<br />
private static string[,] lines= new string[10,100];<br />

Cheers,
Simon

X-5 452 rules.

Re: string array

Mazdak26-Mar-02 22:09

Mazdak

26-Mar-02 22:09

Thanks,It works now Smile | :)

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

backup

BLaZiNiX26-Mar-02 19:01

BLaZiNiX

26-Mar-02 19:01

I want to create a Backup program for my PC and I want to know how can I write into a file all the filepath I backuped and all the data of each of these files. I want to write all that thing in one file and after I want to reopen the file I created and restore all the the path with the associated data to his correct place (the same path as in the file I created)

Thanks a lot
Jonathan

Re: backup

James T. Johnson26-Mar-02 23:10

James T. Johnson

26-Mar-02 23:10

That all depends on how your program is structured Smile | :)

If you are just starting what I would do is create a single class or struct that represents one file in the back up. Give it the Serializable attribute and implement ISerializable.

When you implement ISerializable there are two things you must do: 1) provide a GetObjectData method, which puts the data into the serialization stream (ie a file) 2) provide a constructor that takes the same parameters as GetObjectData, except this takes the data out of the file and loads your class.

When you serialize the class (GetObjectData is called) store the original path/filename and then load the contents of the file in there. When you deserialize the class (the constructor is called) you pull out the original path/filename and then take the data out of the stream and place it in the file.

Then all your program has to do is manage these objects Smile | :)

James

Sonork ID: 100.11138 - Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

Re: backup

BLaZiNiX27-Mar-02 15:35

BLaZiNiX

27-Mar-02 15:35

do you have a sample code, i'm not familiar with this knid of stuff ?

Thanks

Re: backup

James T. Johnson27-Mar-02 18:09

James T. Johnson

27-Mar-02 18:09

I don't have anything premade but I can come up with a general solution that will need a little tweaking Smile | :)

[Serializable()]
public class BackupFile : ISerializable
{
	private string _filename = "";
	private byte[] _filedata = null;
 
	public string Filename
	{
		get { return _filename; }
		set { _filename = value; }
	}
 
	public byte[] FileData 
	{
		get { return _filedata; }
		set { _filedata = value; }
	}
 
	// Don't allow default constructor use
	private BackupFile() { }
 
	public BackupFile(string filename)
	{
		Filename = filename;
		FileData = null;
	}
 
	public BackupFile(SerializationInfo info, StreamingContext context)
	{
		byte [] tempB = new byte[1];

		Filename = (string) info.GetValue("filename", typeof(string));
		FileData = (byte[]) info.GetValue("filedata", temp.GetType());
 
		WriteFileToDisk();
 
		FileData = null; // "free" the memory used by the file
	}
 
	public void GetObjectData(SerializationInfo info, StreamingContext context)
	{
		FileData = LoadFileFromDisk();
 
		info.AddValue("filename", Filename, Filename.GetType());
		info.AddValue("filedata", FileData, FileData.GetType());
 
		FileData = null;  // "free" the memory used by the file
	}
 
	private void WriteFileToDisk()
	{
		// Open the file specified by Filename and write the bytes stored in 
		// FileData to it
	}
 
	private void LoadFileFromDisk()
	{
		// Open the file specified by Filename and copy the data from the stream
		// to FileData
	}
}

Now you may wish to also offer compression as well, there is a .NET implementation of gzip/zip available at ICSharpCode.NET.

The compression library is GPL, but there is an exception that reads "As a special exception, if you link this library with other files to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License."

James

[Edit: AHA! I finally figured out how to get the "extra" linebreaks to appear... They can't be blank lines Smile | :)

Each "blank" line needs a space on it. Pardon me while I celebrate Jig | [Dance]

]

Sonork ID: 100.11138 - Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

Dynamically assign QueryString to SRC?

26-Mar-02 13:02

I have an , I need X to be a string variable that each time it is generated by a method :
void generateX(Obj sender, EventArgs e)
{ X="sth";}
But when I assign <iframe src="sample.aspx?id=<%=X %>" />, it does not work?
How I can pass X value to src of iframe?

Chris#

Re: Dynamically assign QueryString to SRC?

David Wengier26-Mar-02 13:18

David Wengier

26-Mar-02 13:18

make your generateX() routine return a string, and use <iframe src="sample.aspx?id=<%= generateX() %>" />

And why do you have the parameters on generateX?

--
David Wengier

Sonork ID: 100.14177 - Ch00k

Re: Dynamically assign QueryString to SRC?

26-Mar-02 13:44

GenerateX() method has to be void, since it gets called by a listBox control:
onSelectedIndexChanged="GenerateX". This purpose of this method is to generate a sqlWhereClause, X is a public variable I defined in top (outside of this method), and I intended to use X value to pass to an url as querystring. It seems that use my method does not give me anything. But if view source of the web page, I can see the values replaced x in the spot.
Then I tried to put IFrameName.src=".." in GenerateX() method, it said src is not found. How I can make a method return string while I need to have this void function to correspond to an ListBox onChange event?
Any thought may enlight me ! Thanks in advance.

Chris#

Re: Dynamically assign QueryString to SRC?

David Wengier26-Mar-02 13:52

David Wengier

26-Mar-02 13:52

Chris# wrote:
I can see the values replaced x in the spot.

If the value is being inserted into the page properly, but not being passed to the sample.aspx page, then maybe you need to HTMLEncode it first.

--
David Wengier

Sonork ID: 100.14177 - Ch00k

Matlab & C#

26-Mar-02 8:25

Hi,
Does anyone knows how can i insert a matlab code into c#?
Thanks.

Capturing Cursor Keys?

Zombies with Coffee, LLC26-Mar-02 7:54

Zombies with Coffee, LLC

26-Mar-02 7:54

I'm stumped. (I really am a decent MFC programmer, seriously...)

I'm writing a control to move an image around.

If I override KeyDown, I can capture absolutely EVERYTHING except for the four cursor keys. Everything else is captured, shift, control, insert, home, pgup, 'A', etc...

private void Afix_KeyDown( object sender, KeyEventArgs e )
{
switch( e.KeyCode )
{
case Keys.Up:
...;
break;

case Keys.Down:
...;
break;
}
}

What am I doing wrong on the cursor keys?!

Thanks guys!

Re: Capturing Cursor Keys?

James T. Johnson26-Mar-02 8:11

James T. Johnson

26-Mar-02 8:11

You need to override the form's IsInputKey method to tell it that the cursor keys are to be handled as input.

HTH,

James

Sonork ID: 100.11138 - Hasaki
"I left there in the morning
with their God tucked underneath my arm
their half-assed smiles and the book of rules.
So I asked this God a question
and by way of firm reply,
He said - I'm not the kind you have to wind up on Sundays."
"Wind Up" from Aqualung, Jethro Tull 1971

Re: Capturing Cursor Keys?

Zombies with Coffee, LLC26-Mar-02 8:17

Zombies with Coffee, LLC

26-Mar-02 8:17

Thanks James. Works great now.

Here's the code I used to override IsInputKey

protected override bool IsInputKey( Keys keyData )
{
bool bIsInputKey = true;

switch( keyData )
{
case Keys.Left: break;
case Keys.Right: break;
case Keys.Down: break;
case Keys.Up: break;
default:
bIsInputKey = base.IsInputKey( keyData );
break;
}

return bIsInputKey;
}

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