Re: System.Drawing Problem - C# Discussion Boards

Re: Functions and references

8-May-04 19:20

Nothing useful? How about reading the .NET Framework SDK[^] for starters, not to mention any number of the countless books out there about the .NET Framework and the languages that target it, like C#? It's how many of us learned.

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surgeproof10-May-04 4:50

surgeproof

10-May-04 4:50

thanks. will try Smile | :)

surgeproof

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Working with XML file

Alex Getman7-May-04 5:35

Alex Getman

7-May-04 5:35

Hi to all,
Can somebody tell me some usefull links where I can get help for working with XML files. In my WinForm application I creating xml file and wite some data to it. But when I lauch my program again it rewrites the existing file. How can I do that new nodes would be written to the end of the document? And also I want to read all these nodes, what is the best way to them all, one for one? Thanx.

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Re: Working with XML file

TigerNinja_7-May-04 8:35

TigerNinja_

7-May-04 8:35

Everything you need to know is under the System.Xml[^] namespace.

Basically, you want to check if the .xml file exists, if so you want to insert your new data, if not create a new .xml file. Don't create a new file everytime, you'll write over your data.

The bulk of your methods might come from this class, XmlTextWriter[^]

Good luck.

R.Bischoff
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System.Drawing Problem

Russell Jones7-May-04 4:29

Russell Jones

7-May-04 4:29

I'm really confused.

I'm new to forms in c#, but i have used c# and forms before, just not together.

i want to draw a rectangle on the screen so i used this code in a button click event

Pen NewPen = new Pen(Color.Red,10);
Graphics g = this.CreateGraphics();
g.DrawRectangle(NewPen,200,200, 50,50);

this does exactly what i would expect, but it's not very interesting so i added some lines:

Pen NewPen = new Pen(Color.Red,10);
Graphics g = this.CreateGraphics();
int X = this.Width/2;
int Y = this.Height-100;
g.DrawRectangle(NewPen,X,Y, 50,50);
Now i don't get the rectangle, but if i step through the code i can see a flash as it gets drawn and then when the form is displayed it dissappears.

I revert to the original code and now that doesn't work either, but if i paste the code into a new project it works fine.

has anyone seen anything like this before?

I'm really confused, any help would be appreciated

russ

Re: System.Drawing Problem

Mike Dimmick7-May-04 4:48

Mike Dimmick

7-May-04 4:48

Perhaps you've turned double-buffered drawing on?

As a general rule, you shouldn't paint anything in response to a command. Instead, you should 'remember' (somehow) what needs to be painted, then paint it when Windows asks you to. Override the OnPaint method to handle this notification and do your painting.

Stability. What an interesting concept. -- Chris Maunder

Re: System.Drawing Problem

Heath Stewart7-May-04 4:51

Re: System.Drawing Problem

7-May-04 4:51

You have to override OnPaint (in a derivative class) or handle the Paint event (from a different class) and draw your rectangle based on some state variable (perhaps the Button.Click handler sets some variable to true, and your override for OnPaint draws a rectangle if that variable is true. If you don't, then each time the form (or any surface) is invalidated, your rectangle will disappear. So, in your form you'd do something like this:

protected override void OnPaint(PaintEventArgs e)
{
  base.OnPaint(e);
 
  Graphics g = e.Graphics;
  // Draw with 'g'.
}

Also, if you ever create a Graphics object or a Bitmap or something, dispose of it (i.e., call Dispose) when you're done to release the native resources used by the class, otherwise you'll see a drop in performance after a while since memory isn't being freed (in some cases, not freed cast enough). Do not do this in the override for OnPaint or a Paint event handler, however - the caller will dispose the Graphics object when finished.

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Russell Jones10-May-04 3:33

Russell Jones

10-May-04 3:33

thanks for the help, i'm putting it into the on_paint method.

i had realised that there was a painting issue going on, the cause of the confusion was the break point forcing a redraw of the form, but it took me a while to work that out.

for some reason i'd thought 2d drawing would take care of redraws etc by itself.

thanks again

russ

String

bertcox7-May-04 3:17

bertcox

7-May-04 3:17

If i have a string like this :

string test = "<session> <appservers/> <parameters> <runtimestatistics>true" + "</runtimestatistics> <dateformat>dmy</dateformat> <sessionyearoffset>1980 " + "</sessionyearoffset> </propathwin32> <runprogram /> </parameters> <packages>"

Is it possible to check whether "runprogram", "parameters", "appservers" are in the string
With Indexof you can only check for one string: IndexOf("runprogram",0)

So i want to check whether several words are in a string
(actually i want to check whether my program can open the xml-file, so if those words are not in the xml-file then my program can't work)

Thx in advance

Heath Stewart7-May-04 3:31

7-May-04 3:31

You could always load this string into an XmlDocument using the LoadXml method, or use a StringReader and then pass that to an XmlTextReader's constructor overload.

However, a better way is to use XML in a way it's intended - using schemas. You should define a schema with a namespace and you can always validate if that XML document uses that namespace. If you can't change the schema, then simply use an XmlValidatingReader to read-in the XML document and embed a schema that matches the XML document structure you require. If the XML document doesn't validate against the schema, then don't use it.

Besides, nothing says you can't load the XML document to check what elements are present. If they aren't, don't continue to process the document. The XmlValidatingReader is the best way to go, however.

Microsoft MVP, Visual C#
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Jeff Varszegi7-May-04 4:20

Jeff Varszegi

7-May-04 4:20

I'd just add that the string isn't XML, but it is XML-like. Maybe the poster should first investigate the use of XML as a better solution to the problem at hand... Unsure | :~

-Jeff

here, bloggy bloggy

Heath Stewart7-May-04 4:25

7-May-04 4:25

I guess I didn't look that closely, but your right! Of course, it often seems that we aren't provided with full details on this forum to help answer questions. I just "love" it when someone provides no details and asks why something doesn't work! Roll eyes | :rolleyes:

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Jeff Varszegi7-May-04 4:45

Jeff Varszegi

7-May-04 4:45

I'm not saying you're wrong, just that I think maybe you should point the person to a good starting place for learning how to even use XML properly. They're pretty clearly going for XML, they're just not getting there. Smile | :)

-Jeff

here, bloggy bloggy

Heath Stewart7-May-04 4:47

7-May-04 4:47

I wasn't implying that you said I was wrong, just making a statement that I didn't even notice it wasn't well-formed.

In any case, me a couple other people have given this guy plenty of information about XML. One can only do so much - the rest is up to the poster. Smile | :)

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Advance Toolbar control in C#

Bitwise Gamgee10-May-04 4:51

Bitwise Gamgee

10-May-04 4:51

If the words must occur in a specific order, a matching pattern can be specified with a regular expression.

You could make use of the Regex class ...

if (Regex.IsMatch(test, @"runprogram.*?parameters.*?appservers", RegexOptions.IgnoreCase)) ...

lawtoyou7-May-04 1:03

lawtoyou

7-May-04 1:03

I created WinMainForm that setted IsMdiContainer=True and added toolBar to WinMainForm in MainProject (that compile to exe).
And I created WinParentForm in ParentProject (that compile to dll).

For example
public class WinMainForm : System.Windows.Forms.Form
{
...
private void openParent_Click(object sender, System.EventArgs e)
{
ParentProject.WinParentForm FormA = new ParentProject.WinParentForm();
FormA.MdiParent = this;
FormA.Show();
}
...
}

About that How can I control the toolBar (in MainProject.WinMainForm) from FormA (in ParentProject.WinParentForm) ?

Re: Advance Toolbar control in C#

Heath Stewart7-May-04 3:24

Re: Advance Toolbar control in C#

7-May-04 3:24

If you're looking for an OLE-like way where the toolbar and/or menu updates depending on the current window (or other object), then you should use an interface that objects should implement with a method to pass either the main form's ToolBar or some other similar mechanism. This is more of a provider-based approach, which is far more common in commercial grade applications and is essentially what you see in applications like Microsoft Office and other ActiveX containers like Internet Explorer (which gains the Office buttons when an Active Document like Word Documents are opened inside it).

This also gives you an abstract designer so you don't have to use circular dependencies. Just define that interface in a common DLL that both projects reference (or even in the DLL project you already mentioned - just not in the EXE project since VS.NET can't reference an EXE assembly, even though the command-line compiler can).

Microsoft MVP, Visual C#
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lawtoyou7-May-04 3:33

lawtoyou

7-May-04 3:33

Can you give me simple or demo project ?

Re: Advance Toolbar control in C#

Heath Stewart7-May-04 3:41

Mobile phone controlling...

7-May-04 3:41

It's not hard. This is what development is about - researching problems and solutions, designing the solution, and then writing the solution.

Simply define an interface, like IToolBarProvider which has a property or method that takes a ToolBar as a param. Your WinParentForm would implement this interface. WinMainForm - in an override to OnMdiChildActive for example - would reset the toolbar back to the default, determine if the child window class implements the interface, then passes the toolbar to the implementation for it to modify, something like this:

protected override void OnMdiChildActivate(EventArgs e)
{
  base.OnMdiChildActivate(e);
  IToolBarProvider tbProvider = ActiveMdiChild as IToolBarProvider;
  if (tbProvider != null) tbProvider.ModifyToolBar(ToolBar tb);
}

In a separate DLL project (or the one that already defines the MdiParentForm, define the interface like so:

public interface IToolBarProvider
{
  void ModifyToolBar(ToolBar tb);
}

It's a very simplistic example, but you should get the idea and explore it further.

Microsoft MVP, Visual C#
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mikker_1236-May-04 23:34

mikker_123

6-May-04 23:34

Is there any kind of tutorial/source code/anything for C# similar to softwer on this link => http://fma.sourceforge.net

It's mobile phone controlling over your PC and other way around...

Any response is highly appreciated Smile | :)

Heath Stewart7-May-04 3:17

7-May-04 3:17

If you want to know how what their source code looks like, browse their CVS repository[^] and write your own code. But why do what's already been done? It's GPL'd, so it's free software (as everything on SourceForge seems to be, though some licenses may be more restrictive).

Microsoft MVP, Visual C#
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OMalleyW7-May-04 4:56

OMalleyW

7-May-04 4:56

where do you get an add-in for Visual Studio Pro 2000?
I looked on MS website but didn't find a download... maybe I missed it..

Thanks
Will

Heath Stewart7-May-04 4:57

7-May-04 4:57

An add-in for what?

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