.NET (Core and Framework)

Denn Gott hat die Menschen so sehr geliebt, daß er seinen einzigen Sohn für sie hergab. Jeder, der an ihn glaubt, wird nicht verlorengehen, sondern das ewige Leben haben

20-May-04 17:16

In theory and not practice,
You could implement your own drawing code. Then when you add an item, you will paint a combobox.

protected override void OnDrawItem( DrawItemEventArgs e)

see this article for a reference:
http://www.codeproject.com/cs/combobox/resizablelistbox.asp#xx235952xx

HTH

R.Bischoff

ControlPaint.DrawComboButton()

Victor Boctor19-May-04 15:40

Victor Boctor

19-May-04 15:40

Hello!

The ControlPaint.DrawComboButton() requires the rectangle inside which the button should be painted. Getting the height is easy, since probably it is equal to combobox height. However, what about the width? In my XP Pro machine it is about 19 pixels, but I would rather find a way to get the width rather than hard code it into the code.

I had a look at System.Windows.Forms.SystemInformation, but it doesn't include this information.

Regards,
Victor.

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Plugin Application in c#

DajuBhai17-May-04 20:32

DajuBhai

17-May-04 20:32

Objective: Our Requirement is a Plugin Application in c# (.Net).
Our Proposed Solution Contains a Base Application (.exe), which contains a MDI Sort
Of Windows Form (Parent Form),acting as a Launching Pad & Display Area for our Plugins(dll’s). Basically our all Plugin contains a form and are all together an independent applications, except they are dll’s.
Problem: All the Plugin Forms are to be Opened/embedded into a panel on the Base Application Form. This is something MDI Parent/Child sort of Relationship across the Applications.
Is there any way to accomplish this?
OR Is there other way around to do the same (embedding)?

Regards
Dhanak

Anonymous17-May-04 23:12

Anonymous

17-May-04 23:12

Sorry I don't see any Solution for this.

Aryadip18-May-04 0:11

Aryadip

18-May-04 0:11

Hi,
Herez some tips to develop plugin architechture...

1) Your base application should either be aware of the plugin directory or should read the location of the plugins from an XML file.

2) Use reflection on the plugin DLLs to find the plugin class and invoke methods on it.

3) If you intend to use the plugin as a embedded composite control over a form then make sure that the plugin class is derived from "System.Windows.Forms.UserControl". Use Reflection to create an object of the plugin class. Use "this.Controls.Add()" method to add the plugin object into the form at the specified location.

4) If you intend to use the plugin as an MDI child then make sure the plugin class is derived from "System.Windows.Forms.Form" . Using reflection get the object of the plugin class and then do the following. (consider "objPlugin" the object of the plugin class)

objPlugin.MdiParent = this;
objPlugin.Show();

Hope these tips help you in developing what you intend to. I'm leaving the reflection and other such codes for your imagination.

regards,
Aryadip.

Cheers !! and have a Funky day !!

Philip Fitzsimons18-May-04 3:10

Philip Fitzsimons

18-May-04 3:10

why not:

1) write an IPlugin interface that meets your needs
2) have plugins written as assemblies that derive from 1)
3) load 2) into application domains.

this would be MUCH easier, and considering they are meant to be plugins they will need access to you application data anyway. Also it will be much faster.

"When the only tool you have is a hammer, a sore thumb you will have."

problems with configuration settings

holland_phillip1-Jun-04 9:10

holland_phillip

1-Jun-04 9:10

I have implemented something just like this for my company. I can't give you the code but I can generically describe what I did.

Each plug-in can be a seperate Class Library project. You'll want to create an Interface in another class library project that all plug-in projects can reference. Insert a class into each plug-in class library that implements the interface you created.

When the .exe starts up, it can loop through all the dlls in it's executing directory and check to see if any of the classes (types) in a dll implement the interface you created. If so, you can use reflection to create an instance of that class (type) at runtime and call the appropriate interface methods to "start" that plug-in.

Hope this helps.

Gerda_S16-May-04 21:47

Gerda_S

16-May-04 21:47

I changed my configuration settings (-> Seetings, Control Panel, Adminstrative Tools, Microsoft .NET Framework 1.1 Configuration) because I wanted to execute a C# application from another server. So I declared this server to be a trusted source and then tried to start it. But I got an error message: "Eine Ausnahme 'System.Security.Policy.PolicyException' ist in BUNeu.exe aufgetreten".

If I try to open one of my projects on the laptop then the project is opened, but the sandclock ist running.

If I try to create a new project I get the error message: "execution permission cannot be acquired".

If I try to change the configuration settings I get the error message:
"Snap in failed to initialize.
Name: .NET Framework 1.1 Configuration
CLSID:{127E004-F895-42BE-8070-DF90D60CBB75}

So I can't do anything now. Does anyone can help me with this problem?

Thanks.

Re: problems with configuration settings

TigerNinja_18-May-04 6:05

Denn Gott hat die Menschen so sehr geliebt, daß er seinen einzigen Sohn für sie hergab. Jeder, der an ihn glaubt, wird nicht verlorengehen, sondern das ewige Leben haben

18-May-04 6:05

Gerda_S wrote:
If I try to change the configuration settings I get the error message:
"Snap in failed to initialize.
Name: .NET Framework 1.1 Configuration
CLSID:{127E004-F895-42BE-8070-DF90D60CBB75}

Seems like your snap in is damaged. Look here to remove the snap in
http://support.microsoft.com/?kbid=297064[^]
then repair/reinstall your .NET framework.

HTH

R.Bischoff

Validation Controls Question

gmhanna16-May-04 9:56

gmhanna

16-May-04 9:56

I am developing an application with several validation controls on the screen and the controls are working properly. On the screen I have an OK button, which causes control validation to occur, I also have a CLEAR button, incase the user wants to start over and blank everything out. When the user presses CLEAR, all the fields are set back to their default, "" in many cases. The CLEAR button is causing validation to occur and the user ends up with a bunch of messages saying that these fields can not be blank, in the ValidationSummary control.

The way I have the validation controls setup is to display an * next to the field in error and display the actual message in the Validation Summary.

I tried setting ShowMessages in the validation summary to false, but the * still show up next to the fields. Any idea how to turn off all validation if the CLEAR button is pressed?

Thank you,

Glenn

Re: Validation Controls Question

Mike Ellison18-May-04 20:07

Mike Ellison

18-May-04 20:07

Hi Glenn. On your Clear button, set the CausesValidation property to false.

HELP! Reading Files...

mikasa15-May-04 12:23

15-May-04 12:23

Ok, in no way am I a N00b at reading files! However, I was debugging some code today in which I was using a IO.StreamReader to read the text from a file and using an IO.StreamWriter to write it into a different file.

This file is about 3.2MB. The StreamReader DOES return the Correct Length of the File (IO.StreamReader.BaseStream.Length). HOWEVER, while reading the file, the Stream THINKS it has reached the end, and like a good little programmer, I Flush the StreamWriter (BTW, I am flushing every 8096 Bytes - yes, that IS a lot of water!) but I am missing a HUGE chunk of data at the End of my file!

I have noticed that the IO.StreamReader.BaseStream.Position is usually TOTALLY different than the Sum of the Bytes returned for each re-iteration of retrieving data. For example, reading in 8096 Bytes at a time, when my Position variable thinks it's at 16,192, the BaseStream has it's internal buffer set to some other amount... Is this what's messing it up?

Notice however, it I REALLY want to waste a lot of memory and processing time, I can just read it all in at once (IO.StreamReader.ReadToEnd) and then process it....GreeeEEEAAAaaaat!!! Just what I want! NOT!!!

So...what the @%$* is going on!??? How do I read the rest of the data!??? WTF | :WTF:

mikasa15-May-04 12:40

15-May-04 12:40

Wait a tick, it gets even better! I just discovered that it's Reading past the end of the File and returning more data than it should!

So, I know I need to use this handy-dandy Routine MS gave us: IO.StreamReader.DiscardBufferedData(). Soo, anyone have a clue as to how this should be done?? Any examples? Becuase the Help doesn't...well, help! Confused | :confused:

mikasa15-May-04 12:59

15-May-04 12:59

Ok, I found the answer to this. I'm sure most of you do not need this functionality and only use "ReadLine"... However, try parsing ANSI 835 files Poke tongue | ;-P

. (Yes, I'm aware there are 3rd party Libraries for this, but I hate them)

- The End Poke tongue | ;-P

TigerNinja_20-May-04 8:34

Denn Gott hat die Menschen so sehr geliebt, daß er seinen einzigen Sohn für sie hergab. Jeder, der an ihn glaubt, wird nicht verlorengehen, sondern das ewige Leben haben

20-May-04 8:34

mikasa wrote:
Ok, I found the answer

So can you kindly share your solution with the CPians ?

Thanks.

R.Bischoff

mikasa20-May-04 8:46

20-May-04 8:46

Sure thing, just curious if anyone would reply Poke tongue | ;-P

'Function to Read a File into Cache so RegEx can be Performed
Private Sub CacheFile(ByVal File As String)
	Dim ioReader As IO.StreamReader
	Dim vBuffer() As Char
	Dim hResult As Integer

	'Exit if the File does not exist
	If (File = "") Then Return
	If (Not IO.File.Exists(File)) Then Return
	If (Me._File <> File) Then Me._File = File Else Return

	Try
		'Initialize the Cache
		_Cache = Nothing : _Cache = New System.Text.StringBuilder(8096)

		'Read the File
		ReDim vBuffer(8096)
		ioReader = New IO.StreamReader(File, System.Text.Encoding.UTF8, True, 8096)
		hResult = ioReader.Read(vBuffer, 0, vBuffer.Length) 'Read More Data
		While (hResult > 0)
		     'There is a bug with a StreamReader.  Sometimes more data is read than is neccessary.
		     'If these are the Last Bytes of data, only read up to the hResult
		     If (hResult < vBuffer.Length) Then _Cache.Append(vBuffer, 0, hResult) Else _Cache.Append(vBuffer, 0, vBuffer.Length)

		     hResult = ioReader.Read(vBuffer, 0, vBuffer.Length) 'Read More Data
		End While

	Catch ex As Exception : MsgBox(ex.ToString)
	Finally
		Erase vBuffer
		If (Not IsNothing(ioReader)) Then ioReader.Close() : ioReader = Nothing
	End Try
End Sub

Colin Angus Mackay23-May-04 2:00

Colin Angus Mackay

23-May-04 2:00

In your code you have:

_Cache = Nothing : _Cache = New System.Text.StringBuilder(8096)

Isn't the first statement somewhat redundant?

"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

The Second EuroCPian Event will be in Brussels on the 4th of September

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

mikasa23-May-04 6:51

TreeView - Howto add Controls?

23-May-04 6:51

I don't trust VB nor the Garbage Collector Poke tongue | ;-P

mgaerber14-May-04 9:23

mgaerber

14-May-04 9:23

Hi,

most of us have read articles about list views
with controls like Textbox etc. added for editing functionality. This is nice but not sufficient if you want to cleanly display hierachical data.

Any suggestions on how to implement something similar with the TreeView?

For example a subnode would not be simple TreeNode but something like a Panel or similar on which one could put a TextBox for data input?

Re: TreeView - Howto add Controls?

mikasa15-May-04 13:00

Re: TreeView - Howto add Controls?

15-May-04 13:00

Infragistics Controls can do this...

TigerNinja_18-May-04 19:14