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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.
phpWebNotes is a page annotation system modelled after php.net.
http://webnotes.futureware.biz/demo.php[^]
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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
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Sorry I don't see any Solution for this.
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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 !!
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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."
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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.
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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.
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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
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Hi Glenn. On your Clear button, set the CausesValidation property to false.
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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!??? 
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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! 
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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  . (Yes, I'm aware there are 3rd party Libraries for this, but I hate them)
- The End
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'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
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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!
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I don't trust VB nor the Garbage Collector
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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?
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Infragistics Controls can do this...
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Hi,
I wish to develop a WEB control in .NET ( or know of any such existing control) which works similar to the SQL Server table's data entry sheet.
to be more elaborate:
i will be specifying number of colums for that control.
2 rows with those many columns appears.
i fill in the data. and when i start filling the 2nd row
a 3rd empty row should appear.
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i want to install visual studio .net, but i have a problem, i can`t install ie service pack, i don`t have connection to the internet. is it really true that u need to connect to internet. i`m running the update, copying from a friend. thanks
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System requirements for VS.NET, full page here: http://msdn.microsoft.com/vstudio/productinfo/sysreqs/default.aspx[^]
Visual Studio .NET 2003 can be installed onto any of the following systems:
Microsoft Windows® Server 2003
Windows XP Professional
Windows XP Home Edition¹
Windows XP Media Center Edition
Windows XP Tablet PC Edition
Windows 2000 Professional (SP3 or later required for installation)
Windows 2000 Server (SP3 or later required for installation)
The install can update some packages from the Internet, but it is not required.
R.Bischoff .NET, Kommst du mit?
Great Freeware -> Abilon - Rss Reader | Zip Genius | SmartFTP
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Hello guys,
Say, i need a little cheering up here...
I've been programming in .NET for over two and a half months now. And at this point i've come to the conclusion that i doubt .NET more than i doubt myself. IMHO a pretty dangerous situation. Back in mfc-days i used to spend two days on a problem before turning to internet to see if a MFC bug was involved. Now, in .NET, i turn to internet to see what bugs i can expect before i even put as little as a textbox on a form. Is this normal??
I absolutely adore C#. No doubt. And I must admit that .NET can be an incredibly powerful platform. Moreover, i'm convinced that it once WILL be. So, i will try to hang on to it as long as possible. But then again... boy... am i glad i skipped version 1.0!
Please tell me i'm wrong!
Ok, a few examples:
- A textbox without a border cuts off the lower parts of characters like y, p and g. Mainly in fontsize 11 with AutoSize turned ON.
- Listviews don't display item images when put on a usercontrol in a usercontrol. And the headers have serious painting errors.
- Listboxes don't always fire their click events.
- Tabpages cannot be disabled or hidden.
- When i move a project to another location, i always do a complete rebuild. Of the project itself and of any other projects involved. Compiles with no errors. Two weeks later, for no apparent reason, the program crashes on the exception that there are no appropriate resources compiled into the control. Rebuild all... no errors! Run it... and crash!!
- Every now and then controls dissapear from the designer. Takes a few rebuilds and IDE restarts to get them back on... most of the time... yet not always.
- I need a virtual listview... nope. The solution? Unwrap the .NET control piece by piece until it is stripped to the bare Win32 control and use the API and messages like we used to. Only... this time lookup the old header files to get all the constants, change "defines" into "const int", don't forget the WndProc and spend another hour packing all the structs into the right marshalling format. ALL my controls have at least two platform invokes!! And this is the only solution that is proposed over and over again. Everywhere you look for answers, they always boil down to "strip the .NET part and start programming like you used to...". But is that a future-stable solution?
- Some scrollbars are XP, while others stay Win95. Or was that Win3.11? And scrollbars tend to lie if you ask them if they are visible or not.
- A simple picturebox has no scrollbars!!
- When i start my old MFC software, ALL the controls and dialogs obey to the XP themes and colours. But not my .NET application!!?? I know, i know...
Application.EnableVisualStyles();
I DO that! Nevertheless, textbox backgrounds fail, and some dialogs too! While the least i had expected was to have visual consistency!
And these are only a few among many.
.NET is supposed to be the platform that rockets you into writing stable and gui-intensive software. Well... maybe... once it's debugged.
Ok, i'll stop nagging. Just please, tell me i'm wrong!
Thanx for bearing with me 
Grtz,
Philippe
Philippe Dykmans
Software developpement
University of Antwerp
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