C# Discussion Boards - CodeProject

jtmtv1810-Jan-03 13:22

10-Jan-03 13:22

whats the easyest way too adjust a track bar value from 1 too 100, into a double starting at 1.0 and working its way down to .0001 (for form opacity).
i have it working with a huge switch, but i want a cleaner way to take the int value of say 100 too the double value of .0001

Re: track bar int too double ?

David Stone10-Jan-03 13:39

David Stone

10-Jan-03 13:39

form.Opacity = (double)trackBar.Value / 1000000;

I think that should work... Unsure | :~

I don't know whether it's just the light but I swear the database server gives me dirty looks everytime I wander past.
-Chris Maunder

Microsoft has reinvented the wheel, this time they made it round.
-Peterchen on VS.NET

Re: track bar int too double ?

jtmtv1810-Jan-03 14:10

jtmtv18

10-Jan-03 14:10

thanks alot =) you just gave me back 200 lines of code i bet.. (it looks like that would work too me too...)

im going too school as we speak to get my mcsd from a microsoft certified school.. for someone trying to become a windows app programmer (eventually games) is this a good start ?

Re: track bar int too double ?

David Stone11-Jan-03 5:57

David Stone

11-Jan-03 5:57

Actually, I would look at this article instead. It seems to work:

http://www.codeproject.com/csharp/transparentwindowsincsharp.asp[^]

I think Game Dev would be better done in C++. You can do it in C#, but I haven't really seen a game written in C# aside from Chris Sells' Wahoo[^]

Re: track bar int too double ?

stephen woolhead10-Jan-03 15:32

stephen woolhead

10-Jan-03 15:32

That will not work...

1 = 0.000001
100 = 0.0001

Depends if you want a linear function or a power function see

http://www.perfectphase.com/store/slider.gif[^]

Stephen.

Re: track bar int too double ?

David Stone11-Jan-03 5:58

David Stone

11-Jan-03 5:58

You're right. I should have just done this:

Form.Opacity = trackBar.Value / 100;

Aborting updates in a DataTable

stephen woolhead10-Jan-03 12:43

stephen woolhead

10-Jan-03 12:43

I am having a problem with aborting updates in a DataTable.

I am hooked into the RowChanging Event and, as the docs say, throwing an exception to cause the update to abort.

My problem is that the DataSet does not catch this exception and it bubbles all the way up to Main() which is a bit to late to do anything with.

For this example I have a single form with a ListBox and a TextBox bound to a strongly typed DataSet.

Anyone know how to handle this situation

Thanks

Sttephen.

Re: Aborting updates in a DataTable

jtmtv1810-Jan-03 13:28

jtmtv18

10-Jan-03 13:28

could you try butting your listbox on a seperate thread and abort the thread ? or maybe try putting the update in a while statement with a bool.... ie.
it would be a pain too do it with the while statement though cause it would stay in it until the update tells it not too. i would try threads.

while(turnOffUpdateflag==false)
{
;//do my update
}

while(myThread.IsAlive == true)
{
;//do update
}

Re: Aborting updates in a DataTable

stephen woolhead10-Jan-03 13:57

stephen woolhead

10-Jan-03 13:57

<shudder>

There as to be a better way!

I am trying to validate the row when the list changes to a different row. This triggers the RowChanging event from the dataset. If I create the ListBox on another thread, when I abort the thread, surely I would lose the list box as well, and would have to recreate it and restore it to it's current state.

15 minute project has now managed to waste the best part of a day!!

This looked so simple when I read the docs. LOL, should have known better by now! Wink | ;-)

Stephen.

Re: Aborting updates in a DataTable

jtmtv1810-Jan-03 14:19

jtmtv18

10-Jan-03 14:19

i have a encryption program with the encryption method....the recursive file search method..all running on a string... when the user clicks stop..... it cancels the threads ..and the results that were found before the thread stopped are still in the list box... then when the user clicks the search button agian i tell the program too recreated the thread agian and it startes over

any time you abort a thread you have to reintialize it ie
make a private void just for your threads so you can call on then and get them reintialized when ever needed.
i have never used a datagrid before (isnt that what you are using? cant remeber) but this has always worked for listboxes atleast.

private void mylistboxThread()
{
Thread Update = new Thread(new ThreadStart(updatefunctions))
}

private void updateFunctions()
{
//put your update code here.
}

Update.Start();//start thread
Update.Abort();//abort thread

jesse m Smile | :)

Re: Aborting updates in a DataTable

stephen woolhead10-Jan-03 15:42

stephen woolhead

10-Jan-03 15:42

But you are in control of starting the thread. What I want to do is in response to a users click on the listbox, which will be triggered from an incoming windows message (WM_MOUSE_DOWN or what ever) via the forms message loop that is running on the forms main thread, therefor my thread of execution would never make it onto my thread.

Make sense?

Stephen.

Version number in deployment app

Bog10-Jan-03 12:24

Bog

10-Jan-03 12:24

I'm making a deployment msi in VS.net, and I want to make the registry entry for the app be:

HKEY_CURRENT_USER
Software
[Manufacturer]
[ProductName]
v[Version]
myvariablehere

what happens is, Manufacturer and ProductName get replaced as they should, but version just gets "v" without the version number after it. I also tried just "[Version]" but that didn't work either. Am I doing something wrong or can you not write the version into the name?

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

MDI apps fullscreen without border?

capiscan10-Jan-03 11:53

capiscan

10-Jan-03 11:53

hey What's up?

Okay I am trying to simulate the login screen that XP uses. Each opacid login box will be it's own form so i can control the opacity. The background form will be the MDI container for all the login forms.

But I don't want the border ARRGGGG around the entire MDI container!!!

Someone help....

Peace.

Rubber band drawing in GDI+

Jojje10-Jan-03 7:53

Jojje

10-Jan-03 7:53

Wonder how to make a rubber band drawing with GDI+ in C#.
Have used SetROP2( R2_XORPEN ) in C++ before, but that little function seemes to be gone in GDI+.
Have tried to use interop with GDI, but there are quite a few functions that needs to imported and beeing lazy I want to know if there is a simpler way.
Unsure | :~

Re: Rubber band drawing in GDI+

stephen woolhead10-Jan-03 13:11

stephen woolhead

10-Jan-03 13:11

Have you had a look at http://www.codeproject.com/dotnet/rubberbandline.asp[^]

Stephen.

Re: Rubber band drawing in GDI+

Jojje11-Jan-03 1:18

Jojje

11-Jan-03 1:18

Thanks for the help. I thought I had looked everywhere, but apperantly not.
Big Grin | :-D

Find & Copy part of string

Steve McLenithan10-Jan-03 6:52

Steve McLenithan

10-Jan-03 6:52

I have a string that will have a negative number as either the first 2 or 3 characters of it (including negative sign) immediately following this there is a colon :

How can I copy everything before this initial colon into another variable. Confused | :confused:

Reason for this: I need to perform some mathematical manipulation on this value but there is no way for me to get at it but via string because of the special characters.

Thanks

********************
* $TeVe McLeNiThAn
********************

Re: Find & Copy part of string

leppie10-Jan-03 6:59

leppie

10-Jan-03 6:59

int GetNumberBeforeColon(string text)
{
  string[] arr = text.Split(':');
  return Convert.ToInt32(arr[0]);
}

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Re: Find & Copy part of string

Steve McLenithan10-Jan-03 7:02

Steve McLenithan

10-Jan-03 7:02

That's what it is. Thank you so much. I have done the same thing before but couldn't remember it exactly.

Thanks again! Big Grin | :-D

********************
* $TeVe McLeNiThAn
********************

delegate ordering

Shaun Wilde10-Jan-03 5:15

Shaun Wilde

10-Jan-03 5:15

Hi all

Is that possible to rearrange the order of delegates attached to an event and/or is it possible to enumerate them (without firing them)

thankx

Re: delegate ordering

Nick Parker10-Jan-03 5:58

Nick Parker

10-Jan-03 5:58

Could you give an example of what you are trying to implement?

Nick Parker

You see the Standards change. - Fellow co-worker

Re: delegate ordering

Shaun Wilde10-Jan-03 6:06

Shaun Wilde

10-Jan-03 6:06

its not me - but I'll try and explain

a friend is adding a delegate to an event which already has other handlers on it - what he wants to do is put his handler to run first and then let the others go

Technically speaking the dictionary would define Visual Basic users as programmers.
But here again, a very generalized, liberal definition is being employed and it's wrong
- just plain wrong - Tom Archer 5/12/02

Re: delegate ordering

leppie10-Jan-03 6:07

leppie

10-Jan-03 6:07

From MSDN (I didnt think it is possible but it appears so)

A MulticastDelegate has a linked list of delegates, called an invocation list, consisting of one or more elements. When a multicast delegate is invoked, the delegates in the invocation list are called synchronously in the order in which they appear. If an error occurs during execution of the list then an exception is thrown.

public override Delegate[] GetInvocationList(); Thats seems the one Smile | :)

WebBoxes - Yet another collapsable control, but it relies on a "graphics server" for dynamic pretty rounded corners, cool arrows and unlimited font support.

Export to Excel Problem

Jassim Rahma10-Jan-03 0:10

Jassim Rahma

10-Jan-03 0:10

I'm using the following code to export from a database to Microsoft Excel but I have one problem: The first record in the database is not getting exported correctly, any one can tell me why?

Many Thanks,
Jassim Rahma

string myConnString = ConnectionString;

OdbcConnection cn = new OdbcConnection(myConnString);
cn.Open();
cn.ChangeDatabase(TableName);

DataSet ds = new DataSet();
OdbcDataAdapter da = new OdbcDataAdapter(SQLstatement, cn);

da.Fill(ds, TableName);

if (MessageBox.Show("Do you want to Export the data?", "Export", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{

string MyString;

StreamWriter myTextStream = new StreamWriter(txtOutput.Text);

for (int i= 0; i < ds.Tables[0].Columns.Count-2; i++)
{
MyString = ds.Tables[0].Columns[i].ToString() + ", ";
}

MyString = ds.Tables[0].Columns[ds.Tables[0].Columns.Count-1].ToString();

myTextStream.WriteLine(MyString);
MyString = "";

System.Data.DataTable tb = ds.Tables[0];

for (int i = 0; i < tb.Rows.Count-1; i++)
{
System.Data.DataRow dr = tb.Rows[i];
for (int j = 0; j < dr.Table.Columns.Count-2; j++)
{
MyString = MyString + dr[j].ToString() + ", ";
}
MyString = MyString + dr[dr.Table.Columns.Count-1].ToString();
myTextStream.WriteLine(MyString);
MyString = "";
}

myTextStream.Close();
myTextStream = null;

Process p = new Process();
System.Diagnostics.ProcessStartInfo pi = new ProcessStartInfo();
pi.UseShellExecute = true;
pi.WindowStyle = ProcessWindowStyle.Hidden;
pi.FileName= txtOutput.Text;
p.StartInfo = pi;
p.Start();
}

cn.Close();
cn.Close();
}

Jassim Rahma

Commandbars

suresh_sathya9-Jan-03 20:18

suresh_sathya

9-Jan-03 20:18

I have a small doubt.We can see the debug combobox & font combobox at the top of the dotnet IDE.I want to add my own textbox.I know it is possible to do via addin.But will it come under commandbar or anyother thing.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.