C# Discussion Boards - CodeProject

Re: Need help in C#.NET 2005 beta 2

tom_dx28-Jun-05 6:24

tom_dx

28-Jun-05 6:24

i renamed the whole class to mainform.. using refactor of course

IM PROUD TO BE A GMAIL;

Re: Need help in C#.NET 2005 beta 2

tom_dx28-Jun-05 6:40

tom_dx

28-Jun-05 6:40

That was it, sry I'm new to .net and C#, in c++ you didn't have to do this :P, that was it thank you.

IM PROUD TO BE A GMAIL;

Manipulating TreeView Nodes and C#

crazy_girl27-Jun-05 13:13

crazy_girl

27-Jun-05 13:13

Does anyone know how to manipulate treeview nodes such as copy, cut, & paste features? Any suggestions is greatly appreciated. thanx

Re: Manipulating TreeView Nodes and C#

S. Senthil Kumar27-Jun-05 16:31

S. Senthil Kumar

27-Jun-05 16:31

AFAIK, there are no direct ways to do them. You can always simulate them by moving/adding the nodes. Like

TreeNode tempNode;

void CutNode(TreeNode selectedNode)
{
   tempNode = selectedNode;
   tempNode.Parent.Nodes.Remove(tempNode);
}
void PasteNode(TreeNode parentNode)
{
   parentNode.Nodes.Add(tempNode);
}

void CopyNode(TreeNode selectedNode)
{
   tempNode = selectedNode;
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Manipulating TreeView Nodes and C#

crazy_girl29-Jun-05 6:40

crazy_girl

29-Jun-05 6:40

thanx for the tips. It works except for copyNode. You can't simple assign the selectedNode to tempNode because this doesn't actually make a copy of the selectedNode. Instead:

void copyNode(treeNode selectedNode)
{
tempNode = selectedNode.clone();
}

Using Passport .NET for SSI

dgap27-Jun-05 13:07

dgap

27-Jun-05 13:07

I am having some problems implementing Microsoft's Passport for sign in.

I am in a pre-production environment and I'm able to successfully sign in using a PREP e-mail but when I query the passport manager object using the IsAuthenticated function it says false

anyone know why this may be happening?

I need to get the authenticated user's PUID and can't unless they are authenticated

Any help would be greatly appreciated

schoudhr@hotmail.com

graphics.Clear(color) - Incorrect color!

redact20727-Jun-05 9:26

redact207

27-Jun-05 9:26

I have the following code, however it paints a different color :S

Color blueColor = Color.FromArgb(41, 22, 111);
g.clear(blueColor);

It displays Ok on a display with a 32bit color depth, however when I change it to 16bit, it appears lighter than it should. I'm guessing this is because of the unused alpha value, or maybe it's doing something strange with the gamma - beats me?

Does anyone know how to fix this so it displays the correct value on a 16bit display??

Thanks!

Re: graphics.Clear(color) - Incorrect color!

Daniel Monzert27-Jun-05 10:01

Daniel Monzert

27-Jun-05 10:01

It doesn't sound strange to me, since RGB is a 24 bit value, even if computers like powers of 2. If no color table is used, then the 24 bit value needs to be encoded as a 16 bit color which is 5 bits for each color (red, green blue), 1 bit unused.

I may be not completely right with that.

E.g. a 16 bit color can be converted to a 32 bit value with:

Color32 = ( (((Color16 >> 10) & 0x1F) * 0xFF / 0x1F) |<br />
((((Color16 >> 5) & 0x1F) * 0xFF / 0x1F) << 8) |<br />
((( Color16 & 0x1F) * 0xFF / 0x1F) << 16));

Looks weird. A 16 bit color may look like tihs.

<br />
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 <- Bits<br />
U R R R R R G G G G G B B B B B <- Color<br />
U = Unused<br />
R = Red<br />
...<br />

Re: graphics.Clear(color) - Incorrect color!

redact20727-Jun-05 10:20

redact207

27-Jun-05 10:20

thanks for the explaination - i kinda get what you mean. One thing i don't understand, however, is the color16 and how to get the final value into a "Color" obj??

cheers!

Re: graphics.Clear(color) - Incorrect color!

Dan Neely27-Jun-05 10:47

Dan Neely

27-Jun-05 10:47

IIRC rather than wasting a bit the green channel has 6 bits instead of 5 like the red/blue. I've no idea what makes green special.

Re: graphics.Clear(color) - Incorrect color!

Roger Alsing28-Jun-05 2:30

Roger Alsing

28-Jun-05 2:30

yepp you are correct about the extra green bit..

because the human eye is more sensitive to see variations of green (i guess since our tree climbing/plains crawling days)

//Roger

Re: graphics.Clear(color) - Incorrect color!

Anthony Baraff28-Jun-05 2:32

Anthony Baraff

28-Jun-05 2:32

The human eye is more sensitive to differences in green.

RichTextBox, manipulating RTF directly

Daniel Monzert27-Jun-05 7:31

Daniel Monzert

27-Jun-05 7:31

Hi there.

In order to create a class for a chat application - like readonly textbox that inherits the System.Windows.Forms.RichTextBox, I am trying to use a predefined color table (IRC-like textbox) in the RTF code.

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 Fixedsys;}}<br />
{\colortbl ;\red0\green0\blue0;\red255\green255\blue255;\red0\green0\blue139;\red0\green100\blue0;\red255\green0\blue0;\red128\green0\blue0;\red128\green0\blue128;\red255\green165\blue0;\red255\green255\blue0;\red144\green238\blue144;\red95\green158\blue160;\red0\green255\blue255;\red0\green0\blue255;\red255\green192\blue203;\red169\green169\blue169;}<br />
"\viewkind4\uc\pard\f1\highlight1\cf2 This line uses the first color as foreground- and the second color as background-color on this line\par<br />
\highlight0\cf0 This line uses default colors.}

After I set the new RichText (control.RTF = variable), the RichTextBox automatically reformats the raw rich text I manipulated just a few ticks ago. It removes all not yet used colors from the colortable and even reorders it.

Is there a way to override/avoid automatic reformatting of the raw richtext (control.RTF)? I don't want to use the techinque where the last added text is selected, some forecolor applied, via API some background color applied, ...

Daniel

User Control MouseEnter MouseLeave Problems

notacake27-Jun-05 6:36

notacake

27-Jun-05 6:36

I've got a UserControl that responds to the MouseEnter and MouseLeave problems, making a highlight effect as the mouse passes over, however the controls within my control fire the MouseLeave event when the mouse moves from my control into the child control. Is there any way to make these controls "invisible" to mouse events?

Thanks in advance,
Peter

Re: User Control MouseEnter MouseLeave Problems

david cohoon27-Jun-05 7:38

david cohoon

27-Jun-05 7:38

You could override the WndProc() method of the control to ignore the message.

Re: User Control MouseEnter MouseLeave Problems

notacake27-Jun-05 8:26

notacake

27-Jun-05 8:26

Hmmm, how would that work? I don't want to completely ignore the MouseLeave event of the control, I just want to ignore the MouseEnter event of the child controls, wouldn't the MouseLeave event of the user control still get fired?

Datasets & RowStates

farhan197627-Jun-05 5:26

farhan1976

27-Jun-05 5:26

Hi guyz,

I got a quick question regarding DataSets and RowState. In the

following code sample I populate a DataSet, then modifies two rows,

and call the DataRow.AcceptChanges(). But when i retrieve the

Rowstate of those edit Rows it says "UNCHANGED".

shouldn't be "MODIFIED". If not, then WHY?????

here is the code :

namespace DSEditEx
{
///

/// Summary description for dsClass.
///

public class dsClass
{
//private variable which represents a DataSet <ds>
private DataSet ds;

public dsClass()
{
//instantiate the <ds>
ds = new DataSet();

try
{
//Initialize ds
ds = new DataSet();

//define the first data table
DataTable tblCustomer = new

DataTable();

//define and add columns to ds
DataColumn custID = new

DataColumn();
custID.ColumnName = "CustomerID";
custID.ColumnName = "Customer ID";
custID.AllowDBNull = false;
custID.DataType =

System.Type.GetType("System.Int16");
tblCustomer.Columns.Add(custID);

DataColumn fn = new DataColumn();
fn.ColumnName = "FirstName";
fn.Caption = "First Name";
fn.AllowDBNull = false;
fn.DataType =

System.Type.GetType("System.String");
tblCustomer.Columns.Add(fn);

DataColumn ln = new DataColumn();
ln.ColumnName = "LastName";
ln.Caption = "Last Name";
ln.AllowDBNull = false;
ln.DataType =

System.Type.GetType("System.String");
tblCustomer.Columns.Add(ln);

//adding the table -> ds
ds.Tables.Add(tblCustomer);

//load some data into datatable 1

-> tblCustomers
DataRow r;
for(int i=0; i < 10; i++)
{
r = ds.Tables[0].NewRow();
r[0] = i;
r[1] = "Farhan_" + i;
r[2] = "Munir_" + i;
tblCustomer.Rows.Add(r);
}
}
catch(Exception ex) {

Console.WriteLine(ex.ToString()); }
}

//public method which illustrates how to edit

values
//in the datarow. How to check the state of the

DataRow
public void DemoDSEdit()
{
try
{
//we are going to modify Row[0]
DataRow editRow =

ds.Tables[0].Rows[0];

//we are going to modify the first

and last name
editRow[1] = "John";
editRow[2] = "Doe";

//Now check the state of all Rows
//Note we haven't commit any

changes yet
Console.WriteLine("Checking the Row

State");
for(int i=0; i <

ds.Tables[0].Rows.Count; i++)
Console.WriteLine("State of

Row[" + i + "] : " + ds.Tables[0].Rows[i].RowState.ToString());

//Now Commit changes and again

check the State of Row
Console.WriteLine("\nCommitting

Changes and Checking the RowState");
editRow.AcceptChanges();
for(int i=0; i <

ds.Tables[0].Rows.Count; i++)
Console.WriteLine("State of

Row[" + i + "] : " + ds.Tables[0].Rows[i].RowState.ToString());

//Modify the Row[0] again
editRow = null;
editRow = ds.Tables[0].Rows[1];
editRow[1] = "Jane";
editRow[2] = "Munir";
Console.WriteLine("\nCommitting

Changes and Checking the RowState");
editRow.AcceptChanges();
for(int i=0; i <

ds.Tables[0].Rows.Count; i++)
Console.WriteLine("State of

Row[" + i + "] : " + ds.Tables[0].Rows[i].RowState.ToString());
}
catch(Exception ex) {

Console.WriteLine(ex.ToString()); }
}
}
}

----------------------------------------
OUTPUT is :
----------------------------------------
Checking the Row State
State of Row[0] : Added
State of Row[1] : Added
State of Row[2] : Added
State of Row[3] : Added
State of Row[4] : Added
State of Row[5] : Added
State of Row[6] : Added
State of Row[7] : Added
State of Row[8] : Added
State of Row[9] : Added

Committing Changes and Checking the RowState
State of Row[0] : Unchanged
State of Row[1] : Added
State of Row[2] : Added
State of Row[3] : Added
State of Row[4] : Added
State of Row[5] : Added
State of Row[6] : Added
State of Row[7] : Added
State of Row[8] : Added
State of Row[9] : Added

Committing Changes and Checking the RowState
State of Row[0] : Unchanged
State of Row[1] : Unchanged
State of Row[2] : Added
State of Row[3] : Added
State of Row[4] : Added
State of Row[5] : Added
State of Row[6] : Added
State of Row[7] : Added
State of Row[8] : Added
State of Row[9] : Added

Re: Datasets & RowStates

david cohoon27-Jun-05 7:41

david cohoon

27-Jun-05 7:41

If you want the rows to remain as MODIFIED, do not call AcceptChanges(). By calling AcceptChanges() you are commanding the data row(s) to end the current edit.

Re: Datasets & RowStates

Luis Alonso Ramos27-Jun-05 9:30

Luis Alonso Ramos

27-Jun-05 9:30

The idea is that you perform the editions on the rows (add, delete, modify) and then, somewhere else, you check which rows have been modified and save only those to the database. You then call AcceptChanges. Then, after the next set of changes, only the newly-changed rows will require saving to the real database.

If you use a data adapter, it automatically calls AcceptChanges in Update after updating the database.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

shared folders

amarsumanth27-Jun-05 4:54

amarsumanth

27-Jun-05 4:54

I m having a problem, where i need to display shared folders of a computer in C#. Like i enter a computer name and it has to display shared folders in windows explorer. i don't know how to do it? can anybody guide?

Amar

Re: shared folders

Judah Gabriel Himango27-Jun-05 8:57

Judah Gabriel Himango

27-Jun-05 8:57

You'll need to utilize the Windows Shell APIs. This site has several articles on how this is done, search for 'shell' C# articles and you should get a few hits.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Conversation With a Muslim
Judah Himango

Are you good with Maths API

hasanali0027-Jun-05 4:05

hasanali00

27-Jun-05 4:05

I wonder if u can help me in solving the following problem:

I want to divide a number by 10 and get the result as the highest number.

Let me explain with following examples:
13/10 = 2 and
27/10 = 3

How can I achieve this
thanks

Re: Are you good with Maths API

DavidNohejl27-Jun-05 4:13

DavidNohejl

27-Jun-05 4:13

Math.Round( (a / 10) + .5 ) ?

David

Re: Are you good with Maths API

mav.northwind27-Jun-05 4:19

mav.northwind

27-Jun-05 4:19

How about (int)((n+9)/10) ?
You can even skip the (int) if your n already is an int...

mav

Re: Are you good with Maths API

Roger Wright27-Jun-05 4:28

Roger Wright

27-Jun-05 4:28

Not knowing C# I can't give you the proper code, but in pseudo-code:

If (x - int(x)) > 0.00
return int(x) + 1
else
return int(x)

Unlike the rounding function, which will round down as well as up, this will return either the original input, if it is an integer, or the next higher integer if it contains any fractional part at all. You may still get some goofy errors, though, because the input might have some small fractional part due to previous calculations. There are ways to get around that, but they may not be necessary depending upon your application.

"...putting all your eggs in one basket along with your bowling ball and gym clothes only gets you scrambled eggs and an extra laundry day... " - Jeffry J. Brickley

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