C# Discussion Boards - CodeProject

Re: How to get mouse selection

Christian Graus20-Oct-06 0:57

Christian Graus

20-Oct-06 0:57

There's a selected index property, I'd imagine that changes to -1 if you click on the box but not an item ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: How to get mouse selection

quiteSmart20-Oct-06 1:57

quiteSmart

20-Oct-06 1:57

hi christian

it is true that when u click in the box but not on an item the selected index will be -1 but whenever you click on an item and it is selected if you click another time in the box but not on an item the selected index will remain the index of that item.

Maybe u didn't understand my question: My problem is that whenever a user clicks inside the list box but not over an item; i want to un-select any selected item in the box (if any).

thanks

Jamil abou khalil

Re: How to get mouse selection

baerten20-Oct-06 1:00

baerten

20-Oct-06 1:00

Hi,

use the "SelectedIndexChanged" Event
But if the user clicks on the same item it won't work ( if i'm remembering good )

private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
{
// THE CODE
}

i hope it helps you

How to use Progressbar For File.Copy method ?

hdv21219-Oct-06 23:23

hdv212

19-Oct-06 23:23

hi i want to copy large file bye File.Copy method and show a progressbar for copying . how to do ??
thanks

Re: How to use Progressbar For File.Copy method ?

Bekjong19-Oct-06 23:48

Bekjong

19-Oct-06 23:48

File.Copy is a blocking function, so it doesn't report its progress. If you want to do so, I suggest you use 2 file streams to copy your file (use Stream, File.Open, Stream.BeginRead and Stream.BeginWrite).

Producing a mini dump after an application crash (C#)

raskar19-Oct-06 23:14

raskar

19-Oct-06 23:14

Hi there,
I am trying to include a procedure where my application can write some information to a filethat 'might' be a help for me to understand why the application crashed. In C and C++, miini dump was used, what can I use for C# projects? Also, is there any way I can obtain this file remotly?
Many thnx

raff

How to get size of uncompressed zipfile?

pacesino19-Oct-06 23:11

pacesino

19-Oct-06 23:11

Hi all,

I have zip file and i need to know size of files (inside) when i extract it.

How to get this size?

thx
-Mike

Load current datagrid row data into text field

Wargamon19-Oct-06 21:44

Wargamon

19-Oct-06 21:44

Hi, I have a few question here:

1. I have a Search function to search the datagrid. Thereafter, the pointer will select/highlight the current row. When I do another search, the same process happens but the previous row is still higlighted. How can I remove the previous higlighted row(s)?

dataGrid1.CurrentRowIndex = dRow;
dataGrid1.Select(dRow);

2. After I have search the correct Customer Code, I want to edit the details but not in the datagrid, editiing should be in textfield. How do I set the datagrid current row data to load into the textfield "Customer Code", "Customer Name" etc. The current textfields is bind to the Dataset when I used DataForm Wizard to create the form.

3. Is it possible to use buttons (e.g Previous Button < or Next Button >) to scroll the datagrid rows instead of the conventional (vertical scrolls)? When the button is press (Previous), the CurrentRowIndex become previous row (highlighted also) and the textfield details also change together.

Project Code

private void btnSearch_Click(object sender, System.EventArgs e)
{
try
{
DataRow dr;
DataTable tb = objCustomerDataset.Tables[0];
int dRow;
DataColumn[] DataCol = new DataColumn[1];
DataCol[0] = objCustomerDataset.Tables[0].Columns["Cust_Code"];
objCustomerDataset.Tables[0].PrimaryKey = DataCol;
tb.DefaultView.Sort = "Cust_Code";
int CountRow = 0;
CountRow = this.BindingContext[objCustomerDataset,"Customer Database"].Count;
MessageBox.Show("Number =" + CountRow);

if (tb.Rows.Contains(txtSearch.Text))
{
dr = tb.Rows.Find(txtSearch.Text);
dRow = objCustomerDataset.Tables[0].DefaultView.Find(txtSearch.Text);

BindingManagerBase BM;
BM = this.BindingContext[objCustomerDataset,"Customer Database"];

dataGrid1.CurrentCell = new DataGridCell(lrow, lcol);
lrow = dataGrid1.CurrentCell.RowNumber;
lcol = dataGrid1.CurrentCell.ColumnNumber;

if ((dr == null) | (dRow == -1))
{
string message = "Customer ID not found.";
string caption = "Search Customer ID";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBoxIcon icon = MessageBoxIcon.Warning;
DialogResult result;

result = MessageBox.Show(this, message, caption, buttons, icon);
}

else
{
dataGrid1.CurrentRowIndex = dRow;
dataGrid1.Select(dRow);

MessageBox.Show ("Current Position =" + BM.Position);

//Codes to invoke write Customer Code value to txtCustomerCode and display rest of details

}
}
else
{
string message = "Customer ID not found.";
string caption = "Search Customer ID";
MessageBoxButtons buttons = MessageBoxButtons.OK;
MessageBoxIcon icon = MessageBoxIcon.Warning;
DialogResult result;

result = MessageBox.Show(this, message, caption, buttons, icon);
}
}

catch (System.Exception eLoad)
{
// Add your error handling code here.
// Display error message, if any.
System.Windows.Forms.MessageBox.Show(eLoad.Message);
}
}
}

VS 2003
OLEDB C#: Windows Forms Application

How to generate a random number [modified]

CodeItWell19-Oct-06 21:23

CodeItWell

19-Oct-06 21:23

I don't know how to generate a random number.
Example: from 1-100.
Help.
Does it work on Visual Studio 2003.
Because I have Visual Studio 2003.

-- modified at 3:54 Friday 20th October, 2006

Vasildb

Re: How to generate a random number

seee sharp19-Oct-06 21:33

seee sharp

19-Oct-06 21:33

try using following

int randomNumber = random.Next(maxValue);

- ashish

Re: How to generate a random number

Guffa19-Oct-06 22:09

Guffa

19-Oct-06 22:09

Create a random object and use that to create random numbers.

Random rnd = new Random();
int value = rnd.Next(1, 101); // a number from 1 to 100

Yes, it works in framework 1.1, which is what is used with Visual Studio 2003.

---
b { font-weight: normal; }

How to get program start directory after using FileDialog

Ramith Sivanarain19-Oct-06 21:23

Ramith Sivanarain

19-Oct-06 21:23

Hi, I am new to C# and programming in Windows Forms.
I use DataSet.ReadXml and DataSet.WriteXml and Save and
OpenFileDialog to get the filename. I want to save and read some data from the path that the program starts.
In my previous programming language I could easily get the path of the exe file, however Directory.GetCurrentDirectory returns the path that I most recently used in the FileDialog. Is there a Function that returns the path at start of the process (program)
Thasnks

Ramith Sivanarain

Re: How to get program start directory after using FileDialog

jjansen19-Oct-06 21:28

jjansen

19-Oct-06 21:28

Ramith Sivanarain wrote:
Is there a Function that returns the path at start of the process (program)

Try Application.StartupPath

Processing global mouse and keyboard hooks in a secondary thread!

AngryC19-Oct-06 21:07

AngryC

19-Oct-06 21:07

Hello,

I've read the following article:

http://www.codeproject.com/csharp/globalhook.asp

The code is working very well except for the problem the author mentioned:

Question:
I have a long delay when closing applications using hooks by clicking the x button in the titlebar. If I close the application via another event (button click) for example, that works fine.

Answer:
It's a know bug of Microsoft. It has to do with the Windows themes. If you disable the Windows themes, the problem goes away. Another choice is to have the hook code run in a secondary thread.

Can anyone tell me how can I 'have the hook code run in a secondary thread'?

I would really appreciate your help. Thanks.

Using IR Port

Ravikumar Patra19-Oct-06 19:21

Ravikumar Patra

19-Oct-06 19:21

I need to send some command to an external device through IR PORT
I am using a USB to IR Device which will act as the IR Port
How to use this IR Port?

Please Help

Rabindra

Re: Using IR Port

Ashish Derhgawen19-Oct-06 23:23

Ashish Derhgawen

19-Oct-06 23:23

Check out this MSDN article. It shows how to implement a chat program using IrDA:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnhcvs04/html/vs04b6.asp[^]

- Ashish Smile | :)

Time flies like an arrow;
Fruit flies like a banana.

Ashish Derhgawen - http://ashishrd.blogspot.com

Re: Using IR Port [modified]

Ravikumar Patra29-Oct-06 17:42

Ravikumar Patra

29-Oct-06 17:42

Thanks for the reply.

Actually I want one way communication. ie I want to send commands to a dumb hardware which can only receive IR command and perform accordingly.

like a TV.

the hardware is a switcher.

here the connection is not established as the switcher can't reply back.

please help

the link you have provided is not working. It is showing the following

"Location Cannot Be Found

We apologize for the inconvenience, but the location you are seeking cannot be found. If you are looking for a particular document, please try one of the following areas:
...."

Rabindra

-- modified at 23:49 Sunday 29th October, 2006

Communication internet

nmhai8319-Oct-06 18:54

nmhai83

19-Oct-06 18:54

I want to receiver and send data with internet and network LAN using C#. But I don't know function and library. who can help me, please? as detail as posibly. thanks!

Re: Communication internet

seee sharp19-Oct-06 21:40

seee sharp

19-Oct-06 21:40

Hope following help you!!!

http://msdn2.microsoft.com/en-us/library/system.net.aspx[^]

http://msdn2.microsoft.com/en-us/library/system.net.httplistener.aspx[^]

- ashish

how do i convert string to type? help please!

abstar19-Oct-06 17:58

abstar

19-Oct-06 17:58

for example if i have a string like this:

string str = "System.Data.OleDb.OleDbParameter";

then i have object like this:

object obj;

the question how do i convert the type of obj to the value of str?

thanks so much

Re: how do i convert string to type? help please!

Captain See Sharp19-Oct-06 18:25

Captain See Sharp

19-Oct-06 18:25

Try the static method Type.GetType(string). It will return a Type object that you can manipulate using reflection. I don't know if there is an easy way to do what you want to do. I will research it.

█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██

Re: how do i convert string to type? help please!

abstar19-Oct-06 18:43

abstar

19-Oct-06 18:43

thanks

Re: how do i convert string to type? help please! [modified]

Captain See Sharp19-Oct-06 19:30

Captain See Sharp

19-Oct-06 19:30

Sorry, I thought this would work but it doesn't. I will leave it here in the hopes that it might spark an idea on how to do it.

string stype = "System.Int32";
Type t = Type.GetType(stype);

IConvertible converter = (IConvertible)t; //runtime error, Unable to cast object of type
//'System.RuntimeType' to type 'System.IConvertible'.

object obj = converter.ToType(typeof(int), CultureInfo.InvariantCulture);
//(or)
int i = (int)converter.ToType(typeof(int), CultureInfo.InvariantCulture);

InvariantCulture is a static property defined in the System.Globalization.CultureInfo class.

-- modified at 1:35 Friday 20th October, 2006

█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██

Re: how do i convert string to type? help please!

J4amieC19-Oct-06 21:59

J4amieC

19-Oct-06 21:59

You're half way there cap'n, you need to use Activator.CreateInstance on that Type object obtained using Type.GetType

---

How to get answers to your questions[^]

Re: how do i convert string to type? help please!

Captain See Sharp20-Oct-06 13:49

Captain See Sharp

20-Oct-06 13:49

Thanks! I knew that, I just couldn't remember Smile | :)

█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██

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