combobox type mismatch - C# Discussion Boards

replacing new lines and tab spacing with a single space

mist_psycho20-Apr-09 4:08

20-Apr-09 4:08

I am passing a text file using streamreader and filestream.......My moto is to replace the new lines and tab spacing with a single space....But instead the resulting text file is empty once my project is execute.........
plz help !!!

using System.IO;
.
.
.
.
.
string path="C://test.txt";
Streamreader re=File.Openext(path);
StreamWriter rw=new StreamWriter(path);

while((input=re.ReadAllLines())!=null)
{
if(input=="\n")
rw.Write(" ");
if(input=="\t")
rw.Write(" ");
}

.......whr am i goin wrong ???

Re: replacing new lines and tab spacing with a single space [modified]

agent00zelda20-Apr-09 4:43

agent00zelda

20-Apr-09 4:43

One suggestion would be to check out the members of the StreamReader and StreamWriter classes, along with sample code. Try using Read() or ReadLine() instead of the ReadAllLines() in your while loop condition.

http://msdn.microsoft.com/en-us/library/system.io.streamreader.aspx[^]

http://msdn.microsoft.com/en-us/library/system.io.streamwriter.aspx[^]

Also, you might want to consider copying the data as you read it to a new text file and overwriting the old one when you are finished. And don't forget to close the filestreams when complete.

modified on Monday, April 20, 2009 10:49 AM

Re: replacing new lines and tab spacing with a single space

riced20-Apr-09 4:51

riced

20-Apr-09 4:51

1 You should output to a new file not the one you are reading in.
For example use:

string path="C://test.txt";
Streamreader re=File.Openext(path);
StreamWriter rw=new StreamWriter(@"C:\test_out.txt"));

2 Your loop is wrong. Look at what ReadAllLines() does in help.
You probably want something like:

string input;
StringBuilder sb = new StringBuilder("");
while((input=re.ReadLine())!=null)
{
   input = input.Replace('\t', ' '); //replace tabs
   sb.Append(input + " ");
}
rw.Write(sb.ToString());

The StringBuilder is used because ReadLine() drops the new lines (so you don't need to replace them) and you need to add the space after the line.

3 Have a look at File.ReadAllText() and Replace() for strings. It might be simpler to use these.

Regards
David R

Re: replacing new lines and tab spacing with a single space

mist_psycho20-Apr-09 6:12

mist_psycho

20-Apr-09 6:12

my input in the text file is somethin like :
hi
this
is
mist

I need the output as : hi this is mist ......

i tried using ur tips for removing the new lines and replace them with a single space but could'nt do....and how can i get the output in d same text file only ??

need help..... !!..plz

Re: replacing new lines and tab spacing with a single space

OriginalGriff20-Apr-09 6:32

OriginalGriff

20-Apr-09 6:32

StringBuilder sb = new StringBuilder();
string line;
using (StreamReader sr = new StreamReader(fileName))
    {
    while ((line = sr.ReadLine()) != null)
        {
        sb.Append(line + " ");
        }
    }
line = sb.ToString();
// Do what you need with the output data.

Now, read a manual, and do your own homework next time!

Re: replacing new lines and tab spacing with a single space

riced20-Apr-09 7:16

riced

20-Apr-09 7:16

The code I and OriginalGriff gave should work.
Unless you show us some code and tell us what it produces we can only guess at how to help you. Smile | :)

Regards
David R

Re: replacing new lines and tab spacing with a single space

PIEBALDconsult20-Apr-09 14:04

PIEBALDconsult

20-Apr-09 14:04

Do you want multiple whitespace characters changed to one SPACE? Or each whitespace character changed to a SPACE?

combobox type mismatch

fecaloid monster20-Apr-09 3:51

fecaloid monster

20-Apr-09 3:51

Here is my combobox which gets values from database:

da2.TableMappings.Add("Table", "SubjectTitle");
da2.Fill(ds2);
this.dviewmanager = ds2.DefaultViewManager;
this.comboBox1.DataSource = this.dviewmanager;
this.comboBox1.DisplayMember = "SubjectTitle.Title";
this.comboBox1.ValueMember = "SubjectTitle.ID";

When I want to insert some data to database with value from combobox everything is perfect.

string insertQuery = "INSERT INTO Lection (ID_Subject, title, body) values ('" + comboBox1.SelectedValue + "','" + textBox3.Text + "','" + textBox4.Text + "')";
OleDbCommand cmd = new OleDbCommand();
cmd.CommandText = insertQuery;
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();

But when I want to select data with combobox in query I get Type mismatch error

leccom = new OleDbCommand("SELECT * FROM Lection WHERE ID_Subject ='" + comboBox1.SelectedValue + "'", leccon);
lecadapter = new OleDbDataAdapter();
lecadapter.SelectCommand = leccom;
lectable = new DataTable();
lecadapter.Fill(lectable);
textBox3.DataBindings.Add("Text", lectable, "Title");
textBox4.DataBindings.Add("Text", lectable, "Body");
lecmanager = (CurrencyManager)this.BindingContext[lectable];

ID_Subject field in database is numeric. I tried to convert combobox to an integer, but it didn't work or maybe I did it wrong. Why is this SELECT query doesn't work? Thanks in advance for any help!

Re: combobox type mismatch

N a v a n e e t h20-Apr-09 4:19

N a v a n e e t h

20-Apr-09 4:19

fecaloid monster wrote:
Why is this SELECT query doesn't work?

What is the error you are getting? If ID_Subject is a numeric field, you don't have to put the value in single quotes (''). Does that solves the problem?

Your code is open to SQL Injection attacks and you need to do some reading on that.

Smile | :)

Navaneeth

How to use google | Ask smart questions

Re: combobox type mismatch

fecaloid monster20-Apr-09 5:10

fecaloid monster

20-Apr-09 5:10

Oh, thank you so much, it works! And thanks for remark, i will consider that fault.

Data Modeler

Muhammad Nauman Yousuf20-Apr-09 3:31

Muhammad Nauman Yousuf

20-Apr-09 3:31

Dear All,

I have an SQL Server database, looking for the best data modeling tool that can develop a detailed report of my database

Any idea ?!

Regards,
Muhammad Nauman

"Mess with the Best, Die like the rest"

Re: Data Modeler

Nagy Vilmos20-Apr-09 3:42

Nagy Vilmos

20-Apr-09 3:42

M. Nauman Yousuf wrote:
Any idea ?!

Try a different forum?[^]

Panic, Chaos, Destruction.
My work here is done.

System.Mangement.ManagementObject is not working properly in a WinForms application.

darthBug20-Apr-09 3:25

darthBug

20-Apr-09 3:25

Hi all,

I have a WinForm application that should display the Startup Mode of a service.
I'm using ManagementObject to access it, like that:

ManagementObject mgmtObject = new ManagementObject("Win32_Service.Name='Dhcp'");
mgmtObject.Get();

If I access any of the values of mgmtObject in the debugger it says: "Function evaluation timed out".
The same code works perfectly in a console application.

I've googled for long but couldn't find anything that explains this.

Thanks,

darthBug

Join the dark side of the code

Re: System.Mangement.ManagementObject is not working properly in a WinForms application.

DaveyM6920-Apr-09 3:34

DaveyM69

20-Apr-09 3:34

Not sure what the problem is. This works fine for me in WinForms

ManagementObject mgmtObject = new ManagementObject("Win32_Service.Name='Dhcp'");
MessageBox.Show(mgmtObject.Properties["StartMode"].Value.ToString());

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: System.Mangement.ManagementObject is not working properly in a WinForms application.

darthBug20-Apr-09 4:04

darthBug

20-Apr-09 4:04

It's probably not the WinForm's fault but I can't figure out why it fails.

Is there a way took analyze this problem and find the source or the error?

darthBug

Join the dark side of the code

Re: System.Mangement.ManagementObject is not working properly in a WinForms application.

DaveyM6920-Apr-09 6:05

DaveyM69

20-Apr-09 6:05

The normal debugging/breakpoints/stacktrace etc.

If you can't get to the bottom of it, post a little more code and I'm sure one of us can help.

Re: System.Mangement.ManagementObject is not working properly in a WinForms application.

darthBug21-Apr-09 3:30

darthBug

21-Apr-09 3:30

Hi,

Thanks for the reply.

The wierd thing is it seems to be working during run time but inside the debbuger I get the error.
When I was debugging it I got the error and thought it wasn't working at all, didn't really bother to let it go all the way.

Thanks,

darthBug

Join the dark side of the code

Online help code

Member 437447420-Apr-09 3:20

Member 4374474

20-Apr-09 3:20

Hi,I need you to help me with the c# code for help function.Me and my project team members are going to develop system for security soon Confused | :confused:

Re: Online help code

SeMartens20-Apr-09 3:29

SeMartens

20-Apr-09 3:29

Well, and the question is?

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

Re: Online help code

King Julien20-Apr-09 3:30

King Julien

20-Apr-09 3:30

Member 4374474 wrote:
I need you to help me with the c# code for help function.

Member 4374474 wrote:
Me and my project team members are going to develop system for security

What security???

Please be specific about your question which can be yield more suggestions.....

Have a Happy Coding.....

Re: Online help code

Nagy Vilmos20-Apr-09 3:43

Nagy Vilmos

20-Apr-09 3:43

Shan't and won't!

Mad | :mad:

Panic, Chaos, Destruction.
My work here is done.

Re: Online help code

Mycroft Holmes20-Apr-09 14:40

Mycroft Holmes

20-Apr-09 14:40

Scary thing is you have a team and you think you can develop something. I hope like hell you don't have a paying client.

Never underestimate the power of human stupidity
RAH

KEYBOARD DRIVER IN C#

svt gdwl20-Apr-09 2:21

svt gdwl

20-Apr-09 2:21

Hi,
I want to implement the keyboard driver in c#?
How can I start it?
can I do this with the help of BHO?

Re: KEYBOARD DRIVER IN C#

Vikram A Punathambekar20-Apr-09 2:59

Vikram A Punathambekar

20-Apr-09 2:59

1. Don't use ALL CAPS.
2. Why do you want to use C#, of all things, for a driver? WTF | :WTF:

3. Please be more specific with your questions.

Cheers,
Vıkram.

Carpe Diem.

Re: KEYBOARD DRIVER IN C#

svt gdwl20-Apr-09 3:20

svt gdwl

20-Apr-09 3:20

I had already had a BHO in c# which is generated through
http://www.codeproject.com/KB/cs/Attach_BHO_with_C_.aspx?fid=447248&df=90&mpp=25&noise=3&sort=Position&view=Quick&fr=51&select=2421069

I had character mapping done in c# using delegates. The main thing is I want to get the position or tag element attributes ( name or id of that tag element) where cursor position is set on browser window. How can I get this?

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