Threading problem - C# Discussion Boards

panoskatws4-Apr-08 3:25

4-Apr-08 3:25

Hello!!
I have managed to load an rtf file in a streamreader :
"StreamReader sr = new StreamReader("C:\\test.rtf");"
and display it in a richtextbox:
"richTextBox1.Rtf = sr.ReadLine();"
Is there any way that I could posibly "read" each ,lets say, 10 lines? I suppose I could detect where this "\par" appears in the stream but don't know how to do it...
Any suggestions??? Does the readline method have any operation for this?
Thanks!!

Re: rtf and streams

Rick van Woudenberg4-Apr-08 3:34

Rick van Woudenberg

4-Apr-08 3:34

Hey,

I guess there are several ways of doing this. One way is :

//Load your text file<br />
            TextReader tr = new StreamReader("\\test.txt");<br />
<br />
            //How many lines should be loaded?<br />
            int NumberOfLines = 10;<br />
<br />
            //Make our array for each line<br />
            string[] ListLines = new string[NumberOfLines];<br />
<br />
            //Read the number of lines and put them in the array<br />
            for (int i = 1; i = NumberOfLines; i++)<br />
            {<br />
                ListLines[i] = tr.ReadLine();<br />
            }<br />
<br />
            //This will write the 5th line into the console<br />
            Console.WriteLine(ListLines[5]);<br />
            //This will write the 1st line into the console<br />
            Console.WriteLine(ListLines[1]);<br />
<br />
            Console.ReadLine();<br />
<br />
            // close the stream<br />
            tr.Close();

Another way of doing it , could be :

int counter = 0;<br />
string line;<br />
<br />
// Read the file and display it line by line.<br />
System.IO.StreamReader file = <br />
   new System.IO.StreamReader("c:\\test.txt");<br />
while((line = file.ReadLine()) != null && counter < 10)<br />
{<br />
   Console.WriteLine (line);<br />
   counter++;<br />
}<br />
<br />
file.Close();<br />
<br />
// Suspend the screen.<br />
Console.ReadLine();

You will have to play with it a little bit to get it right, but is not that hard.

Hope this helps Big Grin | :-D

Re: rtf and streams

panoskatws4-Apr-08 4:20

panoskatws

4-Apr-08 4:20

Thank you Rick but I still have a problem. I tryied out the second way you suggested, and it seems like it is counting the exact lines of the text file and not where "\par" is...I hope you understand what I'm trying to say...
So I believe that I have to check where "\par" is in the stream and then increase the counter. Any suggestions??

Re: rtf and streams

Rick van Woudenberg4-Apr-08 4:53

Rick van Woudenberg

4-Apr-08 4:53

No problem .. Big Grin | :-D

Could you try to explain to me what "\Par" is .. is it a line break, or a text value that it is suppose to detect ?

Re: rtf and streams

panoskatws5-Apr-08 4:54

panoskatws

5-Apr-08 4:54

Hey rick, I don't want to cause any trouble to you... Anyway, "\par" is a linebreak like "
" in html. Rich Text Format uses the backslash to start it's control code instead of tags<>. So I have to detect where "\par" is in the document. I believe that this is the only way to read a formated document line by line. I hope you understand... Any ideas if it's no trouble???
Thanks!!!!

Re: rtf and streams

mav.northwind4-Apr-08 23:24

mav.northwind

4-Apr-08 23:24

Hi!
There's nothing like this available out-of-the-box. StreamReader.ReadLine() reads until the next occurrance of \n, \r or \r\n, nothing to do about it.
In an RTF document, these line break characters are more or less treated as white spaces, so there's no point in trying to use ReadLine() on an RTF file.

You'd have to write your own method to read until \par, but even then the RTF data will not be well-formed (for example, some closing braces will be missing) and I cannot say what a RichTextBox does with partially invalid data...

Regards,
mav

--
Black holes are the places where God divided by 0...

Re: rtf and streams

panoskatws5-Apr-08 5:16

panoskatws

5-Apr-08 5:16

Hey, thanks for the reply! I thought that readline isn't suitable and that I have to create a method for this. But don't know how... The method should be able to read from a stream in whitch the formated text of the rtf file is loaded and detect \par. For the problems you mentioned I believe I have to live with them... Could you help me out here??

Threading problem

Rick van Woudenberg4-Apr-08 2:53

Rick van Woudenberg

4-Apr-08 2:53

Dear all,

I've written a method which I call from a thread. The problem is that it opens the form in the method, as it is suppose to, but it closes the form immediately after it opened it. Any hints ?

here's the code :

        void ultraGrid1_ClickCellButton(object sender, CellEventArgs e)<br />
        {<br />
                Thread thread = new Thread(OpenMethod);<br />
                thread.Name = "something";<br />
                thread.Start();<br />
                //thread.Join();<br />
        }<br />
<br />
        private void OpenMethod()<br />
        {<br />
          if (_form == null)<br />
            {<br />
                _form = new NewForm();<br />
                _form.Closed += new EventHandler(_form_Closed);<br />
            }<br />
            _form.WindowState = FormWindowState.Normal; // bring it from the taskbar if necessary<br />
            _form.Show();<br />
        }

Kind regards,

Re: Threading problem

leppie4-Apr-08 3:42

leppie

4-Apr-08 3:42

You calling a UI method on a non-UI thread, look at the Output console. An exception should be waiting for you.

xacc.ide - now with IronScheme support
IronScheme - 1.0 alpha 2 out now

Re: Threading problem

SeeBees4-Apr-08 16:15

SeeBees

4-Apr-08 16:15

Is it such that everything related to UI-rendering should be done in UI thread?

Re: Threading problem

S. Senthil Kumar5-Apr-08 13:56

S. Senthil Kumar

5-Apr-08 13:56

Calling Show requires that the thread be running a message pump (like Application.Run). Replace _form.Show with _form.ShowDialog and it should work fine - ShowDialog is modal and runs its own message pump.

Regards
Senthil [MVP - Visual C#]
_____________________________
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is there a way to restrict possible values of a string param in a method

Adam Harbour4-Apr-08 2:40

Adam Harbour

4-Apr-08 2:40

Hi I have a c# method that takes as one of its params. I would like to restrict the possible values. I realize that enums would achieve this but I cannot create enums with a string value only integer values

eg

public string ProcessTrade(string value1, string values2)
{
...method only allows value 1 to be A, B or C
and should not use code in the method to do this,
the compiler should catch it
}

calling
string result = ProcessTrade("E","ABC") should complie ok, but
string result = ProcessTrade("EEE","ABC") should not complie

Ideally an emun would achieve this if string enums worked

eg

//this wont work because enums have to have an in value
//but this is what i would like

enum TradeType
{
Equity = "E",
MuniBond = "M",
Treasury = "T",
Agency = "A"
}

If an enum like this existed I could then create the method

public string ProcessTrade(TradeType CurrentTradeType, string values2)
{
Switch(CurrentTradeType)
Case CurrentTradeType.Equity:
….etc etc
}

And it would be called in a tidy fashion thus:

String Result = ProcessTrade(TradeType.Equity,”ABC”)

Re: is there a way to restrict possible values of a string param in a method

Pete O'Hanlon4-Apr-08 2:50

Pete O'Hanlon

4-Apr-08 2:50

There are many ways to do this with an enum, but you may want to take a look at the Description attribute. This[^] is a great article - chock full of yummy enummy goodness.

Deja View - the feeling that you've seen this post before.

My blog | My articles

Wrong data returned!

Graham_44-Apr-08 1:24

Graham_4

4-Apr-08 1:24

I am using a Data class to return data from SQL server

<br />
 DataSet tpoDataSet = new DataSet();<br />
 command.Transaction = transaction;<br />
 command.CommandText = psSqlStatement;<br />
 command.Connection = ipoConnection;<br />
 adapter = dbProvider.CreateDataAdapter();<br />
 adapter.SelectCommand = command;<br />
 adapter.Fill(tpoDataSet);<br />
            <br />
return tpoDataSet;<br />

Its in a dll which is used across different projects for linking to SQL and has
proven its reliability in the past.
However I am passing a sql string to return information on a table in a database

<br />
"SELECT column_name as colname ,data_type as datatype, " + <br />
"character_maximum_length as CharLen,numeric_precision, " +<br />
"numeric_scale, column_default as defaultvalue , " + <br />
"CASE WHEN COLUMNPROPERTY(object_id(table_name),column_name,'IsIdentity') =1 THEN " +<br />
"'YES' ELSE 'NO' END " +<br />
"as 'IsIdentity', " +<br />
"is_nullable as IsNullable " +<br />
"FROM [" + psTargetDb + "].INFORMATION_SCHEMA.COLUMNS " +<br />
"WHERE TABLE_SCHEMA = 'dbo' " +<br />
"AND table_name <> 'utSqlLog' " +<br />
"AND table_name = '" + tpsTableName + "'";<br />

the problem is with the line

<br />
"CASE WHEN COLUMNPROPERTY(object_id(table_name),column_name,'IsIdentity') =1 THEN " +<br />
"'YES' ELSE 'NO' END "<br />

which is returning 'NO' even if the field is an identity field. If I cut and
paste the query into sql and run it then I get the field values that I would expect! Confused | :confused:

Help appreciated.

Plugins for MS Office, Internet explorer using C#

Vikas K.4-Apr-08 0:53

Vikas K.

4-Apr-08 0:53

Hi,

Please let me know if there are any good books to start with plugins for MS office, Outlook, IE etc using C#? I loking into few links on MSDN but wanted to see if anyone has some pointers on it?

Appreciated
Thanks
Vikas

Re: Plugins for MS Office, Internet explorer using C#

John_Adams4-Apr-08 1:06

John_Adams

4-Apr-08 1:06

Hi Vikas,

If you are looking to Office addins in .Net (i.e., VS2005) then look for VSTO (Visual Studio Tools for Office). Below are few links which will help you in understanding the concept of VSTO
http://msdn2.microsoft.com/en-us/office/aa905543.aspx[
target="_blank" title="New Window">^]
http://msdn2.microsoft.com/hi-in/magazine/cc163403(en-us).aspx[^]

http://www.wrox.com/WileyCDA/WroxTitle/productCd-0471788139.html[^]

Hope this helps Smile | :)

Regards,
John Adams
ComponentOne LLC

Re: Plugins for MS Office, Internet explorer using C#

Vikas K.4-Apr-08 1:24

Vikas K.

4-Apr-08 1:24

I tried to install VSTO but I have C# 2005 express edition and doesnt support.

Is there anyway I can try VSTO on Express edition?

Thanks
Vikas

Re: Plugins for MS Office, Internet explorer using C#

Member 38312474-Apr-08 3:27

Member 3831247

4-Apr-08 3:27

most of the pluging application uses COM as underlying technology , C# make it quite easy to use the plugin in any other applicaiton , there are lot of book avaliable on pluging but most of them uses sample code in C++ or VB, you get the concept from there and can implement the same using C# sementic which are quite simple as compared to COM in C++

Regards,
Sunil Tonger

How to get Keypress event to menuStrip

ASysSolvers3-Apr-08 23:48

ASysSolvers

3-Apr-08 23:48

In my prohect I have menustrip with sub items.but I have used KeyBoard Hooks in prohect and j't allow Up n Down arrow.I want to collopse menu bar and iterate by arrow.(no mouse even).
If U have any suggestion please help me.
Thanks in advance!

BLOB reading and writing C#

Dev Motiramani3-Apr-08 23:25

Dev Motiramani

3-Apr-08 23:25

Hello friends ,

I am facing problem dealing with blob data using C#. can anybody tell me how to read and write data in blob field .

thankin you ...

Re: BLOB reading and writing C#

Giorgi Dalakishvili3-Apr-08 23:32

Giorgi Dalakishvili

3-Apr-08 23:32

Here you go: How To Read and Write BLOB Data by Using ADO.NET with Visual C# .NET[^]

Giorgi Dalakishvili

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my articles
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Re: BLOB reading and writing C#

Dev Motiramani4-Apr-08 0:06

Dev Motiramani

4-Apr-08 0:06

hi there,

I am trying to read and write .xls file into the database table.
It writes the file successfully and reads as well .. but when I try
to open it after reading it from database it shows that the file is
read only and sometimes it shows that the file is corrupted ...

waiting for your reply ...

thanking y o u ...

using C# to implement Windows Service

George_George3-Apr-08 22:32

George_George

3-Apr-08 22:32

Hello everyone,

Any recommended tutorials or code about how to use C# to implement Windows Service?

thanks in advance,
George

Re: using C# to implement Windows Service

Giorgi Dalakishvili3-Apr-08 22:34

Giorgi Dalakishvili

3-Apr-08 22:34

Google not working for you?

Giorgi Dalakishvili

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my articles
#endregion

Re: using C# to implement Windows Service

George_George3-Apr-08 23:34

George_George

3-Apr-08 23:34

Found two in CodeProject, not sure whether you have better ones to recommend?

http://www.codeproject.com/KB/dotnet/simplewindowsservice.aspx[^]

http://www.codeproject.com/KB/system/WindowsService.aspx[^]

regards,
George

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