Re: FileStream runtime issues (Updated) - C# Discussion Boards

Re: FileStream runtime issues

15-Aug-09 14:59

I have my reasons for this, I am new to reading files, but I intend to be able to either read the whole file, or move to a specified start point and read from that point. I did look through the other classes available and it seemed FileStream was the only class capable of this (maybe I missed something). I had just simplified my code in an attempt to try and find what was going wrong.

modified on Saturday, August 15, 2009 10:17 PM

riced15-Aug-09 23:09

riced

15-Aug-09 23:09

Here's a guess as to what is happening.
The code that is creating the file runs and writes part of the file while keeping the file open. (I suspect it does this for each game.)
The code that you show is then triggered so it reads the file but only up to the point that has been written (i.e to end of first game.)
When you close the program the entire file is written so the next time you run it it works.

BTW regarding your use of ReadByte, you can use Seek to move about in the file (if it supports it) but this is probably only useful if the file contains fixed length 'records' with one record per line. I cannot see how this would be useful in the example file. Smile | :)

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Re: FileStream runtime issues

Mikey_H15-Aug-09 23:22

15-Aug-09 23:22

It is my intention to run this while another program writes to the text file. But I am not to that point yet. I am not running the other program while testing my own code here. These are previously saved files I'm attempting to read.

riced16-Aug-09 0:18

riced

16-Aug-09 0:18

I think this is just a MessageBox problem.
I tried it with the two lines you added and got the impression from the MessageBox that only part of the file had been read.
However, not so - it has all been read.
To check this I added a textbox, set its multi-line property to True and added vertical scroll bars.
I then set textbox1.Text = data; - result: all present and correct. Smile | :)

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Mikey_H16-Aug-09 1:44

16-Aug-09 1:44

The messagebox shows a partial file, but when I open the file from win explorer and save the file (I'm not sure what this actually affects), then messagebox will show the complete file the next time the program is run. I forgot to point out in original post that the line where the file always ends (if not opened and saved) is at a variable position, there can be any number of lines before this, but this is where it will always end (Player wins $xxx).

riced16-Aug-09 2:32

riced

16-Aug-09 2:32

I can't reproduce this problem so don't know how to solve it.
There is the possibility that it is just a MessageBox issue.

I created a form as I said before with button and multiline textbox then added this code as click handler.

private void button1_Click(object sender, EventArgs e)
{
   //FileInfo m_FileInfo = new FileInfo("C:\\Playpen\\poker_utf8.txt");
   FileInfo m_FileInfo = new FileInfo("C:\\Playpen\\poker.txt");
   long fileLen = m_FileInfo.Length;
   byte[] buffer = new byte[fileLen];

   using (FileStream stream = new FileStream(m_FileInfo.FullName, FileMode.Open, FileAccess.Read))
   {
      // Read data from file to the buffer
      for (long i = 0; i != fileLen; i++)
         buffer[i] = (byte)stream.ReadByte();
   }

   string data = new System.Text.UTF8Encoding(true).GetString(buffer);
   long strLen = data.Length;
   MessageBox.Show("Len of buffer: " + fileLen.ToString() + "\r\nLen of data  : " + strLen.ToString());
   textBox1.Text = data;
   MessageBox.Show(data); // Shows incomplete file
}

Set a breakpoint on 'string data = ...' and then step through it.
The data string does contain whole of file. And this is confirmed by the textbox contents.
I created poker.txt by copying your text and doing multiple pastes using Notepad. poker_utf8.txt is the same file saved as UTF-8.
(You get a slight discrepancy in lengths when using poker_utf8 because the UTF-8 has a three byte BOM as a prefix.)

Regards
David R
---------------------------------------------------------------
"Every program eventually becomes rococo, and then rubble." - Alan Perlis

Mikey_H16-Aug-09 12:48

Reading letters from an Image in C#

16-Aug-09 12:48

Thanks for the help David, I appreciate it.

I have tried this stuff already and I made an edit to original post, saying it is reading to the buffer and the issue is elsewhere (size of byte[] = size of string = size shown in file properties) (I should have made a reply pointing to the updated info also).

I don't know anything about the encoding though, I tried utf8 as it was in the msdn sample, and it worked for the first section of the file, so I assumed this wasnt the issue.

Also worth noting that after this code the string is put through a StringReader where I run regular expressions on it and convert the data from the hand info into a 'PokerHand' object, if I run the program without doing the 'save thing' each file returns 1 'PokerHand' object, if I do the 'save thing' it returns as many that are in the file.

Sumit_Ghosh15-Aug-09 12:41

Sumit_Ghosh

15-Aug-09 12:41

I have an image with letters in it, the letters are in two colors black and blue, I want to read the blue colored letters from the image.

Can anyone suggest me a method to do this in C#. Iam studying GDI+,but still didn't get any logic to develop this program..

Any guidance is highly appreciated.

Thanks,

Sumit Ghosh
Globussoft

Re: Reading letters from an Image in C#

Henry Minute15-Aug-09 13:24

Henry Minute

15-Aug-09 13:24

I don't know if this would help you Creating Optical Character Recognition (OCR) applications using Neural Networks[^].

Or maybe this one Image to Characters Converter using Intensity[^].

They should at least give you some ideas.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Web Browser(C# + other .NET technologies)

abhifanatic15-Aug-09 10:12

abhifanatic

15-Aug-09 10:12

Every1 talk about web browser in Java or C++ etc. etc.
But for the first tm I took up the challenge in .NET environment as my college final yr project...(Although forecasting as Simple & Best for my level..not extra junk... but yet essentially should be very viable)
Not By using C# GUI Drag & Drop Web Browser Control component already available in Visual Studio...But my very own web browser...
Can sm1 pls Clearly state me with the major modules that would clearly specify the diff. parts of my project....

I m still pursuing .NET course(completed C# currently started ASP) & m contemplating a lot to travel on a well defined line of course...cos time is less....

Re: Web Browser(C# + other .NET technologies)

Saksida Bojan15-Aug-09 10:29

15-Aug-09 10:29

you coud look into System.Web.HttpRequest

as i search, browser capable machine are easly to make as long you don't want to parse every html/css/javascript

Here are couple links that shows it.

Microsoft Web Browser Automation using C#[^]
Using the WebBrowser control in .NET[^]
Web browser in C# and VB.NET[^]
MSDN[^]
http://forums.tizag.com/showthread.php?t=8892[^]
http://www.c-sharpcorner.com/UploadFile/kapilsoni88/WebBrowser_In_DotNet_203162009043331AM/WebBrowser_In_DotNet_2.aspx[^]

and there is plenty more. You can yust google it

C# IP Scanner

nhqlbaislwfiikqraqnm15-Aug-09 10:06

15-Aug-09 10:06

Hey guys!

Can somebody help me to make a Ip scanner for Server and client. And when the Client can connect one IP i want to show me the ip in a TextBox. He should scan all ip´s from x to y and every ip he can connect should he show me in a textbox!

Saksida Bojan15-Aug-09 10:31

Implement a basic IP Scanner for a local LAN in C#[^]

15-Aug-09 10:31

nhqlbaislwfiikqraqnm15-Aug-09 10:52

15-Aug-09 10:52

i have seen that scanner. but how can i check all ip´s if i can connect them?
I want that i can see all IP´s which i can connect in the textbox but i don´t know how!

Saksida Bojan15-Aug-09 18:57

15-Aug-09 18:57

why don't you try connecting to each ip you get.
Or are you asking how to get list of ip from textbox

nhqlbaislwfiikqraqnm15-Aug-09 21:55

15-Aug-09 21:55

"why don't you try connecting to each ip you get."
Yes but then he will always connect the same IP!
And i want to show me all IP´s which i can connect in a textbox.
Then i have a other textbox for the connecting there i enter the Ip(from the textbox where i can see all open ip´s) that i want.

Saksida Bojan15-Aug-09 22:02

15-Aug-09 22:02

I dont quite follow you, because it is hard to understand.

PC17 wrote:
Yes but then he will always connect the same IP!

Are you feeding him same ip?

PC17 wrote:
And i want to show me all IP

So you use textbox for showing IP? You coud have selected multiline property to true for textbox or did you use ListView or ListBox control for showing?
Doues your control shows diffrent ip?

Or you use only 2 textboxes that have range of scan?

mrcooll15-Aug-09 22:43

mrcooll

15-Aug-09 22:43

hello ,

try to implement this algorithm

//this is not code
foreath(ipaddress ip in GetAllIps()){

if( CreateThread(Ping(ip))){
AddToList(ip);
}

}

nhqlbaislwfiikqraqnm15-Aug-09 22:50