VB.Net, Replacing a single line from a text file

Replacing a single line from a text file

Author	Message
Dinesh Jai #1 / 7	Replacing a single line from a text file Hello all, I want to replace a single line from a text file. I have the line number of which the text should be repleced. How to achieve this ? I am using StreamReader and StreamWriter classes. Please help, -Regards, Dinesh Jain. *** Sent via Developersdex http://www.--.com/ ** Don't just participate in USENET...get rewarded for it!
Sun, 11 Sep 2005 22:53:10 GMT

Armin Zingle #2 / 7	Replacing a single line from a text file Quote: > Hello all, > I want to replace a single line from a text file. > I have the line number of which the text should be > repleced. How to achieve this ? > I am using StreamReader and StreamWriter classes. You must copy the content before the line to the new file, then write the new line and copy the content after the line. Optimization, only possible if length of new and old line is equal: Store the byte position within the file when reading so you can use binary access and write the new line to the same position. Armin
Sun, 11 Sep 2005 23:39:07 GMT

Chris Dunawa #3 / 7	Replacing a single line from a text file Quote: > You must copy the content before the line to the new file, then write > the new line and copy the content after the line. If the data to be written is the same length as the data being replaced, he can just overwrite it. I'm not sure if streams support this however. -- If you don't like lunchmeat, please remove it from my e-mail address to send me an e-mail
Mon, 12 Sep 2005 01:54:12 GMT

Armin Zingle #4 / 7	Replacing a single line from a text file Quote: > > You must copy the content before the line to the new file, > > then write the new line and copy the content after the line. > If the data to be written is the same length as the data being > replaced, he can just overwrite it. Right, that was the second part of my answer (that you didn't quote). :-) Quote: > I'm not sure if streams > support this however. Yes, you can set the position property. Armin
Mon, 12 Sep 2005 02:07:59 GMT

Chris Dunawa #5 / 7	Replacing a single line from a text file Quote: > Right, that was the second part of my answer (that you didn't quote). :-) So it was. Don't know why I missed that. Brian hiccup I guess. -- If you don't like lunchmeat, please remove it from my e-mail address to send me an e-mail
Mon, 12 Sep 2005 03:49:32 GMT

Dinesh Jai #6 / 7	Replacing a single line from a text file Hi , Thanks for your valuable replies. I got the method. While reading text file(using Stream Reader), I have calculated the byte position-where to write. But remember, new line character is of 2 bytes. That is read each line of text then increment the counter by string length + 2(end of line). Then user StreamWriter and seek at that location and write the string. The lengths of old string and new string should be same. Is it the rigth method ? -Regards, Dinesh Jain. * Sent via Developersdex http://www.developersdex.com * Don't just participate in USENET...get rewarded for it!
Mon, 12 Sep 2005 12:34:34 GMT

Armin Zingle #7 / 7	Replacing a single line from a text file Quote: > Thanks for your valuable replies. > I got the method. > While reading text file(using Stream Reader), I have calculated > the byte position-where to write. > But remember, new line character is of 2 bytes. > That is read each line of text then increment the > counter by string length + 2(end of line). > Then user StreamWriter and seek at that location > and write the string. > The lengths of old string and new string should be > same. > Is it the rigth method ? Sounds good. Armin
Mon, 12 Sep 2005 18:59:36 GMT

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