How to write text into notepad by reloading it programatically ?

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I am writing program for write text into notepad++ , and this programs works but my question is when my data written in text file it always override the text of first line only, instead I want to write text in newline every-time when program runs. For that I have tried with some code , please have look.

Thanks for any help!

C#

if (res.StartsWith("*"))
{
  using (StreamWriter sw = new StreamWriter(@"C:\Users\MyPC\Desktop\test.txt"))
  {
    sw.WriteLine(res);
    sw.Flush();
    SendKeys.SendWait("{ENTER}");
    SendKeys.Flush();

   }
}

1> In above code res is a string which I am getting from socket and I checked for it and write it in test file. and when this method calls again at 2nd input this input should written in nextline with 1st line data remains constant.

2> In debug the above bold line in code gives error "object reference not set to an instance, nullreferenceException".

Now result :

*abc
and at 2nd time run this overriden by *xyz at same line.

Desired (sample) result:
*abc
*xyz

Posted 27-Jul-15 19:57pm

Member 11543226

Updated 27-Jul-15 20:10pm

v2

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2 solutions

Solution 1

You should use an overload of StreamWriter that supports appending to the file.

C#

public StreamWriter(
    string path,
    bool append
)

E.g.
new StreamWriter("file.txt", true /*append to file*/);

Posted 27-Jul-15 20:14pm

himanshu agarwal

Comments

himanshu agarwal 28-Jul-15 2:17am

using (StreamWriter sw = new StreamWriter(@"C:\Users\MyPC\Desktop\test.txt", true))
{
sw.WriteLine(res);
sw.Flush();
}

Aravindba 28-Jul-15 2:51am

5+

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Aravindba · Accepted Answer · 2015-07-27T20:23:00

Solution 2

Hi When going to write text in notepad,u can add this line

C#

Environment.NewLine

like this

C#

sw.WriteLine(res + Environment.NewLine);

so when write text in notepad Environment.NewLine brings second line,so if u write again in same notepad ,it automatically start from second line.

Or try this link

[^Click]

Instead of buffer u can pass string,i mean your text,

Try this code

C#

string res = "*AAA";
         if (res.StartsWith("*"))
         {
             using (StreamWriter sw = new StreamWriter(@"C:\report.txt",true))
             {
                 sw.WriteLine(res);
                 sw.Flush();


             }
         }

Regards
Aravindb

Posted 27-Jul-15 20:23pm

Aravindba

Updated 27-Jul-15 20:50pm

v5

Comments

himanshu agarwal 28-Jul-15 2:28am

This will not work as StreamWriter is being disposed after writing to the file. Next time while writing the second line, new StreamWriter will again point to start of file i.e. line 1.

You would need to seek to the end of file and then write in this case. That is what the overload of StreamWriter does.

himanshu agarwal 28-Jul-15 2:30am

In essence, WriteLine automatically adds the new line after the text, you need not enter a newline. The reason it is not working is because what I mentioned above.

Aravindba 28-Jul-15 2:31am

Or u can try to read text form notepad,if text got then add like this
if () //Text got in notepad
sw.WriteLine( Environment.NewLine + res );
else()//if not have text in notepad
sw.WriteLine(res );

Member 11543226 28-Jul-15 2:36am

this is Not worked , reload not done in notepad and data is still ovveride in same 1st line.

Aravindba 28-Jul-15 2:37am

https://www.daniweb.com/software-development/csharp/threads/202112/add-text-to-existing-text-file try this code

Member 11543226 28-Jul-15 2:39am

How to write contends of overlod method streamwriter.

Aravindba 28-Jul-15 2:51am

solution updated pls check now ,
using (StreamWriter sw = new StreamWriter(@"C:\report.txt",true))

Member 11543226 28-Jul-15 2:58am

yeah ! now it worked, thanks. Any idea for reloading notepad or word document . so that no need to opening and closing file for checking data i.e keystroke concept for all editors notepad /outlook/word etc. Thanks.

Aravindba 28-Jul-15 3:00am

Nice,if got solution mark as solution,and for reloading ,u can open new thread...

Member 11543226 28-Jul-15 3:07am

Can You give some example or any link regarding to this ? Actually not restricted to notepad I need to use any editor where the cursor placed in editor it should write text.