How to stop reading from a file?

Question

0.00/5 (No votes)

See more:

The Code is updated as below now I am able to restart but the not able to stop untill I Click button again.

C++

void CDemoDlg::ReadFileTxt()
{
	
	CFileException fileException;
       if (readFile.Open(strFilePath, CFile::modeRead, &fileException))
       {
            while ((stopSong==true )&&readFile.ReadString(strLine)){}
           
        }
}


void CDemoDlg::OnBnClickedSongPlay()
{
if(stopSong==true)
{
	
	
	stopSong=false;
	readFile.Close(); /*stops but resumes immediately so could not recognize that it actually stopped*/

	
}
else
{
	stopSong=true;
	OnLbnSelchangeListSongs();
	
}

}

Posted 12-Mar-12 1:05am

chaiein

Updated 12-Mar-12 17:40pm

v5

Add a Solution

Comments

Herman<T>.Instance 12-Mar-12 7:05am

What have you tried?

Chandrasekharan P 12-Mar-12 7:15am

Your question is not clear.
On what condition should the program stop reading the file?
Are you using some kind of a GUI? if yes, then is it come control that is stopping the reading of the text file?

Elaborate your query. It makes people here to visualize it better.

chaiein 12-Mar-12 7:22am

if (readFile.Open(strFilePath, CFile::modeRead, &fileException))
{
while (readFile.ReadString(strLine))
{
}

I have opened the file and able to read string but i want to stop, in between when i click on a button and resume or restart.

Nelek 12-Mar-12 15:07pm

chaiein, if you want to add some code of what you are trying or where you are having problems, please use the "improve question" to add it on the original message. If you only use a comment in an answer, it can be not seen by other users.

chaiein 12-Mar-12 23:02pm

ya sure thanks:)

chaiein 13-Mar-12 6:59am

I have updated so how can i change the code to pause the file reading txt or stop untill i do Onclick event.

readFile.Close(); is actually happening and immediately continues to play

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Accepted Answer · 2012-03-12T01:49:00

Solution 2

You should put the reading stuff inside a worker thread and signal to such thread the 'stop reading' condition from the GUI one (i.e. the main thread) setting a flag.
e.g.

C++

// worker thread, the 'stop_reading' variable is set by the GUI thread on button click
if (readFile.Open(strFilePath, CFile::modeRead, &fileException)) 
{ 
    while (readFile.ReadString(strLine) && stop_reading == false) { }
}

Posted 12-Mar-12 1:49am

CPallini

Comments

chaiein 12-Mar-12 8:03am

when i give this i am not able to read only its not entering the loop

CPallini 12-Mar-12 9:02am

Well, as a start condition (before actually starting the thread), the GUI thread should set stop_reading = false;

chaiein 12-Mar-12 23:20pm

This solved my problem in avoiding the warning message while opening same file again and agian.

i have stopsong=false then read.Close(); This still continues playing.

Second time when i click on the button it goes to else

chaiein 12-Mar-12 23:25pm

it stops but resumes it .Actually stops but immediately resuming it. SO the stop is not recognizable.

chaiein 14-Mar-12 4:25am

I got solved this problem i had to set the stopsong properly.Thank you :)

CPallini 14-Mar-12 4:42am

You are welcome.

Chandrasekharan P · Accepted Answer · 2012-03-12T01:35:00

Solution 1

Now DigiManus's question comes to existance. You have a problem now which you have explained. What is that you have tried??

To give you some clues.
1. Implement the Button function
2. Use Ftell/fseek functions for resuming.
3. Close function to close the file.

Posted 12-Mar-12 1:35am

Chandrasekharan P

Comments

chaiein 12-Mar-12 7:44am

void CDemoDlg::OnBnClickedSongPlay()
{
if(stopSong==true)
{

readFile.Close();

stopSong=false;
return;
}
else
{

OnLbnSelchangeListSongs();

stopSong=true;
}
return;
}

After close the Readfile is still continues what is the problem in the code above?