Strage problem Writing to a Notepad file

Hello every one. I have a small problem i am writing to a notepad file every 30 seconds. Everything works fine but after some time there is some extra text written after the end of file i am actually updating the file with temperature data which i acquire and dumb into data base.

Code:

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void datadisplay::datatcplog()
{
 newfilenames = newdatpath; //"E:/DataLog/"+ QDateTime::currentDateTime().toString("ddd dd-MM-yyyy, hh.mm") +".txt";  
 
QSqlQuery sq1("SELECT "+ colames +" FROM thdata where rowid  = (select max(rowid) from thdata)");
 
	while(sq1.next())
		{
			for (int i = 0; i < ntnewtempchnames.count(); i++)
				{
					txtdata.push_back(sq1.value(i).toString());	
				}
		}
 
	qDebug()<<"NotePad Log file Temperature Data:"<< txtdata;
 
		QString notepadfl;
		notepadfl.clear();
		notepadfl.append(QTime::currentTime().toString("hh:mm:ss"));
        	numbch=ntnewtempchnames.count();
 
		file5 = new QFile(newfilenames);
        	file5->open(QFile::ReadWrite | QFile::Text);
 
		QTextStream out8(file5); 
 
		out8 <<"START OF FACILITY DATA" ;
		out8 <<"\n" <<"";
		out8<<notepadfl<<' '<<newnote<<"\n";
		out8 <<"\n" <<"";
 
		out8 <<"VACUUM PARAMETERS";
		out8 <<"\n" <<"";
		out8 <<"0" <<"";
		out8 << vaccumparameters.size();
		out8 <<"\n" <<"";
 
		out8 <<"\n" <<"";
		out8 <<"MOTION SIMULATOR PARAMETERS";
		out8 <<"\n" <<"";
		out8 <<"0" ;
		out8 <<"\n" <<"";
 
		out8 <<"AYDIN VECTOR PARAMETERS";
		out8 <<"\n" <<"";
		out8 <<ntnewtempchnames.count();
		out8 <<"\n" <<"";
		 for(int d = 0;d < ntnewtempchnames.count();d++)
		{
			out8 << nttempidnames.at(d)<<' '<<txtdata.at(d)<< "\n";
		}
		out8 <<"\n" <<"";
 
		out8 <<"END OF FACILITY DATA";
		file5->close(); 
	nttempidnames.clear();
	txtdata.clear();
}

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This is the text file which is generated but after some time i get some extra text written more then what i write in the program.

Code:

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START OF FACILITY DATA
10:21:39 
VACUUM PARAMETERS
0
MOTION SIMULATOR PARAMETERS
0
AYDIN VECTOR PARAMETERS
10
TE 5000_1 -120
TE 5000_2 -120
TE 5000_3 -120
TE 5000_4 -120
TE 5000_5 -120
TE 5000_6 -120
TE 5000_7 -120
TE 5000_8 -120
TE 5000_9 -120
TE 5000_10 -120
END OF FACILITY DATA

---

Code:

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START OF FACILITY DATA
10:21:39 
VACUUM PARAMETERS
0
MOTION SIMULATOR PARAMETERS
0
AYDIN VECTOR PARAMETERS
10
TE 5000_1 -120
TE 5000_2 -120
TE 5000_3 -120
TE 5000_4 -120
TE 5000_5 -120
TE 5000_6 -120
TE 5000_7 -120
TE 5000_8 -120
TE 5000_9 -120
TE 5000_10 -120
END OF FACILITY DATA
// But i get some extra text below after this i am not actually writing any thing after END OF FACILITY DATA but then this extra text is written. 
0
TE 5000_606 -150
TE 5000_626 -150
 
DIRECT THERMOCOUPLE PARAMETERS
0
END OF FACILITY DATA
TE 5000_606 -10.3
TE 5000_626 -10.3
 
DIRECT THERMOCOUPLE PARAMETERS
0
END OF FACILITY DATA49.8
 
DIRECT THERMOCOUPLE PARAMETERS
0
END OF FACILITY DATA

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Don't know whats wrong here. Some can see some thing wrong in the program. ?

Thank you

try adding these at the end

Code:

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out8 <<"END OF FACILITY DATA";
out8.flush(); // Generally not required
file5->close(); 
delete file5; // Add this

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Hello Anna thankx for the reply . .. i have added the below code which you suggested, but it din work. There is still some extra data after some 5 updates into the notepad.

Code:

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out8.flush(); 
file5->close(); 
delete file5;

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wondering what is happening in the program it looks so simple and plain in the program what can be going wrong at all.

regrads

Couple of question to help me understand better...
Is void datadisplay::datatcplog() a slot ?
Is void datadisplay::datatcplog() is called every 30 sec?
Do you use file5, out side void datadisplay::datatcplog() function?

Quote:

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Originally Posted by nagabathula

Code:

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void datadisplay::datatcplog()
{
		file5 = new QFile(newfilenames);
        	file5->open(QFile::ReadWrite | QFile::Text);

---

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You should use QFile::WriteOnly instead of QFile::ReadWrite in your case.

Yea datatcplog() is a slot. I am calling it with a timer every 30 seconds. I have not used file5 any where else in the program.
I have another routine of writing to a excel file i have named it file4 and there is no problem at all, it logs into excel with out any extra char's. Its only the notepad file which i have a problem. And all the containers which have the data for notepad file are different from the excel logging data containers so there should be nothing extra i am clearing all the containers at the end of the writing function.

Quote:

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connect(logtimer, SIGNAL(timeout()), this, SLOT(datatcplog()));

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Added after 6 minutes:

hi dbzhang800 i have changed as you have suggested. In testing now. !! it seems to work there is nothing extra after 5 minutes of logging will check for longer duration. ..

Thank you