rename file name

[vishwajeet.dusane]

I m sorry but which document u r referring (is it assistant). It does not say anywhere that no need to close file before renaming.
Please correct me if i m wrong.

However i m confused with statement

The file is closed before it is renamed.

Does that mean implicitly this will be done or developer has to that explicitly.

[weixj2003ld]

Thk u for your answer.

I have used static implementation of rename,problem still exists.

I want to modify some contents of a text file,and do as follows:
1.open the text file(a.txt),and read the contents of it and modify some of it.
2.write the modified contents in a new file(b.txt);
3.delete a.txt
4.rename b.txt to a.txt.

now rename can not work properly,what other ways should I go?

[aamer4yu]

Try using absolute paths for renaming...
Also do you have rights to change file names on your system ?

[kevinchannon]

I want to modify some contents of a text file,and do as follows:
1.open the text file(a.txt),and read the contents of it and modify some of it.
2.write the modified contents in a new file(b.txt);
3.delete a.txt
4.rename b.txt to a.txt.?

Do you have a specific reason for doing all these steps? If you:

1. open the file
2. read in the data
3. close the file
4. change the bits you want to change
5. re-open the file (but for writing this time)
6. write the the new data

this should write over all the old data. That way you don't have to worry about changing the name at all.

[borisbn]

I m sorry but which document u r referring (is it assistant). It does not say anywhere that no need to close file before renaming.
Please correct me if i m wrong.

However i m confused with statement

Does that mean implicitly this will be done or developer has to that explicitly.

yea, it means, that you don't have to close files see QFile::rename docs

weixj2003ld, try this:

QFile f( "a.txt" );
if ( f.open( QIODevice::ReadOnly ) )
{
    QString fileContent = f.readAll();
// modify fileContent
    if ( f.open( QIODevice::WriteOnly | QIODevice::Trancate ) )
    {
        f.write( fileContent.toAscii() );
        f.close();
    }
}

QFile f( "a.txt" );
if ( f.open( QIODevice::ReadOnly ) )
{
    QString fileContent = f.readAll();
// modify fileContent
    if ( f.open( QIODevice::WriteOnly | QIODevice::Trancate ) )
    {
        f.write( fileContent.toAscii() );
        f.close();
    }
}

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[weixj2003ld]

I have try the method borisbn provided,it is ok. thk u all.