[SOLVED] QFile open error

[nilotpal]

Hi All,

I am trying to read a simple text file through QFile and its returning "Unknown Error".

@QFile file("E:/123.txt");
if(file.exists()){
qDebug()<<"File Exists";

QFile f(QString("E:/123.txt"));
if(f.isOpen()){
f.close();
}else{
if(!f.open(QIODevice::ReadOnly | QIODevice::Text))
qDebug()<<f.errorString();
else
qDebug()<<"It worked.";
}
}@

On executing I get the following debug lines:
@File Exists
Unknown Error@

What am I missing here?

[mlong]

Is there a specific reason you're using two different QFile objects?

[nilotpal]

Not really, that was mistake :(

Updated my code to:

@QFile file("E:/123.txt");
if(file.exists()){
qDebug()<<"File Exists";

if(file.isOpen()){
file.close();
}else{
if(file.open(QIODevice::ReadOnly | QIODevice::Text))
qDebug()<<file.errorString();
else
qDebug()<<"It worked";
}
}@

still having the same error.

[mlong]

Do you have read permission for the file on the file system? Does it work if you try to access a different file on a different drive?

[nilotpal]

Yes i have read permission for the file. In fact I have tried this on a number of files but it never worked.

Tried this code both on windows and linux but encountered the same issue.

[mlong]

Oh... you're checking the return value of file.open() incorrectly. Ir returns true on success. Your errorString() and "It worked" cases are backwards.

[nilotpal]

Bull's eye... Thank you for pointing that out

The code should have been like this:

@if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
qDebug()<<file.errorString();
else
qDebug()<<"It worked";@

[mlong]

Sometimes it's the little things that bite you! Glad to help!