how to determine if the mount successful in QT code - qt

Question

I have this function on mounting a smb:// connection. What if there is an error that is not in my condition. Is there a better way to determine if the mount is sucessful or not? Im using ubuntu 11.04 and qt 4.7.3
bool mwDM::mountFolder()
{
QString smbUsername,smbPassword,serverPath,mountPath;
QProcess connectSamba;
QString terminalCommand,linuxPassword;
QDir dir("/mnt/backup");
smbUsername=ReadINIStr(iniPath,"Server","Username","");
smbPassword=ReadINIStr(iniPath,"Server","Password","");
serverPath=ReadINIStr(iniPath,"Server","Hostname","");
serverPath="//" + serverPath;
mountPath="/mnt/backup";
linuxPassword=ReadINIStr(iniPath,"Server","AdminPassword","");
terminalCommand="echo "+linuxPassword+" | sudo -S mount -t cifs -o username="+smbUsername+",password="+smbPassword+" "+serverPath+ " "+mountPath;
connectSamba.start("sh",QStringList() << "-c" << terminalCommand );
if(!connectSamba.waitForStarted())
{
LogWrite("Failed to start mount command", Qt::red);
}
if(!connectSamba.waitForFinished() )
{
LogWrite("Failed to finish mount command", Qt::red);
}
QString connectSamba_stderr = connectSamba.readAllStandardError();
qDebug() << "connectSamba_stderr" << connectSamba_stderr;
if(connectSamba_stderr.contains("is not a valid block device"))
{
LogWrite("Hostname is invalid", Qt::red);
return false;
}
else if(connectSamba_stderr.contains("3 incorrect password attempts"))
{
LogWrite("Admin password is incorrect", Qt::red);
return false;
}
else if(connectSamba_stderr.contains("wrong fs type, bad option, bad superblock on"))
{
LogWrite("Hostname is invalid", Qt::red);
return false;
}
else if(connectSamba_stderr.contains("Invalid argument"))
{
LogWrite("Mount error(22): Invalid argument", Qt::red);
return false;
}
else if(!dir.exists())
{
LogWrite("Directory doesn't exists", Qt::red);
return false;
}
else
{
return true;
}
}

Answer 1

You can check last error of a QProcess by using error and state functions (Documentation for "error" Documentation for "state").
"What if there is an error that is not in my condition."
You can add something like this in your code:
else if(connectSamba.state() == QProcess::NotRunning && connectSamba.error() >= 0)
{
LogWrite("Unknown error", Qt::red);
return false;
}
Or, if you want to give more specific information, you can create a condition for each error code separately. Here's a list of codes.
Alternatively, don't add the above block to the error checking code. Instead, create a slot to which you connect the error signal of connectSamba class:
// add this line below "QProcess connectSamba;" line in mwDm::mountFolder
connect(&connectSamba, SIGNAL(error(QProcess::ProcessError)), this, SLOT(onError(QProcess::ProcessError));
// after that, use your original error checking code in mountFolder
// slot code
void mwDm::onError(QProcess::ProcessError)
{
//use switch-case or if to check type of error if you want
processErrorOccurred = true; // processErrorOccurred is a member of mwDm
}