QTextStream, input and readLine()

[kramed]

Hi. I seem to have a problem where I dont understand the cause. I have read as much as I can trying to figure out what is my problem but alas, here I am humbly seeking assistance.

I am working on a small and simple gui to generate plaintext config files that will be read by another program. I have output working fine but the problem arises when I try to input a QString that has spaces (a windows pathname to My Documents), my input is truncated at the first space in the string.

My settings file looks like this (or very similar):

server=example.com
protocol=sftp
port=23
username=mark
password=
backupdir=c:\My Documents\backup
firefox=1
path=c:\Program Files\Firefox\firefox.exe

I use QString::section() to get rid of the variable label which seems to work. Its just that pesky white space.

//###########################
void MainWindow::load()	 
//###########################
{
    QString str, chopped;
    int num;
 
    QFile file("settings.cfg");
 
    if (!file.open(QIODevice::ReadOnly))
    {
        cerr << "Cannot read file for loading: " << qPrintable(file.errorString()) << endl;
        loadDefaults();
          return;
    }
 
    QTextStream input(&file);
 
	// Server
	input >> str;
	chopped = str.section('=', 1);
	server_lineEdit->setText(chopped);
 
	// Protocol
	input >> str;
	chopped = str.section('=', 1);
	if ( chopped == "sftp" )
		sftp_radioButton->setChecked(true);
	else
		ftp_radioButton->setChecked(true);
 
	...
 
	// Backup Directory
	//input >> str;
        QString line = input.readLine();
	chopped = line.section('=', 1);
	backup_dir_lineEdit->setText(line);
 
	// Firefox
	input >> str;
	chopped = str.section('=', 1);
 
	if (chopped == QString::number(1))
		firefoxBox->setChecked(false);
	else
		firefoxBox->setChecked(true);
	// Path
	input >> str;
        //str = input.readLine();
 
	chopped = str.section('=', 1);
	firefox_path_lineEdit->setText(chopped);
 
}

//###########################
void MainWindow::load()	 
//###########################
{
    QString str, chopped;
    int num;

    QFile file("settings.cfg");
     
    if (!file.open(QIODevice::ReadOnly))
    {
        cerr << "Cannot read file for loading: " << qPrintable(file.errorString()) << endl;
        loadDefaults();
          return;
    }
        
    QTextStream input(&file);
	
	// Server
	input >> str;
	chopped = str.section('=', 1);
	server_lineEdit->setText(chopped);

	// Protocol
	input >> str;
	chopped = str.section('=', 1);
	if ( chopped == "sftp" )
		sftp_radioButton->setChecked(true);
	else
		ftp_radioButton->setChecked(true);

	...

	// Backup Directory
	//input >> str;
        QString line = input.readLine();
	chopped = line.section('=', 1);
	backup_dir_lineEdit->setText(line);

	// Firefox
	input >> str;
	chopped = str.section('=', 1);
	
	if (chopped == QString::number(1))
		firefoxBox->setChecked(false);
	else
		firefoxBox->setChecked(true);
	// Path
	input >> str;
        //str = input.readLine();
   
	chopped = str.section('=', 1);
	firefox_path_lineEdit->setText(chopped);

}

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As you can see I have tried readLine() and a normal stream operators. The code in there now, the readLine() does not return anything to the lineEdit and if I switch it back to str << ... I get truncated path names. Please can someone point me in the direction of what I need. Thanks!

[Wizard]

Try this:

str = QString::fromLocal8Bit(file.readLine().data());
chopped = str.mid(str.indexOf('=')+1);

str = QString::fromLocal8Bit(file.readLine().data());
chopped = str.mid(str.indexOf('=')+1);

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[kramed]

Unfortunately that did not work. Even ignoring the chopped var and trying to load the QString str into the lineEdit didn't work. Thanks for the help though.

[marcel]

But can you read the entire line correctly from the stream?
For example, can you read: "backupdir=c:\My Documents\backup"?

Because there are other ways, for example QString::split("=");

Regards

[kramed]

Unfortunately the only time that anything is loaded into the QLineEdit is when I use the code input >> str;

I tried Wizards suggestion without using a seperate or split function on the string but that method does not load the LineEdit with anything. What was forming to be a very simple program in Qt has turned quite frustrating as I do not know what else to try. Is there something about line endings that I am missing ? Maybe I need to output to the terminal what is getting loaded by the readLine() method.

[kramed]

I believe I have isolated the problem. I use a QMessageBox to read back to me the QString after it is read from the stream. I used:

Line being read from .txt: backupdir=C:/Documents and Settings/Mark/Sync

1.) input >> str;

2.) str = input.readLine();

3.) str = QString::fromLocal8Bit(file.readLine().data());

Only number 1 returned anything other than a null variable. The whole problem is it only returns C:/Documents.

[kramed]

After a couple days I finally solved my problem. It seems that when reading a file you cant use a >> input stream operator and then use readLine(), you must use only one for each open stream. I switched all my input lines to readLine() and it worked.