Saving a password in a file

[srohit24]

Hi

I am writing a application, that takes the username and password from the user.

I want to add a feature that helps in remembering the username and password.

What i have thought was, storing the username and password in encrypted form in a file on the disk.

how will Qt support creating the file and storing it?

Where can I store the file? near the app or in My Documents/All User/ ... folder?

one more thing, How can i invoke a pop-up box to accept some text?

thanks

[spirit]

take a look at QCA. then you should provide a master key for encryption users passwords, after that when you encrypt an users password you should to convert encrypted password in base64 (this opperation will help to avoid dencrypt an user password in future, i.e. converting to base64 allows to convert special symbols). then you can store password to a file.

[srohit24]

thanks for replying so soon

What i need mainly is how to create a file and how to extract the data from it.

[spirit]

there is an example in Qt Assistant, take a look at QFile/QTextStream or QSettings.

[srohit24]

Thanks for this.

Isnt there a simple command for it?

Like

File.create(test.txt, $location); to create a file
File.open(file, mode);
File.read(file,start add, no of chars);
File.write(file,mode,string,no of chars);

thanks for ur help

[wysota]

What i have thought was, storing the username and password in encrypted form in a file on the disk.

That's generally a bad idea because you have to store the key somewhere...

Where can I store the file? near the app or in My Documents/All User/ ... folder?

Store it wherever you want QDesktopServices::storageLocation() might be a handy method here.

one more thing, How can i invoke a pop-up box to accept some text?

QInputDialog::getText()

Isnt there a simple command for it?

Like

File.create(test.txt, $location); to create a file
File.open(file, mode);
File.read(file,start add, no of chars);
File.write(file,mode,string,no of chars);

Sure there is, use QFile as suggested, although it would probably be better if you used QSettings (as suggested as well).

[srohit24]

thanks for helping mate.

the getText() thing worked fine.

Both of you have been telling me to use QFile with QSettings, can you just give me a simple example as to how i can accomplish it?

All i need is a simple file that holds 3 lines of text. I need to access all 3 lines, modify it or delete it.

I went through the documentation, there are very few examples and those haven t helped me understand much.

thanks

[spirit]

storing to QSettings

QSetting settings("settings.ini", QSettings::IniFormat);
settings.setValue("UserOption/login", "login");
settings.setValue("UserOption/password", "passw");

QSetting settings("settings.ini", QSettings::IniFormat);
settings.setValue("UserOption/login", "login");
settings.setValue("UserOption/password", "passw");

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reading to QSettings

QSetting settings("settings.ini", QSettings::IniFormat);
qDebug() << settings.value("UserOption/login");
qDebug() << settings.value("UserOption/password");

QSetting settings("settings.ini", QSettings::IniFormat);
qDebug() << settings.value("UserOption/login");
qDebug() << settings.value("UserOption/password");

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[srohit24]

thanks mate. the above code worked according to my needs.

I am trying to get a signal when the checkbox in my app is clicked.

I am using the following code.

connect(ui->checkbox, SIGNAL(stateChanged()),SLOT(checkboxclicked()));

but the function is never called even if i check or uncheck the box

any solutions??

[Lykurg]

any solutions??

Yepp, read the docs, validate your code... and use the CODE tags of this board!

To your question: You missed this

connect(ui->checkbox, SIGNAL(stateChanged()), this, SLOT(checkboxclicked()));

connect(ui->checkbox, SIGNAL(stateChanged()), this, SLOT(checkboxclicked()));

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and is checkboxclicked declared as a slot?

EDIT: and mybe you also want:

connect(ui->checkbox, SIGNAL(stateChanged(int)), this, SLOT(checkboxclicked(int)));

connect(ui->checkbox, SIGNAL(stateChanged(int)), this, SLOT(checkboxclicked(int)));

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[srohit24]

thanks for ur reply

[faldzip]

To your question: You missed this

this is not necessary. There is such connect() that takes 3 args: pointer, signal, slot. And that slot should be defined in object ponited by this.

And to srohit24:
please, use CODE tags, and use the Qt Assistant sometimes, did you use it already?

[wysota]

I'd use toggled() instead of stateChanged().