Conversion from QString to quint32

[sksingh73]

I am taking an input from line edit box which is QString by default. I further want to convert this value from QString to quint32. Any suggestions on how to implement this.

[QbelcorT]

Hi
If it's a QString then you can use the built in function QString::toUInt(). Read the Qt Assistant docs.

[sksingh73]

I want to convert from QString to quint32 & not unsigned int. I have checked Qt Assistant docs, but was not able to find anything there.

[Zlatomir]

http://doc.trolltech.com/4.2/qtgloba...uint32-typedef

[sksingh73]

My code is below, but its not working. Can you suggest corrections in it. Thanx in advance.

QString phrase, bobkey, bobid;
phrase = stringlineEdit->text();
bobkey = keylineEdit->text();
bob_initialkey = (quint32)bobkey.toInt();
bob_userid = (quint32)useridlineEdit->text().toInt();
resulttextEdit->append( "BOB Initial Key: " + display_uint(bob_initialkey) ); //Here output is 0.
resulttextEdit->append( "BOB user ID: " + display_uint(bob_userid) ); //Here output is 0.
qDebug() << "BOB Initial Key: " << bobkey; //This is showing correct value
qDebug() << "BOB Initial Key: " << bob_initialkey; //Here output is 0.

[Zlatomir]

Do like this:

QString testInt = "4294967295"; /*make sure that in QString you don't have a big number, that will not fit in unsigned int32*/
    quint32 test = testInt.toUInt();

QString testInt = "4294967295"; /*make sure that in QString you don't have a big number, that will not fit in unsigned int32*/
    quint32 test = testInt.toUInt();

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I guess that you don't take the values from that lineEdit, and the string remains empty.
You can use signal and slots to connect the text changed in QLineEdit to a slot (defined by you) witch will initialize the string variables.

If you can't get it to work post the OS, Qt version... and a sample compilable example that replicate the issue.

[sksingh73]

its working fine when i am giving input as decimal value. but when i enter hexadecimal value, it displays value as 0.

[Zlatomir]

QString testInt = "4294967295";  //biggest value
    quint32 test = testInt.toUInt();
 
    str = "FF";
    bool ok;
 
    quint32 hex = str.toUInt(&ok, 16);     // hex
    quint32 dec = str.toUInt(&ok, 10);     // dec
 
    qDebug() << test;
    qDebug() << hex;
    qDebug() << dec;

QString testInt = "4294967295";  //biggest value
    quint32 test = testInt.toUInt();

    str = "FF";
    bool ok;

    quint32 hex = str.toUInt(&ok, 16);     // hex
    quint32 dec = str.toUInt(&ok, 10);     // dec

    qDebug() << test;
    qDebug() << hex;
    qDebug() << dec;

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[sksingh73]

Thanks buddy.

[Zlatomir]

Just a little note:

bool ok;       // you can check the bool variable to see if the conversion worked
 
    quint32 hex = str.toUInt(&ok, 16);     // hex 
    //here the ok will be true, and quint32 hex will be 255 
    quint32 dec = str.toUInt(&ok, 10);     // dec
    //here the bool variable will become false because the FF isn't an integer, and quint32 dec will be 0;

bool ok;       // you can check the bool variable to see if the conversion worked

    quint32 hex = str.toUInt(&ok, 16);     // hex 
    //here the ok will be true, and quint32 hex will be 255 
    quint32 dec = str.toUInt(&ok, 10);     // dec
    //here the bool variable will become false because the FF isn't an integer, and quint32 dec will be 0;

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Or you can use string that begins with "0x" and base 16 will be used; if the string begins with "0", base 8 is used; otherwise, base 10 is used.