How can i convert hexadecimal to binary in qt?

[oneSwarm]

Hi,
How can i convert a hexadecimal to binary in qt?
I am trying as below but its not working....

I am reading hexadecimal as a string(actually this number resides inside a file, hence reading as a string)
then converting this string into hexadecimal,
then converting this to binary...
the code as shown below...

this function takes hexadecimal value as string then returns the binary corresponding value

int FilterColl::BinVal(QString str)
{
    bool ok;
 
    int iVal=str.toInt(&ok,16);
    if(ok)
    {
        QString hexnum=QString::number(iVal,16);
        std::cout<<"THE HEX VALUE IS:"<<hexnum.toStdString()<<endl;
        bool ok1;
        iVal=hexnum.toInt(&ok1,2);
        {
        cout<<"THE BINARY VALUES IS:"<<iVal<<endl;
        return iVal;
        }
    }
    else
    {
        cout<<"CONVERSION FAILED   !!!!!!!!!!!!!"<<endl;
        iVal=0;
        return (iVal);
    }
}

int FilterColl::BinVal(QString str)
{
    bool ok;

    int iVal=str.toInt(&ok,16);
    if(ok)
    {
        QString hexnum=QString::number(iVal,16);
        std::cout<<"THE HEX VALUE IS:"<<hexnum.toStdString()<<endl;
        bool ok1;
        iVal=hexnum.toInt(&ok1,2);
        {
        cout<<"THE BINARY VALUES IS:"<<iVal<<endl;
        return iVal;
        }
    }
    else
    {
        cout<<"CONVERSION FAILED   !!!!!!!!!!!!!"<<endl;
        iVal=0;
        return (iVal);
    }
}

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something wrong in line 11 iVal=hexnum.toInt(&ok1,2); (hexnum is a string"FF", take a look at QString::toint(&bool,base))
If base is 0, the C language convention is used: If the string begins with "0x", base 16 is used; if the string begins with "0", base 8 is used; otherwise, base 10 is used.

if you add hexnum=QString::number(iVal,2); before it ,then it will performs fine.