Qt ASCII to IP function

Question

I'm attempting my hand at creating a UDP terminal (custom) using Qt - Does anyone know if there's a widget or class for handling the conversion of the IP address from ASCII to numeric (hex) or do I have to write that myself? Basically "192.168.1.1" -> "0xC0A80101". I'm not opposed to writing it, just want to know if anyone knows if it already exists. Tried searching, not much luck. Thanks all

Answer 1

The key class here is QHostAddress as follows:

main.cpp

#include <QHostAddress>

#include <QTextStream>
#include <QString>

int main()
{
    QTextStream standardOutput(stdout);
    // You could use this, too:
    // standardOutput.setIntegerBase(16);
    // standardOutPut.setNumberFlags(QTextStream::ShowBase);
    quint32 ipAddress = QHostAddress("192.168.1.1").toIPv4Address();
    QString hexIpAddress = QString::number(ipAddress, 16);
    QString prefixedUppercaseHexIpAddress = QString("0x%1")
                                            .arg(uppercaseHexIpAddress);
    standardOutput << prefixedUppercaseHexIpAddress;
    return 0;
}

main.pro

TEMPLATE = app
TARGET = main
QT = core network
SOURCES += main.cpp

Build and Run

qmake && make && ./main

Output

0xC0A80101

Answer 2

Use QHostAddress to parse string IP representation and convert it to number. Use QString::number to convert number to hex string. See this one-liner:

qDebug() << QString::number(QHostAddress("192.168.1.1").toIPv4Address(), 16);

Output: "c0a80101"