Qt connect without SLOT macro

[webstar]

et's say I have a string containing "function()", where function() is a slot in a class, and I would like to connect that slot with any signal, but using that string. Neither

QString f="function()";
connect (randomobject, SIGNAL(randomsignal()), this, SLOT(f));

QString f="function()";
connect (randomobject, SIGNAL(randomsignal()), this, SLOT(f));

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or

QString f="SLOT(function())";
//conversion to const char*
connect (randomobject, SIGNAL(randomsignal()), this, f);

QString f="SLOT(function())";
//conversion to const char*
connect (randomobject, SIGNAL(randomsignal()), this, f);

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work.

Is there a way to do something similar? It's important that it's a string and not a function pointer.

[stampede]

I don't think you can use this string in "connect" statement directly, but you can connect the signal to a regular slot, in which you call QMetaObject::invokeMethod

#include <QApplication>
#include <QWidget>
 
int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    const QString slotName = "show"; // no parentheses
    const QByteArray ba = slotName.toLocal8Bit();
    const char * c_str = ba.constData();
    QWidget w;
    QMetaObject::invokeMethod(&w, c_str);
    return a.exec();
}

#include <QApplication>
#include <QWidget>

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    const QString slotName = "show"; // no parentheses
    const QByteArray ba = slotName.toLocal8Bit();
    const char * c_str = ba.constData();
    QWidget w;
    QMetaObject::invokeMethod(&w, c_str);
    return a.exec();
}

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[anda_skoa]

QString f="SLOT(function())";
//conversion to const char*
connect (randomobject, SIGNAL(randomsignal()), this, f);

QString f="SLOT(function())";
//conversion to const char*
connect (randomobject, SIGNAL(randomsignal()), this, f);

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That is almost there, you just need to get a slightly different string

QString f=SLOT(function());
connect (randomobject, SIGNAL(randomsignal()), this, f.toAscii().constData());

QString f=SLOT(function());
connect (randomobject, SIGNAL(randomsignal()), this, f.toAscii().constData());

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I.e. the SLOT() macro creates a string, with the function name, any argument types and some slot specific prefix.

Cheers,
_