how to run unix commands in qt creator in qt4.0

[narlapavan]

in qt3.3 i used to append QString directly to system command but in qt4.0 it is saying can't convert from QString to const char*
Example in QT 3.3
QString str ="ls -ltr";
system(str); // it is working in qt3.3, when i am running same statement in qt creator it giving can't convert from QString to const char*
any help???

[Lykurg]

Well, have you tried to convert QString to const char* yourself and then pass it to the function?

[narlapavan]

i tried that to its not wrking

[Lykurg]

So what have you tried? On my side manual conversion just works perfect.

[narlapavan]

QString str = "ls -ltr";
const char *cWrd = str;
system(cWrd);

ERROR::
error: cannot convert ‘QString’ to ‘const char*’ in initialization

---

Added after 9 minutes:

ok thanks for ur interest i found how to convert

QString str= "ls -ltr";
const char *c = str.toLocal8Bit().data();

[Lykurg]

Yes, that's the function you need. But this can crash (not likely but possible) because toLocal8Bit() creates a temporary byte array. So better write:

QString str= "ls -ltr";
QByteArray ba = str.toLocal8Bit();
system(ba.data());

QString str= "ls -ltr";
QByteArray ba = str.toLocal8Bit();
system(ba.data());

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[wysota]

Or just:

system("ls -ltr");

system("ls -ltr");

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or:

QByteArray ba("ls -ltr");
system(ba.constData());

QByteArray ba("ls -ltr");
system(ba.constData());

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There is no point in going through Unicode (which is what QString uses internally) if you don't need it.