can anybody explain why QStringList() used in below line ?

Qt embedded developer

i want to understand below statement

qProcessSysCmd ->start("bash",QStringList() << "-c" << sCommand.toLatin1().data());

what this statement do internally ?

sierdzio

Apparently, start() requires a QStringList. Instead of creating it earlier, like so:

QStringList args;
args.append("-c");
args.append(sCommand);

the author has decided to create it in-place (good idea, btw, it allows the compiler to optimize it). The syntax is rather old, in post C++11 world we'd rather write it like this:

qProcessSysCmd ->start("bash", { "-c", sCommand });

EDIT Removed .toLatin1().data() as it is, indeed, a bad idea to do this.

Christian Ehrlicher

@sierdzio said in can anybody explain why QStringList() used in below line ?:

sCommand.toLatin1().data()

btw: this is useless and even wrong when the command contains non-latin1 characters