c++ - Outputting QProcess readAll response to label -

i have qprocess output response in label. first off, here have tried:

qprocess *proc = new qprocess(); proc->setprocesschannelmode(qprocess::mergedchannels); proc->start(cmdlinerequest.toutf8().constdata()); // cmdlinerequest omitted  if (!proc->waitforfinished()) {     qdebug() << "make failed:" << proc->errorstring();     ui->topbarcode->settext(qstring(proc->errorstring())); } else {     qdebug() << "make output:" << proc->readall();      ui->topbarcode->settext(qstring(proc->readall()) + "asdf"); } 

proc->readall() qbytearray , settext accepts qstring. i've read, should able cast qbytearray qstring, howver not work. have tried convert proc->readall() qstring class

->settext(qstring::fromutf8(proc->readall())) // not working ->settext(qstring::fromlatin1(proc->readall())) // not working ->settext(qstring::fromlocal8bit(proc->readall())) // not working ... etc ... 

it seems weird, since i'm adding pictures labels in same matter using setpixmap(qpixmap::fromimage(image))

any appreciated, thank you.

update:

if add qmessagebox before end of method above block of code belongs to, can see text added label. when close qmessagebox, text dissapears. giving address position label proc->readall() or how come behaviour? thank you.

the problem here you're calling proc->readall twice; first qdebug output , again string set on label.

{     qdebug() << "make output:" << proc->readall();     ui->topbarcode->settext(qstring(proc->readall()) + "asdf"); } 

i expect qprocess qiodevice, it's returning buffered byte array. when read it, removes buffer.

therefore, create temporary string , read buffer once, before calling qdebug , setting string label: -

{     qstring output = proc->readall();     qdebug() << "make output:" << output;     ui->topbarcode->settext(output + "asdf"); }