qt - Why i can't get value form QProcess use readyReadStandardOutput signal -


i working clientupdate.exe update client,so there func "getversion" latest version number:

execute::execute(qobject *parent) :     qobject(parent) {     f=father::getinstance();     ftp=new ftpprovider(this);     connect(ftp,signal(getversionfinished(qstring)),slot(handgetversionfinished(qstring))); }  void execute::getversion() {     ftp->isautodownloadfolder=false;     ftp->getversion(); } void execute::handgetversionfinished(qstring version) {     f->mkinfo(q_func_info,qstring("the lasest version num is：%1").arg(version));     qtextstream out(stdout);     out<<version;     std::cout<<version.data();     std::cout.flush();

//* can version num here. }

in client program try version number; this

void mainwindow::on_checkupdateact_triggered() {     qstring filepath=paths::currentexefilepath();     qstringlist args;     args<<"getversion"<<filepath;     f->mkinfo(q_func_info,qstring("start check version"));     connect(&restartprocess,signal(readyread()),slot(handupdateexereadyread()));     connect(&restartprocess,signal(readyreadstandardoutput()),slot(handupdateexereadyread()));     connect(&restartprocess,signal(finished(int,qprocess::exitstatus)),slot(handrestartfinished(int,qprocess::exitstatus)));     restartprocess.start("clientupdate.exe",args); }  void mainwindow::handupdateexereadyread() {     qstring version=restartprocess.readall();     restartprocess.terminate();     f->mkinfo(q_func_info,qstring("the lasest version num is：%1").arg(version));       if(currentversion>=version.tofloat())      {          f->msg->info("update client","your client latest version");      }      else      {          if(f->msg->ask("update client?",qstring("the latest version is:%1,your version is：%2.\nupdate？").arg(version).arg(currentversion))==qmessagebox::yes)              sendupdatecommand();      }  }

but nothing in handupdateexereadyread func, why why why


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