QProcess::startDetached fails on Mac

[sgmurphy19]

Use the following code to launch and external program that needs to continue running after the app that launches it closes:
QString app = "myApp";
QProcess::startDetached(app);

This works fine in windows but it fails on the Mac. Why? The app attempting the launch doens't hang, it just returns a false for success/failure.

I've tried adding the .app after the name, I've even tried setting the working directory to both the apps dir and the myApp.app/Contents/MacOS directory. Still nothing.

Any help is appreciated!

[Added by Edit]
I can successfully launch myApp by the following:
QProcess::startDetached("/usr/bin/open", QStringList() << "path_to_myApp/myApp.app");

Does it have to be like this?
Thanks

[patrik08]

The applications path is different on all OS!

This is a way to find installed MiniScribus http://code.google.com/p/fop-miniscribus/

first get path from appication executable and after run its...

/* find cpl MiniScribus path or exe 
*/
static inline QString getFOPDefaultExeName()
{
	QString exename;
    QString foppath;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate Miniscribus  thanks to the qsetting
     QSettings softs("HKEY_LOCAL_MACHINE\\Software",QSettings::NativeFormat);
     QStringList allsoftware = softs.childGroups();
     QStringList ppkonly = allsoftware.filter(QRegExp("1-PPK-Schweiz"));
         for (int i = 0; i < ppkonly.size(); ++i) {
              const QString RealName = ppkonly.at(i);  /* realpath */
              ///////////qDebug() << "### soft " <<  RealName;
               if (softs.value(RealName+"/FOP MiniScribus/path").toString().size() > 6 ) {
                   foppath = softs.value(RealName+"/FOP MiniScribus/path").toString();
                   foppath.append(softs.value(RealName+"/FOP MiniScribus/Bundlename").toString()+".exe");
                   return foppath;
               }
 
 
         }
 
    /* win not having GPL Ghostscript ! */
    foppath = "";   
    return foppath;
#endif
#if defined Q_WS_MAC
foppath = "/Applications/MiniScribus.app/Contents/MacOS/MiniScribus";
#endif
#if defined Q_WS_X11
foppath = getGSLinuxPath(QString("MiniScribus") );
#endif
return foppath;
/* forum http://www.qtcentre.org/forum/f-qt-programming-2/t-qsettings-read-only-avaiable-10254.html */
}
 
extern inline QString getGSLinuxPath( QString apps = QString("gs") )
{
    QStringList potential_paths;
    potential_paths.append("/usr/local/bin");
    potential_paths.append("/sw/bin");   /* to use on mac as same */
    potential_paths.append("/opt/bin");
    QProcess *process = new QProcess(NULL);
    process->setReadChannelMode(QProcess::MergedChannels);
    QStringList env = process->systemEnvironment();
    env.replaceInStrings(QRegExp("^PATH=(.*)", Qt::CaseInsensitive), "PATH=\\1;"+potential_paths.join(";"));
    process->setEnvironment(env);
 
        process->start( QString("which") ,  QStringList() << apps , QIODevice::ReadOnly );
          if (!process->waitForFinished()) {
          return QString();
          } else {
              QString finder = process->readAll().trimmed();
              if (finder.endsWith(apps,Qt::CaseInsensitive)) {
                 ///////////// qDebug() << "### finder " <<  finder;
                return finder;  
              } else {
                return QString(); 
              }
          }
}

/* find cpl MiniScribus path or exe 
*/
static inline QString getFOPDefaultExeName()
{
	QString exename;
    QString foppath;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate Miniscribus  thanks to the qsetting
     QSettings softs("HKEY_LOCAL_MACHINE\\Software",QSettings::NativeFormat);
     QStringList allsoftware = softs.childGroups();
     QStringList ppkonly = allsoftware.filter(QRegExp("1-PPK-Schweiz"));
         for (int i = 0; i < ppkonly.size(); ++i) {
              const QString RealName = ppkonly.at(i);  /* realpath */
              ///////////qDebug() << "### soft " <<  RealName;
               if (softs.value(RealName+"/FOP MiniScribus/path").toString().size() > 6 ) {
                   foppath = softs.value(RealName+"/FOP MiniScribus/path").toString();
                   foppath.append(softs.value(RealName+"/FOP MiniScribus/Bundlename").toString()+".exe");
                   return foppath;
               }
             
             
         }
    
    /* win not having GPL Ghostscript ! */
    foppath = "";   
    return foppath;
#endif
#if defined Q_WS_MAC
foppath = "/Applications/MiniScribus.app/Contents/MacOS/MiniScribus";
#endif
#if defined Q_WS_X11
foppath = getGSLinuxPath(QString("MiniScribus") );
#endif
return foppath;
/* forum http://www.qtcentre.org/forum/f-qt-programming-2/t-qsettings-read-only-avaiable-10254.html */
}

extern inline QString getGSLinuxPath( QString apps = QString("gs") )
{
    QStringList potential_paths;
    potential_paths.append("/usr/local/bin");
    potential_paths.append("/sw/bin");   /* to use on mac as same */
    potential_paths.append("/opt/bin");
    QProcess *process = new QProcess(NULL);
    process->setReadChannelMode(QProcess::MergedChannels);
    QStringList env = process->systemEnvironment();
    env.replaceInStrings(QRegExp("^PATH=(.*)", Qt::CaseInsensitive), "PATH=\\1;"+potential_paths.join(";"));
    process->setEnvironment(env);
    
        process->start( QString("which") ,  QStringList() << apps , QIODevice::ReadOnly );
          if (!process->waitForFinished()) {
          return QString();
          } else {
              QString finder = process->readAll().trimmed();
              if (finder.endsWith(apps,Qt::CaseInsensitive)) {
                 ///////////// qDebug() << "### finder " <<  finder;
                return finder;  
              } else {
                return QString(); 
              }
          }
}

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and here run appication + params to create a pdf from template...

proc = new QProcess(this);  /* */
connect(proc, SIGNAL(finished(int)),this, SLOT(RegisterPDFstream(int)));
proc->start(Generate_Command());  
 
/* if finished get pdf stream and save on db mysql */
 
 
 
QString Invoice::Generate_Command()
{
 
      if (Current_Faktura.barcode_value.size() < 1) {
        QMessageBox::information(0, tr("File Error"),tr("Unable to read barcode nummer!"));
        return QString();
      }
      Result_fop_file_final = QString("%1/%2_result_code.fop")
                            .arg(FAKTURA_CACHEDIR)
                            .arg(Current_Faktura.barcode_value);
 
      QFile f( Result_fop_file_final );  /* old pdf file */
      if (f.exists()) {
          f.remove();
      }
 
     registro->FillOnFile(FopWorkingActual.absoluteFilePath(),textEdit->toPlainText(),0,Result_fop_file_final);
     QFile f2( PRINTONFILEFAKE );  /* old pdf file */
      if (f2.exists()) {
          f2.remove();
      }
 
 
     QStringList cmd;
     #if defined Q_WS_WIN
     cmd.append("\""+FopAppsFullPath+"\"");
     cmd.append("-pdf");
     cmd.append("\""+PRINTONFILEFAKE+"\"");
     cmd.append("\""+Result_fop_file_final+"\"");
     #else
     cmd.append(FopAppsFullPath);
     cmd.append("-pdf");
     cmd.append(PRINTONFILEFAKE);
     cmd.append(Result_fop_file_final);
     #endif
     QString makepnggreycommand = cmd.join(" ");
     return makepnggreycommand;
}

proc = new QProcess(this);  /* */
connect(proc, SIGNAL(finished(int)),this, SLOT(RegisterPDFstream(int)));
proc->start(Generate_Command());  

/* if finished get pdf stream and save on db mysql */



QString Invoice::Generate_Command()
{
     
      if (Current_Faktura.barcode_value.size() < 1) {
        QMessageBox::information(0, tr("File Error"),tr("Unable to read barcode nummer!"));
        return QString();
      }
      Result_fop_file_final = QString("%1/%2_result_code.fop")
                            .arg(FAKTURA_CACHEDIR)
                            .arg(Current_Faktura.barcode_value);
    
      QFile f( Result_fop_file_final );  /* old pdf file */
      if (f.exists()) {
          f.remove();
      }
    
     registro->FillOnFile(FopWorkingActual.absoluteFilePath(),textEdit->toPlainText(),0,Result_fop_file_final);
     QFile f2( PRINTONFILEFAKE );  /* old pdf file */
      if (f2.exists()) {
          f2.remove();
      }
    
    
     QStringList cmd;
     #if defined Q_WS_WIN
     cmd.append("\""+FopAppsFullPath+"\"");
     cmd.append("-pdf");
     cmd.append("\""+PRINTONFILEFAKE+"\"");
     cmd.append("\""+Result_fop_file_final+"\"");
     #else
     cmd.append(FopAppsFullPath);
     cmd.append("-pdf");
     cmd.append(PRINTONFILEFAKE);
     cmd.append(Result_fop_file_final);
     #endif
     QString makepnggreycommand = cmd.join(" ");
     return makepnggreycommand;
}

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