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  1. 7th December 2021, 20:46 #1
    jcbaraza
    jcbaraza is offline Novice
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    Default Strange compilation errors when using "invokeMethod"

    Hi,

    I'm renewing an old application by "threading" it. The idea is to deliver a (high) number of simulation tasks to the threads that the computer may have. After reading a lot about threading, I've used a QThreadPool in a "server" class to deliver the tasks. These tasks are implemented in a so-called "client" class. I also want to have information about the evolution of the thread operation, so the "server" class has a GUI where I show information about it, such as the status of the tasks (pending/in progress/completed), a progress bar, etc.

    I've implemented the reporting from the threaded tasks through "invokeMethod", invoking in the "client" class two slots from the "server" class, in a similar way to the example in https://www.walletfox.com/course/qrunnableexample.php.

    However, I'm getting some strange compiler errors:

    * In the two invokeMethod calls ("no matching function for call to 'QMetaObject::invokeMethod(QWidget*&, ...").
    * In "qobjectdefs.h" file ("no type named 'type' in struct std::enable_if<false, bool>'").
    * In the moc file of the client's cpp file!!!

    Probably all may be due to the same error (or errors), but I'm not able to catch. I want to remark that, although I comment the invokeMethod calls, the other errors persist...

    In other posts I've seen that you suggested to delete the moc and ui files, the makefiles, etc. So, I've deleted completely the build folder, and recompiled the project as new. But the errors in the moc file do appear again.

    Any idea? I enclose the h and cpp files for the "client" and "server" classes (although simplifying some irrelevant functions) in case they may help. If you consider necessary to upload all the application, please don't hesitate to ask, and I'll do.

    Thanks!

    Server.h

    Qt Code: 
    1. #ifndef SERVERMTH_H
    2. #define SERVERMTH_H
    3.  
    4. #include <QFile>
    5. #include <QFileInfo>
    6. #include <QDialog>
    7. #include <QMessageBox>
    8. #include <QProcess>
    9. #include <QProgressDialog>
    10. #include <QString>
    11. #include <QStringList>
    12. #include <QThreadPool>
    13. #include <QElapsedTimer>
    14. #include "BasicDeclarations.h"
    15. #include "ClientRunnable.h"
    16.  
    17. namespace Ui {
    18. class ServerMTh;
    19. }
    20.  
    21. class ServerMTh : public QDialog
    22. {
    23.     Q_OBJECT
    24.  
    25. public:
    26.     explicit ServerMTh(QWidget *parent = nullptr, QString designpath = "", QString design = "",
    27.                        int nbr_injections = 0, QStringList *macro_list = nullptr,
    28.                        QStringList *trace_list = nullptr);
    29.     ~ServerMTh();
    30.  
    31. private slots:
    32.     void confirmAbort();
    33.     void ClientStarted(int id_client);
    34.     void ClientTerminated(int id_client, int client_status);
    35.  
    36. private:
    37.     enum
    38.     {
    39.         INJECTIONNUMBER, INJECTIONSTATUS
    40.     };
    41.     #define SimulationPending       0
    42.     #define SimulationInProgress    1
    43.     #define SimulationTerminated    2
    44.     #define SimulationError         3
    45.  
    46.     Ui::ServerMTh *ui;
    47.     bool ForceAbort;
    48.     bool Disconnecting;
    49.     int return_value;
    50.     int NbrInjections, i_progress;
    51.     int maxOperativeThreads, InjectingThreads;
    52.     int TotalSimulations, SimulationsFinished, SimulationsInProgress;
    53.     int *InjectionStatus;
    54.     QString Design_Path, Design;
    55.     QStringList *macroList, *traceList;
    56.     QThreadPool *ThreadPool;
    57.     QList<int> ErrorClients;
    58.     QElapsedTimer *timerStart, *timerStartSimulation;
    59.     qint64 EndOperationTime, EndSimulationTime;
    60.  
    61.     void reject();
    62.     QString FormatTime(const qint64 time);
    63.     int WriteTimeReport(QString fich);
    64. };
    65.  
    66. #endif // SERVERMTH_H
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    The two slots that should be invoked by the client are ClientStarted(int id_client) and ClientTerminated(int id_client, int client_status).

    Server.cpp
    Qt Code: 
    1. #include <QDir>
    2. #include <QTextStream>
    3. #include "ServerMTh.h"
    4. #include "ui_ServerMTh.h"
    5.  
    6.  
    7. ServerMTh::ServerMTh(QWidget *parent, QString designpath, QString design, int nbr_injections, QStringList *macro_list, QStringList *trace_list) :
    8.     QDialog(parent),
    9.     ui(new Ui::ServerMTh)
    10. {
    11.     ui->setupUi(this);
    12.  
    13.     //  GUI and other elements setup
    14.  
    15.     //  2. Create runnables and launch to threads
    16.     for (int i_injection = 0; (i_injection < TotalSimulations); i_injection++)
    17.     {
    18.         ClientRunnable *Client = new ClientRunnable(this);//  The idea is that the client knows the "owner" of ths slots to invoke
    19.         Client->ID = i_injection;
    20.         Client->Design = Design;
    21.         Client->MacroFile = macroList->at(i_injection);
    22.         ThreadPool->start(Client);
    23.     }
    24. }
    25.  
    26. ServerMTh::~ServerMTh()
    27. {
    28. }
    29.  
    30. void ServerMTh::confirmAbort()
    31. {
    32.     ui->progressCancel->setEnabled(false);
    33.     QString msg = "Abort injection. Are you sure?";
    34.     QMessageBox msgBox(this);
    35.     msgBox.setIcon(QMessageBox::Question);
    36.     msgBox.setText(msg);
    37.     msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
    38.     msgBox.setDefaultButton(QMessageBox::No);
    39.     if (msgBox.exec() == QMessageBox::Yes)
    40.     {
    41.         ui->progressInfo->setText("Please wait until injections in progress end...");
    42.         qApp->processEvents();
    43.  
    44.         ThreadPool->clear();
    45.         ThreadPool->waitForDone(-1);
    46.         Disconnecting = true;
    47.         done(-1);
    48.     }
    49.     else
    50.         ui->progressCancel->setEnabled(true);
    51.  
    52.     qApp->processEvents();
    53. }
    54.  
    55. void ServerMTh::ClientStarted(int id_client)
    56. {
    57.     //  Update GUI
    58. }
    59.  
    60. void ServerMTh::ClientTerminated(int id_client, int client_status)
    61. {
    62.  
    63.     //  Check Modelsim start status
    64.     if (client_status == ClientRunnable::KOCLIENTSTART)
    65.     {
    66.         if (ErrorClients.contains(id_client))
    67.         {
    68.  
    69.             //  Same simulation has produced two errors => Terminate
    70.             ThreadPool->clear();
    71.             ThreadPool->waitForDone(-1);
    72.             Disconnecting = true;
    73.             done(-1);
    74.         }
    75.         else
    76.         {
    77.  
    78.             //  Add the task to the pool
    79.             ClientRunnable *Client = new ClientRunnable;
    80.             Client->ID = id_client;
    81.             Client->Design = Design;
    82.             Client->MacroFile = macroList->at(id_client);
    83.             ThreadPool->start(Client);
    84.         }
    85.     }
    86.     else
    87.     {
    88.         if (ErrorClients.contains(id_client))
    89.         {
    90.  
    91.             //  Remove erroneous simulation from the list
    92.             ErrorClients.removeAt(ErrorClients.indexOf(id_client));
    93.         }
    94.  
    95.         //  Update GUI
    96.  
    97.         if ((TotalSimulations - (SimulationsFinished + SimulationsInProgress)) == 0)
    98.         {
    99.             ThreadPool->waitForDone(-1);
    100.             Disconnecting = true;
    101.             done(0);
    102.         }
    103.     }
    104. }
    105.  
    106. void ServerMTh::reject()
    107. {
    108.     if (!Disconnecting)
    109.         confirmAbort();
    110. }
    111.  
    112. QString ServerMTh::FormatTime(const qint64 time)
    113. {
    114.     return QString("%1:%2:%3").arg((time / 3600000), 2, 10, QChar('0')).arg(((time / 60000) % 60), 2, 10, QChar('0')).arg(((time / 1000) % 60), 2, 10, QChar('0'));
    115. }
    116.  
    117. int ServerMTh::WriteTimeReport(QString fich)
    118. {
    119.     return 0;
    120. }
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    Client.h
    Qt Code: 
    1. #ifndef CLIENT_RUNNABLE_H
    2. #define CLIENT_RUNNABLE_H
    3.  
    4. #include <QObject>
    5. #include <QProcess>
    6. #include <QRunnable>
    7. #include <QString>
    8.  
    9. class ClientRunnable : public QRunnable
    10. {
    11.     Q_OBJECT
    12.  
    13. public:
    14.     enum
    15.     {
    16.         OKCLIENTSTART, KOCLIENTSTART
    17.     };
    18.  
    19.     ClientRunnable(QWidget *parent = nullptr);
    20.     int ID;
    21.     QString MacroFile, Design;
    22.  
    23. private:
    24.     QWidget *Parent;
    25.     QString LogFile, TraceFile;
    26.     int Status;
    27.     QProcess *proc;
    28.  
    29.     int CheckLog();
    30.     int FindTrace();
    31.     int CleanTrace();
    32.  
    33. protected:
    34.     void run();
    35. };
    36.  
    37. #endif // CLIENT_RUNNABLE_H
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    Client.cpp

    Qt Code: 
    1. #include <QArgument>
    2. #include <QDebug>
    3. #include <QDir>
    4. #include <QFile>
    5. #include <QMetaObject>
    6. #include <QStringList>
    7. #include "ClientRunnable.h"
    8.  
    9. ClientRunnable::ClientRunnable(QWidget *parent)
    10. {
    11.     Parent = parent;
    12.     Status = OKCLIENTSTART;
    13. }
    14.  
    15. void ClientRunnable::run()
    16. {
    17.     //  Compìler error HERE:
    18.     QMetaObject::invokeMethod(Parent, "ClientStarted", Qt::QueuedConnection, Q_ARG(int, ID));
    19.     //  Note that "Parent" is the server, that is, the owner of the slot invoked
    20.  
    21.     //  1. Create process and run
    23.     pars << ...;
    24.     proc = new QProcess;
    25.     if (proc->execute("vsim.exe", pars) < 0)
    26.         Status = KOCLIENTSTART;
    27.  
    28.     //  2. Check log file
    29.     if (Status == OKCLIENTSTART)
    30.     {
    31.         if (CheckLog() < 0)
    32.             Status = KOCLIENTSTART;
    33.     }
    34.  
    35.     //  3. Compress trace file
    36.     if (Status == OKCLIENTSTART)
    37.     {
    38.         if (FindTrace() < 0)
    39.             Status = KOCLIENTSTART;
    40.  
    41.         if (Status == OKCLIENTSTART)
    42.         {
    43.             if (TraceFile != "")
    44.             {
    45.                 if (CleanTrace() < 0)
    46.                     Status = KOCLIENTSTART;
    47.             }
    48.             else
    49.                 Status = KOCLIENTSTART;
    50.         }
    51.     }
    52.  
    53.     //  Compìler error HERE too:
    54.     QMetaObject::invokeMethod(Parent, "ClientTerminated", Qt::QueuedConnection, Q_ARG(int, ID), Q_ARG(int, Status));
    55.  
    56.     if (Status == OKCLIENTSTART)
    57.         exit(0);
    58.     else
    59.         exit(-1);
    60. }
    61.  
    62. int ClientRunnable::CheckLog()
    63. {
    64.     return 0;
    65. }
    66.  
    67. int ClientRunnable::FindTrace()
    68. {
    69.     return 0;
    70. }
    71.  
    72. int ClientRunnable::CleanTrace()
    73. {
    74.     return 0;
    75. }
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    Last edited by jcbaraza; 7th December 2021 at 21:44.
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