How to fix error code code: 0x8001010e when using getSaveFileName

[11hours]

when I debug a very sample code based on qmainwindow as follow

#include "mainwindow.h"
#include <QFileDialog>
#include <QString>
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QString xlsFile = QFileDialog::getSaveFileName(this, QString("111"),
               QString("E:/GoogleDrive/Projects/QT/FRACTURE/test.xlsx"),
               QString("excel(*.xls *.xlsx)"),
               &QString("excel(*.xls *.xlsx)"), QFileDialog::ShowDirsOnly);
}

i get this error
:-1: error: Exception at 0x7fff8c3295fc, code: 0x8001010e: , flags=0x1 (execution cannot be continued) (first chance)

this error will not shows in release and if i change the option as QFileDialog::DontUseNativeDialog.

I found the explanation of code: 0x8001010e as this:
The error 0x8001010E is RPC_E_WRONG_THREAD "The application called an interface that was marshalled for a different thread.".
You are breaking COM apartment rules and you are attempting to use an interface pointer on a thread that does not belong to apartment the pointer is valid for. To pass interface pointer to another apartment use marshaling.

but I still don't know how to fix it.

[ambershark]

@11hours That sounds like a bug. Is your application multi-threaded? If not it's more than likely a Qt bug. What version of Qt are you using?

[joeQ]

@11hours Hi,friend, welcome.

Why did you not use the slot function to open the QFileDialog ?

#include "mainwindow.h"

#include <QFileDialog>
#include <QString>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
QPushButton *btn = new QPushButton("save file");
connect(btn,&QPushButton::clicked,this,&MainWindows::SaveFile);
}

void MainWindow::SaveFile()
{
    QString xlsFile = QFileDialog::getSaveFileName(this, QString("111"),
               QString("E:/GoogleDrive/Projects/QT/FRACTURE/test.xlsx"),
               QString("excel(*.xls *.xlsx)"),
               &QString("excel(*.xls *.xlsx)"), QFileDialog::ShowDirsOnly);

}

[jsulm]

@11hours I'm not sure it is save to do this in the constructor as you pass this pointer to getSaveFileName at the time MainWindow is being constructed. You should try to do it like @joeQ suggested.
Why at all do this in a constructor?

[11hours]

@ambershark thanks for your reply!
my system is windows 8.1 64bit, QT version is Based on Qt 5.8.0 (MSVC 2015, 32 bit).
i'm sure that my application is not multi-threaded, i just put my code of getSaveFileName into the codes generated by QT automatically.

[11hours]

@joeQ @jsulm thank you my friends for your reply,.
I did use getSaveFileName in a slot.
I put it in the constructor of MainWindow just because I wanna post a shorter issue here.
anyway, i tried different ways, but got the same error.

[joeQ]

@11hours

post a shorter issue here

What issue and error ?

is using slot-signal havs error ?

[11hours]

@joeQ Sorry my English is so poor. I mean I wanna make a short post.
and yes, i got same error code of 0x8001010e by using slot-signal.

[joeQ]

@11hours

Can you copy below code in slot function to test the error?

  QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),"",tr("Images (*.png *.xpm *.jpg)"));
qDebug()<< fileName

[joeQ]

@11hours Hi, friend,

void MainWindow::SaveFile()
{
    QString xlsFile = QFileDialog::getSaveFileName(this, QString("111"),
               QString("E:/GoogleDrive/Projects/QT/FRACTURE/test.xlsx"),
               QString("excel(*.xls *.xlsx)"),
               &QString("excel(*.xls *.xlsx)"), QFileDialog::ShowDirsOnly); ///< why you used the & ???

}

[joeQ]

@11hours

Hi, friend, i am so worry not to watch you code careful. the below code is ok in my Mac OS.

I think you used wrong about selectedFilter.

#include "widget.h"
#include <QFileDialog>
#include <QTimer>
#include <QDebug>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    QTimer::singleShot(1000,this,&Widget::StSaveFile);
}

Widget::~Widget()
{

}

void Widget::StSaveFile()
{
    QString filter = QString("excel(*.xls *.xlsx)");
    QString selFile = QFileDialog::getSaveFileName(this,
                                                   QString("111"),
                                                   QString("E:/GoogleDrive/Projects/QT/FRACTURE/test.xlsx"),
                                                   QString("excel(*.xls *.xlsx)"),
                                                   &filter, QFileDialog::ShowDirsOnly);
    qDebug() << selFile;
}

[11hours]

@joeQ the code can get the correct file name.
qDebug output the selFile : "E:/GoogleDrive/Projects/QT/FRACTURE/test.xlsx".
but the it still throw the error code.

[joeQ]

@11hours ok, let's test again.

test the below code.

QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),"",tr("Images (*.png *.xpm *.jpg)"));
qDebug()<< fileName

[11hours]

@joeQ it is still the same

[11hours]

@joeQ I think it is because the method QT uses to call WINDOWS native dialog is not safe, so WINDOWS throw the error, right?

[joeQ]

@11hours

From these test, i am sure this error is not your fault.

did you used DontUseNativeDialog option, you can test it.

QFileDialog::DontUseNativeDialog

Do not use the native file dialog. By default, the native file dialog is used unless you use a subclass of QFileDialog that contains the Q_OBJECT macro, or the platform does not have a native dialog of the type that you require.

test code snippet

QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),"",tr("Images (*.png *.xpm *.jpg)"),0,QFileDialog::DontUseNativeDialog);
qDebug()<< fileName
``

[11hours]

@joeQ yes, like I said before, if i use DontUseNativeDialog, there will be no error reported.

[joeQ]

@11hours

From this, I think i got into problem same with you before. ok, you can use one macro in your program, use the windows native file dialog under release version, not use native file dialog under debug version.

void MainWindow::StOpenFile()
{
    /** ... */
#ifdef DONT_USE_NATIVE_DIALOG
    QStringList ltFilePath = QFileDialog::getOpenFileNames(this,
                                                           tr("Open files"),
                                                           defaultDir,
                                                           QString(STR_OPEN_FILE),
                                                           0,
                                                           QFileDialog::DontUseNativeDialog);
#else
    QStringList ltFilePath = QFileDialog::getOpenFileNames(this,
                                                           tr("Open files"),
                                                           defaultDir,
                                                           QString(STR_OPEN_FILE));
#endif

/** ... */
}

[jsulm]

@joeQ Would be good to file a bug for this issue

[joeQ]

@jsulm oh, my honor. but how to file a bug to qt team?