how to open a file in my qt app via double clicking on it

[_-mohamed-_]

@eyllanesc oh,
I thought it was likeQCoreApplication::arguments()

I need the second argument which is the path of the file I want to open

[eyllanesc]

@_-mohamed-_ If you want to pass arguments using Qt Creator then click on the "Projects" on the left side and press the "Run" button, then put the arguments in "Command Line Arguments"

[_-mohamed-_]

@eyllanesc oh thanks this information will help me and save my time.

I tried to get the argument using QCommandLineParser, I got the same result
(C:\Users\moham\OneDrive\Desktop\????.txt)

note: when I open the same file using windows notepad it workes fine.

this is main.cpp:

#include "mainwindow.h"
#include <QApplication>
#include <QDebug>
using namespace std;

int main(int argc, char *argv[])
{    
    QApplication a(argc, argv);

    QCommandLineParser parser;
    parser.process(a);

    QStringList args = parser.positionalArguments();

    MainWindow w;
    w.settext(args.at(0));

    w.show();
    return a.exec();
}

and this is settext() function from mainwindow.cpp:

void MainWindow::settext(QString URL)
{
    QStringList arguments = QCoreApplication::arguments();
    if(arguments.count() > 1)
    {

        QFile file(URL);

        if(!file.open(QFile::ReadOnly | QFile::Text))
            QMessageBox::information(this, "can't open file", "can't open the specified file");

        else
        {
            QTextStream text(&file);
            text.setCodec("UTF-8");
            QString fileContents = text.readAll();
            ui->TextEdit->setPlainText(fileContents);
            file.close();

            edited = false;
            url = URL;
            changeTitle();
        }
    }
}

when i double click the text file i got error(QMessageBox::information(this, "can't open file", "can't open the specified file");)

[JonB]

@_-mohamed-_
So why not debug out URL and the file path from QFile file for yourself? Do you mean that filename really has ???? in it??

[_-mohamed-_]

@JonB no the real file name is "عربي.txt" but i can't get the real name from app's argument

[JonB]

@_-mohamed-_
Look at file.errorString() when the file.open() fails. And print out URL and file.fileName().

[_-mohamed-_]

@JonB i printed the URL and i got (C:\Users\moham\OneDrive\Desktop????.txt) as i said in the previous post
So file.open () can't open a strange text (????.txt)

[Christian Ehrlicher]

@_-mohamed-_ said in how to open a file in my qt app via double clicking on it:

i printed the URL and i got (C:\Users\moham\OneDrive\Desktop????.txt) as i said in the previous post

You must not print non-ascii characters on a windows console - windows is too stupid for this. You QMessageBox or similar.

[_-mohamed-_]

@Christian-Ehrlicher I have set the text in QTextEdit using ui->TextEdit->setPlainText (URL)

[JonB]

@_-mohamed-_
I said:

Look at file.errorString() when the file.open() fails.

[_-mohamed-_]

@JonB why? I said that file.open() fail because the path is incorrect

ok now I tried file.errorString() and it returns The filename, directory name, or volume label syntax is incorrect.

[_-mohamed-_]

I tried to open the same file with all text editors on my computer like (notepad++, VScode, Pycharm, Qt creator...) And they all opened the file successfully, is the problem in Qt?

[_-mohamed-_]

I got a new problem when i override dropEvent function in QTextEdit
I used event->mimedata()->urls->at (0) to get the url of the droped file

But i got the same problem which is in arabic letters files name i got questions marks instade of the real file name(?????)

[JonB]

@_-mohamed-_
How do you know that? @Christian-Ehrlicher wrote earlier

You must not print non-ascii characters on a windows console - windows is too stupid for this. You QMessageBox or similar.

Did you act on that? It is not clear to me how you are outputting this string, have you looked at it on a QMessageBox or a QLabel, or have you used the debugger to check what the actual bytes are in the string?

[_-mohamed-_]

@JonB
Oh it's my fault this time, I used qDebug() to see the output, Sorry
now I used QMessageBox and it works(i mean dropEvent() function)

Thanks for your alert!

[_-mohamed-_]

I found a solution to this problem
the URL is coming from the system, so the problem with the system

I fixed that problem by enabling UTF-8 for windows by following these steps:

• Open Control Panel
• Click on Clock and Region
• Click on Region
• Go to Administrative tab
• Click on Change system locale...
• Click on Beta: Use Unicode UTF-8 for worldwide language support check box.
• Then when you restart your computer the problem will disappear :)

if you have any other solution please tell me