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I am writing a plugin that offers to open a CSV. I know the local path to the CSV but I don't know if it contains spatial data nor which name the X and Y could have.

The best way I can think of, is to utilize the QGIS Delimited Text Widget and set the path to the file, so it is possible to choose X and Y (if existing) from the native dialog (and use the other functions if needed).

My only problem is, that I can't find a way to set the path to the file inside the widget. Is there a way I can do this?

The code to open the widget:

delimited_dlg = QgsProviderRegistry.instance().selectWidget("delimitedtext", self.main_win)  # use iface.mainWindow() in console

QObject.connect(delimited_dlg, SIGNAL( "addVectorLayer( QString, QString, QString )" ),
           self.main_win, SLOT( "addSelectedVectorLayer( QString, QString, QString )" ) )

delimited_dlg.show()

The native Class QgsDelimitedTextSourceSelect uses the variable txtFilePath to store the path and the Class QgsDelimitedTextProvider takes the const QString& uri as argument. Is there any chance I could set those?

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Not the neatest way of doing things, but you can achieve what you want by running this code into the QGIS Python console:

delimited_dlg = QgsProviderRegistry.instance().selectWidget("delimitedtext", iface.mainWindow())
delimited_dlg.children()[1].children()[2].setText("/path/to/your/csv_file.csv")
delimited_dlg.show()

delimited_dlg is the dialog, which contains children. Second child is a QWidget, which in turns contains some QLabels and QLineEdits, among other widgets. The QLineEdit widget you want is the third widget of the aforementioned QWidget, and we know we can set a QLineEdit using setText(), so we use it.

That's it!

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