What is the corresponding dbus type for `uint32` and `Vardict` in Qt?

jarusll

I am not able to connect to a Response signal for Dbus
result = connection.connect(desktopObjPath, requestObjPath, requestInterface, "Response", self, SLOT("screenshotUri(uint32, QVariantMap)"))

confirmed by the return value of result being False.

I believe it might be due to the type mismatch between the slot binding screenshotUri(uint32, QVariantMap)
and the slot definition

@Slot(int, dict)
    def screenshotUri(self, integer, dictionary):

How can I know the root cause of the issue?
If it is the slot signature? What are the corresponding types for Response(uint32, vardict)

from PySide6.QtGui import QGuiApplication, QClipboard
from PySide6.QtCore import QObject, Property, Signal, Slot, SLOT
from PySide6.QtQml import QQmlApplicationEngine, QmlElement
from PySide6.QtDBus import QDBusInterface, QDBusConnection, QDBusMessage, QDBusReply, QDBusObjectPath
import sys
import requests

connection = QDBusConnection.sessionBus()

portalService = "org.freedesktop.portal.Desktop"
desktopObjPath = "/org/freedesktop/portal/desktop"
openURIInterface = "org.freedesktop.portal.OpenURI"
screenShotInterface = "org.freedesktop.portal.Screenshot"
requestInterface = "org.freedesktop.portal.Request"
dbusInterface = QDBusInterface(portalService, desktopObjPath, screenShotInterface, connection)

method = "Screenshot"
QML_IMPORT_NAME = "com.jarusll.Popup"
QML_IMPORT_MAJOR_VERSION = 1

@QmlElement
class Popup(QObject):
    inputChanged = Signal(str)
    visibleChanged = Signal(bool)

    def __init__(self, parent=None):
        super().__init__(parent)
        self._context = ""
        self._prompt = ""
        self._loading = False
        self._visible = True

        vars = {
            "handle_token": "handle_token",
            "interactive": True
        }
        dbusInterface.callWithCallback(method, ["parent_window", vars], self, SLOT("handleScreenshot(QDBusObjectPath)"))

    @Slot(QDBusObjectPath)
    def handleScreenshot(self, reply):
        print(reply)
        requestObjPath = reply.path()
        result = connection.connect(desktopObjPath, requestObjPath, requestInterface, "Response", self, SLOT("screenshotUri(uint32, QVariantMap)"))
        print("Result", result)

    @Slot(int, dict)
    def screenshotUri(self, integer, dictionary):
        print("Response: ", integer, dictionary)