我有一個使用設(shè)置的 QML 應(yīng)用程序。所以我創(chuàng)建了一個 python 槽來讀取settings.toml, 并返回值。我已經(jīng)正確設(shè)置了上下文屬性，并且可以毫無問題地調(diào)用其他函數(shù)，而無需從 QML 獲取返回值。...class Settings(QObject) @pyqtSlot(str, str) def getSettings(self, category, key): try: with open("settings.toml", "r") as settings: toml_object = toml.load(settings) return str(toml_object[category][key]) except FileNotFoundError: self.settingsFileNotFound.emit() except toml.TomlDecodeError: self.settingsError.emit() except BaseException: self.fatalError.emit()...tomlsettings.看起來像這樣。...[last-used-font-settings]font = "Arial"... 從 python 打印函數(shù)時，它按預(yù)期工作。...print(Settings.getSettings("last-used-font-settings", "font")) # Returns Arial...但是當(dāng)從 qml 登錄時：... Component.onCompleted: console.log(Settings.getSettings("last-used-font-settings", "font"))/* Returns qml: undefined */...如何解決這個問題？我不太擅長創(chuàng)建 @pyqtProperty，但如果我設(shè)法創(chuàng)建一個，我絕對不想為每個值創(chuàng)建一個屬性！你看，信號不能用于此目的。:(
1 回答
呼如林
TA貢獻1798條經(jīng)驗 獲得超3個贊
如果你想從 python 返回一個值，那么你必須在 pyqtSlot 中使用“result”：
import os
from PyQt5.QtCore import pyqtProperty, pyqtSlot, QObject, QUrl
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
import toml
CURRENT_DIR = os.path.dirname(os.path.realpath(__file__))
class Settings(QObject):
def __init__(self, parent=None):
super().__init__(parent)
self._error_string = ""
@pyqtProperty(str, constant=True)
def errorString(self):
return self._error_string
@pyqtSlot(result=bool)
def hasError(self):
return bool(self.errorString)
@pyqtSlot(str, str, result=str)
def getSettings(self, category, key):
self._error_string = ""
error_string = ""
value = ""
try:
with open(os.path.join(CURRENT_DIR, "settings.toml"), "r") as settings:
toml_object = toml.load(settings)
value = str(toml_object[category][key])
except FileNotFoundError:
error_string = "FileNotFoundError"
except toml.TomlDecodeError:
error_string = "TomlDecodeError"
except Exception as e:
error_string = str(e)
self._error_string = error_string
return value
if __name__ == "__main__":
import sys
app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()
settings = Settings()
engine.rootContext().setContextProperty("Settings", settings)
filename = os.path.join(CURRENT_DIR, "main.qml")
engine.load(QUrl.fromLocalFile(filename))
if not engine.rootObjects():
sys.exit(-1)
sys.exit(app.exec())
import QtQuick 2.12
import QtQuick.Controls 2.12
ApplicationWindow {
visible: true
width: 640
height: 480
Component.onCompleted: {
var value = Settings.getSettings("last-used-font-settings", "font")
if(Settings.hasError()){
console.error(Settings.errorString)
}
else{
console.log(value)
}
}
}
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