from qgis.core import *
from qgis.gui import *
from qgis.PyQt.QtGui import (QColor)

# QgsApplication.setPrefixPath("e:/", True)

qgs = QgsApplication([], True)
qgs.initQgis()


# 创建实例
project = QgsProject.instance()
project.read(r'E:/data/1.Natural_Earth/Test.qgz')
print("FileName: " + project.fileName())

# canvas = QgsMapCanvas()
# canvas.show()
# bridge = QgsLayerTreeMapCanvasBridge(QgsProject.instance().layerTreeRoot(), canvas)

layers_list = {}
for layer in project.mapLayers().values():
    layers_list[layer.name()] = layer
print(layers_list)

openStreetMapLayer = project.mapLayersByName("OpenStreetMap")[0]
print(openStreetMapLayer)

root = project.layerTreeRoot()
print(root.findLayerIds()[0])

# 保存，另存为
# project.write()
# project.write("E:/new_qgis_project.qgz")

# qgs.exitQgis()