Question

我尝试使用PyQgis API在Python上加载shapefile但无济于事。我仔细检查了shapefile的路径，发现它是正确的。 QGIS模块似乎也进口得很好。当我在QgsRegistry中检查提供者列表时，它什么都不返回。我可以知道我错过了什么或者应该如何排除故障吗？

我使用的是Ubuntu 12.04，QGIS 2.4.0 Chugiak和Python 2.7.3。提前谢谢！

以下是我的输出和代码：

” /usr/bin/python2.7 /home/victorzhiyulee/IdeaProjects/Delineation/select_dun_calculate_print.py 申请状态： QGIS_PREFIX_PATH env var：
前缀：/ usr / bin / qgis 插件路径：/ usr / bin / qgis / lib / qgis / plugins 包数据路径：/ usr / bin / qgis / share / qgis 活动主题名称：
活动主题路径:: / images / themes // 默认主题路径:: / images / themes / default / SVG搜索路径：/ usr / bin / qgis / share / qgis / svg / 用户数据库路径：/usr/bin/qgis/share/qgis/resources/qgis.db

提供商名单找不到OGR提供商！文件已存在;路径是正确的（'/home/victorzhiyulee/Desktop/dun.shp'，'dun'，'ogr'）图层无法加载！

进程以退出代码0结束 “

__author__ = 'victorzhiyulee'
# Importing QGis API
# Importing OGR & OSR
import os
import sys
import PyQt4.QtCore
import PyQt4.QtGui
import qgis.core
import qgis.gui
from qgis.core import *
from qgis.gui import *
from osgeo import ogr, osr
from PyQt4.QtCore import *

# Supply path to the QGis resources on your PC
# noinspection PyTypeChecker
QgsApplication.setPrefixPath("/usr/bin/qgis", True)
# Load providers
QgsApplication.initQgis()
# Show setting of parameters
print QgsApplication.showSettings()

# Load vector layer
data_source = "/home/victorzhiyulee/Desktop/dun.shp"
layer_name = "dun"
provider_name = "ogr"
fileInfo = QFileInfo(data_source)

print('Provider List')
print(QgsProviderRegistry.instance().providerList())

r = QgsProviderRegistry.instance()
if not 'ogr' in r.providerList():
    print 'Could not find OGR provider!'
else:
    print 'Providers found ok!'
# Add layer to the registry
layer = QgsVectorLayer(data_source, fileInfo.fileName(), provider_name)
QgsMapLayerRegistry.instance().addMapLayer(layer)

if fileInfo.exists():
    print("File exists; Path is correct")
    print(data_source, layer_name, provider_name)
    layer = QgsVectorLayer(data_source, fileInfo.fileName(), provider_name)
    if not layer.isValid():
        print("Layer failed to load!")
    else:
        print("Yes, layer loads successfully")
    features = layer.getFeatures()
else:
    print("Check if your path is correct")
    QgsApplication.exitQgis()
iteration = layer.getFeatures()
for features in iteration:
    # Fetch attributes
    attris = features.attributes()
    print(attris)
QgsApplication.exitQgis()

Answer 1

我认为前缀路径不正确，路径为“/ usr / share / qgis”，因此我的前缀只是“/ usr”。我已经检查了print QgsApplication.showSettings（）输出中的路径来发现它。

在独立Python QGis应用程序中加载Layer / Shapefile时出错

1 个答案: