QGIS 3 python循环遍历层并运行算法答案

【问题标题】：QGIS 3 python loop through layers and run algorithmQGIS 3 python循环遍历层并运行算法
【发布时间】：2022-03-11 01:41:54
【问题描述】：

我正在尝试遍历层并在每一层上运行处理算法，但输入错误：

代码

feedback = QgsProcessingFeedback()

# Get current layers
layers = QgsProject.instance().mapLayers().values()

# Loop through layer and run algorithm
for layer in layers:
    processing.run("qgis:pointstopath", {'INPUT': layer, 'ORDER_FIELD': 'name', 'GROUP_FIELD': 'name','OUTPUT': layer+'.gpkg'},feedback)

错误

Traceback (most recent call last):
File "C:\OSGEO4~1\apps\Python37\lib\code.py", line 90, in runcode
exec(code, self.locals)
File "<input>", line 2, in <module>
File "C:/OSGEO4~1/apps/qgis-rel- 
dev/./python/plugins\processing\tools\general.py", line 105, in run
return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback,
context)
File "C:/OSGEO4~1/apps/qgis-rel- 
dev/./python/plugins\processing\core\Processing.py", line 183, in 
runAlgorithm
raise QgsProcessingException(msg)
_core.QgsProcessingException: There were errors executing the algorithm.

你如何正确地将输入层从地图解析到算法？

【问题讨论】：

标签： python gis qgis

【解决方案1】：

你不需要使用 'value' 方法。

正确的方法是layers = QgsProject.instance().mapLayers()

完整代码为：

feedback = QgsProcessingFeedback()

# Get current layers
layers = QgsProject.instance().mapLayers()

# Loop through layer and run algorithm
for layer in layers:
    processing.run("qgis:pointstopath", {'INPUT': layer, 'ORDER_FIELD': 'name', 'GROUP_FIELD': 'name','OUTPUT': layer+'.gpkg'},feedback)

【讨论】：