对于大多数开发人员来说,掌握Python这一编程语言其实是比较容易的,虽然其中有很多不同于其他语言的使用方法,但是其应用方便简单的特点使其在开发领域中占据主要地位。在这里我们就可以先从Python数据转换的实现方法来看看这一语言的具体编写方式。
学了几天的Python和FME Objects,发现之间教程里的很多对象已经过时了,而且语法和vb相差比较大,但概念还是一样的,下面写一段Python代码,将这几天学习的对象联系一下,下面的代码功能是读schema feature和data feature,并显示feature的属性和关联的坐标系,并使用FMEDialog对象来设置源和目标,并做格式转换,以下Python数据转换代码经过测试,运行正常。
- import pyfme
- FME_GEOMETRY_TYPE={
- 0:"FME_GEOM_UNDEFINED",
- 1:"FME_GEOM_POINT",
- 2:"FME_GEOM_LINE",
- 4:"FME_GEOM_POLYGON",
- 8:"FME_GEOM_DONUT",
- 256:"FME_GEOM_PIP",
- 512:"FME_GEOM_AGGREGATE",
- }
- session=pyfme.FMESession()
- dialog=session.createDialog()
- pr=dialog.sourcePrompt("","")
- reader=pyfme.FMEReader(pr[0])
- reader.open(pr[1],pr[2])
- pw=dialog.destPrompt("","")
- writer=pyfme.FMEWriter(pw[0])
- writer.open(pw[1],pw[2])
- theend=True
- while theend:
- feature=pyfme.FMEFeature()
- theend=reader.readSchema(feature)
- if theend:
- print "\n------------%s----------" % "Schema Feature Infomation"
- print "Geometry Type: " + str(FME_GEOMETRY_TYPE
[feature.getGeometryType()])- print "Feature Type: " + str(feature.getFeatureType())
- print "CoordinateSystem Name: " + feature.getCoordinateSystem()
- csm=pyfme.FMECoordSysManager()
- csp=csm.getOGCCoordSys(feature.getCoordinateSystem())
- print "CoordinateSystem Information:\n%s\n" % csp
- writer.addSchema(feature)
- theend=True
- while theend:
- feature=pyfme.FMEFeature()
- theend=reader.read(feature)
- if theend:
- print "\n------------%s----------\n" % "Data Feature Infomation"
- print "GeometryType: " + str(FME_GEOMETRY_TYPE
[feature.getGeometryType()])- print "FeatureType: " + str(feature.getFeatureType())
- print "CoordinateSystem: " + feature.getCoordinateSystem()
- print "CoordinateSystem List:\n%s\n" % feature.getCoordinates()
- writer.write(feature)
- reader.close()
- writer.close()
- del reader
- del writer
Python数据转换运行环境 FME DESKTOP 2009 ,pyfme for Python 2.5,Python 2.5
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