从类中使用变量到另一个类

Question

我试图从一个类中使用一个变量 - fileImporter

但是我与# AttributeError: 'CustomNodeTranslator' object has no attribute 'camName' #我使用了类似的错误提示 - CustomNodeTranslator，并有该变量在另一个类中使用方法在另外两个类中，除了这两个类外，它正在工作。

难道是因为CustomNodeTranslator是一种特殊情况吗？看到它被用于插件？

请给我建议。

谢谢。

class CustomNodeTranslator(OpenMayaMPx.MPxFileTranslator): 
    def __init__(self): 
     OpenMayaMPx.MPxFileTranslator.__init__(self) 
    ... 
    ... 

    def reader(self, fileObject, optionString, accessMode): 
     try:   
      fullPath = fileObject.fullName() 

      self.fileHandle = open(fullPath,"r") 
      camHandle = self.fileHandle 

      camBaseName = os.path.basename(camHandle.name) 
      camName = os.path.splitext(camBaseName)[0] 
      self.camName = camName 

class fileImporter(): 
    def __init__(self, order): 

     test = CustomNodeTranslator() 

     cameraName, cameraShape = cmds.camera(n=str(test.camName)) 
     camSel.extend((cameraName, cameraShape)) 

     cmds.scale(0.5, 0.5, 0.5) 


     camBaseName = os.path.basename(camHandle.name) 
     camName = os.path.splitext(camBaseName)[0] 
     self.camName = camName 

Answer 1

不创建在__init__方法的类属性，所以当然的--here--

test = CustomNodeTranslator() 
# -- here -- 
cameraName, cameraShape = cmds.camera(n=str(test.camName)) 

它尚不可见。可以在init中分配它，也可以在类接口上放置一个属性引用。 More in the doc.

UPDATE：你应该声明它在CustomNodeTranslator类你已经创建后

class CustomNodeTranslator(OpenMayaMPx.MPxFileTranslator): 
    def __init__(self): 
     self.camName = "" 
     .... 

Answer 2

场只存在。

test = CustomNodeTranslator() 
# at this point test only has fields that are either introduced in 
# the __init__ 
# or in the class body (like methods) 
# calling reader with proper arguments will create the field 

test.reader(fileObject, optionString, accessMode) 
print test.camName