fix: GetCSX returns an empty list when structure is read from xml using openEMS ReadFromXML API.

This patch fixes GetCSX API to return the created object

Author: MohamoudAli12

openems.cpp

@@ -1125,6 +1125,11 @@ void openEMS::SetCSX(ContinuousStructure* csx)
 	m_CSX = csx;
 }
 
+ContinuousStructure* openEMS::GetCSX() const
+{
+    return m_CSX;
+}
+
 int openEMS::SetupFDTD()
 {
 	timeval startTime;

openems.h

@@ -115,6 +115,7 @@ class OPENEMS_EXPORT openEMS
 	Excitation* InitExcitation();
 
 	void SetCSX(ContinuousStructure* csx);
+  ContinuousStructure* GetCSX() const;
 
 	Engine_Interface_FDTD* NewEngineInterface(int multigridlevel = 0);
 

python/openEMS/openEMS.pxd

@@ -29,6 +29,7 @@ cdef extern from "openEMS/openems.h":
 
         void SetNumberOfTimeSteps(unsigned int val)
         void SetCSX(_ContinuousStructure* csx)
+        _ContinuousStructure* GetCSX()
 
         void SetEndCriteria(double val)
         void SetOverSampling(int val)

python/openEMS/openEMS.pyx

@@ -428,6 +428,17 @@ cdef class openEMS:
         self.thisptr.SetCSX(CSX.thisptr)
 
     def GetCSX(self):
+        cdef _ContinuousStructure* ptr = self.thisptr.GetCSX()
+        cdef ContinuousStructure csx  # declare here
+
+        if ptr == NULL:
+            self.__CSX = None
+            return None
+
+        if self.__CSX is None or self.__CSX.thisptr != ptr:
+            csx = ContinuousStructure.__new__(ContinuousStructure)
+            csx.thisptr = ptr
+            self.__CSX = csx
         return self.__CSX
 
     def AddEdges2Grid(self, dirs, primitives=None, properties=None, **kw):