XSDRAW::Session() is a function from Draw Harness plugin TKXSDRAW. As long as you are not developing another Draw Harness plugin, it doesn't make sense calling this property - it is initialized only while loading plugin in Draw Harness.
Archived discussion
STEPControl_Reader aReader(XSDRAW::Session()) Error
Reading from STEP
Load a STEP file
Before performing any other operation, you must load a STEP file with:
STEPCAFControl_Reader reader(XSDRAW::Session(), Standard_False);
IFSelect_ReturnStatus stat = reader.ReadFile("filename.stp");
Loading the file only memorizes the data, it does not translate it.
Error
Discussion
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Hi~~~~~Thanks!!!!