Add dumpSymbol method to DrawViewSymbol based classes

- this is mainly for debugging output from Arch/Draft

src/Mod/TechDraw/App/DrawViewSymbol.cpp

@@ -38,6 +38,8 @@
 #include "DrawPage.h"
 #include "DrawViewSymbol.h"
 
+#include <Mod/TechDraw/App/DrawViewSymbolPy.h>  // generated from DrawViewSymbolPy.xml
+
 using namespace TechDraw;
 using namespace std;
 
@@ -158,7 +160,14 @@ bool DrawViewSymbol::checkFit(TechDraw::DrawPage* p) const
     return result;
 }
 
-
+PyObject *DrawViewSymbol::getPyObject(void)
+{
+    if (PythonObject.is(Py::_None())) {
+        // ref counter is set to 1
+        PythonObject = Py::Object(new DrawViewSymbolPy(this),true);
+    }
+    return Py::new_reference_to(PythonObject);
+}
 
 // Python Drawing feature ---------------------------------------------------------
 

src/Mod/TechDraw/App/DrawViewSymbol.h

@@ -60,6 +60,9 @@ public:
     virtual QRectF getRect() const override;
     virtual bool checkFit(TechDraw::DrawPage* p) const override;
 
+    //return PyObject as DrawViewSymbolPy
+    virtual PyObject *getPyObject(void);
+
 
 protected:
     virtual void onChanged(const App::Property* prop) override;

src/Mod/TechDraw/App/DrawViewSymbolPy.xml

@@ -13,6 +13,11 @@
       <Author Licence="LGPL" Name="WandererFan" EMail="wandererfan@gmail.com" />
       <UserDocu>Feature for creating and manipulating Drawing SVG Symbol Views</UserDocu>
     </Documentation>
+    <Methode Name="dumpSymbol">
+      <Documentation>
+        <UserDocu>dumpSymbol(fileSpec) - dump the contents of Symbol to a file</UserDocu>
+      </Documentation>
+    </Methode>
     <CustomAttributes />
   </PythonExport>
 </GenerateModel>

src/Mod/TechDraw/App/DrawViewSymbolPyImp.cpp

@@ -1,6 +1,10 @@
 
 #include "PreCompiled.h"
 
+#include <Base/Console.h>
+#include <Base/FileInfo.h>
+#include <Base/Stream.h>
+
 #include "DrawViewSymbol.h"
 #include "DrawView.h"
 
@@ -17,6 +21,32 @@ std::string DrawViewSymbolPy::representation(void) const
     return std::string("<DrawViewSymbol object>");
 }
 
+PyObject* DrawViewSymbolPy::dumpSymbol(PyObject *args)
+{
+    const char* fileSpec;
+    if (!PyArg_ParseTuple(args, "s", &fileSpec)) {
+       throw Py::TypeError("** dumpSymbol bad args.");
+    }
+    auto dvs = getDrawViewSymbolPtr();
+    std::string symbolRepr;
+    if (dvs != nullptr) {
+        symbolRepr = dvs->Symbol.getValue();
+    }
+
+    Base::FileInfo fi(fileSpec);
+    std::ofstream outfile;
+    outfile.open(fi.filePath());
+    outfile.write (symbolRepr.c_str(),symbolRepr.size());
+    outfile.close();
+    if (outfile.good()) {
+        outfile.close();
+    } else {
+        std::string error = std::string("Can't write ");
+        error += fileSpec;
+        throw Py::Exception(error);
+    }
+    Py_Return;
+}
 
 PyObject *DrawViewSymbolPy::getCustomAttributes(const char* /*attr*/) const
 {