function exchange "Function that communicates with Python" input String moduleName "Name of the python module that contains the function"; input String functionName=moduleName "Name of the python function"; input Real dblWri[max(1, nDblWri)] "Double values to write"; input Integer intWri[max(1, nIntWri)] "Integer values to write"; input String strWri[max(1, nStrWri)] "String values to write"; input Integer nDblWri(min=0) "Number of double values to write"; input Integer nDblRea(min=0) "Number of double values to read"; input Integer nIntWri(min=0) "Number of integer values to write"; input Integer nIntRea(min=0) "Number of integer values to read"; input Integer nStrWri(min=0) "Number of strings to write"; // input Integer nStrRea(min=0) "Number of strings to read"; // input Integer strLenRea(min=0) // "Maximum length of each string that is read. If exceeded, the simulation stops with an error"; output Real dblRea[max(1, nDblRea)] "Double values returned by Python"; output Integer intRea[max(1, nIntRea)] "Integer values returned by Python"; protected String pytPat "Value of PYTHONPATH environment variable"; String pytPatBuildings "PYTHONPATH of Buildings library"; Boolean havePytPat "true if PYTHONPATH is already set by the user"; //-- String filNam = "file://Utilities/IO/Python27/UsersGuide/package.mo" //-- "Name to a file of the Buildings library"; algorithm // Get the directory to Buildings/Resources/Python-Sources //-- The lines below do not work in Dymola 2014 due to an issue with the loadResource //-- (ticket #15168). This will be fixed in future versions. //-- pytPatBuildings := Buildings.BoundaryConditions.WeatherData.BaseClasses.getAbsolutePath(uri=filNam); //-- pytPatBuildings := Modelica.Utilities.Strings.replace( //-- string=pytPatBuildings, //-- searchString=filNam, //-- replaceString="Resources/Python-Sources"); // The next line is a temporary fix for the above problem pytPatBuildings := "Resources/Python-Sources"; // Update the PYTHONPATH variable (pytPat, havePytPat) :=Modelica.Utilities.System.getEnvironmentVariable("PYTHONPATH"); if havePytPat then Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPat + ":" + pytPatBuildings); else Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPatBuildings); end if; // Call the exchange function (dblRea, intRea) :=BaseClasses.exchange( moduleName=moduleName, functionName=functionName, dblWri=dblWri, intWri=intWri, strWri=strWri, nDblWri=nDblWri, nDblRea=nDblRea, nIntWri=nIntWri, nIntRea=nIntRea, nStrWri=nStrWri); // Change the PYTHONPATH back to what it was so that the function has no // side effects. if havePytPat then Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPat); else Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=""); end if; end exchange;