This seems to come up semi-regularly from a web search, but I have been unable to converge on a solution. I am using Python 3.8 and pythonnet to try to control a Newport ESP301 motion controller. The supplied .NET assembly contains this command:
public int SR_Get(int axisNumber, out double limit, out string errstring) { errstring = string.Empty; limit = double.MinValue; string text = string.Format("{0}{1}", axisNumber.ToString(), "SR"); string text2 = text + "?"; string empty = string.Empty; StringBuilder sbBuffer = new StringBuilder(); int num = m_COM.Query(text2, ref sbBuffer); empty = sbBuffer.ToString(); empty = empty.Trim(); errstring = checkReturnCodeAndResponse(text2, num, empty); if (num == 0 && string.IsNullOrEmpty(errstring)) { decodeDoubleFromResponse(text, empty, out limit); } if (!string.IsNullOrEmpty(errstring)) { return -1; } return 0; } I am unable to get this command to run successfully using Pythonnet. Here is my code: import sys print("Adding location of Newport.ESP301.CommandInterface.dll to sys.path") sys.path.append(r'C:\Windows\Microsoft.NET\assembly\GAC_64\Newport.ESP301.CommandInterface\v4.0_2.0.0.3__9f994642f5b48132') import clr clr.AddReference("Newport.ESP301.CommandInterface") from CommandInterfaceESP301 import * import System #===================================================================== # Instrument Initialization instrument="COM3" BAUDRATE = 921600 print('Instrument Key=>', instrument) # create an ESP301 instance ESP301Device = ESP301() # Open communication ret = ESP301Device.OpenInstrument(instrument, BAUDRATE); if ret == 0: print("Instrument successfully opened!") else: print("Error!") # Get positive software limit result, response, errString = ESP301Device.SR_Get(1) if result == 0: print('positive software limit=>', response) else: print('Error=>', errString) If I try to execute this code, I get the following error: ====== RESTART: C:\Users\Laser\Documents\Python Programs\esp301_python.py ====== Adding location of Newport.ESP301.CommandInterface.dll to sys.path Instrument Key=> COM3 Instrument successfully opened! Traceback (most recent call last): File "C:\Users\Laser\Documents\Python Programs\esp301_python.py", line 57, in <module> result, response, errString = ESP301Device.SR_Get(1) TypeError: No method matches given arguments for SR_Get: (<class 'int'>) I thought this was originally a problem with int64 vs. int32 but I have tried several methods for converting between these and all give the same error. FWIW, I have no trouble getting this to work in Matlab: clear % Add Assembly NET.addAssembly('C:\Windows\Microsoft.NET\assembly\GAC_64\Newport.ESP301.CommandInterface\v4.0_2.0.0.3__9f994642f5b48132\Newport.ESP301.CommandInterface.dll'); % load modules import CommandInterfaceESP301.*; cport = "COM3"; BAUDRATE = 921600; ESP301Device = ESP301(); % open communication ret = ESP301Device.OpenInstrument(cport, BAUDRATE); if ret == 0 disp("Intrument open!") else disp("Error!") end % Get negative software limit [result, response, errString] = ESP301Device.SR_Get(1); I'm completely stumped and frustrated at this point. Any constructive feedback would be very appreciated! Matt _______________________________________________ PythonNet mailing list -- pythonnet@python.org To unsubscribe send an email to pythonnet-le...@python.org https://mail.python.org/mailman3/lists/pythonnet.python.org/ Member address: arch...@mail-archive.com