4D v15R4 introduces a new system variable to assist with error handling. The new system variable is Error formula and can only be used in an error-catching method set from the ON ERR CALL command. The result can be extracted by copying the contents to a process variable.

Sample:

//GetErrorObject OB SET(obError;"Error";Error) OB SET(obError;"Error method";Error method) OB SET(obError;"Error line";Error line) OB SET(obError;"Error formula";Error formula)

//SampleMethod C_OBJECT(obError) ON ERR CALL("ErrorTest") $docRef:=Create document($docPath) ON ERR CALL("")

Results: