Is there a way to catch errors in a view macro?

Ben Thornton over 3 years ago

I'm trying to achieve something similar to try/catch in c++ or try/except in python.

0 Jesper Slattengren over 3 years ago

What if you write your macro in Python? That should allow you to use the 'try' construct.

Otherwise there is quite a few functions that perform commands and return an integer (1 if successful and 0 if not). This can be used to catch errors. Here is one example:

var set var = $_self.workdir string=(eval(GETCWD()))

var set var=$_self.FMUdir string=(eval($file_name//'_dir'))

var set var=$_self.createDir string=(eval(MKDIR($_self.FMUdir)))

if cond=($_self.createDir !=1)

var set var=$_self.msg str=("Could not create directory " //$_self.FMUdir)

var set var=$_self.errorFlag int=(EVAL(ALERT2 (msg.self, "ERROR")))

var del var=$_self.msg

end

Here the value of $_self.createDir should be 1. If the directory already exist, a zero will be returned and then a message will be sent to the user.
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0 Ben Thornton over 3 years ago

Thanks for the advice @Jesper Slattengren!

I was hoping for something along the lines of placing a chunk of code in an UNDO block and undoing it if it causes an error.

Your first comment is on point. I should probably just write more in python!
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0 xiongyu.zeng over 3 years ago

I am wondering why I get error message when try to run a cmd file that contains $_self. I created a .cmd that contains beneath code:

var set var = $_self.workdir string=(eval(GETCWD()))

while I get error message that says:

ERROR:  ---------------------------------------------------------------------

ERROR:  Error detected on line number 4, character 16 of a_test.cmd.

ERROR:  Invalid character. Enter a legal character.

ERROR:  The command was not executed.

ERROR:  >> var set var = $_self.workdir string=(eval(GETCWD()))

ERROR:  ---------------------------------------------------------------------
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0 Jesper Slattengren over 3 years ago

In a cmd, there is no "self". In a macro "$_self" refers to the macro itself and these variables lives only in the macro.

What I often do in the case that you describe is to create a temporary library and create the variables I need there.

if condition=(!DB_EXISTS(".myTemp"))

library create library=.myTemp

end

var set var=.myTemp.workfir string=(eval(GETCWD())
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