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Problem about teh strcat command

I'm a newcomer, and I'm studying the SKILL.
I wrote some code to report the dummy net pin and single pin( or unconnected pin), then asign the list to a form, browse them one by one. But one problem occured. For some projects, there is a error information for strcat command:
Error* strcat: argument #1 should be either a string or a symbol

The part of code is like this:

let((Pin_List Dummy_Pin_List Single_Pin_List)
Pin_List=Dummy_Pin_List=Single_Pin_List=nil
foreach( item Pin_List
if(item->net->name=="" then
Dummy_Pin_List=cons(strcat(item->component->name "." item->number) Dummy_Pin_List)
Dummy_Pin_List=sort(Dummy_Pin_List 'alphalessp)
else
if(length(item->branch->children)==1 then
Single_Pin_List=cons(strcat(item->component->name "." item->number " / " item->net->name) Single_Pin_List)
Single_Pin_List=sort(Single_Pin_List 'alphalessp)
);if
);if
);foreach
);let

Who can help me with this problem. thanks.

Originally posted in cdnusers.org by leonlee

archive over 19 years ago

of course

The Pin_List is generateed by below code:

axlDBRefreshId(axlDBGetDesign())
axlClearSelSet()
axlSetFindFilter(?enabled '(noall pins) ?onButtons '(noall pins))
Pin_List=axlGetSelSet(axlAddSelectAll())

Originally posted in cdnusers.org by leonlee
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archive over 19 years ago

You are getting every pin record in the board database. Some of theins may be mechanical pins which have no number value. Then when you strcat item -> number strcat fails as you are seeing.

Try adding a conditional that traps null item -> numbers
For example
if(item -> number != nil then

Originally posted in cdnusers.org by AshCan
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archive over 19 years ago

OK, thank you very much for your answer.
I'll try it soon~~~

Originally posted in cdnusers.org by leonlee
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archive over 19 years ago

Another technique to address unwanted nil values is to use OR:
strcat(x y item->number||"" z)
Since 'or' stop evaluating on non-nil ("true") values from left to right.

And not related to your question - you should sort once after
the foreach statement (for improved performance).

Originally posted in cdnusers.org by natan
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archive over 19 years ago

Ok, the reason is:

for the mechanical pin, item->component=nil item->nuber=""(null)

I ignored it~~~

Originally posted in cdnusers.org by leonlee
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