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As Lee says, it doesn't know, it is a bit of a blunt LISP that does the job and no more. Lees is much better but I had a mental block yesterday, couldn't remember cmdactive.

If you need more information, check the documentation on the CMDACTIVE system variable.

It won't - it will continue indefinitely until the user presses Esc to force it to exit.

I am still new with Lisp, but it feels that this is more elegant by checking if a command is active?

So the first line keeps doing the loop while it is not nil? How will it know it is not nil?

I think I've achieved a workaround. I'm going to set a macro within excel that exports the data to a CSV every time the excel document is saved (overwriting the existing versions). I'm then going to read this using the standard IO functions available to me in LT. It's not the cleanest solution, but I believe it should work. If anyone has any advice regarding pitfalls etc. that I might encounter please feel free to enlighten me

That's unfortunate @Steven P haha if only it were this simple...Honestly I've never experienced resistance like this before! Could a LISP in LT export the Excel data to a CSV, pull the data from that, and the delete the CSV? I'm going to assume that the answer is no due to the lack of vlax-get-or-create-object.

Yeah, LT is a problem, you won’t have vlax-get-or-create-object, you could probably parse .CSV files though

Might be tricker in LT - not every function works Resistant to change... just show them it is quicker, subtle ways like doing everything and grabbing a coffee while they are still piling through it the 'old' way

I have access to AutoCAD 2025 and AutoCAD LT 2025, however I'm trying to build it in a manner where it functions in LT as thats what most of the guys use

Are you using AutoCAD LT 2025?

@Danielm103 Thank you for this, it looks really good. The problem is that I'm building this for people that are exceptionally resistant to change, and really I need a standalone lisp that can just be launched from within autocad and handles everything. If there is any more complexity to it than that, then it simply wont even be considered for adoption @Steven P Thanks for the info, I'll take a look this evening once I've got my actual work out of the way for the day

BigAl is pretty good with Excel - got to wait for him to wake up - he's got some stuff stashed away that might also do the trick, also look in 'downloads' at the top here, Alan Excel might do what you want with the excel part.

I have an app on the store, XLSX Field Evaluator https://apps.autodesk.com/ACD/en/Detail/Index?id=4867035866745163447&appLang=en&os=Win64 You can add fields to block attributes that are linked to excel There’s trial version https://apps.autodesk.com/ACD/en/Detail/Index?id=4446191126131749248&appLang=en&os=Win64 it never expires, capped at 20 fields though

@Lee Mac Ok fantastic that's great news thank you. The problem is that this data will ALWAYS be held and monitored in an excel spreadsheet. The company uses this method as a standard and it will never change, I'm trying to gather the data without changing any procedures as this would invoke carnage. I've got the code to read from and write to the blocks working fine. As the next step, I'm trying to simply read a cell value from Excel, but it keeps throwing "error: bad argument type: VLA-OBJECT nil" and I don't have the experience to figure out why (I'm new to LISP). This is the code I have. Are you able to give me a nudge in the right direction? Or provide some sample code that will let me read a cell value? Many thanks; (defun c:FindExcelValue ( / fname xlApp xlBook xlSheet searchStr foundVal row col cellVal) ;; Prompt for Excel file path (setq fname (getfiled "Select Excel file" "" "xls;xlsx" 0)) (if fname (progn ;; Ask for search string (setq searchStr (getstring T "\nEnter string to search for: ")) ;; Start Excel (setq xlApp (vlax-get-or-create-object "Excel.Application")) (setq xlBook (vlax-invoke-method (vlax-get-property xlApp 'Workbooks) 'Open fname)) (setq xlSheet (vlax-get-property xlBook 'ActiveSheet)) ;; Assume search in column A (col = 1) (setq row 1 col 1 foundVal nil) ;; Loop until empty cell (while (and (not foundVal) (setq cellVal (vlax-get-property (vlax-get-property xlSheet 'Cells) 'Item row col)) (/= (vlax-get-property cellVal 'Value) nil)) (if (= (strcase (vlax-get-property cellVal 'Value)) (strcase searchStr)) (setq foundVal (vlax-get-property (vlax-get-property xlSheet 'Cells) 'Item row (1+ col)) 'Value)) (setq row (1+ row)) ) ;; Print result (if foundVal (princ (strcat "\nFound value: " (vl-princ-to-string foundVal))) (princ "\nString not found.") ) ;; Clean up (vlax-invoke-method xlBook 'Close :vlax-false) (vlax-release-object xlSheet) (vlax-release-object xlBook) (vlax-release-object xlApp) ) ) (princ) )

Yes, this is possible; though, you'll find it easier using a .csv/.txt file (which can be read using standard AutoLISP IO functions), in lieu of an .xls/.xlsx file (for which you'll need to use ActiveX(COM) to interface with the installed Excel application). Once the data has been acquired however, updating the block attributes is straightforward.

Hi all, I have an idea for an AutoCAD lisp, but I don't know if it's possible. I'd like to get a sanity check before I attempt creating it! The process I'm thinking of is as follows; 1. Iterate through a number of blocks in the .dwg (blocks are always in model space) 2. For each block grab an attribute value held within the block (FIN-B / FIN-C) in the example dwg - This data will be entered manually for each block 3. Search for this "value" in an external excel file (prompt user to pick a file) - The value will always be in Column A 4. Copy the information held in the three relevant cells (Column B - the the same row and the next two rows below) back into the block (FIN-LINE-1 / 2 / 3) 5. Repeat this process until all named blocks are populated (theExcel.xlsxre are 10 blocks maximum) I don't mind if I have to change the formatting a little etc. But I'd just like to know if this would actually be possible or if I will hit a barrier that will prevent it from working. Could anyone please tell me if this is possible or would it be a waste of time to try? I've attached an example .dwg and excel file for reference. Thank you in advance for any help. Cad Blocks.dwg

... I didn't tell you that I use GStarCAD: this would be one of the very rare cases where an AutoCAD lisp is not compatible with GStarCAD! I need to try it on a co-worker PC: they use AutoCAD LT (which should now make the lisps work... let's hope also the VL-XXX ones!). Anyway, thank you for your availability.

Thank you very much @Nikon! Thank you.

@

Does anyone know how to turn off the setting that prompts to "Verify attribute values"? I am trying to run a script.

Select both polylines find the polyline that has the most vertex Then process those vertex with vlax-curve-getClosestPointTo store the mid point of vertex and closest point in a list entmake new polyline with list points. Seems to work well tho will need to test if you have open or closed polylines. defaults to closed tho i don't think its quite the mid / avg path ;;----------------------------------------------------------------------------;; ;; CLOSE POLY AVERAGE, Finds the mid point avg between close polylines donut shape (defun c:CLOSEPOLYAVG (/ sel1 sel2 ent1 ent2 cnt1 cnt2 main other i ptv ptc mid pts) (defun c:CPA () (C:CLOSEPOLYAVG)) (defun midpt (p1 p2) (mapcar '(lambda (a b) (/ (+ a b) 2.0)) p1 p2) ) (setq sel1 (entsel "\nSelect First close Polyline: ")) (setq sel2 (entsel "\nSelect Second closed Polyline: ")) (if (and sel1 sel2) (progn (setq ent1 (vlax-ename->vla-object (car sel1)) ent2 (vlax-ename->vla-object (car sel2)) cnt1 (fix (vlax-curve-getEndParam ent1)) cnt2 (fix (vlax-curve-getEndParam ent2)) ) (if (> cnt1 cnt2) (setq main ent1 other ent2) (setq main ent2 other ent1) ) (setq pts '()) (setq i 0) (while (<= i (fix (vlax-curve-getEndParam main))) (setq ptv (vlax-curve-getPointAtParam main i)) (setq ptc (vlax-curve-getClosestPointTo other ptv)) (setq mid (midpt ptv ptc)) (setq pts (append pts (list mid))) (setq i (1+ i)) ) (entmake (append (list '(0 . "LWPOLYLINE") '(100 . "AcDbEntity") '(100 . "AcDbPolyline") (cons 90 (length pts)) '(70 . 1) ;; closed ) (mapcar '(lambda (p) (cons 10 p)) pts) ) ) (princ "\nNew midpoint polyline created.") ) (princ "\nSelection error.") ) (princ) )

@pkenewell Thank you very much. I finally got it working. In my case, I set the "length of arcs" to 1. And it worked. But I think the resulting axis isn't very geometrically rigorous. I've attached an example image: -The polyline created by the command is shown in green. -The correct geometry of the axis is shown in dashed red. I think there should be a more geometrically rigorous solution in some older Lisp. Is it possible? Does anyone know of one?

That did exactly what I needed. Thanks so much!