enumeration Fails with get(), set() arguments

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dpb on 31 May 2021
Answered: dpb on 31 Dec 2021
classdef XlBordersIndex < int32
xlDiagonalDown (5)
xlDiagonalUp (6)
xlEdgeLeft (7)
xlEdgeTop (8)
xlEdgeBottom (9)
xlEdgeRight (10)
xlInsideVertical (11)
xlInsideHorizontal (12)
Sample consumer routine
function SetBorder(sheetReference, ranges, border, weight, style)
% Usage
% SetBorder(WorksheetObject, ranges, borderIndex, borderWeight, lineStyle)
% sets the worksheet cell ranges specific border to the weight and style specified
% ranges is a char string, cellstr, or array of cellstr or string ranges
% borderIndex, borderWeight and lineStyle are scalar values
if ischar(ranges), ranges=cellstr(ranges); end
for i=1:numel(ranges)
borders=get(theCell, 'Borders');
thisBorder=get(borders, 'Item', border);
set(thisBorder,'LineStyle', style,'Weight',weight);
catch ME
fprintf('Error in function SetBorder.\nError Message:\n%s\n', ME.message)
%warning('Error in function SetBorder.\n%s\n', ME.message)
called as
% draw border above totals row to show summations, payouts
ixTotal=find(matches(cBill(:,matches(cBill(1,:),'Scholarship')),'Billing Total'));
addr=[cellstr(join(string([arrayfun(@(r) xlsAddr(r,ixCols(1)),ixTotal,'UniformOutput',false), ...
arrayfun(@(r) xlsAddr(r,ixCols(2)),ixTotal,'UniformOutput',false)]),':')); ...
arrayfun(@(r) xlsAddr(r,ixCols(3)),ixTotal,'UniformOutput',false)];
Excel_utils.SetBorder(wksht,addr,XlBordersIndex.xlEdgeTop,XlBorderWeight.xlMedium, ...
results in
errorMessage =
'Error in function SetBorder.
Error Message:
Error: Object returned error code: 0x800A03EC'
If one inserts
if isenum(border), border=int32(border); end
if isenum(weight), weight=int32(weight); end
before the loop, the function runs without error and successfully changes the desired cell range borders to style and type requested.
This seems to pretty-much negate the whole point of an enumeration -- is there any cleaner workaround?
Looks to me like a bug although I suppose since is external interface they can claim "unsupported" usage.
  1 Comment
dpb on 31 May 2021
Oh. There's a secondary Q? here as well -- one will note the peculiar code in the catch clause of
catch ME
fprintf('Error in function SetBorder.\nError Message:\n%s\n', ME.message)
%warning('Error in function SetBorder.\n%s\n', ME.message)
The initial use of the warning() statement on its own caused me to not discover the above error for some time when looking at the resulting spreadsheet instead of letting me know when was created -- why is no warning message shown if write
catch ME
msg=sprintf('Error in function SetBorder.\nError Message:\n%s\n', ME.message);
or the version with the formatting string inside warning() as the nag screen would have you?
Hence, just the expedient of fprintf w/o the trailing semicolon so see the message.

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Answers (1)

dpb on 31 Dec 2021
OK, I (finally!) figured out how to code the above to use a named constant with external interface -- don't use MATLAB enumeration but declare the constants as (Constant) in a class instead. ML enumerations are only useful inside MATLAB code that can and does interpret what an enumeration object is; don't try to use it elsewhere.
A sample class that does work is
classdef XlBorderWeight
properties (Constant)
xlHairline = 1 % Hairline (thinnest border).
xlMedium =-4138 % Medium.
xlThick = 4 % Thick (widest border).
xlThin = 2 % Thin.

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