webread error with input ??

Rik 2018 年 6 月 13 日

Odd. I can't reproduce this on R2017b (W10). Digging into the webread function I found out that line 119 is the following code

[url, options] = encodeInputs(url, queryParams, options);

This should not error, as you input is just a char array. Does this same error occur when you try to input it as a string or a cellstr?

Christopher Coello 2018 年 6 月 13 日

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Yes. I tried

webread({'https://www.mathworks.com/matlabcentral'})
Error using webread (line 119)
Expected URL to be one of these types:
char, string, matlab.net.URI
Instead its type was cell.

without success.I agree this is very odd.

Christopher Coello 2018 年 6 月 13 日

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Could it come from the default weboptions ?

 options = 
weboptions with properties:
      CharacterEncoding: 'auto'
              UserAgent: 'MATLAB 9.3.0.713579 (R2017b)'
                Timeout: 5
               Username: ''
               Password: ''
                KeyName: ''
               KeyValue: ''
            ContentType: 'auto'
          ContentReader: []
              MediaType: 'application/x-www-form-urlencoded'
          RequestMethod: 'auto'
            ArrayFormat: 'csv'
           HeaderFields: []
    CertificateFilename: 'C:\bin\MATLAB\R2017b\sys\certificates\ca\rootcerts.pem'

Nirav Sharda 2018 年 6 月 15 日

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Can you provide the output of the following command?

which -all webread

Christopher Coello 2018 年 6 月 16 日

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Here

 >> which -all webread
C:\bin\MATLAB\R2017b\toolbox\matlab\external\interfaces\webservices\restful\webread.m

Nirav Sharda 2018 年 6 月 18 日

Can you attach the webread.m file mentioned on the above path?

Christopher Coello 2018 年 6 月 18 日

webread.m

Here it is

Christopher Coello 2018 年 6 月 18 日

MATLAB Online で開く

By the way, trying everytime I start R2017b, but still get the same error.

 >> webread(sprintf('%s','https://www.mathworks.com/matlabcentral'))
Error using webread (line 119)
First input must be a string array or cell array of character vectors.

Nirav Sharda 2018 年 6 月 18 日

編集済み: Nirav Sharda 2018 年 6 月 18 日

Line 119 of the 'webread' function as mentioned in the error calls the 'encodeInputs' function which in-turn calls another internal function. Can you add break-points in the code and identify the line causing the issue?

webread error with input ??

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