webread error with input ??

2018 6 13
0 个回答
更新时间：2018 6 18
6 次查看（30 天）

1 个投票

Hi,
I am using webread for the first time in R2017b. Very unusual behavior :
>> webread('https://www.mathworks.com/matlabcentral')
Error using webread (line 119)
First input must be a string array or cell array of character vectors.
But urlread works fine
>> urlread('https://www.mathworks.com/matlabcentral')
ans =
'<!DOCTYPE HTML>
<html>
<head>
Any clue ? Tried restarting Matlab, no help.

9 个评论
显示 7更早的评论 隐藏 7更早的评论

Rik
Rik 2018-6-13
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
Christopher Coello 2018-6-13
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
Christopher Coello 2018-6-13
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
Nirav Sharda 2018-6-15
Can you provide the output of the following command?
which -all webread
Christopher Coello
Christopher Coello 2018-6-16
Here
>> which -all webread
C:\bin\MATLAB\R2017b\toolbox\matlab\external\interfaces\webservices\restful\webread.m
Nirav Sharda
Nirav Sharda 2018-6-18
Can you attach the webread.m file mentioned on the above path?
Christopher Coello
Christopher Coello 2018-6-18
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
Nirav Sharda 2018-6-18
编辑：Nirav Sharda 2018-6-18
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?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Web Services 的更多信息

产品

版本

R2017b

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by