How can I determine if a matlab app is running as a web app?

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Roger Schvaneveldt
Roger Schvaneveldt 2020-11-2
编辑： Sean de Wolski 2025-9-23，17:14
I need to retrieve and save data differently when an app is running as a web app so I need something like is deployed that distinguishes between web deployment and standalone app deployment.
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Roger Schvaneveldt
Roger Schvaneveldt 2020-11-5
编辑：Roger Schvaneveldt 2020-11-5
I found a suggestion that led me to solve the problem with this function which requires creating an empty file named, file.to.add.to.web.app, and adding that file to the compiled web app.
function tf = iswebdeployed()
% tf = iswebdeployed()
% tests whether an app is running as a web app
% must include a file named file.to.add.to.web.app when compiling a web app
% tf = isdeployed && exist('file.to.add.to.web.app', "file");
tf = isdeployed && exist('file.to.add.to.web.app', "file");
end
William Thielicke
William Thielicke 2024-1-21
I would need something similar, my code would need something like "ismatlabonline" in addition to ispc, isunix and ismac... Nothing like this available?

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回答（2 个）

Hiro Yoshino
Hiro Yoshino 2020-11-2
Web apps run in your browser and stand-alone app opens your system window(s) and run in it (them).
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Mike McCullough
Mike McCullough 2024-1-31
编辑：Rena Berman 2024-9-30
As a developer and seller of software, all files the user needs should NEVER be in the same folder. They need to be on a server or in the ROOT of C:. So my readmatrix(), open(), & load() have their files in a ROOT folder or:
weight = load('c:\appsM\54WEIGHT.DAT'); % C drive
weight = load('/MATLAB Drive/appsM/54WEIGHT.DAT'); % matlab drive
Walter Roberson
Walter Roberson 2024-1-31
编辑：Walter Roberson 2024-1-31
if ispc
filebase = 'C:';
else
filebase = '/MATLAB Drive';
end
filename = fullfile(filebase, 'appsM', '54WEIGHT.DAT');
weight = load(filename);
Hardcoding the base directory is a bad idea even on Windows, as doing so restricts you to a particular directory structure. You should be writing your code so that moving your files around requires only a small amount of changes to initialization.
Suppose that MATLAB Online were to switch to Windows. Then it isn't going to happen to have the same directory structure that you have.

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Sean de Wolski
Sean de Wolski 2025-9-23，17:08
编辑：Sean de Wolski 2025-9-23，17:14
The undocumented answer from here is this:
matlab.internal.environment.context.isWebAppServer
I have a few immediate uses:
  • deciding if a second figure can be opened
  • deciding if clipboard can be called
  • deciding about calling various system commands
It's frustrating that this is not a documented function, and a decent or comprehensive list of reasons for its use not documented. Or alternatively, that there were public capabilities that could be accessed like (matlab.environment.capability.ClipboardAvailable)

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