App Designer standalone app can't find external file

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Scotty Mac
Scotty Mac 2023-10-26
回答： Scotty Mac 2023-10-30
I have an App Designer app that includes a text file for calculations. When I debug, it works correctly.
But when I create a 'Standalone Desktop App and install the program, the app can't find the included text file and crashes. I see the included file in the same directory as the .exe file. Here is my code:
% Load the CTP Timing Protocol File for Processing
ctp_tpfilename = 'HB_CTP.txt';
f = fopen(ctp_tpfilename);
data = textscan(f,'%s');
fclose(f);
registers = data{1}(2:2:end);
registers = convertCharsToStrings(registers);
...
Am I missing the path to the file? I dont know the path it is trying, since this is the compiled application. How can I tell it to look in the same directory are the main executable file?
Thanks in advance.
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Scotty Mac
Scotty Mac 2023-10-27
编辑：Scotty Mac 2023-10-27
@Voss But how do I see the current directory path in a compiled standalone windows desktop application? Once I found that out, I can hard code the path to my .txt file in the code inorder to read it in.
Voss
Voss 2023-10-27
When you compile using deploytool, uncheck the box under "Additional runtime settings" that says "Do not display the Windows Command Shell (console) for execution". This will pop up a console window when the exe runs and any command-line output will go to that console, including the result of fprintf('%s\n',pwd).

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Scotty Mac
Scotty Mac 2023-10-30
Thank you for all the suggestions. I figured it out. I had to add this bit of code to determine if the app was deployed as a standalone app or run in Matlab.
if isdeployed
[status, result] = system('path');
installpath = char(regexpi(result, 'Path=(.*?);', 'tokens', 'once'));
else
installpath = pwd;
end
Then I added this to my read lines:
f = fopen(fullfile(installpath, ctp_tpfilename));
data = textscan(f,'%s');
fclose(f);
Now it reads the included file in the installed directory or my current directory while debugging.

更多回答（2 个）

chrisw23
chrisw23 2023-10-27
移动：Rik 2023-10-27
You have to add dependent files manually in the Compiler App Project before building the standalone component. Since there's no path specified, the file is expected beside your app executable. The app will not be executed in the path where it will be started. It's executed (extracted) in a users temp folder. That's where your file is expected to be loaded without a path specified.
...your app path is somewhere here
C:\Users\<userName>\AppData\Local\Temp\<userName>\mcrCache<MatlabRuntimeVersion>\<yourAppName>
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Voss
Voss 2023-10-27
That's right, so compiling the txt with the exe is not the way to go.
Typically, I would put some UI components in the app that allow the user to select the file they want to use, i.e., with uigetfile(), and store the full path to the file as an app property or whatever.
Scotty Mac
Scotty Mac 2023-10-27
I thought so, thanks.
In this case, I dont want the user to able to select the data file (I have that functionality for loading & saving in another place of my GUI app. This external file is strictly a data file for my algorithm to use. It should transparent to the user. If I want to change a value or two, I'll know where that file is and can change it on the fly, without recompiling the app.

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Scotty Mac
Scotty Mac 2023-10-27
编辑：Scotty Mac 2023-10-27
I have included the HB_CTP.txt in the compiler app when creating the Standalone Desktop App. Once installed, I see the required .txt file in the same directory as the .exe file (see below both highlighted):
But it seems like the app can't find that included file...
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Voss
Voss 2023-10-27
How are you running the exe? E.g., just double-clicking on it? Or using a desktop shortcut? Or running it programmatically, e.g., from a Windows/DOS console?
Referring to 'HB_CTP.txt' in the code makes the code look for that file in the working directory, i.e., the directory returned by pwd().
The working directory when the exe starts is the location where the exe is run from. If double-clicking, the working directory is the location of the exe, in which case the code should find the text file, since it is in the same directory. If running the exe some other way, then the working directory may not be the location of the exe, and you can expect the program not to find the text file.
What happens when you run the exe? Do you get an error message about using textscan() with an invalid file identifier?
Scotty Mac
Scotty Mac 2023-10-29
I am running it from the installed shortcut. I will put debugs in to see what path it is using.

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