Web App Using System Command To Write File
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Howdy,
I am trying to use system("command") to execute an external program (.exe running on Windows) which writes out files. The app works fine normally. I run the code as an app, I press a button, it executes system("command"), this "command" runs external_program.exe, external_program.exe writes out a file, and everything works as intended. It is only when it is used as a webapp that it does not work. The external_program.exe dose not write out successfully when being executed by a webapp using system("command").
I can have the webapp output the exact system "command" its trying to run, copy that command, run that command in a command prompt, and it works as intended. So I know it has to do something with the webapp.
I ran the following matlab code:
getenv('USERNAME')
getenv('programdata') %directory for program specific data
getenv('appdata') %directory for user specific data (roaming)
getenv('localappdata') %directory for user specific data (local)
getenv('userprofile') %current user profile folder
I get the following response when it is ran as an app:
ans = 'owner123'
ans ='C:\ProgramData'
ans ='C:\Users\owner123\AppData\Roaming'
ans ='C:\Users\owner123\AppData\Local'
I get the following response when it is ran as an webapp:
ans = 'MwWebAppWorkerR2020a'
ans ='C:\ProgramData'
ans ='C:\Users\MwWebAppWorkerR2020a\AppData\Roaming'
ans ='C:\Users\MwWebAppWorkerR2020a'
I thought maybe this is a permission issue. So I moved the external_program.exe file to 'C:\Users\MwWebAppWorkerR2020a', change the ownership of external_program.exe to 'MwWebAppWorkerR2020a', gave "full control" (permission wise) for "everybody" including the following users: "MwWebAppWorkerR2020a", "MwWebAppServerR2020a", "MwWebAppAuthorsR2020a".
After doing this, I still can not get the webapp to use system("command") to execute external_program.exe properly where it writes out files successfully.
I'm thinking maybe I didn't do the permissions properly or when the external_program.exe tries to write out it can not write because how it is ran with permission incorrectly. Any advice on how to overcome this? Or how can I get the webapp to run the system("command") successfully like how it does in app form?
5 个评论
Mario Malic
2020-10-30
Try giving full control to the folder your program writes in.
Kev K
2020-10-30
Thank you, Mario, for your reply. I have double checked the folder has full control
I have given full control, and it still can't write out to the folder. Any other idea what it could be?
Mario Malic
2020-10-30
Alright, can you check what is current directory (cd) of the web app when it runs (sorry, I have never worked with it, so this might look like a silly question)? At least in my case, temporary/session files from the external program are generated in cd before they are saved to the specified folder. Are you using fullpaths in system command?
Kev K
2020-10-31
Mario Malic
2020-10-31
That's great! You're welcome.
It would be great if you could just post a reference to your comment in answer section and accept it, so it's clear for other people who may encounter an issue similar to yours.
采纳的回答
Kev K
2020-12-13
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Mario Malic
2020-12-13
编辑：Mario Malic
2020-12-13
I wanted to make an update on this. It is possible to have a better control of the program you're calling with System.Diagnostics.Process. There's a property called StartInfo.WorkingDirectory that could be really useful in your case. There's an example here, without WorkingDirectory.
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