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First command-line argument passed to UE4Editor fails to parse when using project switcher

When you start up UE4Editor.exe, you get the project switcher. When you select the project, it re-launches the Editor, passing in the project on the command-line. Example:

 UE4Editor.exe "C:/Development/ExampleProject/Example.uproject"

If you pass arguments to UE4Editor.exe, it also passes them along to the new instance:

 UE4Editor.exe "C:/Development/ExampleProject/Example.uproject"-first -second

However, it fails to include a space between the path of the project and the first argument. This will then cause any code using FParse::Param(FCommandLine::Get()) to not find the first argument.

An easy way to reproduce this is using -debug as the first argument. This should start the project in DebugGame rather than Development. My current workaround is to have a garbage first argument that gets ignored, as such:

 UE4Editor.exe -garbage -debug

Expected behavior: when passing arguments to the newly spawned UE4Editor.exe instance, include a space between the project path and the other arguments.

Product Version: UE 4.19
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asked May 10 '18 at 12:04 AM in Bug Reports

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avatar image Jeff A ♦♦ STAFF May 14 '18 at 02:05 PM


We've recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.



avatar image JNighthawk May 14 '18 at 07:17 PM

Thanks! I feel I've made the issue clear here. I don't feel like duplicating my efforts, so I won't be copying it over there. Helpful to know in the future.

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