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Potential bug in plugin search paths on Windows?

I went to go package my game which uses a plugin and got the following error:

LogWindows: LoadLibraryWithSearchPaths failed for file D:/Games/Epic Games/Projects/GameName/Plugins/PluginName/Binaries/Win64/UE4Editor-PluginName-7396.dll. GetLastError=126 LogWindows: FileExists returned 1 for Module D:/Games/Epic Games/Projects/GameName/Plugins/PluginName/Binaries/Win64/UE4Editor-PluginName-7396.dll

So we see LoadLibraryWithSearchPaths() fails (later, you can see the proper location is in the full list of search path), and FileExists() returns true (1). The GetLastError() is Windows code for ERROR_MOD_NOT_FOUND.

So I investigated why it could not be found. I believe this may be because of forward slashes. See the following cmd.exe with forward slashes (fails) and backward slashes (file is found).

Forward Slashes (not found, fails):

C:\Windows\System32>dir "D:/Games/Epic Games/Projects/GameName/Plugins/PluginName/Binaries/Win64/UE4Editor-PluginName-7396.dll" Volume in drive D is BIGSTORAGE Volume Serial Number is 141A-DB2C

Directory of D:\Games\Epic Games\Projects\GameName\Plugins\PluginName\Binaries\Win64

File Not Found

Backward slashes (found, works):

C:\Windows\System32>dir "D:\Games\Epic Games\Projects\GameName\Plugins\PluginName\Binaries\Win64\UE4Editor-PluginName-7396.dll" Volume in drive D is BIGSTORAGE Volume Serial Number is 141A-DB2C

Directory of D:\Games\Epic Games\Projects\GameName\Plugins\PluginName\Binaries\Win64

09/23/2017 07:17 PM 264,704 UE4Editor-PluginName-7396.dll 1 File(s) 264,704 bytes 0 Dir(s) 119,722,176,512 bytes free

This looks like the cause of the bug, but I can't imagine I'm the first to run into this problem? Maybe there is something else going on?

From MSDN on LoadLibrary():

If the function cannot find the module, the function fails. When specifying a path, be sure to use backslashes (), not forward slashes (/).

The debug spew does show this in the search paths though...

LogWindows: D:\Games\Epic Games\Projects\GameName\Plugins\PluginName\Binaries\Win64

Product Version: UE 4.17
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asked Sep 24 '17 at 08:42 AM in Packaging & Deployment

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