Unreal Engine Issues

UE-96502

Crash launch application adding .umap url

Crash launch application adding .umap url

Description

The application crashes when adding ".umap" to the launch map at application launch. If not specify ".umap", it will be able to launch application. There appears to be a failure to parse the URL. The URL parameters indicate that it is optional.

https://docs.unrealengine.com/en-US/Programming/Basics/CommandLineArguments/index.html

It's a regression of 4.25 because it works in 4.24.

 

Following code is workaround.

FURL::FURL( FURL* Base, const TCHAR* TextURL, ETravelType Type )
{
    // ...

#if 0
(DotIdx != MapExtIdx || FChar::IsAlnum(URLStr[DotIdx+MapExtLen])) &&
((DotIdx + 1) != SaveExtIdx || FChar::IsAlnum(URLStr[DotIdx+SaveExtLen+1])) &&
((DotIdx + 1) != DemoExtIdx || FChar::IsAlnum(URLStr[DotIdx+4+1]));
#else
(DotIdx != MapExtIdx || FChar::IsAlnum(URLStr[DotIdx + MapExtLen - 1])) &&
((DotIdx + 1) != SaveExtIdx || FChar::IsAlnum(URLStr[DotIdx + SaveExtLen + 1 - 1])) &&
((DotIdx + 1) != DemoExtIdx || FChar::IsAlnum(URLStr[DotIdx + 4 + 1 - 1]));
#endif
}
Steps to Reproduce
  1. Open Third Person Template.
  2. Add new map what named "TestMap" and placed in "/Geme/TestMap.umap" .
  3. Packaging project with Win64.
  4. Create shortcut of .exe file and add launch argument "/Game/TestMap.umap".

Result:

 Crash and show attached popup.

Expected:

 Not crash and open TestMap level.

Callstack
ReportAssert() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1541]
FWindowsErrorOutputDevice::Serialize() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
FOutputDevice::LogfImpl() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
AssertFailedImplV() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100]
FDebug::CheckVerifyFailedImpl() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450]
DispatchCheckVerify<void,<lambda_0d1e902b4205814301cca75abd414bf2> >() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Core\Public\Misc\AssertionMacros.h:162]
FURL::FURL() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Engine\Private\URL.cpp:389]
ULocalPlayer::SpawnPlayActor() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Engine\Private\LocalPlayer.cpp:282]
UEngine::LoadMap() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:12879]
UEngine::Browse() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:12101]
UGameInstance::StartGameInstance() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Engine\Private\GameInstance.cpp:579]
FEngineLoop::Init() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4032]
GuardedMain() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Launch\Private\Launch.cpp:155]
GuardedMainWrapper() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
WinMain() [G:\UnrealEngine-4.25.3-release\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
__scrt_common_main_seh() [d:\A01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]

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Fixed
ComponentUE - Foundation - Core
Affects Versions4.25
Target Fix4.26
Fix Commit14097364
CreatedAug 6, 2020
ResolvedAug 13, 2020
UpdatedFeb 16, 2021
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