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97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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#include "CoreMinimal.h"
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#include "Misc/Paths.h"
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#include "HAL/FileManager.h"
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#include "HAL/PlatformProcess.h"
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#include "Modules/ModuleInterface.h"
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#include "Modules/ModuleManager.h"
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#if WITH_PYTHON
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THIRD_PARTY_INCLUDES_START
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// We include this file to get PY_MAJOR_VERSION
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// We don't include Python.h as that will trigger a link dependency which we don't want
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// as this module exists to pre-load the Python DLLs, so can't link to Python itself
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#include "patchlevel.h"
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THIRD_PARTY_INCLUDES_END
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#endif // WITH_PYTHON
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class FPythonScriptPluginPreload : public IModuleInterface
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{
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public:
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virtual void StartupModule() override
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{
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#if WITH_PYTHON
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LoadPythonLibraries();
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#endif // WITH_PYTHON
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}
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virtual void ShutdownModule() override
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{
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#if WITH_PYTHON
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UnloadPythonLibraries();
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#endif // WITH_PYTHON
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}
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private:
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#if WITH_PYTHON
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void LoadPythonLibraries()
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{
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#if PLATFORM_WINDOWS
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// Load the DLLs
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{
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// Build the full Python directory (UE_PYTHON_DIR may be relative to UE4 engine directory for portability)
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FString PythonDir = UTF8_TO_TCHAR(UE_PYTHON_DIR);
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PythonDir.ReplaceInline(TEXT("{ENGINE_DIR}"), *FPaths::EngineDir(), ESearchCase::CaseSensitive);
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FPaths::NormalizeDirectoryName(PythonDir);
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FPaths::RemoveDuplicateSlashes(PythonDir);
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const FString PythonDllWildcard = FString::Printf(TEXT("python%d*.dll"), PY_MAJOR_VERSION);
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auto FindPythonDLLs = [&PythonDllWildcard](const FString& InPath)
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{
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TArray<FString> PythonDLLNames;
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IFileManager::Get().FindFiles(PythonDLLNames, *(InPath / PythonDllWildcard), true, false);
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for (FString& PythonDLLName : PythonDLLNames)
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{
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PythonDLLName = InPath / PythonDLLName;
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FPaths::NormalizeFilename(PythonDLLName);
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}
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return PythonDLLNames;
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};
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TArray<FString> PythonDLLPaths = FindPythonDLLs(PythonDir);
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if (PythonDLLPaths.Num() == 0)
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{
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// If we didn't find anything, check the Windows directory as the DLLs can sometimes be installed there
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FString WinDir = FPlatformMisc::GetEnvironmentVariable(TEXT("WINDIR"));
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if (!WinDir.IsEmpty())
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{
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PythonDLLPaths = FindPythonDLLs(WinDir / TEXT("System32"));
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}
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}
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for (const FString& PythonDLLPath : PythonDLLPaths)
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{
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void* DLLHandle = FPlatformProcess::GetDllHandle(*PythonDLLPath);
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check(DLLHandle != nullptr);
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DLLHandles.Add(DLLHandle);
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}
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}
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#endif // PLATFORM_WINDOWS
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}
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void UnloadPythonLibraries()
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{
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for (void* DLLHandle : DLLHandles)
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{
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FPlatformProcess::FreeDllHandle(DLLHandle);
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}
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DLLHandles.Reset();
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}
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TArray<void*> DLLHandles;
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#endif // WITH_PYTHON
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};
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IMPLEMENT_MODULE(FPythonScriptPluginPreload, PythonScriptPluginPreload)
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