Unreal Engine 4 Use Custom Dll Path

use_custom_dll_path.cpp

void FVideoPlayerModule::SetDllPath()
{
	//FString AbsPath = FileManager::Get().ConvertToAbsolutePathForExternalAppForRead(*MyLibPath);
	const auto PluginBaseDir = IPluginManager::Get().FindPlugin("VideoPlayer")->GetBaseDir();
	const auto PluginBaseDirAbs = FPaths::ConvertRelativePathToFull(PluginBaseDir);
	XVideoDllPath = FPaths::Combine(PluginBaseDirAbs, TEXT("Source/VideoPlayer/ThirdParty/XVideo/bin/"));
	FPlatformProcess::AddDllDirectory(*XVideoDllPath);
	FPlatformProcess::PushDllDirectory(*XVideoDllPath);
  // not need load and manage dll manually, will be auto load
	//const auto Dlls = {
	//	// FFMpeg
	//	FString("avutil-56.dll"),
	//	FString("swscale-5.dll"),
	//	FString("swresample-3.dll"),
	//	FString("postproc-55.dll"),
	//	FString("avcodec-58.dll"),
	//	FString("avformat-58.dll"),
	//	FString("avfilter-7.dll"),
	//	FString("avdevice-58.dll"),
	//	// XVideo
	//	FString("XLog.dll"),
	//	FString("XGraphic.dll"),
	//	FString("XVideo.dll"),
	//};

	//for (const FString& Dll : Dlls)
	//{
	//	//const auto Handler = FPlatformProcess::GetDllHandle(*FPaths::Combine(XVideoBaseDir, *Dll));
	//	const auto Handler = FPlatformProcess::GetDllHandle(*Dll);
	//	DllHandlers.Add(Handler);
	//}
}

void FVideoPlayerModule::UnsetDllPath()
{
	/*for (int32 i = DllHandlers.Num() - 1; i >= 0; i--)
	{
		FPlatformProcess::FreeDllHandle(DllHandlers[i]);
	}*/
  // must pop this dll path (or maybe?)
	FPlatformProcess::PopDllDirectory(*XVideoDllPath);
}