send last modification time of files to check for changed files

Source/VAPlugin/Private/VAServerLauncher.cpp

@@ -11,6 +11,7 @@
 #include "VAUtils.h"
 #include "VASettings.h"
 #include "VAPlugin.h"
+#include "HAL/FileManagerGeneric.h"
 
 
 bool FVAServerLauncher::RemoteStartVAServer(const FString& Host, const int Port, const FString& VersionName, const FString& VARendererIniFile, const EReproductionInput ReproductionInputType)
@@ -213,15 +214,23 @@ bool FVAServerLauncher::SendFileToVAServer(const FString& RelativeFilename)
 
 	TArray<uint8> FileBinaryArray;
 	FFileHelper::LoadFileToArray(FileBinaryArray, *FPaths::Combine(FPaths::ProjectContentDir(),RelativeFilename));
+	FString FullPath = FPaths::Combine(FPaths::ProjectContentDir(), RelativeFilename);
+	const TCHAR* charFilePath = *FullPath;
+	FFileManagerGeneric fm;
+	FDateTime LastModification = fm.GetTimeStamp(charFilePath);
 
 	const FString ProjectName = GetDefault<UGeneralProjectSettings>()->ProjectName;
-	FString MetaInfo = "file:"+RelativeFilename+":"+FString::FromInt(FileBinaryArray.Num())+":"+ProjectName;
+	FString MetaInfo = "file:"
+			+RelativeFilename+":"
+			+FString::FromInt(FileBinaryArray.Num())+":"
+			+ProjectName+":"
+			+FString::FromInt(LastModification.ToUnixTimestamp());
 	TArray<uint8> MetaInfoBinary = ConvertString(MetaInfo);
 
 	int32 BytesSend;
 	VAServerLauncherSocket->Send(MetaInfoBinary.GetData(), MetaInfoBinary.Num(), BytesSend);
 	//Receive response
-	const int32 BufferSize = 16;
+	const int32 BufferSize = 128;
 	int32 BytesRead = 0;
 	uint8 Response[16];
 	if (VAServerLauncherSocket->Recv(Response, BufferSize, BytesRead))
@@ -239,7 +248,8 @@ bool FVAServerLauncher::SendFileToVAServer(const FString& RelativeFilename)
 			}
 			FVAUtils::LogStuff("[FVAServerLauncher::SendFileToVAServer()]: Entire file ("+RelativeFilename+") send!", false);
 			VAServerLauncherSocket->Recv(Response, BufferSize, BytesRead);
-			if(BytesRead==3 && Response[0]=='a' && Response[1]=='c' && Response[2]=='k')
+			ResponseString = ByteArrayToString(Response, BytesRead);
+			if(ResponseString == "ack")
 			{
 				FVAUtils::LogStuff("[FVAServerLauncher::SendFileToVAServer()]: File was received by VAServerLauncher successfully!", false);
 				//the search path is added potenitally multiple times, but can only be added once the folder is created (which the above guarantees)