TCP Socket Listener, Receiving Binary Data into UE4 From a Python Script!

Rama · August 19, 2016, 3:53pm

Blinky0815;581427:

Hi ,
thanks for putting up so many awesome tutorials.

To make the network code work with the current stable version of UE4 a few little things need to be changed:
**
Within the Header:**
bool StartTCPReceiver(const FString& YourChosenSocketName, const FString& TheIP, const int32 ThePort);
FSocket* CreateTCPConnectionListener(const FString& YourChosenSocketName, const FString& TheIP, const int32 ThePort, const int32 ReceiveBufferSize = 2*1024*1024);
void TCPConnectionListener();
void TCPSocketListener();
bool FormatIP4ToNumber(const FString& TheIP, uint8 (&Out)[4]);
FString StringFromBinaryArray(const TArray&lt;uint8&gt;& BinaryArray);
void LaunchNetwork();
virtual void BeginDestroy(); // without this, the code runs well – once. The second time, the Editor crashes.
//  TCP networking
FSocket* ListenerSocket;
FSocket* ConnectionSocket;
FIPv4Endpoint RemoteAddressForConnection;
FTimerHandle tcpSocketListenerTime_handler; // NEW
FTimerHandle tcpConnectionListenerTime_handler; // NEW
**
Within the cpp file:**

in StartTCPReceiver()
//Start the Listener! //thread this eventually
GetWorldTimerManager().ClearTimer(tcpConnectionListenerTime_handler); // properly initialize
GetWorldTimerManager().SetTimer(tcpConnectionListenerTime_handler, this, &::ATCPTestCharacter::TCPConnectionListener, 0.01, true); // SetTimer now needs an FTimerHandle
Basically the same for TCPConnectionListener()
//can thread this too
GetWorldTimerManager().ClearTimer(tcpSocketListenerTime_handler); // properly initialize
GetWorldTimerManager().SetTimer(tcpSocketListenerTime_handler, this, &ATCPTestCharacter::TCPSocketListener, 0.01, true); // SetTimer now needs an FTimerHandle

void ATCPTestCharacter::BeginDestroy() //clean up to prevent crashing the Editor
{
// Call the base class
Super::BeginDestroy();
UE_LOG(LogTemp, Warning, TEXT(“Closing Sockets”));
if(ListenerSocket!=nullptr) {
ListenerSocket->Close();
ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->DestroySocket(ListenerSocket);
}
if(ConnectionSocket!=nullptr) {
    ConnectionSocket-&gt;Close();
    ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)-&gt;DestroySocket(ConnectionSocket);
}
}

//Blinky0815

Dear Blinky,

Hiii there!

Thank you for sharing your research!

If you’d like, you can wrap your code improvements like this
openbracket CODE closebracket
your code
openbracket/codeclosebracket

replacing openbracket with
and closebracket with ]

Results in this



void samplecode()
{
    Yay!
}

and then others will find your wonderful code improvements easier to read!