BluetoothConnector.cpp.obj : error LNK2019: Verweis auf nicht aufgeführtes externes Symbol “BluetoothFindFirstDevice” in Funktion ““public: virtual unsigned int __cdecl BluetoothConnector::Run(void)” (?Run@BluetoothConnector@@UEAAIXZ)”.
E:\Workspaces\GameDev\Binaries\Win64\UE4Editor-CaveUniverse.dll : fatal error LNK1120: 1 nicht aufgeführtes Externe
Hi Kosren - I’m working on a college project to bring in heart rate data as a game variable.
I presume you coded a UE4 blueprint to integrate bluetooth using c++ ?
Were there many lines of code involved and did it take long to figure out ?
Is there any latency in reading the bluetooth data ?
Any help or advice would be great.
Joey
Hi joeycompbell, i coded a pure c++ class which read from a bluetooth socket. I used the windwos sockets. The class got round about 60 lines of codes, but many of them are just thread handling. I dont got any latency problems while reading the datas. I used a queue to process them. I used this thread tutorial as an entry point Maintenance - Unreal Engine. After that I fight me through the mircosoft win_socket documentation. I hope that helps you.
Happy Coding
Kosren
#pragma once
#include "CaveUniversePlayerController.h"
#include "AllowWindowsPlatformTypes.h"
#include "bluetoothapis.h"
#include <WinSock2.h>
#include <ws2bth.h>
#include "HideWindowsPlatformTypes.h"
/**
* A thread which get data from bluetooth dongle
*/
class CAVEUNIVERSE_API BluetoothConnector : public FRunnable
{
//Contstructor
public:
BluetoothConnector();
virtual ~BluetoothConnector();
//Private attributes
private:
SOCKET bluetoothSocket; //The socket which listen to the bluetooth device
SOCKET connected; //The socket which is connected to the smartphone via bluetooth
FThreadSafeCounter stopTaskCounter; //stop the thread with this counter
static BluetoothConnector* connector; //A static singleton to access the thread
FRunnableThread* thread; //The running thread
//Public methods from FRunnable
public:
virtual bool Init();
virtual uint32 Run();
virtual void Stop();
//Public methods
public:
void EnsureCompletion(); //Proper shutdown
static void joyInit(); //A static method to initialize the thread
static void shutdownThread(); //A static method to kill the thread
};
BluetoothConnector.cpp
#include "CaveUniverse.h"
#include "BluetoothConnector.h"
#include <string>
BluetoothConnector* BluetoothConnector::connector = NULL;
BluetoothConnector::BluetoothConnector() {
thread = FRunnableThread::Create(this, TEXT("BluetoothConnector"), 0, TPri_BelowNormal);
}
BluetoothConnector::~BluetoothConnector() {
delete thread;
thread = NULL;
}
//Initialize the thread
bool BluetoothConnector::Init() {
return true;
}
//Run the thread
uint32 BluetoothConnector::Run() {
//A char array to store the incoming data
const int recvBufLen = 1024;
char recvData[recvBufLen];
//Data to initialize the winsocket
WSADATA wsaData;
//The socket which connects to the local device
SOCKADDR_BTH socketAdress;
bluetoothSocket = NULL;
int error = SOCKET_ERROR;
//initialize win socket
error = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (error != NO_ERROR) {
UE_LOG(LogTemp, Error, TEXT("Can not startup the win socket! Last Error:[%d]"), WSAGetLastError());
WSACleanup();
return 1;
}
//Create socket adress of the local socket to the bluetooth dongle
bluetoothSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
socketAdress.addressFamily = AF_BTH;
socketAdress.btAddr = 0;
socketAdress.serviceClassId = RFCOMM_PROTOCOL_UUID;
socketAdress.port = BT_PORT_ANY;
//Bind the socket to the local bluetooth device
error = bind(bluetoothSocket, (SOCKADDR*)&socketAdress, sizeof(socketAdress));
if (error == SOCKET_ERROR) {
UE_LOG(LogTemp, Error, TEXT("Bluetooth socket can not be binded! Last Error:[%d]"), WSAGetLastError());
closesocket(bluetoothSocket);
WSACleanup();
return 1;
}
//Listen on the bluetooth device for incoming connections
error = listen(bluetoothSocket, 1);
if (error == SOCKET_ERROR) {
UE_LOG(LogTemp, Error, TEXT("Bluetooth socket listen failed! Last Error:[%d]"), WSAGetLastError());
closesocket(bluetoothSocket);
WSACleanup();
return 1;
}
//The accepted socket to recieve data from
UE_LOG(LogTemp, Log, TEXT("Waiting for incoming connection"));
connected = accept(bluetoothSocket, NULL, NULL);
UE_LOG(LogTemp, Log, TEXT("Device is connected"));
if (connected != INVALID_SOCKET) {
while (stopTaskCounter.GetValue() == 0) {
//Get data from bluetooth dongle and set the rotation to the actor
error = recv(connected, recvData, recvBufLen, 0);
//We get data so we can use them
if (error > 0) {
//Do somesthing with your data
//Connection was closed or an error appear, we shutdown the thread
} else {
stopTaskCounter.Increment();
}
}
}
//Close connection to the bluetooth device
closesocket(bluetoothSocket);
closesocket(connected);
WSACleanup();
return 0;
}
//Do a joy initialize of the thread
void BluetoothConnector::joyInit() {
if (!connector && FPlatformProcess::SupportsMultithreading()) {
connector = new BluetoothConnector();
}
}
//Stop the thread
void BluetoothConnector::Stop() {
stopTaskCounter.Increment();
}
//Ensure that the thread stop
void BluetoothConnector::EnsureCompletion() {
closesocket(bluetoothSocket);
closesocket(connected);
Stop();
thread->WaitForCompletion();
}
//Shut the thread down
void BluetoothConnector::shutdownThread() {
if(connector) {
connector->EnsureCompletion();
delete connector;
connector = NULL;
}
}
Guys, I´m totally crazy with this. Iwas trying to implement this classes for read a heart rate monitor and put inside a Hud in UE4 but! I don´t know how can I do. Could you try to explain it to me like a dumb? Thanks a lot
Hi I used a polar heart rate monitor connected to an arduino.
I used the ue4duino plugin and was able to bring the bpm into the main blueprint.
I passed this bpm variable in realtime into a HUD created in the UI design component within unreal (I forget the name of the UI designer).I tried several monitors with arduino but the polar was the most reliable but the user will need to be wirhin 2 metres of the arduino receiver. Hope this helps.
I don´t really know where the proble is and I don´t know how can i solve it because I was tryng to use your code but I´m a noob so I don´t really know what kind of component I need to create into my unreal to fix it.
Why do you need to conect it to an arduino hardw? Could you explain it to me? Probabilly I could try to fix with this method but if I do an arduino BLE reciever I think that I will have so many devices. Right?
Hi, I copied your code to vs2015 and compiled it, then call BluetoothConnector :: joyInit () on the blueprint, but “Output Log” prints only LogTemp: Waiting for incoming connection, which has not been connected successfully. It I was running, always with my phone connected to the computer Bluetooth.
Hi @Kosren, I know it’s been a couple of years since this post was active but would you be able to give me any pointers on whats causing the errors in your code? I can’t seem to get it working at all.
Thanks a lot