multiple definition of `websockets2_generic::WebsocketsServer::~WebsocketsServer()' in websocket2_generic library #3

pchan1401-ICIL · 2020-09-17T02:38:20Z

HI.

I’m using ‘adafruit feather m0’ board with w5500 and I succeed to run example code “SAMD-Ethernet-Client”. Also, I communicate server using websocket2_generic library. Then I want to separate code into two files.

While I was trying to make separate WebSocket header file using websockets2_generic library, I face weird error. I try to figure out it, but It was very complicated with my codes. Thus, I remove all of my code except necessary things such as “#define” and “#include”.

I have four files which is

SAMD-Ethernet-Client.ino
EthernetWebSocketsClient.h
EthernetWebSocketsClient.cpp
defines.h

As the file name, I use the example code. defines.h is almost same with example code. I just remove unnecessary global values.
Other files are same below.

SAMD-Ethernet-Client.ino

#include "EthernetWebSocketsClient.h"
    
void setup()
{}
    
void loop()
{}

EthernetWebSocketsClient.h

#ifndef EWC_H
#define EWC_H
    
#include "defines.h"
#include <WebSockets2_Generic.h>
     
#endif

EthernetWebSocketsClient.cpp

#include "EthernetWebSocketsClient.h"

As I mentioned before, I remove all the code. Those are the full code. When compiling, it shows error like below

c:/users/chanyoung/appdata/local/arduino15/packages/adafruit/tools/arm-none-eabi-gcc/9-2019q4/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\CHANYO1\AppData\Local\Temp\arduino_build_4918\sketch\SAMD-Ethernet-Client.ino.cpp.o: in function std::function<void (websockets2_generic::WebsocketsClient&, websockets2_generic::WebsocketsMessage)>::operator bool() const': C:\Arduino\libraries\WebSockets2_Generic-master\src/Tiny_Websockets_Generic/internals/wscrypto/sha1.hpp:73: multiple definition of websockets2_generic::WebsocketsServer::~~WebsocketsServer()'; C:\Users\CHANYO~~1\AppData\Local\Temp\arduino_build_4918\sketch\EthernetWebSocketsClient.cpp.o:C:\Arduino\libraries\WebSockets2_Generic-master\src/WebSockets2_Generic_Server.hpp:182: first defined here
c:/users/chanyoung/appdata/local/arduino15/packages/adafruit/tools/arm-none-eabi-gcc/9-2019q4/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\CHANYO1\AppData\Local\Temp\arduino_build_4918\sketch\SAMD-Ethernet-Client.ino.cpp.o: in function std::function<void (websockets2_generic::WebsocketsClient&, websockets2_generic::WebsocketsMessage)>::operator bool() const': C:\Arduino\libraries\WebSockets2_Generic-master\src/Tiny_Websockets_Generic/internals/wscrypto/sha1.hpp:73: multiple definition of websockets2_generic::WebsocketsServer::~~WebsocketsServer()'; C:\Users\CHANYO~~1\AppData\Local\Temp\arduino_build_4918\sketch\EthernetWebSocketsClient.cpp.o:C:\Arduino\libraries\WebSockets2_Generic-master\src/WebSockets2_Generic_Server.hpp:182: first defined here
c:/users/chanyoung/appdata/local/arduino15/packages/adafruit/tools/arm-none-eabi-gcc/9-2019q4/bin/../lib/gcc/arm-none-eabi/9.2.1/../../../../arm-none-eabi/bin/ld.exe: C:\Users\CHANYO~1\AppData\Local\Temp\arduino_build_4918\sketch\SAMD-Ethernet-Client.ino.cpp.o: in function `websockets2_generic::WebsocketsServer::~WebsocketsServer()':

It shows multiple definition.

I change codes in EthernetWebSocketsClient.h, SAMD-Ethernet-Client.ino.

SAMD-Ethernet-Client.ino

#ifndef EWC_H
#define EWC_H
    
#endif

SAMD-Ethernet-Client.ino

#include "defines.h"
#include <WebSockets2_Generic.h>
    
#include "EthernetWebSocketsClient.h"

void setup()
{}
    
void loop()
{}

I just change the location of

#include "defines.h"
#include <WebSockets2_Generic.h>

Then, I succeed to compile and linking.

I want to implement websocket functions in EthernetWebSocketsClient.cpp file. Thus, EthernetWebSocketsClient.h include websocket2_generic library.

How can I include websocket2_generic library in EthernetWebSocketsClient.h file.

The text was updated successfully, but these errors were encountered:

khoih-prog · 2020-09-17T06:12:42Z

@pchan1401-ICIL

Thanks for using the library. The problems you experienced happened because the complicated feature of the libraries.

You can use either solutions as follows:

1. Better implementation

SAMD-Ethernet-Client.ino
EthernetWebSocketsClient.h
EthernetWebSocketsClient_Impl.h
defines.h

SAMD-Ethernet-Client.ino

#include "defines.h"

#include <WebSockets2_Generic.h>

#include "EthernetWebSocketsClient.h"

using namespace websockets2_generic;

void setup()
{}
    
void loop()
{}

EthernetWebSocketsClient.h

#ifndef EWC_H
#define EWC_H

#include "EthernetWebSocketsClient_Impl.h"    
     
#endif

EthernetWebSocketsClient_Impl.h

#ifndef EWC_Impl_H
#define EWC_Impl_H

     
#endif

2. Another implementation

SAMD-Ethernet-Client.ino
EthernetWebSocketsClient.h
EthernetWebSocketsClient.cpp
defines.h

SAMD-Ethernet-Client.ino

#include "defines.h"

#include <WebSockets2_Generic.h>

#include "EthernetWebSocketsClient.h"

using namespace websockets2_generic;

void setup()
{}
    
void loop()
{}

EthernetWebSocketsClient.h

#ifndef EWC_H
#define EWC_H
    
     
#endif

EthernetWebSocketsClient.cpp

#include "EthernetWebSocketsClient.h"

If you are OK with any implementation, please post the result for other people to follow.
It's complicated to explain all, it's better for you to research why if OK.

khoih-prog · 2020-09-17T06:14:50Z

This is the terminal output when running the same example on SAMD21 SeeedStudio XIAO Mo


Starting WebSockets2_Generic SAMD-Ethernet-Client on SEEED_XIAO_M0
Ethernet using W5x00 and Ethernet Library
[SETUP] BOOT WAIT 2
[SETUP] BOOT WAIT 1
_pinCS = 0
W5100 init, using SS_PIN_DEFAULT = 10, new ss_pin = 10, W5100Class::ss_pin = 1
W5100::init: W5500, SSIZE =4096
WebSockets Client IP address: 192.168.2.126
Connecting to WebSockets Server @192.168.2.81
[WS] WebsocketsClient::generateHandshake: base64Authorization = 
[WS] WebsocketsClient::generateHandshake: handshake = GET / HTTP/1.1
Host: 192.168.2.81
Sec-WebSocket-Key: MDEyMzQ1Njc4OWFiY2RlZg==
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Version: 13
User-Agent: TinyWebsockets Client
Authorization: Basic 
Origin: https://github.com/khoih-prog/Websockets2_Generic


[WS] WebsocketsClient::connect: base64Authorization = 
[WS] WebsocketsClient::doestStartsWith: str = HTTP/1.1 101 Switching Protocols

[WS] WebsocketsClient::doestStartsWith: prefix = HTTP/1.1 101
[WS] WebsocketsClient::generateHandshake: key = Connection
[WS] WebsocketsClient::generateHandshake: value = Upgrade
[WS] WebsocketsClient::generateHandshake: key = Upgrade
[WS] WebsocketsClient::generateHandshake: value = websocket
[WS] WebsocketsClient::generateHandshake: key = Sec-WebSocket-Version
[WS] WebsocketsClient::generateHandshake: value = 13
[WS] WebsocketsClient::generateHandshake: key = Sec-WebSocket-Accept
[WS] WebsocketsClient::generateHandshake: value = BACScCJPNqyz+UBoqMH89VmURoA=
Connnection Opened
Connected!
Got Message: Echo: Hello to Server from SEEED_XIAO_M0
Connnection Closed

pchan1401-ICIL · 2020-09-17T06:47:45Z

Thank you for offering nice library.
but your answer is slightly way off with my expection.

I'm using folder named SAMD-Ethernet-Client
In this folder there are four files.

SAMD-Ethernet-Client.ino
EthernetWebSocketsClient.h
EthernetWebSocketsClient.cpp
defines.h

I want to use library in EthernetWebSocketsClient.h not SAMD-Ethernet-Client.ino file.

Thus, "#include <WebSockets2_Generic.h>" should in EthernetWebSocketsClient.h

Putting "#include <WebSockets2_Generic.h>" into .ino file is successful. Also, I already run the examlpe code with my board. In addition, I succed to connect websocket server.

However, I want to make saperate file EthernetWebSocketsClient.h which using websocket library for code management.

For more easy explanation. Here is an example.

EthernetWebSocketsClient.h

#ifndef EWC_H
#define EWC_H

#include "defines.h"
#include <WebSockets2_Generic.h>

using namespace websockets2_generic;

class EWCTest
{
 public :
  void init();
 private :
  WebsocketsClient client;
};

#endif

Thank you for your reply.

khoih-prog · 2020-09-17T20:21:01Z

You can use this solution as follows:

SAMD-Ethernet-Client.ino
EthernetWebSocketsClient.h
EthernetWebSocketsClient_Impl.h
defines.h

SAMD-Ethernet-Client.ino

#include "EthernetWebSocketsClient.h"

using namespace websockets2_generic;

void setup()
{}
    
void loop()
{}

EthernetWebSocketsClient.h

#ifndef EWC_H
#define EWC_H

#include "defines.h"
#include <WebSockets2_Generic.h>

using namespace websockets2_generic;

class EWCTest
{
 public :
  void init();
 private :
  WebsocketsClient client;
};

#include "EthernetWebSocketsClient_Impl.h"

#endif

EthernetWebSocketsClient_Impl.h

#ifndef EWC_Impl_H
#define EWC_Impl_H

     
#endif

pchan1401-ICIL · 2020-09-17T23:52:39Z

It works

Thaks a lot.

But what is the reason it makes error with ".cpp" file?

khoih-prog · 2020-09-17T23:55:40Z

That's left for you to research and investigate.

Thanks for confirming the solution.

pchan1401-ICIL · 2020-09-17T23:56:05Z

Thank you for your reply

khoih-prog closed this as completed Sep 17, 2020

khoih-prog added the Support Library support label Sep 17, 2020

khoih-prog mentioned this issue Oct 8, 2020

Fixed linker errors when included in multiple .cpp files khoih-prog/AsyncHTTPRequest_Generic#1

Closed

OOHehir mentioned this issue Apr 14, 2021

multiple definition of `websockets2_generic::WebsocketsServer::....' #15

Closed

khoih-prog mentioned this issue May 21, 2021

Linker error khoih-prog/Timezone_Generic#4

Closed

VladimirGaristov mentioned this issue Jun 2, 2021

Multiple definition errors due to non-standard naming convention #21

Closed

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multiple definition of `websockets2_generic::WebsocketsServer::~WebsocketsServer()' in websocket2_generic library #3

multiple definition of `websockets2_generic::WebsocketsServer::~WebsocketsServer()' in websocket2_generic library #3

pchan1401-ICIL commented Sep 17, 2020 •

edited

khoih-prog commented Sep 17, 2020

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020 •

edited

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020

multiple definition of `websockets2_generic::WebsocketsServer::~WebsocketsServer()' in websocket2_generic library #3

multiple definition of `websockets2_generic::WebsocketsServer::~WebsocketsServer()' in websocket2_generic library #3

Comments

pchan1401-ICIL commented Sep 17, 2020 • edited

khoih-prog commented Sep 17, 2020

1. Better implementation

2. Another implementation

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020 • edited

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020

khoih-prog commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020

pchan1401-ICIL commented Sep 17, 2020 •

edited

pchan1401-ICIL commented Sep 17, 2020 •

edited