Error compiling EthernetWebServer

Projects Programming
1

Hello,
i am using the EthernetWebServer library to connect my ESP32S3 to the net using W5500.
When i compile my code, which is written using Arduino IDE, i get the following error message:

h:\Documents\Arduino\libraries\EthernetWebServer-2.4.1\src/EthernetWebServer.hpp:576:25: error: cannot declare field 'EthernetWebServer::_server' to be of abstract type 'EthernetServer'
  576 |     EthernetServer      _server;
      |                         ^~~~~~~
h:\Documents\Arduino\libraries\Ethernet_Generic-2.8.1\src/Ethernet_Generic.hpp:532:7: note:   because the following virtual functions are pure within 'EthernetServer':
  532 | class EthernetServer : public Server

I have change the virtual function in Server.h from:

virtual void begin(uint16_t port=0) =0;

to:

void begin() {};

No success.
I searched in the net for this issue but almost all what i got are recommendations to change the Server.h (what i already did).
Is there any other reason for this or other solution?

2

If you look at the github site for the library, you will notice it is NOT for the ESP8266/ESP32.

This is simple yet complete WebServer library for AVR, AVR Dx, Portenta_H7, Teensy, SAM DUE, SAMD21/SAMD51, nRF52, STM32, RP2040-based, etc. boards running Ethernet shields. The functions are similar and compatible to ESP8266/ESP32 WebServer libraries to make life much easier to port sketches from ESP8266/ESP32.

You need to use a library designed for the ESP32.

3

Thank you for your reply.
I already had managed to use this library and has established a connection successfully.
After that i have worked on Modbus and successfully made it work.
Now i want to modify my code but for some unknown reason the old unchanged code does not work now.
The only chanfe i made was to update the libraries through arduino ide.

4

And the solution is:
changing the Server.h file in the updated library:
C:\Users\username\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.0-alpha3\cores\esp32
from

virtual void begin(uint16_t port=0) =0;

to:

void begin() {};

Note that Server.h folder my vary from one to another.
For other may be:
C:\Program Files (x86)\Arduino\hardware.......\esp32

Thank you for your reply.

5

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