Need a bit of help on server.on & handleUpload.

[HenkHoldijk]

Hi,

I was having a rough time, moving my server.on handlers into a class. Finally I managed (still do not know for 100% what I'm exactly doing) and now I'm left with only one handler, for upload, and I can't get it to compile (not talking about working yet). So I really could use a bit of help to get into the testing and debug phase. I create an example that shows the issue (see attachment).

test11c.txt

The problem is with the line:
server.on("/Upload", HTTP_POST, [](AsyncWebServerRequest *request) {
request->send(200);
}, std::bind(&MyClass::handleUpload, this, std::placeholders::_1));

I'm having arguments too many (it says) but likely I'm missing some arguments or using a wrong type of argument (see attachment).

error.txt

I'm using:

• Arduino IDE 2.3.5
• ESPAsyncWebServer 3.7.7
• ESP32C3 Super Mini

So if someone with some better C++ Voodoo can please give me a hand ...

Cheers, Henk

[mathieucarbou]

Hi,
Did you read the doc and look at the project examples ?

[mathieucarbou]

Did you read the doc and look at the project examples ?

https://github.com/ESP32Async/ESPAsyncWebServer/blob/main/examples/Upload/Upload.ino

[HenkHoldijk]

Yes, and I definitely looked at this one (please read the text below). Like I wrote before (so, that is the text below) the upload itself is not an issue at all. But I really want the upload handler to be part of a class. I don't see that in the example you mention (Upload.ino). Please have a look to test11c.txt and you will understand what I'm trying to accomplish.

[mathieucarbou]

the upload itself is not an issue at all.

yes it is: you are crafting a response during the parsing phase of the request, and overriding it by a 200 OK once the request is parsed.

[mathieucarbou]

Also, try to simplify your code. You have a mix of class usage / static calls with high coupling - that's error-prone and hard to read and follow. Probably reworking that will solve your issue.

[HenkHoldijk]

Hi Mathieu,

I have looked at the "Setup global and class functions as request handlers", which you are likely
referring to, but I don't think that is what I'm looking for. It seems to create a second server or a
second listener and I have several more classes that also have several more handlers that, I think,
should be handled with the same server or at least listen to the same port. I have looked at all the
examples given here, but there is none that uses a class Method / Function as a handler. I have all
the other handlers (that are also Methods in a class) perfectly working. I'm just stuck with the
upload. I'm missing something and I just can't figure out what. The upload itself, if removed from
the class, is also perfectly working. I'm just trying to make it a member of a larger class, where the
web handling is only a smaller part of it's (the class it's) purpose.

So I looked at the documentation, looked at at least 50+ more examples on the internet, tried even
much more possible solutions, took the time to isolate the problem and would not waist your or
anybody else’s time without me running out of options. I have either not found a solution, I did not
recognize the solution, or the "structure" / my approach is totally wrong.

So, could you please point me into the right direction?

Cheers, Henk