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How to use getWebServerPtr to reuse fileManager WebServer ? #15

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g1ra opened this issue Feb 2, 2025 · 2 comments
Open

How to use getWebServerPtr to reuse fileManager WebServer ? #15

g1ra opened this issue Feb 2, 2025 · 2 comments

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@g1ra
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g1ra commented Feb 2, 2025

I'm trying to use fileManager for other purpose , but I'm getting lost with how to use the pointer . Can you help ?
It have something to do with "lambda expression". .. idk

  WebServer *ws = filemgr.getWebServerPtr();

  ws->on("/f", []() {
    ws->setContentLength(CONTENT_LENGTH_UNKNOWN);
    String res = "";
    res->reserve(CTRLASSIST_STREAM_CHUNKSIZE);
    while (ctrl.getHtmlChunk(res)) {
      ws->sendContent(res);
    }
  });

Error :

src/UV_Timer_v4.cpp:836:5: error: 'ws' is not captured
     ws->setContentLength(CONTENT_LENGTH_UNKNOWN);
     ^~
src/UV_Timer_v4.cpp:835:26: note: the lambda has no capture-default
   ws->on("/d", [WebServer]() {
                          ^
src/UV_Timer_v4.cpp:823:14: note: 'WebServer* ws' declared here
   WebServer *ws = filemgr.getWebServerPtr();
              ^~
@g1ra
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g1ra commented Feb 2, 2025 •
edited
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fixed by passing ws to lambda fn scope
in my crude understanding , I have to pass ws variable to a lambda function to be available in that scope .
http://www.cprogramming.com/c++11/c++11-lambda-closures.html

correct code is :

  WebServer *ws = filemgr.getWebServerPtr();

  ws->on("/f", [ws]() {
    ws->setContentLength(CONTENT_LENGTH_UNKNOWN);
    String res = "";
    res.reserve(CTRLASSIST_STREAM_CHUNKSIZE);
    while (ctrl.getHtmlChunk(res)) {
      ws->sendContent(res);
    }
  });

Now another problem arise , that the IPADDR/f returns the HTML content in <body><pre>

instead of running like did it before . I'm trying to serve https://github.com/gemi254/ControlAssist-ESP32-ESP8266

@holgerlembke
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No sure what I need to help here...

For lambdas, it might become clearer if you do not use a lambda but a traditional approach with a function here. That should show what is needed to pass into the lambda. (that said, early in the morning without enough coffee.)

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@g1ra @holgerlembke