ESP8266 Community Forum

- Sat Feb 18, 2017 7:00 pm #62751 Hi,
I'm loading HTML pages to the client from an SD card. It works with client.write(myFile.read()); fine but there is a lag in performance so I implemented loading the file by chunks rather than one byte at a time. I've done with on an Arduino fine but it won't compile for the ESP8266. I can't figure out the problem.

Code: Select all        byte tBuf[64];
        unsigned int lastPosition = 0;
       
        File myFile = SD.open(page);        // open web page file
        if (myFile) {
             // send a standard http response header
             client.println(F("HTTP/1.1 200 OK"));
         
             if(webParser.contains(page, ".jpg")){
               client.println(F("Content-Type: image/jpeg"));
               client.println(F("Cache-Control: max-age=36000, public")); 
             } else if(webParser.contains(page, ".gif")){
               client.println(F("Content-Type: image/gif"));
               client.println(F("Cache-Control: max-age=36000, public"));
             } else if(webParser.contains(page, ".png")){
               client.println(F("Content-Type: image/png"));
               client.println(F("Cache-Control: max-age=36000, public"));
             } else if(webParser.contains(page, ".htm")){
               client.println(F("Content-Type: text/html"));
             } else if(webParser.contains(page, ".js")){
               client.println(F("Content-Type: application/javascript"));
             } else if(webParser.contains(page, ".css")){
               client.println(F("Content-Type: text/css"));
             }

             client.println();   
       
           while(myFile.available())
            {
               myFile.read(tBuf,64);
               client.write(tBuf, myFile.position() - lastPosition);
               lastPosition = myFile.position();
             
              //yield for esp8266 processes
              yield();
              //multiple bytes doesn't work for esp8266
              //client.write(myFile.read());
   
             }
             
            myFile.close();
             // disconnect the SD card


Here's the error

Code: Select alln file included from /Users/minh/Library/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266WiFi/src/ESP8266WiFi.h:39:0,
                 from /Users/minh/Documents/Arduino_esp8266/ESP8266_WAAC_WebServer/ESP8266_WAAC_WebServer.ino:6:
/Users/minh/Library/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266WiFi/src/WiFiClient.h: In instantiation of 'size_t WiFiClient::write(T&, size_t) [with T = unsigned char [64]; size_t = unsigned int]':
/Users/minh/Documents/Arduino_esp8266/ESP8266_WAAC_WebServer/ESP8266_WAAC_WebServer.ino:201:67:   required from here
/Users/minh/Library/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266WiFi/src/WiFiClient.h:123:36: error: request for member 'available' in 'source', which is of non-class type 'unsigned char [64]'
     size_t left = source.available();
                                    ^
/Users/minh/Library/Arduino15/packages/esp8266/hardware/esp8266/2.3.0/libraries/ESP8266WiFi/src/WiFiClient.h:127:5: error: request for member 'read' in 'source', which is of non-class type 'unsigned char [64]'
     source.read(buffer.get(), will_send);
     ^