Write to stream with ESP8266HTTPClient.h library

Projects Programming
1

Dear comunity please tell me what is wrong with it code.
I am using esp8266 mcu. HTTP request ends ok, but how can i save the file.
Method "writeToStream" of HTTPClient class work good with 'Serial' stream but returns negative (as we know it is error) while writes to file stream.

    void loop() {

    File file;
    // wait for WiFi connection
    if ((WiFiMulti.run() == WL_CONNECTED)) {

    WiFiClient client;
    HTTPClient http;

    Serial.print("[HTTP] begin...\n");
    file = LittleFS.open("/bin.bin", "w+");
    
    if (http.begin(client, "http://mcu-bin-upd.000webhostapp.com/example.bin")) {  // HTTP

      http.collectHeaders(headerKeys,numberOfHeaders);
      
      Serial.print("[HTTP] GET...\n");
      // start connection and send HTTP header
      int httpCode = http.GET();

      // httpCode will be negative on error
      if (httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        Serial.printf("[HTTP] GET... code: %d\n", httpCode);

        // file found at server
        if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
          
          Serial.printf("My header 2/%d\n", http.headers());

          if(http.hasHeader("Content-type")){
            Serial.printf("Content-type: %s \n", http.header("Content-type").c_str());            
            }
          
          if(http.hasHeader("Content-length")){
            int bytesWritten;           
            int contLen = http.header("Content-length").toInt();
            Serial.printf("Content-length: %d \n", contLen);
              if(file){
                bytesWritten = http.writeToStream(&Serial);
                Serial.print("\n");
                Serial.printf("Stream.Serial written bytes: %d\n", bytesWritten);                
                bytesWritten = http.writeToStream(&file);
                Serial.printf("Stream.file written bytes: %d\n", bytesWritten);              
                } else {
                  Serial.print("The file not opened. \n");
                  }            
            }
                         
        }
        file.close();
      } else {
        Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
      }

      http.end();
    } else {
      Serial.printf("[HTTP} Unable to connect\n");
    }//if (http.begin...

    file.close();
    }

    delay(20000);
    }

Mount LittleFS
Listing directory: /
  FILE: bin.bin  SIZE: 0    CREATION: 1970-01-01 00:00:07
  LAST WRITE: 1970-01-01 00:00:00
[SETUP] WAIT ...
[HTTP] begin...
[HTTP] GET...
[HTTP] GET... code: 200
My header 2/2
Content-type: application/octet-stream 
Content-length: 20 
(edited by me. below is my file content. it's ok)
яяяя[00][00][00][00][01][02][03][04][05][06][07][08][05][05][05][05]
Stream.Serial written bytes: 20
Stream.file written bytes: -10
2

It's not complete. Experience shows that in most cases the error is in that part of the code people are hiding from us. Post always complete code!

If you write the content to the Serial interface the bytes are consumed and cannot be written to the file afterwards (if I got your intention correctly).

1 Like
3

Thank you much for Your answer. Now i am not ready to post full code because it no more exists.
I am sure there was my kiddy mistake in the code but not in the place You show. First time no print to 'Serial' was used.
Finally i use another tip from web to save from HTTP to filesystem.

4

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