Expected unqualified-id before '->' token

shanren · January 8, 2023, 1:53am

Hi everyone.
The sketch got error of: expected unqualified-id before '->' token
how to fix please?
Thanks
Adam

TFT_eSPI display;

int gpsDataBJ = 1;


void setup()
{
  Serial.begin(115200);

  display.begin();
  display.setRotation(1);
  display.fillScreen(0);
  display.setCursor(0, 0, 2);
  display.setTextColor(TFT_WHITE, TFT_BLACK);
  display.setTextSize(1);

///  gps = new GPS(GPS_SERIAL, GPS_TX, GPS_RX);
  GPS->begin(GPS_BAUD);

}

void loop()
{
  Serial.printf("%s\n", GPS->get_fix().toString().c_str());
  if (int gpsDataBJ == 1 ) {
    display.fillScreen(0);
    display.setCursor(0, 0, 2);
    Serial.printf(GPS->get_fix().toString().c_str());
    display.println(GPS->get_fix().toString().c_str());
    display.fillScreen(0);
    display.setCursor(0, 0, 2);
    display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());
    display.printf("Status: %s\n", GPS->get_status() == 'A' ? "LOCK!" : "SEARCHING...");
    display.printf("Time: %s\n", GPS->get_fix().timestamp.toString().c_str());
    display.printf("Lat: %f\n", GPS->get_fix().latitude);
    display.printf("Lng: %f\n", GPS->get_fix().longitude);
    display.printf("Speed: %f\n", GPS->get_fix().speed);
    display.printf("Almanac: %.1f%% complete\n", GPS->get_fix().almanac.percentComplete());
  }
  delay(5000);
}

ERROR:

Arduino: 1.8.19 (Windows 7), Board: "TTGO LoRa32-OLED V1, 40MHz, 921600, None"


C:\Users\HUA.DELLV-PC\Documents\Arduino\sketch_jan07c\sketch_jan07c.ino: In function 'void setup()':

sketch_jan07c:24:6: error: expected unqualified-id before '->' token

   GPS->begin(GPS_BAUD);

      ^

C:\Users\HUA.DELLV-PC\Documents\Arduino\sketch_jan07c\sketch_jan07c.ino: In function 'void loop()':

sketch_jan07c:30:28: error: expected primary-expression before '->' token

   Serial.printf("%s\n", GPS->get_fix().toString().c_str());

                            ^

sketch_jan07c:31:7: error: expected primary-expression before 'int'

   if (int gpsDataBJ == 1 ) {

       ^

sketch_jan07c:31:7: error: expected ')' before 'int'

sketch_jan07c:34:22: error: expected primary-expression before '->' token

     Serial.printf(GPS->get_fix().toString().c_str());

                      ^

sketch_jan07c:35:24: error: expected primary-expression before '->' token

     display.println(GPS->get_fix().toString().c_str());

                        ^

sketch_jan07c:38:54: error: expected primary-expression before '->' token

     display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());

                                                      ^

sketch_jan07c:38:86: error: expected primary-expression before '->' token

     display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());

                                                                                      ^

sketch_jan07c:39:39: error: expected primary-expression before '->' token

     display.printf("Status: %s\n", GPS->get_status() == 'A' ? "LOCK!" : "SEARCHING...");

                                       ^

sketch_jan07c:40:37: error: expected primary-expression before '->' token

     display.printf("Time: %s\n", GPS->get_fix().timestamp.toString().c_str());

                                     ^

sketch_jan07c:41:36: error: expected primary-expression before '->' token

     display.printf("Lat: %f\n", GPS->get_fix().latitude);

                                    ^

sketch_jan07c:42:36: error: expected primary-expression before '->' token

     display.printf("Lng: %f\n", GPS->get_fix().longitude);

                                    ^

sketch_jan07c:43:38: error: expected primary-expression before '->' token

     display.printf("Speed: %f\n", GPS->get_fix().speed);

                                      ^

sketch_jan07c:44:53: error: expected primary-expression before '->' token

     display.printf("Almanac: %.1f%% complete\n", GPS->get_fix().almanac.percentComplete());

                                                     ^

exit status 1

expected unqualified-id before '->' token



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red_car · January 8, 2023, 2:26am

Looks like you are missing an include of the GPS library ? Probably one for the TFT display also.

You have already declared this variable so you don't need int again.

shanren · January 8, 2023, 2:45am

Thank you red_car.
I modified the two places and got the same error.

#include <TFT_eSPI.h>
#include <GPS.h>

TFT_eSPI display;

int gpsDataBJ = 1;


void setup()
{
  Serial.begin(115200);

  display.begin();
  display.setRotation(1);
  display.fillScreen(0);
  display.setCursor(0, 0, 2);
  display.setTextColor(TFT_WHITE, TFT_BLACK);
  display.setTextSize(1);

///  gps = new GPS(GPS_SERIAL, GPS_TX, GPS_RX);
  GPS->begin(GPS_BAUD);

}

void loop()
{
  Serial.printf("%s\n", GPS->get_fix().toString().c_str());
  if (gpsDataBJ == 1 ) {
    display.fillScreen(0);
    display.setCursor(0, 0, 2);
    Serial.printf(GPS->get_fix().toString().c_str());
    display.println(GPS->get_fix().toString().c_str());
    display.fillScreen(0);
    display.setCursor(0, 0, 2);
    display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());
    display.printf("Status: %s\n", GPS->get_status() == 'A' ? "LOCK!" : "SEARCHING...");
    display.printf("Time: %s\n", GPS->get_fix().timestamp.toString().c_str());
    display.printf("Lat: %f\n", GPS->get_fix().latitude);
    display.printf("Lng: %f\n", GPS->get_fix().longitude);
    display.printf("Speed: %f\n", GPS->get_fix().speed);
    display.printf("Almanac: %.1f%% complete\n", GPS->get_fix().almanac.percentComplete());
  }
  delay(5000);
}

Arduino: 1.8.19 (Windows 7), Board: "TTGO LoRa32-OLED V1, 40MHz, 921600, None"



C:\Users\HUA.DELLV-PC\Documents\Arduino\main_cpp_test\main_cpp_test.ino: In function 'void setup()':

main_cpp_test:27:6: error: expected unqualified-id before '->' token

   GPS->begin(GPS_BAUD);

      ^

C:\Users\HUA.DELLV-PC\Documents\Arduino\main_cpp_test\main_cpp_test.ino: In function 'void loop()':

main_cpp_test:33:28: error: expected primary-expression before '->' token

   Serial.printf("%s\n", GPS->get_fix().toString().c_str());

                            ^

main_cpp_test:37:22: error: expected primary-expression before '->' token

     Serial.printf(GPS->get_fix().toString().c_str());

                      ^

main_cpp_test:38:24: error: expected primary-expression before '->' token

     display.println(GPS->get_fix().toString().c_str());

                        ^

main_cpp_test:41:54: error: expected primary-expression before '->' token

     display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());

                                                      ^

main_cpp_test:41:86: error: expected primary-expression before '->' token

     display.printf("Tracking %d of %d visible\n", GPS->get_tracking_satellites(), GPS->get_visibile_satellites());

                                                                                      ^

main_cpp_test:42:39: error: expected primary-expression before '->' token

     display.printf("Status: %s\n", GPS->get_status() == 'A' ? "LOCK!" : "SEARCHING...");

                                       ^

main_cpp_test:43:37: error: expected primary-expression before '->' token

     display.printf("Time: %s\n", GPS->get_fix().timestamp.toString().c_str());

                                     ^

main_cpp_test:44:36: error: expected primary-expression before '->' token

     display.printf("Lat: %f\n", GPS->get_fix().latitude);

                                    ^

main_cpp_test:45:36: error: expected primary-expression before '->' token

     display.printf("Lng: %f\n", GPS->get_fix().longitude);

                                    ^

main_cpp_test:46:38: error: expected primary-expression before '->' token

     display.printf("Speed: %f\n", GPS->get_fix().speed);

                                      ^

main_cpp_test:47:53: error: expected primary-expression before '->' token

     display.printf("Almanac: %.1f%% complete\n", GPS->get_fix().almanac.percentComplete());

                                                     ^

exit status 1

expected unqualified-id before '->' token



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red_car · January 8, 2023, 2:48am

Where did you get that code?

Try using a "." instead of "->" in the function calls.

TomGeorge · January 8, 2023, 2:54am

Hi,
Can I suggest you forget the display for the moment and use one of the example codes that came with the GPS library and the IDE Monitor.
This is a good place to start, once you have good GPS readings, then think about your display.

The key here is to develop your code in stages to prove your hardware and interfacing code.

Thanks.. Tom..

shanren · January 8, 2023, 2:59am

I got the code here:

github.com

atomic14/esp32-gps/blob/main/src/main.cpp

#include "config.h"
#include <Arduino.h>
#ifdef ENABLE_DISPLAY
#include <TFT_eSPI.h>
#endif
#include "SiRFGPS.h"

#ifdef USES_SIRF
SiRFGPS *gps;
#else
GPS *gps;
#endif
#ifdef ENABLE_DISPLAY
TFT_eSPI display;
#endif

void setup()
{
  Serial.begin(115200);
#ifdef ENABLE_DISPLAY

This file has been truncated. show original

and changed "->" into "." and got new error:

Arduino: 1.8.19 (Windows 7), Board: "TTGO LoRa32-OLED V1, 40MHz, 921600, None"






C:\Users\HUA.DELLV-PC\Documents\Arduino\main_cpp_test\main_cpp_test.ino: In function 'void loop()':

main_cpp_test:33:25: error: 'GPS_get' was not declared in this scope

   Serial.printf("%s\n", GPS_get.fix().toString().c_str());

                         ^

main_cpp_test:37:22: error: expected primary-expression before '.' token

     Serial.printf(GPS.get_fix().toString().c_str());

                      ^

main_cpp_test:38:24: error: expected primary-expression before '.' token

     display.println(GPS.get.fix().toString().c_str());

                        ^

exit status 1

'GPS_get' was not declared in this scope



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red_car · January 8, 2023, 3:02am

Maybe because you put the "." in the wrong place?

GPS.get_fix()

shanren · January 8, 2023, 3:03am

Thanks.
I got the GPS reading already, and like to have the path shown on a map or even just a blank LCD.
I didn't find any GPS tracker example with display yet.

shanren · January 8, 2023, 3:07am

Thanks.
the GPS.get_fix() got error of:

Arduino: 1.8.19 (Windows 7), Board: "TTGO LoRa32-OLED V1, 40MHz, 921600, None"

C:\Users\HUA.DELLV-PC\Documents\Arduino\main_cpp_test\main_cpp_test.ino: In function 'void loop()':

main_cpp_test:33:28: error: expected primary-expression before '.' token

   Serial.printf("%s\n", GPS.get_fix().toString().c_str());

                            ^

main_cpp_test:37:22: error: expected primary-expression before '.' token

     Serial.printf(GPS.get_fix().toString().c_str());

                      ^

main_cpp_test:38:24: error: expected primary-expression before '.' token

     display.println(GPS.get_fix().toString().c_str());

                        ^

exit status 1

expected primary-expression before '.' token



This report would have more information with
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red_car · January 8, 2023, 3:23am

If you have already got the GPS working then please refer to the code that works to see what is different.

shanren · January 8, 2023, 3:34am

The difference is the code above that try to make path on a display.

alto777 · January 8, 2023, 3:38am

Are you still commenting out

///  gps = new GPS(GPS_SERIAL, GPS_TX, GPS_RX);

?

a7

red_car · January 8, 2023, 3:47am

Nonsense… it is complaining about the GPS code… READ the error.

system · July 7, 2023, 3:48am

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