Converting Hex color to uint_16

scientiffic

I'm trying to use the fillScreen() method for the LCD, which expects a color in uint_16.

I'm currently fetching the color as a a HEX via a GET request to a service, which is returning a String value such as "#ff0000"

I need to convert the string value from the GET request into a uint_16 so that I can set the color.

uint16_t color = (uint16_t) strtol(http.getString(), NULL, 16);

Which gives me the error

cannot convert 'String' to 'const char*' for argument '1' to 'long int strtol(const char*, char**, int)'

Any recommended way to generate the uint_16 color from a HEX string?

m5stack

@scientiffic Hi， you could use this web tool to convert it

ajb2k3

Check out W3Schools as they have tables for the multiple colour systems and codes used on the web.

FF0000 = 255.0.0