Read integer inside a string

Projects Programming
1

I thing that my problem is already resolved in forum ... by i search and not find anything .Perhaps exist somewhere... ut where?

So ... I have

String b="";

 while(f.available()) {
  b +=f.read();
}
 f.close();

So read file into b string

file contain gcode same :

G01 X100.123 Y200.345\nG01 X234.100 Y432.654\n .... ecc

So with indexOf i can find index of first X but i dont know how read integer value

int x= b.indexOf('X');
int y=b[x].toInt();

give me a error:

'b.String::operator[](((unsigned int)x))', which is of non-class type 'char'

y will need be 100.123

Any help or topic?
Regards!

2

So read file into b string

That is NOT what that code does. There is a HUGE difference between a string (that you should be using) and a String (that you should avoid like the plague).

b[ x ] IS a char. You can't convert a char to an int.

Look up the substring() method.

3

I see now and i thing that i need a string ... not a integer...

Because i try to finished a wifi gcodesender...

I create a html page that transform a jpg image to gcode

over wifi send gcode file to SPIFFS esp8285 that is connected to cnc

With esp8255 transfer file to a variable string , and after ...

send line by line to gcode interpreter .

When read a line ,send this line to gcode interpreter routine , but in same time

send to client a response 100 continue with a svg file with line segments...

in this mode i can see "live" where cnc cutting position.

For this substring routine is ok for me ... i study that!

Thanks!