display stored string using 8uglib

Other Hardware Displays
1

Hi,
im kind of a newbie on arduino and i need help from experts :stuck_out_tongue:

I've been able to display pretty much what i want on my GLCD TF7565 using th u8glib library. I'm able to display a string using this commande

u8g.drawStr(0, 0, "hello world");

but i want to display a double that i converted to a string but when i do something like this:

String testString;
//code puting a double value in testString
//...
//...
u8g.drawStr(0, 0, testString);

the program is giving me an error while compiling, it says:

no matching function for call to 'U8GLIB_LM6059::drawStr(int,int,String&)

im i doing something wrong or its just impossible to display a previously stored String using the u8glib library ?

Thank you !

2

I assume, that you need to convert the String object to a character array before passing it to drawStr.
Use toCharArray() - Arduino Reference.

Oliver

3

I just tried it and its working Thank you so much !!!!

4

glcd includes overloaded functions to handle all the string types.
For String it uses an overloaded wrapper function to handle it.
For u8g, It would be something like:

u8g_uint_t U8GLIB::drawStr(u8g_uint_t x, u8g_uint_t y, String &str )
{
   return( drawStr(x, y, str));
}

--- bill