Updating UTFT Button

Projects Programming
1

I'm trying to code a button on my touch screen that reads the time, but can also be touched and bring you to an edit time screen.

My code is fairly simple so far. imported UTFT libraries and Time.h and then only have this function running in the loop right now:

void drawToolbar() {
  
  //Top Bar
  mainDisplay.setColor(VGA_GRAY);
  mainDisplay.fillRoundRect(0,0,319,28);
  
  homeButton     = inputButtons.addButton(   1, 212,  80, 26, "9", BUTTON_SYMBOL);
  settingsButton = inputButtons.addButton(  81, 212,  79, 26, "w", BUTTON_SYMBOL);
  alertButton    = inputButtons.addButton( 160, 212,  79, 26, "W", BUTTON_SYMBOL);
  powerButton    = inputButtons.addButton( 239, 212,  80, 26, "4", BUTTON_SYMBOL);
  timeButton     = inputButtons.addButton( 160,   1, 158, 26, 34, "MM/DD/YYYY" + hour() + ":" + minute() );
  
  inputButtons.drawButtons();
}

But I keep getting this error:

Toolbar.ino: In function 'void drawToolbar()':
Toolbar.ino:11:91: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'

Can anyone help me out with this? Right now I simply want it to print the current time out. Once I get that, I'll work on having it constantly update without redrawing the whole screen each second.

I'm working on a Due

Thanks!

2

"MM/DD/YYYY" + hour() + ":" + minute() This is not how you concatenate string constants and numbers. You could use sprintf() to do the concatenation into a NULL terminated char array before using it in the button function.

3

Thanks, that ended up working:

char t [17];
  int j = sprintf (t, "%02u/%02u/%u %02u:%02u", month(), day(), year(), hour(), minute());
  
  timeButton     = inputButtons.addButton( 160,   1, 158, 26, t);

Though it is doing something funny. If I create the button and immediately print it out, it shows up fine, but if I call the drawButtons(); function further down the line in a different function, it appears all blurred and distorted. Maybe another button in the array is interfering? It doesn't affect any other buttons.