Drawing random PNG images from SD problem

AndyT

How do i get this code to work
this works :
M5.Lcd.drawPngFile(SD,"/Image8.PNG", 0, 0); // display splash screen
but
M5.Lcd.drawPngFile(SD,PngName, 0, 0); // display splash screen
does not in code below.
I want to generate a random slide show

   int Arand=random(11);
  String PngName="/Image"+ String (Arand)+".PNG";
  Serial.println (PngName);
   M5.Lcd.drawPngFile(SD,(PngName), 0, 0); // display splash screen

felmue

Hi @AndyT

AFAIK drawPngFile() expects a pointer to a character array as path name and not a String. Just curious, does your code compile w/o error?

I think something like this should work:

M5.Lcd.drawPngFile(SD, PngName.c_str(), 0, 0);

Thanks
Felix

AndyT

Cheers Felix,
No it did not compile without errors before. But adding .c.str() solved it .
Thank you again

felmue

Hello @AndyT

you are welcome. Glad to hear it works now.

Cheers
Felix