part of code appended into string, resulting in very strange serial output

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johnwasser:
I think this line is part of your problem:

  String charFilename = currentChar + ".tmp";

Since your printout shows currentChar == 'A' I think you are getting:

  String charFilename = &".tmp"+65;

Since ".tmp" is only 5 bytes long and you are starting at the 66th byte I expect you will get something unexpected.

You can't concatenate a character and a character string. Try this instead:

  String charFilename = currentChar;

charFilename += ".tmp";






I'm not sure that is the only mistake since many of the variable are not declared.

Thank you! i realise strings in arduino and andriod are a little different. and did the concat one at a time. its working now.

String tmpFilename = customTextPath + font;
		tmpFilename += "/";
		tmpFilename += currentChar;
		tmpFilename += ".tmp";
		Serial.print(F("tmpFilename: "));Serial.println(tmpFilename);
		
		tmpFilename.toCharArray(infile, 20); 
		Serial.print("printChar: infile:");Serial.println(infile);