"where can i find the hexcodes for the umlauts and the esszet?"
sprintf("%lx",ord('X')); # That's an ell, not a one.
That should give you the hex value of the character 'X'.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.