MMB MX4, VTFT and MP32

[janni]

Well, concatenation with + seems to work well (at least in simulator) and I see two problems in your code. First, the FloatToStr procedure requires a string of at least 11 chars (plus terminating char). Help examples notwithstanding .
Whatever follows the string parameter in memory will have first byte (or more, for large numbers) overwritten, if the string is declared as string[10].

Second, when forming temp_str, there's no terminating char added, so concatenation can go wrong depending on what was previously held in memory space assigned to temp_str. This goes with your description

The space between celcius appear ok the first time, after the second press of the button, or the pic freeze or random char appear in the space...

Note also that changing code frequently means rearranging variables in RAM, so while your code runs now, it may stop again after another change.

Please try to correct your code by declaring tmp_str as string[11] and adding terminating char to temp_str after copying first four chars from tmp_str (temp_str[4]:=0;), and it should work with both concatenation ways.

BTW,

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strcat2(ButtonRound1_Caption,temp_str,' Celcius');

is not functionally equivalent to

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ButtonRound1_Caption := ButtonRound1_Caption + temp_str + ' Celcius';

but rather to

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ButtonRound1_Caption := temp_str + ' Celcius';

That's probably a mistake while you tried to restore the old code, but I thought it'd be better to point this out in case you were going to head my advice and try with the old code.

[piort]

thx Janni,
i'm sure the prob was the forgotten end termination of the created string
That happens when i switch between Delphi and MP too often in the same day
I will change the list accordantly
Thx again to pointing it