Returns the length, in bytes, of the first MaxLen characters of a string.
function CharToByteLen(const S: string; MaxLen: Integer): Integer;
int CharToByteLen(const AnsiString S, int MaxLen);
SysUtils
Call CharToByteLen to convert the length of a string in characters to the corresponding length in bytes. CharToByteLen returns the number of bytes required by the first MaxLen characters of S. If S contains fewer than MaxLen characters, CharToByteLen returns the byte length of S.
If the system is not using a multi-byte character system (MBCS), CharToByteLen returns the length of S or MaxLen, whichever is smaller.
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