pdfGetMaxFieldLen

int32_t __stdcall pdfGetMaxFieldLen(PPDF IPDF, uint32_t TxtField);
BOOL32 __stdcall pdfSetMaxFieldLen(PPDF IPDF, uint32_t TxtField, int32_t MaxLen);

function pdfGetMaxFieldLen(const IPDF: PPDF; TxtField: Cardinal): Integer; stdcall;
function pdfSetMaxFieldLen(const IPDF: PPDF; TxtField: Cardinal; MaxLen: Integer): LongBool; stdcall;

Purpose. Get/set a text field's /MaxLen character limit.

Return value. Getter: the current limit (0 = unlimited, or if TxtField doesn't resolve — the two are indistinguishable). Setter: True on success.

C# (P/Invoke)

public static extern int pdfGetMaxFieldLen(IntPtr IPDF, uint TxtField);