Delphi Basics : PInt64 command

DelphiBasics

PInt64
Type

Pointer to an Int64 value

System unit

type PInt64 = ^Int64;

Description

The PInt64 type is a pointer to an Int64 value.

Pointer arithmetic, such as Inc, Dec can be used on it, for example to navigate a block of Int64 values, as in the example.

Related commands

Dec		Decrement an ordinal variable
Inc		Increment an ordinal variable
Int64		A 64 bit sized integer - the largest in Delphi

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Example code : Store 3 Int64 values in memory and navigate through them

var
  int64Ptr : PInt64;
  a : TDateTime;

begin
  // Allocate storage for three Int64 variables
  GetMem(int64Ptr, 3 * SizeOf(Int64));

  // Fill out these Int64 variables
  int64Ptr^ := 1;
  Inc(int64Ptr);
  int64Ptr^ := 22;
  Inc(int64Ptr);
  int64Ptr^ := 333;

  // Now display these values
  Dec(int64Ptr, 2);
  ShowMessageFmt('Value 1 = %d',[int64Ptr^]);
  Inc(int64Ptr);
  ShowMessageFmt('Value 2 = %d',[int64Ptr^]);
  Inc(int64Ptr);
  ShowMessageFmt('Value 3 = %d',[int64Ptr^]);
end;

Show full unit code

  Value 1 = 1
  Value 2 = 22
  Value 3 = 333