How to convert array of Byte to PByte in Delphi?

Question

I'm using Delphi 5. I define an array of byte, as follows:

Buffer: Array of BYTE;

How to convert it to a PByte pointer?

Answer 1

A dynamic array is implemented as a pointer, so you can simply type-cast it as-is:

var
  Buffer: array of Byte;
  P: PByte;
begin
  SetLength(Buffer, ...);
  P := PByte(Buffer);
  ...
end;

If you don't want to rely on this implementation detail, you can instead take the memory address of the 1st byte in the array:

P := @Buffer[0];