Delphi反转顺序字节 [英] Delphi Reverse order of bytes

问题描述

我一直在尝试编写一个使用两个指针（一个输入和一个输出）的函数，并将输入的字节以相反的顺序写入输出。到目前为止，我无法使其正常工作。

I have been trying to write a function that takes two pointers (an input and an output) and writes the bytes from the input into the output in reverse order. So far I have not been able to make it work correctly.

procedure ReverseBytes(Source, Dest: Pointer; Size: Integer);
var
  Index: Integer;
begin
  Move(Pointer(LongInt(Source) + Index)^, Pointer(LongInt(Dest) + (Size - Index))^ , 1);   
end;

任何人都可以建议一个更好的方式来做到这一点。

Can anyone please suggest a better way of doing this.

谢谢。

推荐答案

procedure ReverseBytes(Source, Dest: Pointer; Size: Integer);
var
  Index: Integer;
begin
  for Index := 0 to Size - 1 do
    Move(Pointer(LongInt(Source) + Index)^, 
        Pointer(LongInt(Dest) + (Size - Index - 1))^ , 1);
end;

procedure TForm2.Button2Click(Sender: TObject);
var
  s: AnsiString;
  P: Pointer;
begin
  s := #0'testreverse';
  GetMem(P, Length(s));
  ReverseBytes(Pointer(s), P, Length(s));

  ShowMessage(PAnsiChar(P));   // esrevertset
  FreeMem(P);
end;

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