如何从一个Delphi程序实例发送字符串到另一个实例？

uses Winapi.Windows, Winapi.Messages;

const
  WM_COPYDATA = $004A;

type
  PCopyDataStruct = ^TCopyDataStruct;
  TCopyDataStruct = record
    dwData: ULONG_PTR;
    cbData: DWORD;
    lpData: PVOID;
  end;

var
  hWndReceiver: HWND;
  s: string;
  cds: TCopyDataStruct;

begin
  hWndReceiver := FindWindow(nil, 'ReceiverWindowName');
  if hWndReceiver <> 0 then
  begin
    s := 'Hello, this is a string from sender instance.';
    cds.dwData := 0;
    cds.cbData := Length(s) * SizeOf(Char);
    cds.lpData := PChar(s);
    SendMessage(hWndReceiver, WM_COPYDATA, 0, LPARAM(@cds));
  end;
end;

uses Winapi.Windows, Winapi.Messages;

const
  WM_COPYDATA = $004A;

type
  PCopyDataStruct = ^TCopyDataStruct;
  TCopyDataStruct = record
    dwData: ULONG_PTR;
    cbData: DWORD;
    lpData: PVOID;
  end;

var
  s: string;

procedure TForm1.WMCopyData(var Msg: TWMCopyData);
begin
  if Msg.CopyDataStruct.dwData = 0 then
  begin
    SetLength(s, Msg.CopyDataStruct.cbData div SizeOf(Char));
    Move(Msg.CopyDataStruct.lpData^, PChar(s)^, Msg.CopyDataStruct.cbData);
    ShowMessage(s);
  end;
end;

uses Winapi.Windows, System.SysUtils;

const
  SharedMemoryName = 'MySharedMemory';

var
  hFileMap: THandle;
  pView: Pointer;
  s: string;

begin
  hFileMap := CreateFileMapping(INVALID_HANDLE_VALUE, nil, PAGE_READWRITE, 0, 1024, PChar(SharedMemoryName));
  if hFileMap <> 0 then
  begin
    pView := MapViewOfFile(hFileMap, FILE_MAP_WRITE, 0, 0, 0);
    if pView <> nil then
    begin
      s := 'Hello, this is a string from sender instance.';
      Move(PChar(s)^, pView^, Length(s) * SizeOf(Char));
      UnmapViewOfFile(pView);
    end;
    CloseHandle(hFileMap);
  end;
end;

uses Winapi.Windows, System.SysUtils;

const
  SharedMemoryName = 'MySharedMemory';

var
  hFileMap: THandle;
  pView: Pointer;
  s: string;

begin
  hFileMap := OpenFileMapping(FILE_MAP_READ, False, PChar(SharedMemoryName));
  if hFileMap <> 0 then
  begin
    pView := MapViewOfFile(hFileMap, FILE_MAP_READ, 0, 0, 0);
    if pView <> nil then
    begin
      SetLength(s, 1024 div SizeOf(Char));
      Move(pView^, PChar(s)^, 1024);
      UnmapViewOfFile(pView);
      ShowMessage(s);
    end;
    CloseHandle(hFileMap);
  end;
end;