Delphi XE2 VCL样式,更改窗口Icon在标题栏上不会更新,直到Recrea

procedure PatchCode(Address: Pointer; const NewCode; Size: Integer);
var
  OldProtect: DWORD;
begin
  if VirtualProtect(Address,Size,PAGE_EXECUTE_READWRITE,OldProtect) then
  begin
    Move(NewCode,Address^,Size);
    FlushInstructionCache(GetCurrentProcess,Address,Size);
    VirtualProtect(Address,OldProtect,@OldProtect);
  end;
end;

type
  PInstruction = ^TInstruction;
  TInstruction = packed record
    Opcode: Byte;
    Offset: Integer;
  end;

procedure RedirectProcedure(OldAddress,NewAddress: Pointer);
var
  NewCode: TInstruction;
begin
  NewCode.Opcode := $E9;//jump relative
  NewCode.Offset := NativeInt(NewAddress)-NativeInt(OldAddress)-SizeOf(NewCode);
  PatchCode(OldAddress,NewCode,SizeOf(NewCode));
end;

type
  TFormStyleHookHelper = class helper for TFormStyleHook
    function GetIconFastAddress: Pointer;
    function GetIconAddress: Pointer;
  end;

function TFormStyleHookHelper.GetIconFastAddress: Pointer;
var
  MethodPtr: function: TIcon of object;
begin
  MethodPtr := Self.GetIconFast;
  Result := TMethod(MethodPtr).Code;
end;

function TFormStyleHookHelper.GetIconAddress: Pointer;
var
  MethodPtr: function: TIcon of object;
begin
  MethodPtr := Self.GetIcon;
  Result := TMethod(MethodPtr).Code;
end;

initialization
  RedirectProcedure(
    Vcl.Forms.TFormStyleHook(nil).GetIconFastAddress,Vcl.Forms.TFormStyleHook(nil).GetIconAddress
  );