From: Heesob Park <phasis@...>
Date: 2009-12-30T21:34:10+09:00
Subject: Re: au3 0.1.1 released

2009/12/30 Marvin Gülker <sutniuq@gmx.net>:
> Heesob Park wrote:
>> Regards,
>>
>> Park Heesob
>
> Works great! But I have a question about the 0.chr line: Why do you need
> to append 8 extra bytes to achieve a size of 28 bytes? I guess, it has
> something to do with C's array treatment?
>
As you know, the INPUT structure defined like this:

typedef struct tagINPUT {
  DWORD type;
  union {MOUSEINPUT mi;
            KEYBDINPUT ki;
            HARDWAREINPUT hi;
           };
  }INPUT, *PINPUT;

typedef struct tagMOUSEINPUT {
    LONG dx;
    LONG dy;
    DWORD mouseData;
    DWORD dwFlags;
    DWORD time;
    ULONG_PTR dwExtraInfo;
} MOUSEINPUT, *PMOUSEINPUT;

typedef struct tagKEYBDINPUT {
    WORD wVk;
    WORD wScan;
    DWORD dwFlags;
    DWORD time;
    ULONG_PTR dwExtraInfo;
} KEYBDINPUT, *PKEYBDINPUT;

typedef struct tagHARDWAREINPUT {
    DWORD uMsg;
    WORD wParamL;
    WORD wParamH;
} HARDWAREINPUT, *PHARDWAREINPUT;

The sizeof(MOUSEINPUT) is 24, sizeof(KEYBDINPUT) is 16, and
sizeof(HARDWAREINPUT) is 8.
Therefore, sizeof(INPUT) = sizeof(DWORD) + maxsizeof(union) = 4 + 24 = 28.

Regards,

Park Heesob