Python获得文件版本信息

Python干啥都挺方便的，出了调用win32的api。当然了，可以用pywin32这种库。但我不喜欢为了一两个api又给简单的东西加一堆依赖。比如获取文件版本，本来想在网上找个函数复制过去用得了，却发现还真没啥好用的。无奈自己就写了一个。

class VS_FIXEDFILEINFO(Structure):
    _fields_ = [
        ("dwSignature", c_int), 
        ("dwStrucVersion", c_int),
        ("dwFileVersionMS", c_int),
        ("dwFileVersionLS", c_int),
        ("dwProductVersionMS", c_int),
        ("dwProductVersionLS", c_int),
        ("dwFileFlagsMask", c_int),
        ("dwFileFlags", c_int),
        ("dwFileOS", c_int),
        ("dwFileType", c_int),
        ("dwFileSubtype", c_int),
        ("dwFileDateMS", c_int),
        ("dwFileDateLS", c_int)
    ]
def LOWORD(dword): return dword & 0x0000ffff
def HIWORD(dword): return dword >> 16
def GetFileVersion(filename):
    size = windll.version.GetFileVersionInfoSizeW(filename, None)
    if not size:
        return ''
    res = create_string_buffer(size)
    windll.version.GetFileVersionInfoW(filename, None, size, res)
    r = VS_FIXEDFILEINFO()
    l = c_uint()
    p = c_void_p()
    windll.version.VerQueryValueW(res, '\\', byref(p), byref(l));
    memmove(byref(r), p, sizeof(VS_FIXEDFILEINFO))
    if not l.value:
        return ''
    
    return ('%d.%d.%d.%d' % (HIWORD(r.dwFileVersionMS), LOWORD(r.dwFileVersionMS), 
        HIWORD(r.dwProductVersionLS), LOWORD(r.dwProductVersionLS)));