ctypes中的结构内联合语法 [英] Union-within-structure syntax in ctypes

问题描述

关于ctypes语法的快速问题，因为对于像我这样的初学者来说并没有统一文件的文档。

Quick question about ctypes syntax, as documentation for Unions isn't clear for a beginner like me.

说我想实现INPUT结构（请参见此处）：

Say I want to implement an INPUT structure (see here):

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

我还是需要更改以下代码？

Should I or do I need to change the following code?

class INPUTTYPE(Union):
    _fields_ = [("mi", MOUSEINPUT),
                ("ki", KEYBDINPUT),
                ("hi", HARDWAREINPUT)]

class INPUT(Structure):
    _fields_ = [("type", DWORD),
                (INPUTTYPE)]

不确定我是否可以为工会使用一个未命名的字段，但是要添加Win32API中未定义的名称似乎很危险。

Not sure I can have an unnamed field for the union, but adding a name that isn't defined in the Win32API seems dangerous.

谢谢

迈克

推荐答案

您的结构语法无效：

AttributeError: '_fields_' must be a sequence of pairs

我相信您想使用匿名属性。看起来ctypes文档创建了一个 TYPEDESC 结构（非常相似

I believe you want to use the anonymous attribute in your ctypes.Structure. It looks like the ctypes documentation creates a TYPEDESC structure (which is very similar in construction to the tagINPUT).

还请注意，您必须将DWORD定义为平台的基本类型。

Also note that you'll have to define DWORD as a base type for your platform.

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