如何取出‘_ctypes._SimpleCData' objects的值
时间: 2024-02-20 16:58:53 浏览: 30
`_ctypes._SimpleCData` 是 Python 中 ctypes 模块提供的一个 C 数据类型的基类,它包含了一些 C 数据类型的基本属性和方法。如果要取出 `_ctypes._SimpleCData` 对象的值,需要根据具体的数据类型来进行处理。
以 `ctypes.c_int` 类型为例,`c_int` 是 `_ctypes._SimpleCData` 的子类,它表示 C 语言中的整型数据类型。假设有一个 `c_int` 类型的对象 `my_int`,可以通过访问它的 `value` 属性来获取它的值。例如:
```
import ctypes
my_int = ctypes.c_int(123)
print(my_int.value) # 输出 123
```
如果需要处理其他的 `_ctypes._SimpleCData` 类型,可以查看对应的文档,找到相应的属性或方法来获取它们的值。
相关问题
linux编译Python310源码报错 _ctypes/_ctypes.c 没有ffi.h
这个错误是由于缺少 libffi 库导致的。为了解决这个问题,您需要安装 libffi 库。可以使用以下命令安装:
```
sudo apt-get install libffi-dev
```
或者
```
sudo yum install libffi-devel
```
安装完成后,重新编译 Python310 源码即可。
TypeError: cannot set '__setattr__' attribute of immutable type '_ctypes.Structure'
This error occurs when you try to set an attribute using the __setattr__ method on an immutable object of the "_ctypes.Structure" class.
_ctypes.Structure is a class from the ctypes module that is used to define C-compatible data structures in Python. These structures are immutable by default, meaning that their attributes cannot be modified after they are created.
To resolve this error, you need to create a new instance of the structure with the updated attribute values instead of trying to modify the existing instance.
Alternatively, you can make the structure mutable by subclassing it and defining the __setattr__ method to allow attribute modification. However, this may affect the C compatibility of the structure and is not recommended in most cases.