在 Windows 中，当我导入 ctypes 模块时，ctypes.cdll.msvcrt 对象会自动存在，它代表 msvcrt Microsoft C++ 运行时库 根据文档。
但是，我注意到还有一个 find_msvcrt 函数，它将“返回Python使用的VC运行类型库的文件名”。
它进一步指出，“如果您需要释放内存，例如，由扩展模块通过调用 free(void *) 分配的内存，那么在分配内存的同一库中使用该函数非常重要。”
所以我的问题是，我已有的 ctypes.cdll.msvcrt 库与我可以使用 find_msvcrt 加载的库之间有什么区别？功能？在什么特定情况下它们可能不是同一个库？
In Windows, the ctypes.cdll.msvcrt object automatically exists when I import the ctypes module, and it represents the msvcrt Microsoft C++ runtime library according to the docs.
However, I notice that there is also a find_msvcrt function which will "return the filename of the VC runtype library used by Python".
It further states, "If you need to free memory, for example, allocated by an extension module with a call to the free(void *), it is important that you use the function in the same library that allocated the memory."
So my question is, what's the difference between the ctypes.cdll.msvcrt library that I already have and the one which I can load with the find_msvcrt function? Under what specific circumstances might they not be the same library?
发布评论
评论（1）
不仅
ctypes.cdll.msvcrt自动存在，而且ctypes.cdll.anything自动存在，并且在第一次访问时加载，加载anything.dll< /代码>。因此，ctypes.cdll.msvcrt加载msvcrt.dll，它是作为 Windows 一部分提供的库。 Python 链接的不是 C 运行时，因此您不应从msvcrt调用 malloc/free。例如，对于 Python 2.6/3.1，您应该使用
ctypes.cdll.msvcr90。由于这会随着时间的推移而改变，find_msvcrt()< /code>为您提供应该真正使用的库的名称（然后通过ctypes.CDLL）。以下是 Microsoft CRT 的几个不同版本的名称，它们作为 MSC、VC++、平台 SDK 或 Windows 的一部分在不同时间点发布：crtdll.dll、msvcrt.dll、msvcrt4.dll、msvcr70.dll、msvcr71。 dll、msvcr80.dll、msvcr90.dll。
It's not just that
ctypes.cdll.msvcrtautomatically exists, butctypes.cdll.anythingautomatically exists, and is loaded on first access, loadinganything.dll. Soctypes.cdll.msvcrtloadsmsvcrt.dll, which is a library that ships as part of Windows. It is not the C runtime that Python links with, so you shouldn't call the malloc/free frommsvcrt.For example, for Python 2.6/3.1, you should be using
ctypes.cdll.msvcr90. As this will change over time,find_msvcrt()gives you the name of the library that you should really use (and then load throughctypes.CDLL).Here are the names of a few different versions of the Microsoft CRT, released at various points as part of MSC, VC++, the platform SDK, or Windows: crtdll.dll, msvcrt.dll, msvcrt4.dll, msvcr70.dll, msvcr71.dll, msvcr80.dll, msvcr90.dll.