如何将2d数组从Python传递到C？

清单[SciPy.Docs]：C-Types外部函数接口（numpy.ctypeslib）（和[Python 3.Docs]：ctypes-Python的外部函数库，以防万一。

这就像[SO]一样：通过ctypes在Python中调用C函数，但是函数返回的值不正确（@CristiFati的回答）（重复），它碰巧也涉及NumPy。
换句话说，您具有Undefined Behavior，因为argtypes必须是CTypes类型（不是 NumPy）。

下面是您的代码的修改后的版本，可以正常工作。

dll00.c：

#include <stdint.h>#if defined(_WIN32)#  define DLL00_EXPORT_API __declspec(dllexport)#else#  define DLL00_EXPORT_API#endif#if defined(__cplusplus)extern "C" {#endifDLL00_EXPORT_API uint16_t dll00Func00(uint16_t **ppArr);#if defined(__cplusplus)}#endifuint16_t dll00Func00(uint16_t **ppArr) {    return ppArr[5][5];}

pre00.py：

#!/usr/bin/env python3import sysimport ctypes as ctimport numpy as npDLL_NAME = "./dll00.dll"def main():    UI16Ptr = ct.POINTER(ct.c_uint16)    UI16PtrPtr = ct.POINTER(UI16Ptr)    dll00 = ct.CDLL(DLL_NAME)    dll00Func00 = dll00.dll00Func00    dll00Func00.argtypes = [UI16PtrPtr]    dll00Func00.restype = ct.c_uint16    dim0 = 10    dim1 = 10    np_arr_2d = np.empty([dim0, dim1], dtype=np.uint16)    np_arr_2d[5][5] = 5    print(np_arr_2d)    # The "magic" happens in the following (3) lines of pre    ct_arr = np.ctypeslib.as_ctypes(np_arr_2d)    UI16PtrArr = UI16Ptr * ct_arr._length_    ct_ptr = ct.cast(UI16PtrArr(*(ct.cast(row, UI16Ptr) for row in ct_arr)), UI16PtrPtr)    res = dll00Func00(ct_ptr)    print("n{0:s} returned: {1:d}".format(dll00Func00.__name__, res))if __name__ == "__main__":    print("Python {0:s} {1:d}bit on {2:s}n".format(" ".join(item.strip() for item in sys.version.split("n")), 64 if sys.maxsize > 0x100000000 else 32, sys.platform))    print("NumPy: {0:s}n".format(np.version.version))    main()    print("nDone.")

输出：

[cfati@CFATI-5510-0:e:WorkDevStackOverflowq058727931]> sopr.bat*** Set shorter prompt to better fit when pasted in StackOverflow (or other) pages ***[prompt]> "c:Installx86MicrosoftVisual Studio Community2017VCAuxiliaryBuildvcvarsall.bat" x64************************************************************************ Visual Studio 2017 Developer Command prompt v15.9.17** Copyright (c) 2017 Microsoft Corporation**********************************************************************[vcvarsall.bat] Environment initialized for: 'x64'[prompt]> dir /bpre00.pydll00.c[prompt]> cl /nologo /DDLL dll00.c  /link /NOLOGO /DLL /OUT:dll00.dlldll00.c   Creating library dll00.lib and object dll00.exp[prompt]> dir /bpre00.pydll00.cdll00.dlldll00.expdll00.libdll00.obj[prompt]> "e:WorkDevVEnvspy_064_03.07.03_test0scriptspython.exe" pre00.pyPython 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)] 64bit on win32NumPy: 1.16.2[[19760  5277   632     0 32464  5280   632     0   111   114] [  107    92    68   101   118    92    86    69   110   118] [  115    92   112   121    95    48    54    52    95    48] [   51    46    48    55    46    48    51    95   116   101] [  115   116    48    92   108   105    98    92   115   105] [  116   101    45   112    97     5   107    97   103   101] [  115    92   110   117   109   112   121    92   116   101] [  115   116   105   110   103    92    95   112   114   105] [  118    97   116   101    92   110   111   115   101   116] [  101   115   116   101   114    46   112   121     0     0]]dll00Func00 returned: 5Done.

可以在[SO]中找到所有这些时髦转换的说明：C 和Python：将2D双指针数组从python传递并返回到c （@ CristiFati的回答）（以及参考的[SO]：传递和获取数组的问题使用ctypes的C函数（@CristiFati的答案））。