python 調用C++ DLL,傳遞int,char,char*，數組和多維數組

ctypes 數據類型和 C數據類型 對照表

ctypes type	C type	Python type
c_bool	_Bool	bool (1)
c_char	char	1-character string
c_wchar	wchar_t	1-character unicode string
c_byte	char	int/long
c_ubyte	unsigned char	int/long
c_short	short	int/long
c_ushort	unsigned short	int/long
c_int	int	int/long
c_uint	unsigned int	int/long
c_long	long	int/long
c_ulong	unsigned long	int/long
c_longlong	__int64 or long long	int/long
c_ulonglong	unsigned __int64 or unsigned long long	int/long
c_float	float	float
c_double	double	float
c_longdouble	long double	float
c_char_p	char * (NUL terminated)	string or None
c_wchar_p	wchar_t * (NUL terminated)	unicode or None
c_void_p	void *	int/long or None

//C++文件

#include<iostream>

using namespace std;

//該文件名稱：cpptest.cpp

//終端下編譯指令：

//g++ -o cpptest.so -shared -fPIC cpptest.cpp

//-o 指定生成的文件名，-shared 指定微共享庫，-fPIC 表明使用地址無關代碼

extern "C"{//在extern “C”中的函數才能被外部調用

    int test(int int_test,char char_test,char *test_string,int int_arr[4],char char_arr2[2][2]) {

        cout<<"輸出參數中的int型:";
        cout<<int_test<<endl;

        cout<<"輸出參數中的char型：";
        cout<<char_test<<endl;

        cout << "輸出參數中的字char*字符:";
        cout<<test_string<<endl;

        cout << "輸出參數中的int數組";
        for(int x = 0;x< 4;x++){cout << int_arr[x]<<"    ";}
        cout << endl;

        cout <<"輸出參數中的二維數組：";
        for(int x = 0;x<2;x++){
            for(int y = 0;y<2;y++){
            cout <<char_arr2[x][y] << "    ";
            }
        }

        cout << endl;
        return 0;
    }
}

 

//py文件

import ctypes

mylib = ctypes.cdll.LoadLibrary("cpptest.so")

char_p_test = bytes("中國","utf8")#漢字需用采用utf8編碼

int_arr4 = ctypes.c_int*4

int_arr = int_arr4()

int_arr[0] = 1

int_arr[1] = 3

int_arr[2] = 5

int_arr[3] = 9

char_arr2 = ctypes.c_char*2

char_arr22 = char_arr2*2

char_arr22a = char_arr22()

char_arr22a[0][0] = b'a'

char_arr22a[0][1]=  b'b'

char_arr22a[1][0] = b'c'

char_arr22a[1][1] = b'd'

mylib.test(9999,'a',char_p_test,int_arr,char_arr22a)

 

 

參考：python 調用C++,傳遞int,char,char*，數組和多維數組

 

結構體傳參

https://www.jb51.net/article/52513.htm

『Python CoolBook』使用ctypes訪問C代碼_下_demo進階

 

 

https://www.programcreek.com/python/example/1243/ctypes.c_char_p