python调用c++ ctype list传数组或者返回数组的方法

时间:2022-10-06 15:11:43

示例1:

pycallclass.cpp:

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#include <iostream>
using namespace std;
typedef unsigned char BYTE;
#define MAX_COUNT 20
 
struct tagOutCardResult_py
{
    BYTE                            cbCardCount;                   
    BYTE                            cbResultCard1;
    BYTE                            cbResultCard2;
    BYTE                            cbResultCard3;
    BYTE                            cbResultCard4;
    BYTE                            cbResultCard5;
    BYTE                            cbResultCard6;
    BYTE                            cbResultCard7;
    BYTE                            cbResultCard8;
    BYTE                            cbResultCard9;
    BYTE                            cbResultCard10;
    BYTE                            cbResultCard11;
    BYTE                            cbResultCard12;
    BYTE                            cbResultCard13;
    BYTE                            cbResultCard14;
    BYTE                            cbResultCard15;
    BYTE                            cbResultCard16;
    BYTE                            cbResultCard17;
    BYTE                            cbResultCard18;
    BYTE                            cbResultCard19;
    BYTE                            cbResultCard20;
};
 
struct tagOutCardResult
{
    BYTE                            cbCardCount;                   
    BYTE                            cbResultCard[MAX_COUNT];       
    void clear()
    {
        cbCardCount = 0;
        for (int nIdx = 0;nIdx < MAX_COUNT;++nIdx)
        {
            cbResultCard[nIdx] = 0;
        }
    }  
    void topy(tagOutCardResult_py* ppy)
    {
        cout<<"topy function begin"<<endl;
        ppy->cbCardCount = cbCardCount;
        cout<<"topy function 1"<<endl;
        ppy->cbResultCard1 = cbResultCard[1 - 1];
        cout<<"topy function 2"<<endl;
        ppy->cbResultCard2 = cbResultCard[2 - 1];
        ppy->cbResultCard3 = cbResultCard[3 - 1];
        ppy->cbResultCard4 = cbResultCard[4 - 1];
        ppy->cbResultCard5 = cbResultCard[5 - 1];
        ppy->cbResultCard6 = cbResultCard[6 - 1];
        ppy->cbResultCard7 = cbResultCard[7 - 1];
        ppy->cbResultCard8 = cbResultCard[8 - 1];
        ppy->cbResultCard9 = cbResultCard[9 - 1];
        ppy->cbResultCard10 = cbResultCard[10 - 1];
        ppy->cbResultCard11 = cbResultCard[11 - 1];
        ppy->cbResultCard12 = cbResultCard[12 - 1];
        ppy->cbResultCard13 = cbResultCard[13 - 1];
        ppy->cbResultCard14 = cbResultCard[14 - 1];
        ppy->cbResultCard15 = cbResultCard[15 - 1];
        ppy->cbResultCard16 = cbResultCard[16 - 1];
        ppy->cbResultCard17 = cbResultCard[17 - 1];
        ppy->cbResultCard18 = cbResultCard[18 - 1];
        ppy->cbResultCard19 = cbResultCard[19 - 1];
        ppy->cbResultCard20 = cbResultCard[20 - 1];
        cout<<"topy function end"<<endl;
    }
};
 
class TestLib
{
    public:
        void display(tagOutCardResult& ret);
};
void TestLib::display(tagOutCardResult& ret) {
    ret.cbCardCount = 3;
    ret.cbResultCard[0] = 1;
    ret.cbResultCard[1] = 50;
    ret.cbResultCard[2] = 100;
 
    cout<<"First display aaa ";
    cout<<"hello ";
    cout<<"world ";
}
 
extern "C" {
    TestLib oGameLogic;
    void display(tagOutCardResult_py* ret_py) {
        tagOutCardResult oRet;
        oGameLogic.display(oRet);
        cout<<"before topy"<<endl;
        oRet.topy(ret_py);
        cout<<"after topy"<<endl;
        cout<<"in cpp:ret_py->cbCardCount:"<<ret_py->cbCardCount<<endl;
        cout<<"in cpp:ret_py->cbResultCard1:"<<ret_py->cbResultCard1<<endl;
        cout<<" this:" << ret_py << endl;
    }
}

编译脚本:

g++ -o libpycallclass.so -shared -fPIC pycallclass.cpp -I/usr/include/python2.6 -L/usr/lib64/python2.6/config

Game.py调用部分。类声明:

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import ctypes
 
class tagOutCardResult_py(ctypes.Structure):
 _fields_ = [("cbCardCount", ctypes.c_ubyte), \
("cbResultCard1", ctypes.c_ubyte), \
("cbResultCard2", ctypes.c_ubyte), \
("cbResultCard3", ctypes.c_ubyte), \
("cbResultCard4", ctypes.c_ubyte), \
("cbResultCard5", ctypes.c_ubyte), \
("cbResultCard6", ctypes.c_ubyte), \
("cbResultCard7", ctypes.c_ubyte), \
("cbResultCard8", ctypes.c_ubyte), \
("cbResultCard9", ctypes.c_ubyte), \
("cbResultCard10", ctypes.c_ubyte), \
("cbResultCard11", ctypes.c_ubyte), \
("cbResultCard12", ctypes.c_ubyte), \
("cbResultCard13", ctypes.c_ubyte), \
("cbResultCard14", ctypes.c_ubyte), \
("cbResultCard15", ctypes.c_ubyte), \
("cbResultCard16", ctypes.c_ubyte), \
("cbResultCard17", ctypes.c_ubyte), \
("cbResultCard18", ctypes.c_ubyte), \
("cbResultCard19", ctypes.c_ubyte), \
("cbResultCard20", ctypes.c_ubyte)]

Game.py调用部分。具体调用:

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import ctypes
so = ctypes.cdll.LoadLibrary
lib = so("./libpycallclass.so")
ERROR_MSG('display(\)')
ret = tagOutCardResult_py(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
ERROR_MSG("before lib.display(ctypes.byref(ret))")
lib.display(ctypes.byref(ret))
ERROR_MSG("after lib.display(ctypes.byref(ret))")
ERROR_MSG('#######################################################################################')
ERROR_MSG(ret)
ERROR_MSG(ret.cbCardCount)
ERROR_MSG(ret.cbResultCard1)
ERROR_MSG(ret.cbResultCard2)
ERROR_MSG(ret.cbResultCard3)
ERROR_MSG(type(ret))

传入一个结构体,使用引用返回,回到python中打印出来结果是对的。

这样就可以传入,可以传出了。

示例1end#########################################################################

示例2:

pycallclass.cpp:

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#include <iostream>
using namespace std;
typedef unsigned char BYTE;
#define MAX_COUNT 20
 
#if defined(WIN32)||defined(WINDOWS)
#define DLL_EXPORT __declspec(dllexport)
#else
#define DLL_EXPORT
#endif
 
struct ByteArray_20
{
    BYTE e1;
    BYTE e2;
    BYTE e3;
    BYTE e4;
    BYTE e5;
    BYTE e6;
    BYTE e7;
    BYTE e8;
    BYTE e9;
    BYTE e10;
    BYTE e11;
    BYTE e12;
    BYTE e13;
    BYTE e14;
    BYTE e15;
    BYTE e16;
    BYTE e17;
    BYTE e18;
    BYTE e19;
    BYTE e20;
};
struct ByteArray_20_3
{
    ByteArray_20 e1;
    ByteArray_20 e2;
    ByteArray_20 e3;
};
 
struct ByteArrayNew_20_3
{
    BYTE e[3][20];
};
 
class TestLib
{
    public:
        void LogicFunc(ByteArray_20_3& ret);
        void LogicFuncNew(ByteArrayNew_20_3& ret);
};
void TestLib::LogicFunc(ByteArray_20_3& ret) {
    ret.e1.e1 = 3;
    ret.e1.e2 = 1;
    ret.e1.e3 = 50;
    ret.e2.e1 = 100;
    ret.e2.e2 = 200;
    ret.e2.e3 = 20;
 
    cout<<"TestLib::LogicFunc"<<endl;
}
void TestLib::LogicFuncNew(ByteArrayNew_20_3& ret) {
    ret.e[0][0] = 31;
    ret.e[0][1] = 11;
    ret.e[0][2] = 51;
    ret.e[1][0] = 101;
    ret.e[1][1] = 201;
    ret.e[1][2] = 21;
 
    cout << "TestLib::LogicFuncNew" << endl;
}
 
extern "C" {
    TestLib oGameLogic;
    void DLL_EXPORT display(ByteArray_20_3* pret) {
        cout<<"cpp display func begin"<<endl;
        oGameLogic.LogicFunc(*pret);
        cout<<"cpp display func end"<<endl;
    }
    void DLL_EXPORT display2(ByteArrayNew_20_3* pret) {
        cout << "cpp display2 func begin" << endl;
        oGameLogic.LogicFuncNew(*pret);
        cout << "cpp display2 func end" << endl;
    }
}

pycallclass.py:

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import ctypes
 
def ERROR_MSG(str):
 print str
 
class ByteArray_20(ctypes.Structure):
 _fields_ = [\
("e1", ctypes.c_ubyte), \
("e2", ctypes.c_ubyte), \
("e3", ctypes.c_ubyte), \
("e4", ctypes.c_ubyte), \
("e5", ctypes.c_ubyte), \
("e6", ctypes.c_ubyte), \
("e7", ctypes.c_ubyte), \
("e8", ctypes.c_ubyte), \
("e9", ctypes.c_ubyte), \
("e10", ctypes.c_ubyte), \
("e11", ctypes.c_ubyte), \
("e12", ctypes.c_ubyte), \
("e13", ctypes.c_ubyte), \
("e14", ctypes.c_ubyte), \
("e15", ctypes.c_ubyte), \
("e16", ctypes.c_ubyte), \
("e17", ctypes.c_ubyte), \
("e18", ctypes.c_ubyte), \
("e19", ctypes.c_ubyte), \
("e20", ctypes.c_ubyte)]
 
 
class ByteArray_20_3(ctypes.Structure):
 _fields_ = [\
("e1", ByteArray_20), \
("e2", ByteArray_20), \
("e3", ByteArray_20)]
 def __init__(self):
  self.aaa = 123
  self.bbb = [1, 2, 3, 4, 5]
  self.ccc = "alksdfjlasdfjk"
 def test(self):
  self.aaa = 123
  self.bbb = [1, 2, 3, 4, 5]
  self.ccc = "alksdfjlasdfjk"
  self.e1.e1 = 5
  self.e1.e2 = 20
 
 
so = ctypes.cdll.LoadLibrary
lib = so("./libpycallclass.dll")
print('display()')
ret = ByteArray_20_3()
ret.test()
ERROR_MSG(ret.e1.e1)
ERROR_MSG(ret.e1.e2)
print("before lib.display(ctypes.byref(ret))")
lib.display(ctypes.byref(ret))
print("after lib.display(ctypes.byref(ret))")
print('#######################################################################################')
print(ret)
ERROR_MSG(ret.e1)
ERROR_MSG(ret.e2)
ERROR_MSG(ret.e3)
ERROR_MSG(ret.e1.e1)
ERROR_MSG(ret.e1.e2)
ERROR_MSG(ret.e1.e3)
ERROR_MSG(ret.e2.e1)
ERROR_MSG(ret.e2.e2)
ERROR_MSG(ret.e2.e3)
ERROR_MSG(type(ret))
 
print("before lib.display2(ctypes.byref(ret))")
lib.display2(ctypes.byref(ret))
print("after lib.display2(ctypes.byref(ret))")
print('#######################################################################################')
print(ret)
ERROR_MSG(ret.e1)
ERROR_MSG(ret.e2)
ERROR_MSG(ret.e3)
ERROR_MSG(ret.e1.e1)
ERROR_MSG(ret.e1.e2)
ERROR_MSG(ret.e1.e3)
ERROR_MSG(ret.e2.e1)
ERROR_MSG(ret.e2.e2)
ERROR_MSG(ret.e2.e3)
ERROR_MSG(type(ret))
 
ret.test()
ERROR_MSG(ret.e1.e1)
ERROR_MSG(ret.e1.e2)

g++:

g++ -o libpycallclass.so -shared -fPIC pycallclass.cpp -I/usr/include/python2.6 -L/usr/lib64/python2.6/config

windows:

新建一个DLL工程,把pycallclass.cpp加进去,编译成DLL就OK了。

千万注意python的运行时是32位的还是64位的,DLL或者SO必须和它对应。

python类可以嵌套使用,继承ctypes.Structure,部分成员是_fields_里定义的,部分成员在__init__里定义,这样的类也可以ctypes.byref(self)传进c++去,传的是指针,传入传出就都OK了。

注意示例2中ByteArrayNew_20_3的用法,python中是定义了20个变量,c++中是直接一个二维数组。内存结构是一致的,所以可以直接这样使用。注意类型和长度必须一致,否则可能会内存访问越界。

以上这篇python调用c++ ctype list传数组或者返回数组的方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/uniqsa/article/details/78603082