Two ways for C++ to call dynamic libraries and Python to call C++ dynamic libraries

Create dynamic library

Dynamic library is a library file loaded when the program is running and does not occupy the size of the program itself.

Select dynamic library project:

# cat.h
#pragma once
extern "C" _declspec(dllexport) int sum(int a, int b);

# cat.cpp
#include "pch.h"
#include "cat.h"
extern "C" _declspec(dllexport) int sum(int a, int b) {
return a + b;
}

#include 
#include "../../CATDLL/CATDLL/cat.h"
using namespace std;
#pragma comment(lib, "CATDLL.lib")
int main() {
cout << sum(1, 2) << endl;
return 0;
}

h Header file: Contains information such as data structures, classes, functions and other information declared and output in the dll.
lib library file: contains the name and location of the project exported by the DLL. In the application executable file that calls the dll, what is stored is not the function code being called, but the project to be called in the DLL. memory address.
dll dynamic library: contains the actual content. When publishing, only the .exe file and the .dll file are required, in the same directory.

#include 
#include 
using namespace std;
typedef int (*PSUM)(int, int);
int main() {
HMODULE hMoudle = LoadLibrary(TEXT("CATDLL.dll"));
PSUM psum = (PSUM)GetProcAddress(hMoudle, "sum");
cout << psum(4, 5) << endl;
FreeLibrary(hMoudle);
return 0;
}

Copy after login

import os
from ctypes import *
os.chdir("D:Cat课件CAT_CODINGC++项目开发MFC进阶和动态库注入辅助PYTEST")
dll = cdll.LoadLibrary("CATDLL.dll")
ret = dll.sum(1, 2)
print(ret)

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