C++ DLL的制作与使用

制作DLL // calc.h #ifdef EXPORT_DLL #define CALC_API __declspec(dllexport) #else #define CALC_API __declspec(dllimport) #endif extern "C" { CALC_API int 加(int a, int b); CALC_API int 减(int a, int b); CALC_API int 乘(int a, int b); CALC_API double 除(double a, double b); } // calc.cpp #define EXPORT_DLL #include "calc.h" extern "C" { CALC_API int 加(int a, int b) { return a + b; } CALC_API int 减(int a, int b) { return a - b; } CALC_API int 乘(int a, int b) { return a * b; } CALC_API double 除(double a, double b) { return a / b; } } // CMakeLists.txt cmake_minimum_required(VERSION 3.10) project(calc) set(CMAKE_CXX_STANDARD 11) if(MSVC) add_compile_options("/source-charset:utf-8") endif() include_directories(./include) if(MSVC) add_compile_options("/source-charset:utf-8") endif() file(GLOB SOURCES "./src/*.cpp") add_library(${PROJECT_NAME} SHARED ${SOURCES}) 使用DLL // useCalc.cpp #include <iostream> #include "calc.h" using namespace std; int main() { cout << 加(3, 4) << endl; } // CMakeLists.txt cmake_minimum_required(VERSION 3.10) project(useCalc) set(CMAKE_CXX_STANDARD 11) if(MSVC) add_compile_options("/source-charset:utf-8") endif() file(GLOB SOURCES "src/*.cpp") include_directories(include) add_executable(${PROJECT_NAME} ${SOURCES}) target_link_libraries(${PROJECT_NAME} calc)