[C++知识库]05 使用CMake在Windows下生成及使用动态库

1.生成动态库

在Windows下生成动态库，源码是和Linux有所区别，具体见之前文章；

直接看代码吧！
my_lib_export.h

#pragma once

#ifdef MY_LIB_SHARED_BUILD
#ifdef _WIN32
#ifdef MY_LIB_EXPORTS
#define MY_LIB_API __declspec(dllexport)
#else
#define MY_LIB_API __declspec(dllimport)
#endif  // MY_LIB_EXPORTS
#else
#define MY_LIB_API
#endif  // _WIN32
#else
#define MY_LIB_API
#endif  // MY_LIB_SHARED_BUILD

my_lib.h

#pragma once

#include <iostream>

#include "my_lib_export.h"

class MY_LIB_API MyClass {
public:
    static void MyPrint();
};

my_lib.cpp

#include "my_lib.h"

void MyClass::MyPrint() {
    std::cout << "Hello from MyClass." << std::endl;
}

CMakeLists

cmake_minimum_required(VERSION 3.5)

project(hello_library)

#这里是自定义编译变量，通过在编译时给的值不同，来区分生成静态库还是动态库
option(BUILD_SHARED_LIBS "Specifies the type of libraries (SHARED or STATIC) to build" ON)

if (BUILD_SHARED_LIBS)
    add_library(my_lib SHARED ${CMAKE_SOURCE_DIR}/my_lib/my_lib.cpp)
    target_compile_definitions(my_lib PUBLIC -DMY_LIB_SHARED_BUILD)
    target_compile_definitions(my_lib PRIVATE -DMY_LIB_EXPORTS)
else()
    add_library(my_lib STATIC ${SrcFiles})
endif()

target_include_directories(my_lib
    PUBLIC 
        ${PROJECT_SOURCE_DIR}/my_lib
)

我这边使用的是QtCreator打开的CMakeLists.txt文件,后直接编译，会生成.lib和.dll文件

2.动态库的使用

包含以下文件：my_lib_export.h my_lib.h mian.cpp
my_lib_export.h

#pragma once

#ifdef MY_LIB_SHARED_BUILD
#ifdef _WIN32
#ifdef MY_LIB_EXPORTS
#define MY_LIB_API __declspec(dllexport)
#else
#define MY_LIB_API __declspec(dllimport)
#endif  // MY_LIB_EXPORTS
#else
#define MY_LIB_API
#endif  // _WIN32
#else
#define MY_LIB_API
#endif  // MY_LIB_SHARED_BUILD

my_lib.h

#pragma once

#include <iostream>

#include "my_lib_export.h"

class MY_LIB_API MyClass {
public:
    static void MyPrint();
};

main.cpp

#include "my_lib.h"

int main(int argc, char *argv[])
{
    MyClass::MyPrint();
    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.5)

project(hello_library)

add_executable(cmake_examples_inst_bin
    main.cpp
)

target_include_directories(cmake_examples_inst_bin
    PUBLIC
        ${PROJECT_SOURCE_DIR}
)

target_link_libraries( cmake_examples_inst_bin
    PRIVATE 
        my_lib
)