c++怎么用C++封装一个C库_c++封装C库的接口与实现方法

// clib.h (C语言头文件)
#ifndef CLIB_H
#define CLIB_H
<p>int add(int a, int b);
void print_message(const char* msg);</p><h1>endif</h1><p>

// wrapper.h
#ifndef WRAPPER_H
#define WRAPPER_H
<h1>ifdef __cplusplus</h1><p>extern "C" {</p><h1>endif</h1><h1>include "clib.h"  // 包含原始C头文件</h1><h1>ifdef __cplusplus</h1><p>}</p><h1>endif</h1><p>class CppWrapper {
public:
static int add(int a, int b);
static void showMessage(const std::string& msg);
};</p><h1>endif</h1><p>

// wrapper.cpp
#include "wrapper.h"
#include <string>
#include <iostream>
<p>int CppWrapper::add(int a, int b) {
return ::add(a, b);  // 调用C函数
}</p><p>void CppWrapper::showMessage(const std::string& msg) {
::print_message(msg.c_str());
}

// cfile_lib.h (C库)
typedef struct FileHandle FileHandle;
FileHandle* open_file(const char* path);
void close_file(FileHandle* fh);
int read_data(FileHandle* fh, void* buf, int size);

// file_wrapper.h
class FileWrapper {
    FileHandle* handle;
public:
    explicit FileWrapper(const std::string& path);
    ~FileWrapper();
<pre class="brush:php;toolbar:false;"><pre class="brush:php;toolbar:false;">int read(void* buffer, int size);

// file_wrapper.cpp
#include "file_wrapper.h"
extern "C" {
#include "cfile_lib.h"
}
<p>FileWrapper::FileWrapper(const std::string& path) {
handle = open_file(path.c_str());
if (!handle) {
throw std::runtime_error("Cannot open file");
}
}</p><p>FileWrapper::~FileWrapper() {
if (handle) {
close_file(handle);
}
}</p><p>int FileWrapper::read(void* buffer, int size) {
return read_data(handle, buffer, size);
}

gcc -c clib.c -o clib.o          # 编译C库
g++ -c wrapper.cpp -o wrapper.o  # 编译C++封装
g++ main.cpp wrapper.o clib.o -o program  # 链接