C++二进制文件读写

• 首页
• 关于
• 我的做什么

C++ 读写二进制文件

作者 传说一梦 写于 2008-05-08 | 6,708 次浏览 | 分类 » 软件开发 |

#include <fstream>
using namespace std;

…

// AuthInfo 是自定义的 struct
struct AuthInfo auth_info;
string susername, spassword;

/* 写文件 */ 
// 清零
ZeroMemory ( &auth_info, sizeof ( auth_info ) );

susername = "[email protected]";
spassword = "000000";

// 内存拷贝
memcpy(auth_info.username, susername.c_str(), susername.length());
memcpy(auth_info.password, spassword.c_str(), spassword.length());

// 定义打开输出流
ofstream fout("mbc.dat", ios::binary);

// 写入
fout.write((char *)(&auth_info), sizeof(auth_info));

// 关闭输出流
fout.close();

/* 读文件 */
ZeroMemory ( &auth_info, sizeof ( auth_info ) );

ifstream fin ( "mbc.dat", ios::binary );

fin.read((char *)(&auth_info), sizeof(auth_info));

susername = auth_info.username;
spassword = auth_info.password;

ZeroMemory ( auth_info.username, 100 );   // AuthInfo.username[100]
ZeroMemory ( auth_info.password, 50 );     // AuthInfo.password[50]

memcpy(auth_info.username, susername.c_str(), susername.length());
memcpy(auth_info.password, spassword.c_str(), spassword.length());  

fin.close();