if (file) {
    // Read a chunk of data into buffer
    file.get(buffer, sizeof(buffer),'1');

    // Output the number of characters actually read
    std::streamsize numChars = file.gcount();
    std::cout << "Number of characters read: " << numChars << std::endl;

    // Null-terminate the string and output it
    buffer[numChars] = '\0';
    std::cout << "Content read: " << buffer << std::endl;
}

return 0;

// 创建一个 stringbuf 对象来存储读取的内容
std::stringbuf sb;

// 从 input 流中读取字符，直到遇到字符 '!'
input.get(sb, '!');

// 获取读取的字符串
std::string result = sb.str();

// 输出结果
std::cout << "Read content: " << result << std::endl;

//this cannot change the string 
std::cout<<"\n"<<input.str();

return 0;