How to append content to the end of a file using C++?

In C++, to append content to the end of a file, you can use the open() and seekg() functions in the fstream library: Use the open() function to open the file in append mode. Use the seekg() function to move the file pointer to the end of the file. Use the insertion operator (

How to use C++ to append content at the end of a file

In C++, you can use the file operation functionfstream The open() and seekg() etc. to append content to the end of the file.

Code example:

#include <fstream>
#include <iostream>

using namespace std;

int main() {
    // 打开文件
    fstream file;
    file.open("my_file.txt", ios::app);

    // 移动文件指针到文件末尾
    file.seekg(0, ios::end);

    // 追加内容
    file << "追加的内容\n";

    // 关闭文件
    file.close();

    return 0;
}

Practical case:

This code can be used to append log information to the log file . For example:

#include <fstream>
#include <ctime>

using namespace std;

int main() {
    // 打开日志文件
    fstream file;
    file.open("log.txt", ios::app);

    // 获取当前时间
    time_t now = time(0);
    tm *ltm = localtime(&now);

    // 将当前时间的日志信息追加到文件中
    file << "[" << ltm->tm_year + 1900 << "-" << ltm->tm_mon + 1 << "-" << ltm->tm_mday << " "
         << ltm->tm_hour << ":" << ltm->tm_min << ":" << ltm->tm_sec << "] 日志信息\n";

    // 关闭日志文件
    file.close();

    return 0;
}

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