Question

当将文件附加到另一个奇怪的符号出现在结尾时它的ascii是-1，如果有另一种方法将文件添加到另一个请分享

void AddFile(char old_name[],char old_content[]) {
    ofstream old_file;
    ifstream new_file;
    char new_name[255];
    int len, f_begin, f_end;
    cout << "Enter the file name: ";
    cin.ignore();
    cin.getline(new_name,255,'\n');
    strcat(new_name, ".txt");
    new_file.open(new_name);
    f_begin = new_file.tellg();
    new_file.seekg(0,ios::end);
    f_end = new_file.tellg();
    new_file.seekg(0);
    len = f_end - f_begin;
    char new_content[len+1];
    new_content[len] = '\0';
    for (int i=0; i< len; ++i) {
        new_content[i] = new_file.get();
    }
    new_file.close();
    strcat(old_content,"\n");
    strcat(old_content,new_content);
    old_file.open(old_name);
    cout << old_content;
    old_file << old_content;
    old_file.close();
}

.tellg（）函数给出正确的大小

Answer 1

我只写了一段代码来帮助您朝着正确的方向前进。您可以使用它或根据需要进行修改。

#include <iostream>
#include <fstream>
using namespace std;


void AddFile(char old_name[], char old_content[]) {
    ofstream old_file;
    ifstream new_file;
    char new_name[255];
    int len, f_begin, f_end;
    cout << "Enter the file name: ";
    /*cin.ignore();
    cin.getline(new_name, 255, '\n');*/
    cin >> new_name;
    strcat(new_name, ".txt");
    new_file.open(new_name);
    old_file.open(old_name, ios::ios_base::app);
    char line[65535];
    while (new_file.getline(line, 65535))
    {
        old_file << endl << line;
    }
    new_file.close();
    old_file.close();

    //verify new data
    new_file.open(old_name);
    while (new_file.getline(line, 65535))
    {
        cout << line << endl;
    }

}

void main()
{
    AddFile("hello.txt", "old data");
}

如果你可以分享你的用例，我可以提供更好的帮助。

当我尝试将文件添加到另一个文件时出现奇怪的符号？

1 个答案: