C++ 查找文本文件中字符串是否存在

简介

查找文本文件中字符串是否存在

代码

#include <iostream>  
#include <fstream>  
#include <vector>  
#include <string>  

using namespace std;

bool SearchString(string filePath, string strF)
{
    vector<string> lines;
    string line;
    ifstream file(filePath); // 打开文件 example.txt  
    if (file.is_open()) // 判断文件是否打开成功  
    {
        while (getline(file, line)) // 逐行读取文件内容  
            lines.push_back(line); // 将每行数据存入 vector 中  
        file.close(); // 关闭文件  
    }

    if (find(lines.begin(), lines.end(), strF) == lines.end())
    {
        return false;
    }
    else
    {
        return true;
    }
}
int main() 
{
    string filePath = "F:\\lihai.txt";
    string searchString1 = "梅须逊雪三分白";
    string searchString2 = "何曾吹落北风中";

    bool result1 = SearchString(filePath, searchString1);
    bool result2 = SearchString(filePath, searchString2);

    cout << "Search result for \"" << searchString1 << "\":" << endl;
    cout << (result1 ? "Found" : "Not found") << endl;

    cout << "Search result for \"" << searchString2 << "\":" << endl;
    cout << (result2 ? "Found" : "Not found") << endl;


    cin.get();
    return 0;
}

输出：
Search result for “梅须逊雪三分白”:
Not found
Search result for “何曾吹落北风中”:
Found