C++/QT 逐行获取文件内容操作

最新推荐文章于 2024-10-26 16:28:10 发布

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最新推荐文章于 2024-10-26 16:28:10 发布

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记录一下，每次都忘很烦

C++

数据类似这样的

在这里插入图片描述

头文件:
#pragma once
#include <fstream>
#include <iostream>
#include <vector>
#include <string>
using namespace std;
double Vertx[20], Verty[20];
ifstream MyFile("E:\\大二下\\上机代码\\算法课设上机\\SatCoverInfo_0.txt");
vector<string>str_lines;
void ReadFile();

cpp:
void ReadFile()
{
	if (!MyFile.is_open())
	{
		cout << "can't open this file" << endl;
		return;
	}
	int CurRow = 0; str_lines.resize(30);
	while (getline(MyFile, str_lines[CurRow++]))
	{
		if (CurRow == 22)
			break;
	}
	/*for (int i = 0; i < 22; ++i)
		cout << str_lines[i] << endl;*/
	MyFile.close();
	for (int i = 1; i < 21; ++i)
	{
		string str = str_lines[i];
		cout << str << endl;
		string strSplit_1 = str.substr(1, 8);
		string strSplit_2 = str.substr(19, 8);
		Vertx[i-1] = atof(strSplit_1.c_str());
		Verty[i-1] = atof(strSplit_2.c_str());
	}
	for (int i = 0; i < 20; ++i)
	{
		cout << Vertx[i] << " " << Verty[i] << endl;
	}
}

QT的

void Widget::readCsv1()
{
    fill(D[0],D[0]+50*50,INF);
    fill(Dcopy[0],Dcopy[0]+50*50,INF);
    QFile file("省会城市邻接矩阵1.csv");
    if(!file.open(QIODevice::ReadOnly|QIODevice::Text))
        qDebug()<<"File open failed";
    QTextStream in(&file);
    stu_lines.clear();
    while(!in.atEnd())
    {
        QString lines=in.readLine();
        stu_lines.append(lines);
    }
    file.close();
    for(int i=2;i<stu_lines.length();++i)
    {
        QString lines=stu_lines.at(i);
        QStringList linesplit=lines.split(",");
        for(int a=1;a<linesplit.length();++a)
        {
            if(G[i-1][a-1]||G[a-1][i-1])
            {
                D[i-1][a-1]=linesplit.at(a).toInt();
                D[a-1][i-1]=linesplit.at(a).toInt();
            }
            else
            {
                D[i-1][a-1]=INF;
                D[a-1][i-1]=INF;
            }
        }
    }
}