1. 学习g++能够读取什么格式的txt文件。

   读基本指令:

   >sprintf(filename, "doc_%d.txt", d);

   >fileptr = fopen(filename, "r");

   >while ((fscanf(fileptr, "%d ") != EOF))

   > {fscanf(fileptr, "[%d,%d]", &s1, &s2);}

   fclose(fileptr);

   写基本指令：

   >fileptr = fopen("result_1.txt", "w");

   >fprintf(fileptr, "(%d)", x);

   >fprintf(fileptr, "\n");

   >fclose(fileptr);

具体的代码及要完成的简单任务描述如下：

// TestForReadTXT_Windows.cpp : 定义控制台应用程序的入口点。

//,读取doc_1.txt中的n行数据，并写入vector中,这里不进行运算，直接将xy坐标写回名为result_1.txt的文件中。

//数据在txt中的存放格式是3条轨迹以固定格式存储的轨迹数据

//5 [3,0](448,26,11)(447,26,13)(447,27,16)(447,28,17)(448,28,20)

//9 [0, 2](282, 101, 1436)(282, 102, 1437)(283, 102, 1440)(283, 101, 1442)(284, 101, 1445)(285, 101, 1447)(284, 101, 1448)(283, 101, 1451)(282, 101, 1455)

//3 [0,0](407,37,678)(406,37,682)(405,37,684)

//其中第一个代表元素个数，[]代表起止点，（x,y,t）代表轨迹信息

#include "stdafx.h"

#include <iostream>

#include <vector>

using namespace std;

typedef struct{

    int x;

    int y;

    size_t t;

} Point;

class Trajectory{

public:

    //Trajectory();

    size_t length;

    char source;

    char sink;

    vector<Point> d_point;

};

int _tmain(int argc, _TCHAR* argv[])

{

    size_t d, i;

    int length, x, y, t, s1, s2, numTrk = 0;

    Point p;

    Trajectory* traj;

    vector<Trajectory> TD;

    char filename[100];

    FILE *fileptr;

    printf("load data ...\n");

    for (d = 1; d < 2; d++){

        //sprintf(filename, "trks_grand_ss8.txt");

        sprintf(filename, "doc_%d.txt", d);

        //sprintf(filename, "parkinglot_trk.txt");

        fileptr = fopen(filename, "r");

        while ((fscanf(fileptr, "%d ", &length) != EOF))//原始数据中的每行第一个数代表轨迹的长度

        {

            traj = new Trajectory();

            fscanf(fileptr, "[%d,%d]", &s1, &s2);//原始数据中的每行第2个代表source,sink点是否被观察

            /* traj->d_source=s1;

            traj->d_sink=s2;*/

            for (i = 0; i < length; i++){

                fscanf(fileptr, "(%d,%d,%d)", &x, &y, &t);

                p.x = x; p.y = y; p.t = t;

                traj->d_point.push_back(p);// (i, p, s1, s2);

            }

            fscanf(fileptr, "\n");

            traj->sink = s1;

            traj->source = s2;

            traj->length = length;

            TD.push_back(*traj);

            //d_trajSet.push_back(*traj);

            //d_trajSet[numTrk].trkSource = s1;

            //d_trajSet[numTrk].trkSink = s2;

            //printf("cur TrkSource is %d, curTrkSink is %d. \n", d_trajSet[numTrk].trkSource,d_trajSet[numTrk].trkSink);

            //system( "pause ");

            numTrk++;

            delete traj;

        }

        fclose(fileptr);

    }

    printf("%d trajectories are loaded. \n", numTrk);

    fileptr = fopen("result_1.txt", "w");

    for (int k = 0; k < numTrk; k++){

        for (int w = 0; w < TD.at(k).length; w++){

            fprintf(fileptr, "(%d)", TD.at(k).d_point.at(w).x);

        }

        fprintf(fileptr, "\n");

        for (int w = 0; w < TD.at(k).length; w++){

            fprintf(fileptr, "(%d)", TD.at(k).d_point.at(w).y);

        }

        fprintf(fileptr, "\n");

    }

    fclose(fileptr);

    return 0;

}

写入result_1之后的结果如下：

(448)(447)(447)(447)(448)

(26)(26)(27)(28)(28)

(282)(282)(283)(283)(284)(285)(284)(283)(282)

(101)(102)(102)(101)(101)(101)(101)(101)(101)

(407)(406)(405)

(37)(37)(37)

程序在Ubuntu中的配置：需要多加一个在vc中包含于iostream中的头文件 #include<stdio.h>

在VC中用sprintf(filename, "..//..//..//data/doc_%d.txt", d);来表征上层目录。

Matlab 与 c++对txt 文档的读写格式