Matlab 与 c++对txt 文档的读写格式

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。