[英]Using ifstream to read floats
I'm trying to read a series of floats from a .out file using ifstream, but if I output them afterwards, they are not correct. 我正在尝试使用ifstream从.out文件中读取一系列浮点数,但如果我之后输出它们,则它们不正确。
This is my input code: 这是我的输入代码:
float x, y, z;
ifstream table;
table.open("Resources/bones.out");
if (table.fail())
{
cout << "Can't open table" << endl;
return ;
}
table >> x;
table >> y;
table >> z;
cout << x << " " << y << " " << z << endl;
table.close();
My input file: 我的输入文件:
0.488454 0.510216 0.466979
0.487242 0.421347 0.472977
0.486773 0.371251 0.473103
...
Now for testing, i'm just reading the first line into x
y
and z
and my output is 现在进行测试,我只是将第一行读入x
y
和z
,我的输出是
1 0 2
Any ideas as to why I'm not getting the right output? 关于为什么我没有得到正确输出的任何想法?
#include <fstream>
#include <strtk.hpp> // http://www.partow.net/programming/strtk
std::string filename("Resources/bones.out");
// assuming the file is text
std::fstream fs;
fs.open(filename.c_str(), std::ios::in);
if(fs.fail()) return false;
const char *whitespace = " \t\r\n\f";
std::string line;
std::vector<float> floats;
std::vector<std::string> strings;
float x = 0.0, y = 0.0, z = 0.0;
std::string xs, ys, zs;
// process each line in turn
while( std::getline(fs, line ) )
{
// Removing beginning and ending whitespace
// can prevent parsing problems from different line endings.
// formerly accomplished with boost::algorithm::trim(line)
strtk::remove_leading_trailing(whitespace, line);
// strtk::parse combines multiple delimiters in these cases
if( strtk::parse(line, whitespace, floats ) )
{
std::cout << "succeed" << std::endl;
// floats contains all the values on the in as floats
}
if( strtk::parse(line, whitespace, strings) )
{
std::cout << "succeed" << std::endl;
// strings contains all the values on the in line as strings
}
if( strtk::parse(line, whitespace, x, y, z) )
{
std::cout << "succeed" << std::endl;
// x,y,z contain the float values. parse fails if more than 3 floats are on the line
}
if( strtk::parse(line, whitespace, xs, ys, zs) )
{
std::cout << "succeed" << std::endl;
// xs,ys,zs contain the strings. parse fails if more than 3 strings are on the line
}
}
This is how I would solve it. 这就是我解决它的方法。 You can pick your way to parse the data. 您可以选择解析数据的方法。
I have worked with that before and something I would do is like the code below where you read your text file line by line and use getline and a string to put the twext into variables. 我之前已经使用过,我会做的就像下面的代码,你逐行阅读你的文本文件,并使用getline和一个字符串将twext放入变量。 You don't have to ue an array as it is limited to the elements but use a vector and that way you can add dynamically. 您不必使用数组,因为它仅限于元素,但使用向量,这样您就可以动态添加。
string xs;
string ys;
string zs;
ifstream infile;
someArray[50];
infile.open("some file.txt");
if (!infile)
{
cout << "no good file failed! \n" << endl;
}
while (infile.good())
{
for (int i = 0; i < 49; ++i)
{
getline(infile, xs);
//Saves the line in xs.
infile >> p[i].xs;
getline(infile, ys, ',');
infile >> p[i].ys;
getline(infile, zs, ',');
infile >> p[i].zs;
}
//infile >> p.fromFloor; */
}
infile.close();
}
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