Nbaztec: /* FileInput.cpp */

2010-06-23T13:58:43Z

‎FileInput.cpp

Daviddoria: Created page with '==FileInput.cpp== #include #include #include #include #include #include void ReadInt(const std::st…'

2010-06-23T12:24:59Z

Created page with '==FileInput.cpp== <source lang="cpp"> #include <iostream> #include <fstream> #include <vector> #include <string> #include <sstream> #include <cstdlib> void ReadInt(const std::st…'

New page

==FileInput.cpp==
<source lang="cpp">
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
#include <cstdlib>

void ReadInt(const std::string &Filename);
void ReadIntStringDouble(const std::string &Filename);
void VectorOfLines(const std::string &Filename);
void SkipComments(const std::string &Filename);

/* Example.txt
23
test
4.5
*/

int main(int argc, char *argv[])
{
std::string Filename = argv[1];

ReadInt(Filename);
//ReadIntStringDouble(Filename);
//VectorOfLines(Filename);
//SkipComments(Filename);
return 0;
}

void ReadInt(const std::string &Filename)
{
std::cout << "Filename: " << Filename << std::endl;

int Integer;

std::ifstream fin(Filename.c_str());

if(!fin )
{
std::cout << "File not found!" << std::endl;
exit(-1);
}

std::string line;
std::stringstream linestream;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Integer;

fin.close();

std::cout << "Integer: " << Integer << std::endl;
}

void ReadIntStringDouble(const std::string &Filename)
{
std::cout << "Filename: " << Filename << std::endl;

int Integer;
std::string String;
double Double;

std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

std::string line;
std::stringstream linestream;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Integer;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> String;

getline(fin, line);
linestream.clear();
linestream << line;
linestream >> Double;

fin.close();

std::cout << "Integer: " << Integer << std::endl;
std::cout << "String: " << String << std::endl;
std::cout << "Double: " << Double << std::endl;
}

void VectorOfLines(const std::string &Filename)
{

std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

std::vector<std::string> Lines;
std::string line;

while(getline(fin, line))
{
Lines.push_back(line);
}

for(unsigned int i = 0; i < Lines.size(); i++)
{
std::cout << Lines[i] << std::endl;
}

}

void SkipComments(const std::string &Filename)
{
/* test.txt
P3
# example comment
512 512
255

*/
std::ifstream fin(Filename.c_str());

if(fin == NULL)
{
std::cout << "Cannot open file." << std::endl;
}

char MV[2];//the first 2 ascii values
int width, height;
int MPV;//max pixel value

std::string line;

getline(fin, line); //get first line

MV[0] = line[0];
MV[1] = line[1];
std::cout << "MV[0] = " << MV[0] << std::endl;
std::cout << "MV[1] = " << MV[1] << std::endl;

line = "";
getline(fin, line); //get second line
std::string FirstChar = line.substr(0, 1);

if(FirstChar == "#")
{
std::cout << "Skipped this line." << std::endl;
}

line = "";
getline(fin, line); //get third line
std::stringstream LineStream;
LineStream << line;
LineStream >> width >> height;
std::cout << "Width = " << width << std::endl;
std::cout << "Height = " << height << std::endl;
LineStream.str("");

line = "";
getline(fin, line); //get fourth line

LineStream.str("");
LineStream.clear();
LineStream << line;
LineStream >> MPV;

std::cout << "MPV = " << MPV << std::endl;

}
</source>

@@ Line 22: / Line 22: @@
 int main(int argc, char *argv[])
+{
    std::string Filename = argv[1];
@@ Line 37: / Line 41: @@
    int Integer;
    std::ifstream fin(Filename.c_str());
-−
    if(!fin )
+   {
    std::cout << "File not found!" << std::endl;
    exit(-1);
+   }

CPP/IO/FileInput - Revision history

Nbaztec: /* FileInput.cpp */

Daviddoria: Created page with '==FileInput.cpp== #include #include #include #include #include #include void ReadInt(const std::st…'