C/C++ :: Reading And Writing PPM File Image

Dec 7, 2014

I am attempting to read a ppm file. When i do it i try to write it back in another file just to see how's done and i get a terrible result. I assume the problem is something with the casting i do to the variables.

This is my image class

Image:: Image(unsigned int width, unsigned int height, bool interleaved) {
buffer = new Component [3*width*height];
this->height=height;
this->width=width;
this->buffer=Component();

[Code] .....

View 4 Replies


ADVERTISEMENT

C/C++ :: Reading Image From A File?

Sep 30, 2013

How to read an image in C++ ...

All what i know that i may use a Cimage library but it doesn't really work or to read the image from a file ....

View 4 Replies View Related

C++ :: Reading And Writing Bit To A File

Nov 3, 2014

I'm writing a program using Huffman algorithm to compress text file. I have tested my program by just printing the printing ASCII character to file and it worked fine. However, now I have to implement using bits and my program doesn't work. It seems like I'm not reading or writing the right bits. Here is the result of my testing:In the input file I put abc the input file to compress it. Then I uncompress it the out out is aaa. Below is a snippet of how I read and write bits

Code:
class BitInput {
istream& in; // the istream to delegate to
char buf; // the buffer of bits
int nbits; public:

BitInputStream(istream& s) : in(s), buf(0), bufi(8) { }

[Code] ....

View 4 Replies View Related

C :: File Reading And Writing

Sep 19, 2013

I have a text file containing 500 signed decimal numbers. My task is to read each entry and convert into a 16-bit 2's complement representation (binary number) and write into the another text file.

View 2 Replies View Related

C :: Reading And Writing To File

Mar 19, 2013

Code:
#include <stdio.h>
struct hardware{
int recNum;
char toolName[30];
int quant;
double cost;

[Code] .....

I'm having issues with my functions working properly. I'm not sure where I'm going wrong with them and if i'm using the correct mode for the fopen.

View 6 Replies View Related

C++ :: Reading And Writing To The Same File?

Apr 30, 2013

Is there a way to read and write to the same file?

I'm writing a game program and I want to save the score at the end of the game to a txt file. The txt file already contains other game scores. How do I store the score without overwriting the previous scores.

I'm just using basic fstream.

View 2 Replies View Related

C/C++ :: Reading And Writing Bit To A File

Nov 3, 2014

I'm writing a program using Huffman algorithm to compress text file. I have tested my program by just printing the printing ASCII character to file and it worked fine. However, now I have to implement using bits and my program doesn't work. It seems like I'm not reading or writing the right bits. Here is the result of my testing:In the input file I put abc the input file to compress it. Then I uncompress it the out out is aaa. Below is a snippet of how I read and write bits

public:

BitInputStream(istream& s) : in(s), buf(0), bufi(8) { }
/** Read the next bit from the bit buffer.
* Return the bit read as the least significant bit of an int.
*/
int readBit(){
int i;
if(nbits == 8){
buf = in.get();

[Code] .....

View 2 Replies View Related

Visual C++ :: Reading Image File?

Apr 26, 2013

I have a jpg file. I have extracted the width and the length of the image. I have done that with some codes and markers. Now I need the image data starts as from that place i would like read the data and print the pixel value. I would like to display the pixels later.

View 2 Replies View Related

C++ ::  Reading And Writing To File Using Same Fstream

Oct 16, 2013

I have a file of data where each line consists of 4 parameters (degree, alpha, beta and x) and a value corresponding to these, organized in increasing order of the parameters. Here's the test file I'm using:

0 1 1 0.5 3.5
1 1 1 -0.5 -0.5
1 2 0 0.2 4.5
1 3 0 0.2 -4.5
2 0 0 1.5 2.1
2 1 0 0 5.6

My code is supposed to look for a certain set of parameters (currently set to 1 2 1 1.5, which is not contained in the file) and its value. If it's there (i.e. the file contains the value for the right parameters) the program is done. If not it should calculate the value using a function JacobiPoly() and insert the wanted parameters and corresponding value in the appropriate place in the file.

I have a code in which I think everything works except the writing to file. I use an fstream so I can both read and write and open it with ios::out||ios::in. I'm also aware I need something similar to fseek in between input and output but according to [URL] .... reading and writing to the same file using the same fstream, seekp() should suffice. I'm using seekp(), but the output (in the form inout << (...)) doesn't work.

Here's the code:

fstream inout;
inout.open("inouttest.dat", ios::out | ios::in);
int degree=1, readDeg;
double alpha=2, beta=1, x=1.5, value, readAlpha, readBeta, readX, readVal;
bool foundVal=false;
streampos beforeRead=(streampos)0;

[Code] ....

View 3 Replies View Related

C :: Writing Binary Data Or Reading From A File

Mar 6, 2013

I am having problems either writing data to a binary file or reading from the file. Through the process of elimination I am posting the code where the data is written to file to see if I can eliminate that as an option. I know the data is being processed correctly because, through the use of another function, I can view the data.

I also know that fwrite must be including some padding because the file size ends up being 576 bytes after it is written instead of 540 bytes (the size it would be if no padding is used). Here is my struct:

Code:

typedef struct {
char teams[25];
float wins;
float losses;
float pct;
int runsScored;
int runsAgainst;
} STATISTICS;

Here is where I initialize it:

Code:
STATISTICS stats[12] = {
{"Anaheim Arrays", 0.0, 0.0, .000, 0, 0},
{"Pittsburg Pointers", 0.0, 0.0, .000, 0, 0},
{"Indianapolis Integers", 0.0, 0.0, .000, 0, 0},

[Code] ....

And here is the function that writes my data. The sA array is only used to change the scheduled games based on the variable week.

Code:
void schedule(STATISTICS stats[]) {
FILE *f;
int sA[12], week = 0, runsPerGameA = 0, runsPerGameB = 0, runsAgainstA = 0, runsAgainstB = 0;
int index, a = 0, b = 1, i = 0;

[Code] .....

View 13 Replies View Related

C++ :: Reading And Writing Data In Text File

Jan 5, 2015

Code to write data(Double type e.g 12345.67891) in text file like pattern given below. Remember to put tab between each column.

-----------------------------------------------------
Column1 Column2 Column3
Value 1 Value 2 Value 3
Value 4 Value 5 Value 6
Value 7 Value 8 Value 9
----------------------------------------------------

& Also how to read data from this file.

View 3 Replies View Related

C++ :: Reading / Writing File On Multiple Threads?

Aug 7, 2013

I'm currently working on a server for handling clients in a 2d online game and I wrote some regular fstream file code for handling the file that stores their information and I was about to implement it into the server, then I realized there might be a problem having it open multiple times concurrently, so I googled it and came up with
posts like

[URL]

I'm wondering if I can just treat it like everything else or will I have to do something specific for opening on multiple threads?

p.s. I did read those posts but I'm very new to multithreading

View 16 Replies View Related

C++ :: Reading File Then Writing To It If Duplicate Not Found

Jan 22, 2014

I'm having issues with writing to a file. more precisely, i'm trying to determine if a set of numbers are in the file. if they are already in it, don't write to the file. if not, write to the file. My problem is my program is writing all numbers, even duplicates. The sort is working.

#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
//Counter Stats
int STR;

[code].....

View 9 Replies View Related

C++ :: Image / Video Compression Project - Error In Reading File

Apr 3, 2012

I have this image/video compression project that is to be done in C. I've been given this source code by my supervisor which is supposed to be a working one.

Assuming I have a sequence of 5 images in .pgm format (image41.pgm, image42.pgm .... image45.pgm). Some of the code involved is

Code:
#define START_FRAME 41
#define END_FRAME 45
#define SKIP_FRAME 1
#define INPUT_STRING "/home/folder/image%03d"
int main(){
int frameNo = START_FRAME
nx=1920, ny=1080;
char fileName[128];

[Code] ....

When I tried to compile the code using make file (shell script), I got this error message "In function 'readPgm' format '%d' expects argument of type 'int *', but argument 3 has type 'unsigned char *' "

Can identify what the problem is and how to rectify it?

View 10 Replies View Related

C++ :: Writing Integer Array To File In Binary Form And Reading It

May 30, 2013

Both arrays arr and pointers are the same size. I am having problems reading pointers from file into a new int array.

FILE* ky_pt=fopen("stashedclient","ab");
write(fileno(ky_pt), pointers, sizeof(pointers) );
pointerindex=lseek(fileno(ky_pt), 0, SEEK_CUR );
printf("pointerindex after writing array %d

[Code] .......

View 2 Replies View Related

C++ :: Reading GLOBE File - Access Violation Writing Location 0x00000001

Jan 15, 2015

I am working Visual C++ 2012. I am trying to read a GLOBE file using the following code.

#include "stdafx.h"
#include "iostream"
#include <stdio.h>
#include "stdlib.h"
#include "string.h"
#include "cmath"
#include <errno.h>
using namespace std;
/* Conversion useful */

[Code] ....

I am getting the error in the if condition (bold).

View 12 Replies View Related

C :: Visual Studio 2012 - Writing Data Into TXT File / How To Stop Reading Char

Feb 23, 2013

I am using visual studio 2012.....in below code i m writing data in to a test.txt file but i dont know with which key file stop accepting char...i tried ctrl+z and ctrl+d but not working ....

Code:
#include<stdio.h>
#include<conio.h>
main(){
char ch;
FILE *ptr;

[Code] ....

View 7 Replies View Related

C++ :: Writing Image Data To Disk In Parallel?

Apr 21, 2012

Basically, I want to write an image to disk in parallel with an algorithm that is processing that same image. The code is really simple:

Code:
string ProcessImage(System::Drawing::Bitmap ^bmp, System::String^ targetFile) {
bmp->Save(targetFile);
System::Drawing::Bitmap^ bmp8 = BitmapConvertPixelFormat(bmp, 8); //<-- a function I wrote which converts the 32bpp I am passed into an 8bpp one
string results = Analyze(bmp8); //<--- takes a good bit of time
return results;
}

What would be the fastest way to do this? Any libraries with a code sample. I would prefer one that is within .NET or native C++ just to avoid having to link into many different libraries.

View 4 Replies View Related

C :: Writing Array Into File And Reading Array From File

Apr 20, 2014

i've been trying to write array into file and read them into the same program again, but the output is all wrong.

Code:

#include<stdio.h>
int main()
{
FILE *fp;
char name[3][7];
int x;
}

[code]....

View 1 Replies View Related

C :: Reading PPM Image Into 1D Or 2D Array

Apr 4, 2013

I have an assignment where I need to take an assigned image, rotate it 90 degrees to the right, flip it upside down, and turn it to grayscale; each with different outputs.

I was thinking if I can read in the image into a 2d array //array[height][width] or even just an array with the values of each pixel (r, g, b), I can just modify the array and spit it out when done.

if i can just get it into the array, I think I'll be fine. We've done similar assignments with modifying arrays for grayscale images and the other two I can probably figure out. But how am I going to read in each pixel into an array with three different values in each slot? This is my code so far:

Code:
#include<stdio.h>

View 1 Replies View Related

C++ :: Reading And Writing Files?

Feb 20, 2015

I have to write a program that sorts names and grades from a file and output them to another.

For example:

Name: Peter Parker
Exam 1: 95
Exam 2: 90.625
Exam 3: 91.20

Name: Mary Smith
Exam 1: 65
Exam 2: 79.1234
Exam 3: 70.24

Becomes something like this in the output file:

Name: Parker, Peter
Average Score: 92.28
Grade: A

Name: Smith, Mary
Average Score: 71.45
Grade: C

I know I'm supposed to read the whole file, but I'm getting really confused on how to take the name of each student separately without recording Exam 1, 2, and 3. I'll be able to do the average score and grade on my own.

View 2 Replies View Related

C++ :: Login With TXT Writing / Reading

Oct 28, 2013

I have to make a program that asks for your username (any)to register it. When you type it it will say something. I want to create a txt file also. so this is what I have:

#include <iostream>
#include <fstream>
using namespace std;
int main() {
int a;
{
ofstream myfile;

[Code] ....

now, how can I use the cout again to print something "Welcome to the program..."?

View 1 Replies View Related

C/C++ :: Reading And Writing Files

Jan 16, 2015

I'm messing around with reading and writing files. The first file creates a small txt file. Simple enough

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main(){
string name;
string desc;

[Code] ....

It does what it should. It creates a text file "items.txt" .... It reads as such:

dagger,a dagger,15,10,0,1,3,1,0,0,0,1,0,0,0,0,0,1

The second file is meant to read the file and place the data back into the variables. This happens, but the data crams itself into the first variable, and the rest of them collect the trash that's in memory.

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
string name,desc;

[Code ....

I need to get "dagger" into name, "a dagger" into description, and each value with their perspective variable. I'm sure I need some type of "separator". Hopefully I can use the comma. Before it's over, I will have about a hundred items that will need to be read into a class of items.

View 4 Replies View Related

C :: Reading PPM Image Into 2 Dimensional Array

Nov 29, 2014

I'm trying to read a PPM image into an array. The header will have already been read in and I'm trying to put in a 2-d array to make manipulations easier. This is the code I have so far with LOTS of errors and warnings and I honestly don't know what almost any of them mean.

Code:

int imageArray( FILE *input, struct pixel *theArray ){
int i, j;
int col, row;
int *imageArray = (int**)malloc(row * sizeof(int*));
for(i=0; i<row; i++){

[Code]...

View 3 Replies View Related

C :: Program Reading / Writing Files

Dec 10, 2013

program that I am working on. I want to use fgets() in my program so I could handle multiple words from a text(to be able to handle spaces). I get a weird result when running the program.

Code: #include <stdio.h>
#include <stdlib.h>
//#include "kim.h"
#include <string.h>
[code]....

View 4 Replies View Related

C++ :: Vectors And Reading / Writing Files

May 19, 2014

How to write the code for this with the following requirements:

download the text file weblog.txt

This file is an Apache web log taken from the web server for St. Mary's University. When a visitor goes to their web site, the visitor's browser makes a request to the web server to view a web page, which is a file residing on the server. Each time a page is requested by a browser, the web server records information about that request. This weblog.txt holds the details of some of those requests.

Create a non-member function to read each line of the web log file. This function must do error checking to ensure that the file is opened successfully, otherwise it must provide a message like "file not available" to the user.

Each line should then be stored in a vector such that the first element of the vector is the first line of the web log file. Because each element will hold an entire line from the file, the vector should be declared as a vector of strings.

Note: You must declare the vector in a function.

Create another non-member function to sort the contents of the vector. Make sure to pass the vector by reference or your sort will disappear when the function ends! Use the sort function with #include <algorithm> to do the sort; you do not have to write your own sort algorithm.

Create one more non-member function to write the contents of the vector to a file. Each element should be on its own line in the new file. The contents of the new file should look like the original input file once your program completes, but in sorted order.

Create a main function that calls all of your non-member functions.

View 2 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved