C++ :: Loading Data From File To RAM?
Mar 29, 2013What is the most efficient (fastest) way to load data from a file on HDD to RAM? (which would allow to only load a limited section of that file - eg. load only half of the file etc.)
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C++ :: Loading Polymorphic Data From A File
Jun 11, 2014What is the best / most efficient way to load polymorphic data from a file? I thought you could have an enumeration and for each item to load from a file you could have an integer at the start specifying the type of data, but I think there must be a better way I'm just not sure what.
Example of what I mean:
//The syntax isn't really that important for explanation
class base;
class a: base, b: base;
enum polymorphicType {
A,
B
};
and in the loading code you would have (this is the bit I think could be improved):
polymorphicType t;
File >> t;
if(t == A) {
newObject = new A;
} else if(t == B) {
newObject = new B;
}
I think there is probably a more efficient/better way of doing this I am just unaware of it.
C/C++ :: Loading Int Data From File To 2D Array
Apr 28, 2014Heres what I am suppose to do, So it doesnt seem hard to understand my messy code!
1. Gotta load the file "FactoryData.txt"
2. Load all values in my 2D array (array[5][3])
3. Print out the array to ensure that the copying went by well.
Heres my problem:
1. The for loops is REALLY off in my eyes. From my knowledge (correct me if im wrong), its suppose to be for(r=0;r<5;r++) not <=. BUT somehow im getting the results I want (in terms of formatting). HERE IS MY OUTPUT
Quote
300 450 500 510
510 600 750 627
627 100 420 530
530 621 730 200
200 50 58 100
100 83 4 5
Press Enter to return to Quincy...
C/C++ :: Loading Data From Text File Into Array
Jan 25, 2015I am currently working on a project that requires me to "load the data in the file into array at the beginning of the program."
I have a text file with data, and I need to populate an array with the information. From then on, I am supposed to be able to add, display, and search that array. However, I can't figure out how to add the data from the file into an array. I was trying to find out how to search the text file itself. So it threw me off balance and I've been staring so long at the screen I can't really focus.
C++ :: Pointer-based Data Loading From A (text) File
Dec 4, 2013I have two classes, productListType and buyerListType, that are each basically linked lists. To create the linked list for an object of productListType, I successfully wrote a non-class function createProductList to read the product data from a text file. The class definition for buyerListType has a data member productBoughtRecord that is of type productListType to aggregate the details of the products purchased by a particular buyer during transactions. I decided to make productBoughtRecord a pointer since the contents of this data member would wax and wane over the course of several transactions, depending on the amount and frequency of payments made by the buyer. I have provided a rough sketch of the class below:
class buyerListType
{
public:
setCustomerInfo( ....., productListType* p);
.
.
.
private:
productListType* productBoughtRecord;
.
.
};
I'm similarly trying to write a non-class function createBuyerList to load the record of customers from a text file. How do I determine what the value of the formal parameter p in member function setCustomerInfo is, in order to be able to set the data member productBoughtRecord? take into consideration that an object of class buyerListType would have multiple buyers with varying amounts of products purchased.
C :: Ferry Loading Using Two Queues - Can't Enter In Data After First Set Is Scanned
Feb 25, 2014I'm trying to solve the ferry loading problem using two queues. My problem is I can't enter in data after the first set is scanned in, I'm assuming there is a problem with my loop, such that the scan function doesn't get called after one iteration. In the example I marked the data I can't enter. An example correct input would be:
correct input:
1 - can enter data20 4 - can enter data
380 left - can enter data
720 left - can't enter data
1340 right - can't enter data
1040 left - can't enter data
correct output: 3
my incorrect output: 1
Code:
#include <stdio.h>
#include <stdlib.h>
#include "my_linked_list.h"
#include "my_linked_list.c"
#include "status.h"
[Code] ....
C++ :: Loading A Vector From A File?
May 21, 2014Alright i have my program and it loads the vector fine and even puts the vector into a txt file but when it comes to lloading it again im not sure if it works or not
#include <iostream>
#include <string>
#include <fstream>
[Code]....
C/C++ :: Loading 2D Array From A File?
Sep 10, 2014The program is supposed to read in a text file, load it into an array and assign a character to each number in the array (so for this I'm thinking I'll be creating 2 arrays, an int array with the numbers read in from the file, and a char array with the characters assigned to the numbers). It will then print these two arrays. It's then supposed to go through the initial int array and search for any numbers whose values differ from their neighboring values by more than one, if such a value is found, it's supposed to give the number the value of the average of it's neighboring values. It's supposed to make all these corrections and then assign characters to these corrected numbers and print out both arrays.
How to load the array from the file. My textbook seems to do a good job of covering arrays and files, but it doesn't really bring them together and talk about building arrays from files. Here is what the file looks like, the first number is the size of the array.
10
7 6 9 4 5 4 3 2 1 0
6 5 5 5 6 5 4 3 2 1
6 5 6 6 7 6 8 4 3 2
1 5 6 7 7 7 6 5 4 3
5 5 6 7 6 7 7 6 5 9
5 6 7 6 5 6 6 5 4 3
5 6 7 9 5 5 6 5 4 3
5 5 6 7 6 6 7 6 5 4
5 9 5 6 7 6 5 0 3 2
5 5 5 5 6 5 4 3 2 7
And here is the code I have so far:
#include <iostream>
#include <fstream>
using namespace std;
[Code]....
When I attempt to compile this (I'm working on a Linux system), I'm getting several errors:
prog1.cpp: In function ?int main()?:
prog1.cpp:37: error: expected unqualified-id before ?[? token
prog1.cpp:39: error: ?numArray? was not declared in this scope
prog1.cpp:39: error: expected primary-expression before ?]? token
C/C++ :: Loading File With Fscanf?
Apr 21, 2015I am trying to copy the stats from the save file "lol.txt" to main. I posted what the contents of the file below, but for some reason the I get for output jiberish and I cannot seem to figure out why.
#define _CRT_SECURE_NO_WARNINGS
#define MAX_NAME 31
#include <stdio.h>
int main(void){
char sName[MAX_NAME];
[Code] .....
C :: Loading Text File To Array
Jul 19, 2013I'm having troubles with loading my text file into my array.
Code:
int main(int argc,char* argv[]) {
if(argc!=3) {
printf("
Insufficient arguments
[code]...
I'm also suppose to return the size of the input at the end.
C++ :: Saving Object To File And Then Loading It
Jan 29, 2013Why my code is not working?
Interface
class Person{
private:
char name[80];
short age;
public:
void get_data();
[Code] .....
This is a simple example from and old Lafore C++ book, with a few tweaks by me. The point is simple. Save object person to a *.dat file, exit the program, then start up program again, open up *.dat file, and load contents.
The first problem is the compiler is printing a bunch of Asian characters to the file (is this normal?)
The second problem is, it's not loading the object as it should, giving me a bunch of gibberish.
C++ :: File Input Stream Not Loading?
May 9, 2014#include <cstdlib>
#include <stdio.h>
#include <string>
[Code]....
I'm trying to load a file input stream to load all the character content into a variable (say from a .java file for example), but for some reason whenever I type in the name of the file I want to stream I get the report: RUN FAILED (exit value 1, total time 2s)
C++ :: Loading File With Multiple Lines
May 17, 2014I'm trying to load a file that look like this:
IP:123.123.123.123
Port:12345
I can't figure out how to load multiple lines. I tried using , but I can't get it to work. Is there a better way of doing it than I am right now? This is my code.
char message[100];
int messageCount = 0;
for(unsigned int i = 0; i < file.size(); ++i) {
message[i] = file[i];
[Code] ....
C/C++ :: Loading A Structure From Configuration File
Mar 18, 2015I am doing a project in C++ - a simple data base (with "one table"). I want to build that data base using a LIFO or FIFO list, but this doesn't matter here
The only problem I have is that the structure of the data base is not "locked" in the code of the program, but when the program starts, it is "loaded / implemented" from a "configuration file" called "data.txt".
So the user, before she or he runs my program opens the file "data.txt" and writes the structure of the data base that se/he wants to create. This means that one time my program can be used to create a data base of students with fields such as "name / surname / gender / age / idnumber / university" but the next time it can be used for a data base of CD's with fields like - "author / release date / no. of tracks / etc.".
How to do that "loading" of a structure of a data base from a file, when the user runs my data-base creator (my C++ program).
C++ :: Manually Loading And Displaying BMP File
May 25, 2012I want to display a bmp file of resolution 600*420 (using c compiler like code block ) by manual loading. I tried to display the image by loading the pixel value. but this method has a limitation that it take up pixel value of image upto 64kb size.
So now i am trying to load it manually. What are the steps that i has to follow, what are the header files that i has to use ?
My system specification are windows xp professional , intel pentium 4 cpu. I don't know where to start ,does this method has any limitaton ,...etc ........
C++ :: Loading A Structure From A Configuration File
Mar 18, 2015I am doing a project in C++ - a simple data base (with "one table").
I want to build that data base using a LIFO or FIFO list, but this doesn't matter here . The only problem I have is that the structure of the data base is not "locked" in the code of the program, but when the program starts, it is "loaded / implemented" from a "configuration file" called "data.txt".
So the user, before she or he runs my program opens the file "data.txt" and writes the structure of the data base that se/he wants to create. This means that one time my program can be used to create a data base of students with fields such as "name / surname / gender / age / idnumber / university" but the next time it can be used for a data base of CD's with fields like - "author / release date / no. of tracks / etc.".
How to do that "loading" of a structure of a data base from a file, when the user runs my data-base creator (my C++ program).
C++ :: Loading Object Array From Input File?
Oct 13, 2014I'm struggling loading a class (and it's two derived classes) from an input file. I'm trying to create an array of class objects (and derived objects) and then load them based upon what is in the file.
Main class: Code: class Book
{
protected:
string sTitle;
[Code].....
Basically if the getline get's a P it's supposed to create a new object using the PrintedBook derived class and then store it to an array, if the getline get's to the "A" it's supposed to create an AudioBook object.
What I'm struggling with is writing something to parse the file line by line and create the objects on the fly and then store them into the array.
C++ :: Loading File Crashing Multiplayer Game?
Sep 4, 2014I've been making a multilayer game for a while and have a config that the game loads for the IP and stuff. I just recently put all the loading stuff into a function just so its easier to go through the code, but now the game isn't really working. It works fine on my computer connecting to the server myself, but when someone else tries to do it it seems like the game is working like it says the IP and everything from the config. When it tries to connect it either doesn't work or crashes just saying the program stopped working. Here is the code... I don't know if this is what is causing it to not work or something else.
string LoadConfig(int &loadPort, bool &fullscreen) {
string file;
string loadIP;
vector<string> fileLines;
fstream config("config.txt");
if (config.good()) {
[Code] ....
C/C++ :: Loading File In Windows Form - Richtextbox
Feb 7, 2015I want to load a file to rich text box component. I have this line:
richTextBox1->LoadFile("StudentaiRez.txt", RichTextBoxStreamType->PlainText);
But I get an error when I try to pass second parameter. It says : type name is not allowed.
I probably write it wrong, but I can't remember the correct way. In examples I only see that instead of -> dot is used, but it doesn't work either.
C Sharp :: How To Connect With Particular Database File (MDB) While Loading App
Aug 3, 2013I am developing a win form application with sq l server2005, in client system after install the application I created the folder for storing the database of running application, like that I have every year database separately, My doubt is how to connect the particular year database while loading the app?
View 1 Replies View RelatedC/C++ :: Loading TXT File To Convert Letters To Numbers And Export Again
Feb 5, 2015I have been playing around with .txt and .dat files lately. I only manage to load the files, but I don't seem to be able to load files using a variable.
Also modifying the data after it is imported is also currently problematic. I know how to go about the process without the need to import anything, but whenever I import the data I am having trouble modifying/ editing the ".txt" or ".dat" data.
Below is my current code:
#include <iostream>
#include <fstream>
#include <string>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
ifstream file;
ofstream result;
char in_file_name[8], out_file_name[8];
[Code] ....
Visual C++ :: Loading A File And Indexing Line Starts
Jun 14, 2013I've spent some time trying to performance test various methods of loading / accessing a file, either into memory or through a memory mapped file, but I am having some trouble.
FILE * pFile;
std::ifstream ifs;
MapViewOfFile
I'm have trouble because Windows appears to cache the file, so I am getting very mixed results. Sometimes a huge file (100's MB's) will load quickly, other times almost instantly.
How to stop Windows from doing whatever it's doing, so I can see the real time taken to load/access a file from disk?
C :: File Operations - Fwrite Padding Extra Data In File Compare To Data Provided As Input
Oct 28, 2014I am trying to write my files to another subfolder . Below is my program.
Code:
cat th6.c
#include <pthread.h>
#include <stdio.h>
#include <string.h>
#define SIZE 8
#define NUMELM 8
[Code] ....
I observe my filename along with directory as text in the new file created in sublfolder. This is output.
[cporgs/apue/threads]: mkdir first
[cporgs/apue/threads]: ./a.out test.txt first
test.txt -- first/test.txt
dfdfdfdfdfdfdf-14
dfdfdfdfdfdfdf-14
in thread test.txt first
[cporgs/apue/threads]: cat first/test.txt
dfdfdfdfdfdfdffirst/test.txt
[cporgs/apue/threads]: cat test.txt
dfdfdfdfdfdfdf
I could not able to get from where this filename and folder is getting added.
C++ :: Input Data From File / Write Data To File
Mar 8, 2013Ben has been administering a MBTI personality test. Now he has all the responses, but the task of scoring and compiling results seems daunting. The personality test* is a series of 70 questions for which the available responses are ‘A’ and ‘B’. Based upon the answers to the 70 questions, a personality profile is determined, categorizing the degree to which the responses place the person on four scales:
Extrovert vs. Introvert (E/I)
Sensation vs. iNtuition (S/N)
Thinking vs. Feeling (T/F)
Judging vs. Perceiving (J/P).
Each of the 70 questions relates to one of the four scales, with an ‘A’ response indicating the first of the corresponding pair (E, S, T, or J) and a ‘B’ indicating the second (I, N, F, or P). For instance, an ‘A’ response on the question: At a party do you:
A. Interact with many, including strangers
B. Interact with a few, known to you indicates an Extrovert rather than an Introvert; just the opposite for a ‘B’.
For this test, each question is designed to influence one of the four scales as follows:
questions 1, 8, 15, 22, 29 … are used to determine E/I,
questions 2, 9, 16, 23, 30 … and 3, 10, 17, 24, 31 … to determine S/N,
questions 4, 11, 18, 25, 32 … and 5, 12, 19, 26, 33 … to determine T/F, and
questions 6, 13, 20, 27, 34 … and 7, 14, 21, 28, 35 … to determine J/P.
Notice these come in sequences of “every 7th” question.
The goal of the test is to determine which end of each of the four scales a person leans, and to thus classify him/her based on those leanings (e.g., as ENFJ, INTJ, etc.). Since Ben would also like an indication of how strongly the test taker fell into each of the four, the program should print the percentage of ‘A’ responses for that scale.
Input for this program should come from a file responses.txt. The first line of the file will contain a single integer, n, indicating the number of test results to follow. Each of the following n lines will contain the first name of the test taker, a single blank, his/her last name, a single blank, then the 70 responses he/she gave on the test. Although the test instructions indicate that the results are most valid when all questions are answered, sometimes respondents leave questions blank. In that case, a dash appears at the corresponding place in the list of responses.
Output for the program should be written to the file types.txt. It should include a well-formatted report listing, for each test taker, his/her name, the percentage of ‘A’ responses in each scale, and the resulting personality type. A tie within a scale should result in a dash (‘-‘) for that part of the personality type.
C++ :: Stream Data To A File And Then Return To File To Add Further Data?
Aug 23, 2012I am trying to stream data to a file, and then return to the file to add further data. When I add data the second time, I then want to update the value of the second byte in the whole file. I can't seem to do this!
Here is my sample code:
Code:
int a = 1;
int b = 2;
int c = 3;
int d = 4;
int e = 5;
int f = 6;
int g = 7;
int x;
fstream out1("file.dat", ios::out | ios::binary | ios::trunc);
[code]....
The output I get is "1, 2, 3, 4, 5, 6", but I want to be getting "1, 7, 3, 4, 5, 6", because in "out2", I seekp to the second integar entry, and change it to "7".
I have also tried using ios::ate in the constructor for "out2", but this gives me the out put "4, 7, 6, 6, 6, 6", which is suggesting that when I create my fstream object "in", any seekg commands are relative to the beginning of the "out2" stream, rather than the "out1" stream.
C :: Store Data In Binary File Then Use It To Find Inverse Of Matrix Form Of Data
Dec 6, 2013I need to find inverse of a matrix data in binary file should be used to form matrix.its not finding inverse correctly rest is working good.
Code:
#include <stdio.h>
void createbin();
void display();
void inverse();
int main()
{
createbin();
display();
inverse();
[Code] ....
