My program writes a vector to a file in binary. I want to erase the vector, then read the file to repopulate the vector then display.
Basically I want to erase the RAM memory and be able to use the file as memory. This is my current code but it is not reading the file correctly. I have checked the file to see that the writing part is working.
void read_from_file(vector<Info> &vector)
{fstream file;
file.open("info.dat", ios::binary | ios::in);
if (file.fail())
{
cout<<" FILE DOES NOT EXIST ";
system("pause");
How to store values from a .txt file delimited with semicolons (;) into a class which is then stored into a Binary Search Tree. After browsing Google for a few hours, and trying various examples of people using Vectors, I just can't seem to get my program to work using Object Oriented Programming with an instance of the class Person.
My two classes are Person, and BinarySearchTree as follows:
class Person{ private: string first_surname; string second_surname; string name; int ID;
[Code] ....
Ok so my text file saves the data of each person in the same order as the class with each value separated by a semicolon.
i.e. First_Surname;Second_Surname;Name;ID;Telephone;Score;
void fillTree( BinarySearchTree *b) { string input[7]; Person p; fstream file("scores.txt", ios::in); // reads text file if(file.is_open()) {
[Code] ....
I understand that I get an error because a vector is saved as integers, and I am using strings, my question is, any other way to read the .txt file and save each data separated by a semicolon, into the Person class?
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;
Below is the code for reading a struct that was stored in a binary file. Problem is while reading from file I get the name without first character and age is always equal to zero which it should not be.
if I want load the file as vector and I want to show on the screen using the new loop for why it only show the last lopp this is a example of my thought why is this not right?
int numb[3]; ifstream output; output.open("1.dat"); while(!output.eof()) { output>>numb[3]; } //assuming there are 3 number in vector for(int i=0; i<2;i++) { cout<<numb[i]; }
I'm reading a binary file and I want to read all of the letters, but I have noticed that it doesn't read all of the letters and I think it is because of appears as data.
Following is the program I wrote it basically takes 9 inputs and then save them into binary file. then print out the data stored in binary data and find inverse of it then print the inverse out. but its stuck in a loop somewhere.
Code: #include <stdio.h> int main() { int a[3][3],i,j; float determinant=0; int x; FILE *fp = fopen ("file.bin", "wb");
My binary file size is 88200000 bytes, but each element should have 2 bytes. So when I use "infile.read( block , size)" , should I be using the size of the file or number of elements (44100000)?
And should block be resized to the number of bytes or the number of elements?
why I'm giving "Access violation reading location 0x336827B8" and also I was able to read my data but it's giving me weird stuff. I want to write the sorted grades and the average in a new disk file. so here's my code so far here's my code
#include "stdafx.h" #include <iostream> #include <fstream> #include <string> #include <iomanip> using namespace std; int avg(int sum, int size); void swap(int *, int *);
I have a problem to read a large number of binary files, process them and store them under a new name. The program and routines go very well for 505 files. After reading 506 files, the program now refuses to read the next file. I have 16 Gb of memory and tried to close all other programs and restart the PC. it always stops after 506 files (512 files would be more understanding in a way...).
Here is my code. I have tried many things without success. This is only part of the loop that stops. The if test if (myfile.is_open() returns false by some reason. I can start the process again starting with the file that does not open and then it stops again after 506 files.
char * tfiBlock; ifstream myfile (OrigFilename, ios::in|ios::binary|ios::ate); if (myfile.is_open()) { int lengde = myfile.tellg(); tfiBlock = new char [lengde]; //static char memblock [size];
[Code] .....
Clean up procedure: delete[] tfiBlock;
Are there any limits to how many files that can be opened, or is it maybe someting to be set in the compiler?
Note: V_hChildStd_OUT_Rd is a handle to the output of program A.
After running the program although bSuccess becomes TRUE, Buf array does not include the number (12.54) that I am expecting. If I do the same process without using the binary format it works fine and I can read the number. I know somethings wrong with the writing or reading of binary data but I do not know what it is.
1. I have some vector<unsigned char> containing binary data. I would like to combine them into one std::string. How is the correct way to accomplish this?
This is my best guess for sample code:
Code: vector<unsigned char> data; //conatins some data vector<unsigned char> data2; //contains more data string temp(data.begin(), data.end()); temp.append(data2.begin(), data2.end());
Will this code work with binary data, or will it null terminate?
2. A similar problem.. I have some unsigned char* variables, and I want to combine them into one std::string. How can I accomplish this? will the member append() work here? or will it null terminate? Something like:
Code: unsigned char* data; //conatins some data unsigned char* data2; //contains more data string temp(reinterpret_cast<const char*>(data)); temp.append(string(reinterpret_cast<const char*>(data2)));
Will the above sample code work without null termination?
I have a cpp app that reads in a number of files and writes revised output. The app doesn't seem to be able to open a file with a ' in the file name, such as,
N,N'-dimethylethylenediamine.mol
This is the function that opens the file :
Code: // opens mol file, reads in rows to string vector and returns vector vector<string> get_mol_file(string& filePath) { vector<string> mol_file; string new_mol_line; // create an input stream and open the mol file ifstream read_mol_input; read_mol_input.open( filePath.c_str() );
[Code] ....
The path to the file is passed as a cpp string and the c version is used to open the file. Do I need to handle this as a special case? It is possible that there could be " as well, parenthesis, etc.
How to read and write an arbitrary number of bits from/to a file stream.
For instance, how to repeatedly read 9 bits from a file, then change to 10 bits, then 11 bits, and so on?
Obviously one way is by doing a lot of bit shifting, and masking. But honestly, I'm too dumb to get it right. Then I thought about using std::bitset and std::vector<bool>.
When i try to read it back from fstream again there are some symbols (binary obviously). How can i get my values back? I want to read those symbols and in a way to convert them to my old width and height values.
I need to know about image processing whether it can be done using C /c++ as I am not familiar with MATLAB. I have attached one image. The arrow in the image show the indented circular portion. I need to crop out only the portion inside the indented portion. I think there should be a sharp difference in gradient intensity in pixel at the indented portion. Is it possible to extract that portion out by reading the binary image?
