I am using stat command to check the existence of a file in a directory.
The directory is having some 10K files. I feel the stat() call is expensive as i do not need the structure to be populated.
I want only the existence of the file.
Is there any other alternative faster way to do this in C.
I have this code to check if file exist already and its work, but what i need is : is to add feature to function to see if the file already exist open same file and rename it with another name ,probably file2
assume file name is "abc.c"
This scenario like this
User>>(provide file name)
Code>>(check if file already exist show msg:
"File already (abc.c) exist would you like to create another file and rename it ("abc2.c") "maybe it need loop to search directory "????
User>>if press yes ok it will make another file with another name but if no exit the function and dont create another file
Code: // function to check file existence and here what i need to add the feature above
int fExist(const char* fn){
struct stat buffer;
int exist = stat(fn,&buffer);
if(exist == 0)
[Code] .....
Just wonder is it possible that if the file exist, this function below will fail by returning non-zero value?
_access( INIFilename, 00 )
00 - check for Existence only
I noticed that sometimes if even the file exist, the function will fail or return non-zero value. So trying to find out and duplicate this error. It tends to happen intermittently. How can I find out what causing this error?
Code:
char INIFilename[256]="C: emp est.ini";
unsigned long Error = 0;
if( _access( INIFilename, 00 ) != 0 ) {
Error= GetLastError();
printf ("Failed to access INI file %s (%ul)", INIFilename, Error);
}
while bytesremaining >=8 do something;
if bytesremaing <8 then something else .
I am new and don't know how to code for this.
I'm having a little problem with std:fstream - in my program, the user selects the location of a file which I want to remember. So, I have something like this:
Code: std::string fileLocation;
//Code here creates an 'open file' dialog box which lets the user choose which file to open.
//The string 'fileLocation' now contains the path to the chosen file.
std::ofstream prefs("prefs.txt");
if (prefs.is_open())
{
prefs << fileLocation;
prefs.close();
}
This works fine if the file chosen is in the same directory as the program, however, if they try to choose a directory outside of where the program is kept, it saves the text file into that directory instead of the same one as the program. So, it looks like outputting a directory into an ofstream actually changes the location to which the file is saved.
Is there a way to save the file directory to a text file using ofstream and still have the text file save in the same directory as the program?
I had a quick question about how to check the balance of brackets in an HTML file using a stack (pushing and popping). I understand pushing and popping. I get lost when it comes to the logic of having to actually check what is in the brackets, and making sure those are nested correctly.
So while
<title><b> THIS FILE </b> USES CORRECTLY NESTED TAGS </title>
is correct and
<title> <b> THIS FILE </title> IS </b> NOT NESTED CORRECTLY.
is incorrect;
How do I check for the actual tags inside the brackets, keeping in mind that there are single sided tags as well.
(ex. <img src="a.jpg"/>)
I need my Unix program to generate a directory with a format like this: "hinesro.<pid>". I have some code that mostly works, except for the directory ends up with a question mark on the end, like this: "hinesro.12345?". I need it to just display the directory without this question mark. Here is my code:
Code:
// Using headers sys/types.h, sys/stat.h, unistd.h, and stdio.h
int pid = getpid();
char prefix[] = "hinesro.";
char fileName[0];
sprintf(fileName, "%s%d
", prefix, pid);
[Code]...
I have problems opening a file within a directory.
#include <dirent.h>
#include <string>
#include <vector>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
[Code] .....
Error Message:
$ ./dirsearch ~/Documents/College/textfiles/
[..]
[yomama.txt]
Error : Failed to open entry file - No such file or directory
Here are my current file permissions:
textfiles$ ls -l
total 8
-rw-rw-rw- 1 jav jav 7 Apr 26 13:14 moretext.txt
-rw-rw-rw- 1 jav jav 10 Apr 26 12:38 yomama.txt
I try to get file names listed by date or name in c. How can i do this.
There is a code: But this gives randomly file names.
DIR *dir;
struct dirent *ent;
dir = opendir ("c:src");
if (dir != NULL) {
/* print all the files and directories within directory */
[Code] ....
My code is not moving past the line below...actually i am making a quiz and this piece of code id checking whether the entered answer is correct, from a file..
getline(anss,saveans);
while(a<1) {
getline(anss,saveans);
if (saveans == ToString(randNum)) {
getline(anss,saveans);
if (saveans == ans)
[Code] ....
I have my libraries in ../../lib location
and when i try to compile :
gcc -O9 -I ../../include/ -L ../../lib/ -o test test.c thr.o -lm -lthread
I get :
gcc: error: thr.o: No such file or directory
obviously the problem is the library path location but my obj is there
ls -al ../../lib/ | grep thr.o
-rw-rw-r-- 1 xxxxxx xxxxxx 23544 Aug 12 23:03 thr.o
????
When I write a code in c++ includes thread library it says "thread:no such file or directory". How can ı use thread library .
I think I should download boost or c++11 but I couldn't do it .
I am trying to substitute a variable for the file directory. Here is the error: error: no matching function for call to 'std::basic_ ofstream <char>:: basic_ ofstream(std::string&)'
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <stdio.h>
#include <windows.h>
using namespace std;
[code]....
I'm quite new to C++ and got a problem of reading some files from a directory. All files is pure text, and I have no problem in reading these.
My problem is that I always have to read the oldest file without knowing the filename, and then move it to another directory and so on. Is it possible to use the timestamp instead of the filename to access the right file - read it and then move it to another directory?
Convert this code into one where you can input the file directory from the console?
#define WIN32_LEAN_AND_MEAN // prevent windows.h from including "kitchen sink"
#include <windows.h>
#include <iostream>
#include <string>
using namespace std;
int main()
{LPCSTR Application = "C:Program FilesWindows Media Playerwmplayer.exe";
// Media file extension must be provided
// Paths are quoted
[Code] ....
This code works but the directory can only be changed from the code not the console.
I'm trying to compile this code which is a header file.
#ifndef CUBEMAP_H_INCLUDED
#define CUBEMAP_H_INCLUDED
#include "Texture.h"
#include <string>
class CubeMap : Texture {
[Code] ....
But I get the following error:
|9|error: expected ')' before 'Directory'|
How can i resolve this?
I keep running into this error, even though the first few times i built and ran something it worked perfectly, and since I'm new to CodeBlocks (or any IDE/Compiler for that matter) what to do.Any code i put in, it'll give me this error....
View 3 Replies View RelatedI'm trying to write a program that opens a directory and for each file in directory,it creates a thread. Inside of the thread,it reads the numbers in file.(one number in one line)And then calculates the average of these numbers. I write something like this;
void *calculate(FILE *piece){
int a,k=0,s=0,ort;
while(!feof(ayri)) {
a=fgetc(ayri);
s=s+a;
[Code] ....
When I run the programme,i get lots of errors like 'segmentation error' and some stuff about pthread_create. And I don't think the 'calculate' function is right.I don't know the right way to read numbers line by line.
I have a project that compiles fine with VS 2010. As I compile it with VS 2012 it generates the entitled error. Why?
View 5 Replies View RelatedI am facing a problem in C++,I want to execute a command in Command prompt from a specific path.I am able o select a path and execute cmd.exe using the function ShellExecute but the problem is after selecting the path I am not able to execute the command, the command is appearing on another command prompt.
View 4 Replies View RelatedI'm reading from stdin a line. With that line, I should open a new textfile with the first letter of that line on a certain directory. My code is the following :
Code:
int main() {
char line[BUFSIZ];
FILE *ptr_file;
int x;
while(fgets(line,BUFSIZ,stdin) != NULL){
[Code] ....
char caminho[] is the directory in which I want to create the text file and chave will be the first letter of the line in stdin.
How am I supposed to use strcat to get these two together in a string to then use ptr_file =fopen(caminho, "w");
I have two questions about C programming here :
1. I want to make a file in the program directory that can't be deleted by user out of the program make that file.for example if I make a file named "123.xyz" by the program named "text.exe" and then exit test.exe ,if I tried to delete the file 123.xyz I faced the error and I could not do it but by the test.exe program that make that file.
2. I heard about a function called "Parbegin()".any way i want to know is there any possible way to run two or more functions of a file.c together,like the parbegin function did an do in OS?
I know how to open a specific files by using
ifstream infile("something.txt");
but how do you let the user select an arbitrary file from the working directory?
I want to write a single line to a file and upload it as a .txt file to a server directory . I know the traditional way to upload a local file to a server
public bool ftpTransfer(string fileName){
try {
string ftpAddress = "test.com";
string username = "test";
string password = "test";
[Code] ....
is there anyway to change this so that I can write the contents of the file through the program and upload it directly without having a local file?
regex pattern that takes only directory without file name
private void txtDownloadRoot_Validating(object sender, CancelEventArgs e)
{
Regex driveCheck = new Regex(@"([a-zA-Z]:[^/:*;/:?<>|]+)|({2}[^/:*;/:?<>|]+)");
if (!driveCheck.IsMatch(txtDownloadRoot.Text))
[Code].....
I need to write a program that acts as a file manager for all the files and folders in the directory given as an argv parameter and all of its subdirectories. This means be able to move, rename, delete the files in the sub directories. Also I need to be able to store the structure of folders and files in a binary tree adt (I have one already). But I'm not sure what libraries to use with this and how do I open a directory is it like a file with fopen?
View 4 Replies View Related