rsalunkhe
asked on
Program to read filenames in a directory
Hi,
I am trying to write a code (using the vc++ compiler) to read the filenames in any given directory in the windows system and then write the list of filenames in a text file.
Example-
Suppose i have a directory "c:\temp" with the files a.txt,b.dll,c.jpg etc.
i give the program the directory to read as "c:\temp" , then i want my code to read the file names in this directory and then output a file list.txt containing the names of the files ( that is a.txt, b.dll, c.jpg.....)
I guess it will be a small piece of code but i do not know how to do it on windows.
[ i know it can be done on unix using opendir(),readdir() functions but these do not seem to be available in vc++ and do not know the equivalents]
Thanks
I am trying to write a code (using the vc++ compiler) to read the filenames in any given directory in the windows system and then write the list of filenames in a text file.
Example-
Suppose i have a directory "c:\temp" with the files a.txt,b.dll,c.jpg etc.
i give the program the directory to read as "c:\temp" , then i want my code to read the file names in this directory and then output a file list.txt containing the names of the files ( that is a.txt, b.dll, c.jpg.....)
I guess it will be a small piece of code but i do not know how to do it on windows.
[ i know it can be done on unix using opendir(),readdir() functions but these do not seem to be available in vc++ and do not know the equivalents]
Thanks
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akshayxx
that i found from some Previously asked questions, and it was acceptable to questioner , i hope this works for u also
The opendir(), readdir() etc. functions are available in c++ if you include the dirent.h library.
#include <stdio.h>
#include <dirent.h>
#include <vector.h>
#include <string.h>
#include <fstream.h>
int main() {
DIR *dir_p;
struct dirent *dir_entry_p;
dir_p = opendir("c:\\temp\\");
vector<string> filelist(0);
while (NULL != (dir_entry_p = readdir(dir_p)))
{
if (strcmp(dir_entry_p->d_nam
filelist.push_back(dir_ent
}
ofstream outfile("list.txt");
for (int i=0; i<filelist.size(); i++) {
outfile << filelist[i] << endl;
}
outfile.close();
return 0;
}
#include <stdio.h>
#include <dirent.h>
#include <vector.h>
#include <string.h>
#include <fstream.h>
int main() {
DIR *dir_p;
struct dirent *dir_entry_p;
dir_p = opendir("c:\\temp\\");
vector<string> filelist(0);
while (NULL != (dir_entry_p = readdir(dir_p)))
{
if (strcmp(dir_entry_p->d_nam
filelist.push_back(dir_ent
}
ofstream outfile("list.txt");
for (int i=0; i<filelist.size(); i++) {
outfile << filelist[i] << endl;
}
outfile.close();
return 0;
}
ASKER
Hi,
DarthNemesis , i do not have dirent.h but it does seem ur code will do the trick. Thanks for your feedback.
However akshayxx i used ur code and it worked for me. Thanks for your feedback too.
Just one question.... below is the code i am using with the extra lines of writing to a file. I was just wondering how can i give another location for the detination file list.txt?
If i use fopen("list.txt","w") it creates it in the location of the code directory. How do i write the output file to a location C:\Backup ?
fopen("C:\backup\list.txt"
-------------------
#include<stdlib.h>
#include<stdio.h>
#include<iostream.h>
#include<windows.h>
main()
{
BOOL Done; // Done searching for files?
HANDLE FndHnd = NULL; // Handle to find data.
WIN32_FIND_DATA FindDat; // Info on file found.
FILE *f;
if ((f=fopen("list.txt","w"))
{
cout<<"Unable to open the file";
return 0;
}
f=fopen("c:\list.txt","w")
FndHnd = FindFirstFile("E:\\*", &FindDat);
Done = (FndHnd == NULL); // Indicate we are done if nothing was found.
while (!Done)
{
cout << FindDat.cFileName << endl; // Print name of file found.
fputs(FindDat.cFileName,f)
fputs("\n",f);
Done = !FindNextFile(FndHnd, &FindDat);
}
if (FndHnd) // If there was anything found, then
FindClose(FndHnd); // Close the find handle
fclose(f);
}
---------------
Thanks,
Ranjit
DarthNemesis , i do not have dirent.h but it does seem ur code will do the trick. Thanks for your feedback.
However akshayxx i used ur code and it worked for me. Thanks for your feedback too.
Just one question.... below is the code i am using with the extra lines of writing to a file. I was just wondering how can i give another location for the detination file list.txt?
If i use fopen("list.txt","w") it creates it in the location of the code directory. How do i write the output file to a location C:\Backup ?
fopen("C:\backup\list.txt"
-------------------
#include<stdlib.h>
#include<stdio.h>
#include<iostream.h>
#include<windows.h>
main()
{
BOOL Done; // Done searching for files?
HANDLE FndHnd = NULL; // Handle to find data.
WIN32_FIND_DATA FindDat; // Info on file found.
FILE *f;
if ((f=fopen("list.txt","w"))
{
cout<<"Unable to open the file";
return 0;
}
f=fopen("c:\list.txt","w")
FndHnd = FindFirstFile("E:\\*", &FindDat);
Done = (FndHnd == NULL); // Indicate we are done if nothing was found.
while (!Done)
{
cout << FindDat.cFileName << endl; // Print name of file found.
fputs(FindDat.cFileName,f)
fputs("\n",f);
Done = !FindNextFile(FndHnd, &FindDat);
}
if (FndHnd) // If there was anything found, then
FindClose(FndHnd); // Close the find handle
fclose(f);
}
---------------
Thanks,
Ranjit
> fopen("C:\backup\list.txt"
\ is the escape character, and it has special meaning to a text string. If you want to use a literal \ character, you need to double up on the backslashes like so: fopen("C:\\backup\\list.tx
\ is the escape character, and it has special meaning to a text string. If you want to use a literal \ character, you need to double up on the backslashes like so: fopen("C:\\backup\\list.tx
DarthNemesis already answered the '\\' problem .. that will work ..
ASKER
Hi,
DarthNemesis , i do not have dirent.h but it does seem ur code will do the trick. Thanks for your feedback.
However akshayxx i used ur code and it worked for me. Thanks for your feedback too.
Just one question.... below is the code i am using with the extra lines of writing to a file. I was just wondering how can i give another location for the detination file list.txt?
If i use fopen("list.txt","w") it creates it in the location of the code directory. How do i write the output file to a location C:\Backup ?
fopen("C:\backup\list.txt"
-------------------
#include<stdlib.h>
#include<stdio.h>
#include<iostream.h>
#include<windows.h>
main()
{
BOOL Done; // Done searching for files?
HANDLE FndHnd = NULL; // Handle to find data.
WIN32_FIND_DATA FindDat; // Info on file found.
FILE *f;
if ((f=fopen("list.txt","w"))
{
cout<<"Unable to open the file";
return 0;
}
f=fopen("c:\list.txt","w")
FndHnd = FindFirstFile("E:\\*", &FindDat);
Done = (FndHnd == NULL); // Indicate we are done if nothing was found.
while (!Done)
{
cout << FindDat.cFileName << endl; // Print name of file found.
fputs(FindDat.cFileName,f)
fputs("\n",f);
Done = !FindNextFile(FndHnd, &FindDat);
}
if (FndHnd) // If there was anything found, then
FindClose(FndHnd); // Close the find handle
fclose(f);
}
---------------
Thanks,
Ranjit
DarthNemesis , i do not have dirent.h but it does seem ur code will do the trick. Thanks for your feedback.
However akshayxx i used ur code and it worked for me. Thanks for your feedback too.
Just one question.... below is the code i am using with the extra lines of writing to a file. I was just wondering how can i give another location for the detination file list.txt?
If i use fopen("list.txt","w") it creates it in the location of the code directory. How do i write the output file to a location C:\Backup ?
fopen("C:\backup\list.txt"
-------------------
#include<stdlib.h>
#include<stdio.h>
#include<iostream.h>
#include<windows.h>
main()
{
BOOL Done; // Done searching for files?
HANDLE FndHnd = NULL; // Handle to find data.
WIN32_FIND_DATA FindDat; // Info on file found.
FILE *f;
if ((f=fopen("list.txt","w"))
{
cout<<"Unable to open the file";
return 0;
}
f=fopen("c:\list.txt","w")
FndHnd = FindFirstFile("E:\\*", &FindDat);
Done = (FndHnd == NULL); // Indicate we are done if nothing was found.
while (!Done)
{
cout << FindDat.cFileName << endl; // Print name of file found.
fputs(FindDat.cFileName,f)
fputs("\n",f);
Done = !FindNextFile(FndHnd, &FindDat);
}
if (FndHnd) // If there was anything found, then
FindClose(FndHnd); // Close the find handle
fclose(f);
}
---------------
Thanks,
Ranjit
ASKER
thanks guys i appreciate the help.