Programming Forums > Application Development > C++

HelloWorld · Mar 16th, 2005, 1:21 AM

Hello, I have recently started working on a project which needs to read in all the .txt files in a folder. Currently the way it works is incredibly inefficient. The files are all saved in 'endresults-YEAR-MM-DD_HH-MM-SS.txt' format where YEAR is the year, MM the month, DD the day, HH the hour, MM the minute, and SS the second is the exact time you quit the program. Unfortunately the program doesn't know exactly what files to look for, so it iterates a loop for every second between 2004 and 2006. I never let this run to completion, but it would take around I day I would estimate - rending the program useless.

If someone could think of a more efficient way to check every combination it would be appreciated, or better yet if someone could tell me how to get all of the contents of a folder in C++ I think that would be the best route to go.

Ooble · Mar 16th, 2005, 10:44 AM

Straight from my C for Dummies book:

(Toggle Plain Text)

#include <stdio.h>
 #include <sys/types.h>
 #include <dirent.h>
 
 int main() {
     DIR *dir_handle;
     struct dirent *dir_record;
     
     dir_handle = opendir("."); // enter the directory you want to open here
     if (dir_handle == NULL) {
         printf("Error opening directory.\n");
         return 1;
     }
     
     while ((dir_record = readdir(dir_handle)) != NULL) {
         // dir_record->d_name contains the file name
         printf("%s\n", dir_record->d_name);
     }
     
     closedir(dir_handle);
     
     return 0;
 }

HelloWorld · Mar 16th, 2005, 11:34 PM

dirent.h, no such file or directory

any ideas? thanks for trying though

Ooble · Mar 17th, 2005, 11:38 AM

What compiler are you using?

HelloWorld · Mar 19th, 2005, 2:09 PM

Just to bring closure to this thread I use Visual Studio .NET 03.

I found that FindFirstFile and FindNextFile works great for this.

kurifu · Mar 19th, 2005, 5:17 PM

Those functions should work, be aware they are part of the Windows API so you are now compiling a dependancy for Windows. If this is assignment or something your school may not be too fond of that

Mar 16th, 2005, 1:21 AM	#1
HelloWorld Newbie Join Date: Mar 2005 Posts: 4 Rep Power: 0	File Input Problem Hello, I have recently started working on a project which needs to read in all the .txt files in a folder. Currently the way it works is incredibly inefficient. The files are all saved in 'endresults-YEAR-MM-DD_HH-MM-SS.txt' format where YEAR is the year, MM the month, DD the day, HH the hour, MM the minute, and SS the second is the exact time you quit the program. Unfortunately the program doesn't know exactly what files to look for, so it iterates a loop for every second between 2004 and 2006. I never let this run to completion, but it would take around I day I would estimate - rending the program useless. If someone could think of a more efficient way to check every combination it would be appreciated, or better yet if someone could tell me how to get all of the contents of a folder in C++ I think that would be the best route to go.

Mar 16th, 2005, 10:44 AM	#2
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Straight from my C for Dummies book: (Toggle Plain Text) #include <stdio.h> #include <sys/types.h> #include <dirent.h> int main() { DIR dir_handle; struct dirent dir_record; dir_handle = opendir("."); // enter the directory you want to open here if (dir_handle == NULL) { printf("Error opening directory.\n"); return 1; } while ((dir_record = readdir(dir_handle)) != NULL) { // dir_record->d_name contains the file name printf("%s\n", dir_record->d_name); } closedir(dir_handle); return 0; } #include <stdio.h> #include <sys/types.h> #include <dirent.h> int main() { DIR dir_handle; struct dirent dir_record; dir_handle = opendir("."); // enter the directory you want to open here if (dir_handle == NULL) { printf("Error opening directory.\n"); return 1; } while ((dir_record = readdir(dir_handle)) != NULL) { // dir_record->d_name contains the file name printf("%s\n", dir_record->d_name); } closedir(dir_handle); return 0; } __________________ Me :: You :: Them

Mar 17th, 2005, 11:38 AM	#4
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	What compiler are you using? __________________ Me :: You :: Them

Mar 19th, 2005, 5:17 PM	#6
kurifu Expert Programmer Join Date: Jul 2004 Location: Halifax, Nova Scotia (Canada) Posts: 784 Rep Power: 5	Those functions should work, be aware they are part of the Windows API so you are now compiling a dependancy for Windows. If this is assignment or something your school may not be too fond of that __________________ Clifford Matthew Roche <geek@cliffordroche.com> Web Hosting: http://www.crd-hosting.com Consulting: http://www.crdev-consulting.com

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Mar 16th, 2005, 11:34 PM	#3
HelloWorld Newbie Join Date: Mar 2005 Posts: 4 Rep Power: 0	dirent.h, no such file or directory any ideas? thanks for trying though

Mar 19th, 2005, 2:09 PM	#5
HelloWorld Newbie Join Date: Mar 2005 Posts: 4 Rep Power: 0	Just to bring closure to this thread I use Visual Studio .NET 03. I found that FindFirstFile and FindNextFile works great for this.

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Programming Forums > Application Development > C++

File Input Problem