copying files

[gls]

I am trying to copy files from one directory to another. What I don't know how to do is get a file name from a directory using ansi C.

Any help would be appreciated.

[Witch_King]

It depends on what compiler you are using. So what compiler are you using? If you are using VC++6 than you can do whatever you might want to do from the command prompt with the system command, for example run this (if you have VC++6):

#include<stdio.h>
#include<stdlib.h>

int main()
{
	system("dir c:");
	return 0;
}

[gls]

I am using MS VC++ 6. I tried the system function but all it does is print the directory to the screen. I still don't see how I can get the file names into a variable.

Thanks for your response.

Garth

[Witch_King]

#include<iostream>
using namespace std;

int main()
{
	system("dir c:\\ >> c:\\log.txt");
	return 0;
}

Put it into a text file first. Can you take it from there?
I don't want to show you how to create a computer virus. I hope thats not what you want the information for.

[Witch_King]

Ohh come on. Just use a switch

dir c:\\ /B

[gls]

Witch_King,

I already got your previouse response and I'm doing fine. I didn't post the last response you just replied to.

gls

[Witch_King]

#include<iostream>
using namespace std;

int main()
{
	system("dir /B c:\\ >> c:\\log.txt");
	return 0;
}

This could save some time. Notice the /B switch.

[Witch_King]

That way you just get the filenames. Nice and clean. Yup I got your email.

[Witch_King]

#include<stdio.h>
#include<stdlib.h>

int main()
{
	system("dir /B c:\\\"Program Files\" >> c:\\log.txt");
	return 0;
}

Also say you want to get into a folder with some spaces in the name. Than put a backslash before the quote like this.

[zen]

If you want to avoid using the slow system routine, since your using MSVC you could do something like this -

#include <windows.h>

int main() 
{ 
   char filename1[]="sourcedirectory\\*.*";
   char filename2[255]="targetdirectory\\";
   BOOL exists=0;
   HANDLE filehandle;
   WIN32_FIND_DATA find_data;

   filehandle = FindFirstFile(filename1,&find_data);
   strcat(filename2,find_data.cFileName);
   CopyFile(find_data.cFileName,filename2,exists);
   strcpy(filename2,"targetdirectory\\");

   while(FindNextFile(filehandle,&find_data))
   {
        strcat(filename2,find_data.cFileName);
        CopyFile(find_data.cFileName,filename2,exists);
        strcpy(filename2,"targetdirectory\\");
   }

 
    return 0;
} 

[Witch_King]

How does it work? What is the input?

[zen]

filename1 - the source directory + *.* (to indicate to FindNextFile() that all files are required).

filename2 - the target directory (which is then appended with the filename that FindFirstFile/FindNextFile produces).

[Witch_King]

int main() 
{ 
	char filename1[]="c:\\Temp\\*.txt";
   char filename2[255]="c:\\";
...

If I had a .txt file in the c:\temp directory isn't it supposed to copy it to the c:\ directory? Just trying to figure it out... Where did you go? I'm trying to get this thing to work...

[zen]

Sorry, FindFirstFile() doesn't return the full path name you'd have to something like this -

#include <windows.h>


int main() 
{ 
   char filename1[]="c:\\temp\\*.txt";
   char filename2[255]="c:\\";
   char fullpath[255]={0};
   BOOL exists=0;
   HANDLE filehandle;
   WIN32_FIND_DATA find_data;

   SetCurrentDirectory("c:\\temp\\");
   
   filehandle = FindFirstFile(filename1,&find_data);
   strcat(filename2,find_data.cFileName);
   GetFullPathName(find_data.cFileName,sizeof(fullpath),fullpath,0);
   CopyFile(fullpath,filename2,exists);
   strcpy(filename2,"c:\\");

   while(FindNextFile(filehandle,&find_data))
   {
        strcat(filename2,find_data.cFileName);
        GetFullPathName(find_data.cFileName,sizeof(fullpath),fullpath,0);
        CopyFile(fullpath,filename2,exists);
        strcpy(filename2,"c:\\");
   }

 
    return 0;
} 

[Witch_King]

Yeah, that son of a ***** worked. Good job. I'll keep this program.