files size to char[]

purefan · 04-03-2005, 05:22 PM

hello!
well I am under XP using VC++6.
So, I need to get the file size of a bunch of files into char[].

Code:

//Declaration of token:
char *token[512] = {0};

later token holds all the file names I need.
The way for getting a file's size I use is:

Code:

WIN32_FILE_ATTRIBUTE_DATA  wfad;
GetFileAttributesEx(TEXT("File.txt"), GetFileExInfoStandard, &wfad);
printf("Size of x.bat is %u\n", wfad.nFileSizeHigh);

but using a for loop doesnt work, it shows the very same value for every token[i].
so if I use:

Code:

//say the number of files is 16
for (int J=0;J<=15;J++)
{
WIN32_FILE_ATTRIBUTE_DATA  wfad;
GetFileAttributesEx(TEXT(token[J]), GetFileExInfoStandard, &wfad);
printf("Size-> %u\n", wfad.nFileSizeHigh);
}//for

it will show the same number for all the token[J].
how can I store the file sizes in token[] to a char[]??? (lets name it FileSizes[])

also if anyone knows what is nFileSizeHigh and nFileSizeLow that would hel me understand better what's going on.

thanks a lot! =D

crabboy · 04-03-2005, 06:38 PM

Lookiing back at some code that I wrote over 5 years ago, I found this:

Code:

            clsFileInfo.setFileSize
               ( 
                  (stWinFileData.nFileSizeHigh * MAXDWORD) + stWinFileData.nFileSizeLow
               );

In your examples, I'm guessing that the files are small and nFileSizeHigh is 0.

purefan · 04-03-2005, 07:14 PM

hmmmm....im sorry but I dont understand how to implement this...
my files are variable, so it is not always the same value...

crabboy · 04-03-2005, 07:20 PM

in the printf that you posted replace wfad.nFileSizeHigh with:

Code:

( wfad.nFileSizeHigh * MAXDWORD ) + wfad.nFileSizeLow

Dave Kelly · 04-03-2005, 08:04 PM

CAVEAT This code is untested.
Have you tried:

Code:

int n_read += n = read ( int fd, char *buf, int n )
              printf("The size of the file is:  %d\n", n_read  );

purefan · 04-03-2005, 08:22 PM

Crabboy: It worked for a manual insertion of the vector:

Code:

	GetFileAttributesEx(TEXT(token[1]), GetFileExInfoStandard, &wfad);
printf("Size of x.bat is %u\n", ( wfad.nFileSizeHigh * MAXDWORD ) + wfad.nFileSizeLow) ;

but not for a for loop:

Code:

	for (int aj=0;aj<=10;aj++)	
	{
	GetFileAttributesEx(TEXT(token[aj]), GetFileExInfoStandard, &wfad);
printf("Size -->%u\n", ( wfad.nFileSizeHigh * MAXDWORD ) + wfad.nFileSizeLow) ;
	}//for

Dave Kelly: it did not compile right away, I set it for

Code:

int n_read;
int n;
n_read += n = read ( int fd, char *buf, int n );
printf("The size of the file is:  %d\n", n_read  );

but read is undeclared, do I need to include a library??

[/code]

purefan · 04-03-2005, 09:34 PM

I found a function that works!!!!!!!!

Code:

// obtaining file size
#include <iostream.h>
#include <fstream.h>

const char * filename = "example.txt";

int main () {
 long l,m;
 ifstream file (filename, ios::in|ios::binary);
 l = file.tellg();
 file.seekg (0, ios::end);
 m = file.tellg();
 file.close();
 cout << "size of " << filename;
 cout << " is " << (m-l) << " bytes.\n";
 return 0;
}

it works very when assigning to an unsigned long[]!!!
so it is all solved now!!
I didnt use a handle or a complicated structure so it is great!!

Thanks all for the help!!