Calculating file size

[croc]

Hello

Can anyone tell me how I can calculate the size of a file in bytes please.

Thanks

 

[Zyrenthian]

Using CFile::GetFileStatus and passing a CFileStatus struct to it will return all the info you are looking for.

Matt

 

[Zyrenthian]

Correction: That is CFile::GetStatus

matt

 

[croc]

Hello
Is CFile part of IOSTREAM.h or do i need to include another header, and how do I pass a CFilestatus struct?

 

[Zyrenthian]

Oh... you posted in the microsoft forum so I assumed you were using Microsoft Visual C++. CFile & CFileStatus are part of the Microsoft foundation classes (MFC) You could also use

fseek with a FILE pointer and use SEEK_END to get to the end of the file. When there, you can use ftell with the file pointer to return a long which will be the file size or -1 if an error occured.

Matt

 

[Zyrenthian]

Sorry, i missed the second 1/2 of the quesiton. If you are using MFC you just do:

CFile f;
f.Open(filename,CFile::modeRead);
CFileStatus fs;
f.GetStatus(fs);
long fileSize = fs.m_size;
f.Close();

Matt

 

[Leibnitz]

If you you are not using MFC,you can use this:

#include <iostream.h>
#include <windows.h>
void main()
{
WIN32_FIND_DATA file;
HANDLE hFile;
long bsize; // size of file in &quot;bytes&quot;
float kbsize;// size of file in &quot;kilobytes&quot;
if (( hFile = FindFirstFile( &quot;path_to_file&quot;,&file )) == INVALID_HANDLE_VALUE )
{
cout<<&quot;Invalid File Handle.&quot;<<endl;
exit(0);
}
bsize = file.nFileSizeLow;
kbsize = ( float )bsize/1024;
cout << file.cFileName <<&quot; &quot;<<bsize<<&quot; bytes &quot;<<kbsize<<&quot; kb&quot;<<endl;
}

you have to replace 'path_to_file' with your file path.

 

[Leibnitz]

just a little modification,i have forgot to close the &quot;search handle&quot;.

#include <iostream.h>
#include <windows.h>
void main()
{
WIN32_FIND_DATA file;
HANDLE hFile;
long bsize; // size of file in &quot;bytes&quot;
float kbsize;// size of file in &quot;kilobytes&quot;
if (( hFile = FindFirstFile( &quot;path_to_file&quot;,&file ))
== INVALID_HANDLE_VALUE )
{
cout<<&quot;Invalid File Handle.&quot;<<endl;
exit(0);
}
bsize = file.nFileSizeLow;
kbsize = ( float )bsize/1024;
cout << file.cFileName <<&quot; &quot;<<bsize<<&quot; bytes &quot;<<kbsize<<&quot; kb&quot;<<endl;
FindClose( hFile ); // close the search handle
}