Get the position of the file pointer.
long _tell( int handle );
__int64 _telli64( int handle );
| Routine | Required Header | Compatibility |
| _tell | <io.h> | Win 95, Win NT |
| _telli64 | <io.h> | Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
A return value of –1L indicates an error, and errno is set to EBADF to indicate an invalid file-handle argument. On devices incapable of seeking, the return value is undefined.
Parameter
handle
Handle referring to open file
Remarks
The _tell function gets the current position of the file pointer (if any) associated with the handle argument. The position is expressed as the number of bytes from the beginning of the file. For the _telli64 function, this value is expressed as a 64-bit integer.
Example
/* TELL.C: This program uses _tell to tell the
* file pointer position after a file read.
*/
#include <io.h>
#include <stdio.h>
#include <fcntl.h>
void main( void )
{
int fh;
char buffer[500];
if( (fh = _open( "tell.c", _O_RDONLY )) != -1 )
{
if( _read( fh, buffer, 500 ) > 0 )
printf( "Current file position is: %d\n", _tell( fh ) );
_close( fh );
}
}
Output
Current file position is: 434