DosNewSize

This call changes the size of a file.

DosNewSize (FileHandle, FileSize)

• FileHandle (HFILE) - input : Handle of the file whose size is being changed.
• FileSize (ULONG) - input : File's new size in bytes.

rc (USHORT) - return

Return code descriptions are:

• 0 NO_ERROR
• 5 ERROR_ACCESS_DENIED
• 6 ERROR_INVALID_HANDLE
• 26 ERROR_NOT_DOS_DISK
• 33 ERROR_LOCK_VIOLATION
• 87 ERROR_INVALID_PARAMETER
• 112 ERROR_DISK_FULL

When DosNewSize is called, the file must be open in a mode that allows write access. If the file is a read-only file, its read-only status must be changed with DosSetFileMode before you can open the file for write access.

The open file can be truncated or extended in size. If the file is being extended, the file system makes a reasonable attempt to allocate the additional bytes for the file in a contiguous (or nearly contiguous) space on the medium. The value of the new bytes is undefined.

#define INCL_DOSFILEMGR
 
USHORT  rc = DosNewSize(FileHandle, FileSize);
 
HFILE            FileHandle;    /* File handle */
ULONG            FileSize;      /* File's new size */
 
USHORT           rc;            /* return code */

EXTRN  DosNewSize:FAR
INCL_DOSFILEMGR     EQU 1
 
PUSH   WORD    FileHandle    ;File handle
PUSH   DWORD   FileSize      ;File's new size
CALL   DosNewSize

Returns WORD

Text based on http://www.edm2.com/index.php/DosNewSize