This is part of Family API which allow to create dual-os version of program runs under OS/2 and DOS

Note: This is legacy API call. It is recommended to use 32-bit equivalent

DosNewSize

This call changes the size of a file.

Syntax

DosNewSize (FileHandle, FileSize)

Parameters

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

Return Code

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

Remarks

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.

Example Code

C Binding

<PRE> #define INCL_DOSFILEMGR

USHORT rc = DosNewSize(FileHandle, FileSize);

HFILE FileHandle; /* File handle */ ULONG FileSize; /* File's new size */

USHORT rc; /* return code */ </PRE>

MASM Binding

<PRE> EXTRN DosNewSize:FAR INCL_DOSFILEMGR EQU 1

PUSH WORD FileHandle ;File handle PUSH DWORD FileSize ;File's new size CALL DosNewSize

Returns WORD </PRE>

Note

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

Family API
DOS	Process Manager	DosBeep DosExit DosSleep DosExecPgm
File Manager	DosChDir DosChgFilePtr DosClose DosDelete DosDupHandle DosMkDir DosMove DosQCurDir DosQCurDisk DosSetFileMode DosOpen DosQFileInfo DosRead DosQFileMode DosQFSInfo DosQVerify DosRmDir DosSelectDisk DosFindClose DosFindFirst DosFindNext DosSetFileInfo DosSetVerify DosWrite DosFileLocks DosSetFHandState DosNewSize DosBufReset DosQFHandState DosSetFSinfo DosShutdown
Memory Manager	DosFreeSeg DosSubAlloc DosSubFree DosSubSet DosAllocHuge DosAllocSeg DosReallocHuge DosReallocSeg DosGetHugeShift DosCreateCSAlias
NLS	DosCaseMap DosGetCtryInfo DosGetDBCSEv DosSetCtryCode DosGetCollate DosGetMessage DosInsMessage DosPutMessage
Date and Time	DosSetDateTime DosGetDateTime
Devices	DosDevConfig DosDevIOCtl DosDevIOCtl2
Signals	DosHoldSignal DosSetSigHandler
Misc	BadDynLink DosGetEnv DosGetMachineMode DosGetVersion DosError DosErrClass DosSetVec
KBD	KbdCharIn KbdFlushBuffer KbdGetStatus KbdSetStatus KbdStringIn KbdPeek
VIO	VioGetBuf VioGetConfig VioGetCurPos VioGetCurType VioGetPhysBuf VioReadCellStr VioReadCharStr VioScrollUp VioScrollDn VioScrollLf VioScrollRt VioScrUnLock VioSetCurPos VioSetCurType VioSetMode VioGetMode VioShowBuf VioWrtCellStr VioWrtCharStr VioWrtCharStrAtt VioWrtNAttr VioWrtNCell VioWrtNChar VioWrtTTY VioScrLock VioPopUp
Tools	BIND
Modules	DOSCALLS.DLL VIOCALLS.DLL KBDCALLS.DLL MSG.DLL
Libraries	API.LIB OS2386.LIB FAPI.LIB DOSCALLS.LIB SUBCALLS.LIB