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TEMPFILE.PRG
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1992-09-29
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/*
* File......: TEMPFILE.PRG
* Author....: Glenn Scott
* CIS ID....: 71620,1521
* Date......: $Date: 28 Sep 1992 23:48:48 $
* Revision..: $Revision: 1.7 $
* Log file..: $Logfile: C:/nanfor/src/tempfile.prv $
*
* This is an original work by Glenn Scott and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: C:/nanfor/src/tempfile.prv $
*
* Rev 1.7 28 Sep 1992 23:48:48 GLENN
* Deleted #define for FLAG_CARRY as Toolkit v2.1's ftint86.ch has it.
*
* Rev 1.6 03 Oct 1991 18:36:28 GLENN
* Tim Wong from Nantucket pointed out that this DOS function actually
* leaves a file handle in AX. In order to preserve the functionality,
* I now fclose() that handle if the call is succsessful.
*
* Rev 1.5 15 Aug 1991 23:05:04 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.4 17 Jul 1991 22:11:18 GLENN
* Stripped off chr(0)s in the return value (aRegs[DS])
*
* Rev 1.3 03 Jul 1991 01:08:08 GLENN
* Changed one line in FT_TEST driver ( cHide == "Y" )
*
* Rev 1.2 14 Jun 1991 19:53:10 GLENN
* Minor edit to file header
*
* Rev 1.1 12 Jun 1991 02:45:40 GLENN
* Documentation mods, and convert to new ft_int86() syntax, return value.
*
* Rev 1.0 01 Apr 1991 01:02:24 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_TEMPFIL()
* $CATEGORY$
* DOS/BIOS
* $ONELINER$
* Create a file with a unique name
* $SYNTAX$
* FT_TEMPFIL( [ <cPath> ] [, <lHide> ] ) -> cFileSpec
* $ARGUMENTS$
* <cPath> is the directory where you want to create the temporary
* file. If you omit this argument, the root of the current drive
* is assumed ("\").
*
* If <lHide> is .T., then the file will be created with the hidden
* attribute set. The default is .F.
* $RETURNS$
* <cFileSpec> should be your path, including the name of the newly
* created unique file. Use this with FOPEN(), etc.
*
* If a DOS error occurred when trying to create the file, a
* null string will be returned.
*
* $DESCRIPTION$
* This function uses DOS Interrupt 21, service 5Ah (Create temporary
* file) to create a unique filename in a directory you specify.
* There will be no extension. After the file is created, you may
* then fopen() it and do any i/o you need (see the test driver
* in the source code).
*
* This function requires FT_INT86().
* $EXAMPLES$
* Create a unique file in the root of the current drive:
*
* myFile := FT_TEMPFIL()
*
* Create a unique file in the current directory and hide it:
*
* myFile := FT_TEMPFIL(".\", .t.)
*
* Create a unique file on another drive, but do not hide it:
*
* myFile := FT_TEMPFIL("e:\nanfor\src\")
* $END$
*/
#include "FTINT86.CH"
#define DOS 33
#define TEMPNAME 90
#ifdef FT_TEST
FUNCTION MAIN( cPath, cHide )
LOCAL cFile, nHandle
cFile := FT_TEMPFIL( cPath, (cHide == "Y") )
if !empty( cFile )
QOut( cFile )
nHandle := fopen( cFile, 1 )
fwrite( nHandle, "This is a test!" )
fclose( nHandle )
else
Qout( "An error occurred" )
endif
RETURN nil
#endif
FUNCTION FT_TEMPFIL( cPath, lHide )
LOCAL aRegs[ INT86_MAX_REGS ], cRet
cPath := iif( valType(cPath) != "C", ;
repl( chr(0),12) , ;
cPath += repl( chr(0), 12 ) ;
)
lHide := iif( valType(lHide) != "L", .f., lHide )
aRegs[AX] := MAKEHI( TEMPNAME )
aRegs[CX] := iif( lHide, 2, 0 )
aRegs[DS] := cPath
aRegs[DX] := REG_DS
FT_INT86( DOS, aRegs )
/* If carry flag is clear, then call succeeded and a file handle is
* sitting in AX that needs to be closed.
*/
if !ft_isBitOn( aRegs[FLAGS], FLAG_CARRY )
fclose( aRegs[AX] )
cRet := strtran( aRegs[DS], chr(0) )
else
cRet := ""
endif
RETURN cRet