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PROGRAM
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CLIPPER
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FIXAR3
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SAVEARR.PRG
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1993-12-17
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/*
* File......: SAVEARR.PRG
* Author....: David Barrett
* CIS ID....: 72037,105
* Date......: $Date: 28 Sep 1992 22:04:18 $
* Revision..: $Revision: 1.3 $
* Log file..: $Logfile: C:/nanfor/src/savearr.prv $
*
* This is an original work by David Barrett and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log: C:/nanfor/src/savearr.prv $
* Rev 1.4 17 Dec 1993 12:51:21 CHRISTOPHER OLSON 71212,72
* Revised FT_SAVEARR() to properly handle multi-dimensional arrays and
* Nil array elements. This function now gives the programmer the option
* of failing when encountering a compiled code block in the array or
* replacing the compiled code block with a default value. Also revised
* test code for the additions.
*
* Rev 1.3 28 Sep 1992 22:04:18 GLENN
* A few users have reported that these functions do not support
* multi-dimensional arrays. Until the bugs are verified and
* workarounds or re-writes devised, a warning has been placed in the
* documentation.
*
* Rev 1.2 15 Aug 1991 23:06:06 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:52:54 GLENN
* Minor edit to file header
*
* Rev 1.0 07 Jun 1991 23:39:38 GLENN
* Initial revision.
*
*
*/
MEMVAR lRet
#ifdef FT_TEST // test program to demonstrate functions
LOCAL bBlock := {|x| str(x,3)}
LOCAL aArray := { {'Invoice 1', CTOD('04/15/91'), 1234.32, .T., Nil, bBlock},;
{'Invoice 2', DATE(), 234.98, .F., Nil, bBlock},;
{'Invoice 3', DATE() + 1, 0, .T., Nil, bBlock} }, aSave
LOCAL nErrorCode := 0
?
? 'Should fail on first code block'
IF FT_SAVEARR(aArray,'INVOICE.DAT',@nErrorCode) .and. ;
nErrorCode = 0
DispArray(aArray)
aSave := FT_RESTARR('INVOICE.DAT',@nErrorCode)
IF nErrorCode = 0
DispArray(aSave)
ELSE
? 'Error restoring array'
ENDIF
ELSE
? 'Error writing array'
ENDIF
?
? 'Should not fail on code blocks'
IF FT_SAVEARR(aArray,'INVOICE.DAT',@nErrorCode,.F.,"WAS BLOCK") .and. ;
nErrorCode = 0
DispArray(aArray)
aSave := FT_RESTARR('INVOICE.DAT',@nErrorCode)
IF nErrorCode = 0
DispArray(aSave)
ELSE
? 'Error restoring array'
ENDIF
ELSE
? 'Error writing array'
ENDIF
RETURN
FUNCTION DispArray(aTest)
LOCAL nk
FOR nk := 1 TO LEN(aTest)
? aTest[nk, 1]
?? ' '
?? DTOC(aTest[nk, 2])
?? ' '
?? STR(aTest[nk, 3])
?? ' '
?? IF(aTest[nk, 4], 'true', 'false')
?? ' '
?? IF(aTest[nk, 5]=Nil, 'Nil', ' ')
?? ' '
?? if(ValType(aTest[nk, 6])='B', eval(aTest[nk, 6], nk), aTest[nk, 6])
NEXT
RETURN Nil
#endif
/* $DOC$
* $FUNCNAME$
* FT_SAVEARR()
* $CATEGORY$
* Array
* $ONELINER$
* Save Clipper array to a disc file.
* $SYNTAX$
* FT_SAVEARR( <aArray>, <cFileName>, <nErrorCode>,;
* [<lBlockFail>], [<xBlockDef>]) -> lRet
* $ARGUMENTS$
* <aArray> is any Clipper array except those containing
* compiled code blocks.
*
* <cFileName> is a DOS file name.
*
* <nErrorCode> will return any DOS file error.
*
* <lBlockFail> is an optional logical, .T. if a code block in
* the array should fail the save, .F. if xBlockDef should be
* saved in its place. The default is .T.
*
* <xBlockDef> is any Clipper value other than a code block to be
* saved in place of a code block if one is found in the array
* being saved and lBlockFail is .F. The default is Nil.
*
* All arguments are required.
*
* $RETURNS$
* .F. if there was a DOS file error or the array contained
* code blocks, otherwise returns .T.
* $DESCRIPTION$
* FT_SAVEARR() saves any Clipper array to a disc file. Compiled
* code blocks are not saved, but either return an error or save
* a specified data value in their place. The array can be
* restored from the disc file using FT_RESTARR().
*
* [10/1/92 Librarian note:
*
* This function does not appear to work with multi-dimensional
* arrays. If you'd care to modify it to support this feature,
* please do and send it to Glenn Scott 71620,1521.]
*
* [12/17/93 Revision note:
*
* I have revised this function to work with multi-dimensional
* arrays as well as to better handle code blocks. It turns out
* the multi-dimensions failed because of the way Nil values were
* saved. This function now gives the option of failing when
* encountering a code block or replacing the block with a default
* value. Christopher Olson 71212,72.]
*
*
* $EXAMPLES$
* aArray := { {'Invoice 1',CTOD('04/15/91'),1234.32,.T.},;
* {'Invoice 2',DATE(),234.98,.F.},;
* {'Invoice 3',DATE() + 1,0,.T.} }
* nErrorCode := 0
* FT_SAVEARR(aArray,'INVOICE.DAT',@nErrorCode)
* IF nErrorCode = 0
* aSave := FT_RESTARR('INVOICE.DAT',@nErrorCode)
* IF nErrorCode # 0
* ? 'Error restoring array'
* ENDIF
* ELSE
* ? 'Error writing array'
* ENDIF
*
* $SEEALSO$
* FT_RESTARR()
* $END$
*/
FUNCTION FT_SAVEARR(aArray, cFileName, nErrorCode, lBlockFail, xBlockDef)
LOCAL nHandle, lRet
nHandle = FCREATE(cFileName)
nErrorCode = FError()
IF lBlockFail = Nil
lBlockFail = .T.
ENDIF
IF nErrorCode = 0
lRet := _ftsavesub(aArray, nHandle, @nErrorCode, lBlockFail, xBlockDef)
FCLOSE(nHandle)
IF (lRet) .AND. (FERROR() # 0)
nErrorCode = FERROR()
lRet = .F.
ENDIF
ELSE
lRet = .F.
ENDIF
RETURN lRet
STATIC FUNCTION _ftsavesub(xMemVar, nHandle, nErrorCode, lBlockFail, xBlockDef)
LOCAL cValType, nLen, cString
PRIVATE lRet // accessed in code block
lRet := .T.
cValType := ValType(xMemVar)
IF cValType = "B" .AND. .NOT. lBlockFail
xMemVar := xBlockDef
cValType := ValType(xMemVar)
ENDIF
FWrite(nHandle, cValType, 1)
IF FError() = 0
DO CASE
CASE cValType = "A"
nLen := Len(xMemVar)
FWrite(nHandle, L2Bin(nLen), 4)
IF FError() = 0
AEVAL(xMemVar, {|xMemVar1| lRet := lRet .and. _ftsavesub(xMemVar1, nHandle,, lBlockFail, xBlockDef) } )
ELSE
lRet = .F.
ENDIF
CASE cValType = "B"
lRet := .F.
CASE cValType = "C"
nLen := Len(xMemVar)
FWrite(nHandle, L2Bin(nLen), 4)
FWrite(nHandle, xMemVar)
CASE cValType = "D"
nLen := 8
FWrite(nHandle, L2Bin(nLen), 4)
FWrite(nHandle, DTOC(xMemVar))
CASE cValType = "L"
nLen := 1
FWrite(nHandle, L2Bin(nLen), 4)
FWrite(nHandle, IF(xMemVar, "T", "F") )
CASE cValType = "N"
cString := STR(xMemVar)
nLen := LEN(cString)
FWrite(nHandle, L2Bin(nLen), 4)
FWrite(nHandle, cString)
CASE cValType = "U"
nLen:=0
FWrite(nHandle, L2Bin(nLen), 4)
ENDCASE
ELSE
lRet = .F.
ENDIF
nErrorCode = FError()
RETURN lRet
/* $DOC$
* $FUNCNAME$
* FT_RESTARR()
* $CATEGORY$
* Array
* $ONELINER$
* Restore a Clipper array from a disc file
* $SYNTAX$
* FT_RESTARR( <cFileName>, <nErrorCode> ) -> aArray
* $ARGUMENTS$
* <cFileName> is a DOS file name.
*
* <nErrorCode> will return any DOS file error.
*
* All arguments are required.
* $RETURNS$
* Return an array variable.
* $DESCRIPTION$
* FT_RESTARR() restores an array which was saved to
* a disc file using FT_SAVEARR().
*
* [10/1/92 Librarian note:
*
* This function does not appear to work with multi-dimensional
* arrays. If you'd care to modify it to support this feature,
* please do and send it to Glenn Scott 71620,1521.]
*
* [12/17/93 Revision note:
*
* No revisions were made to this function, however, I have
* revised the FT_SAVEARR() function to work with multi-dimensional
* arrays as well as to better handle code blocks. It turns out
* the multi-dimensions failed because of the way Nil values were
* saved. Christopher Olson 71212,72.]
*
* $EXAMPLES$
* aArray := { {'Invoice 1',CTOD('04/15/91'),1234.32,.T.},;
* {'Invoice 2',DATE(),234.98,.F.},;
* {'Invoice 3',DATE() + 1,0,.T.} }
* nErrorCode := 0
* FT_SAVEARR(aArray,'INVOICE.DAT',@nErrorCode)
* IF nErrorCode = 0
* aSave := FT_RESTARR('INVOICE.DAT',@nErrorCode)
* IF nErrorCode # 0
* ? 'Error restoring array'
* ENDIF
* ELSE
* ? 'Error writing array'
* ENDIF
*
* $SEEALSO$
* FT_SAVEARR()
* $END$
*/
FUNCTION FT_RESTARR(cFileName, nErrorCode)
LOCAL nHandle, aArray
nHandle := FOPEN(cFileName)
nErrorCode := FError()
IF nErrorCode = 0
aArray := _ftrestsub(nHandle, @nErrorCode)
FCLOSE(nHandle)
ELSE
aArray := {}
ENDIF
RETURN aArray
STATIC FUNCTION _ftrestsub(nHandle, nErrorCode)
LOCAL cValType, nLen, cLenStr, xMemVar, cMemVar, nk
cValType := ' '
FREAD(nHandle, @cValType, 1)
cLenStr := SPACE(4)
FREAD(nHandle, @cLenStr, 4)
nLen = Bin2L(cLenStr)
nErrorCode = FError()
IF nErrorCode = 0
DO CASE
CASE cValType = "A"
xMemVar := {}
FOR nk := 1 TO nLen
AADD(xMemVar, _ftrestsub(nHandle)) // Recursive call
NEXT
CASE cValType = "C"
xMemVar := SPACE(nLen)
FREAD(nHandle, @xMemVar, nLen)
CASE cValType = "D"
cMemVar = SPACE(8)
FREAD(nHandle, @cMemVar,8)
xMemVar := CTOD(cMemVar)
CASE cValType = "L"
cMemVar := ' '
FREAD(nHandle, @cMemVar, 1)
xMemVar := (cMemVar = "T")
CASE cValType = "N"
cMemVar := SPACE(nLen)
FREAD(nHandle, @cMemVar, nLen)
xMemVar = VAL(cMemVar)
ENDCASE
nErrorCode := FERROR()
ENDIF
RETURN xMemVar