Microsoft KB Archive/107405

{| = BUG: _DBReplace in LCK Leaks Memory =
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ID: Q107405

The information in this article applies to:


 * Microsoft FoxPro for Windows, versions 2.5x, 2.6x
 * Microsoft FoxPro for MS-DOS, versions 2.6x

SYMPTOMS
In the FoxPro Library Construction Kit, if you use the _DBReplace function to replace information into a character field in a database, memory will slowly be lost.

STATUS
Microsoft has confirmed this to be a problem in the Microsoft products listed at the beginning of this article.

Steps to Reproduce Problem
The following code can be used to reproduce the problem. The SYS(1016) value will change approximately every 200-400 calls to the library. It will change by values around 2 kilobytes each time. There is currently no known workaround.

* FoxPro Code CLOSE ALL CLEAR ALL x = "a" CREATE TABLE lcktest (tstfield c(25)) APPEND BLANK SET LIBRARY TO test.dll FOR i=1 TO 10000 ?SYS(1016),i =myplbfunc(REPLICATE( X ,10)) ENDFOR

// LCK 'C' Code test.c  #include    void FAR Generic(ParamBlk FAR *parm) {  Value myval; Locator DbfFldLoc;

// Locate field named 'tstfield'

if ((DbfFldLoc.l_NTI = _NameTableIndex("tstfield")) == -1) _UserError("Failed at _NameTableIndex call.");

// Find the field in the database, and store location to Locator // structure

if (_FindVar(DbfFldLoc.l_NTI, 1, &DbfFldLoc) == 0) _UserError("Failed at _FindVar call.");

// Replace character field with information from passed in variable

_DBReplace(&DbfFldLoc,&parm->p[0].val);

}

FoxInfo myFoxInfo[] = { {"MYPLBFUNC", (FPFI) Generic, 1, "C"}, };

FoxTable _FoxTable = { (FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo }; Additional reference words: FoxWin FoxDos 2.50 2.50a 2.50b 2.60 2.60a buglist2.50 buglist2.50a buglist2.50b buglist2.60 buglist2.60a LCK API KBCategory: kbtool kbenv kbbuglist KBSubcategory: FxtoolLck
 * }