I am trying to assign two pointers to the same character in two different
strings. If I assign the pointers once, they seem to work. If I attempt to
reassign the pointers to another location in the same character strings, I get
an error. One of the strings is a char * passed to the function. The other is
a pointer to a record structure.
The error is (in abbreviated terms):
"wrote to memory location in the stoarge heap. Use special functions calls to
access this area."
The problem seems to be caused if I assign the char pointers "try1" and "try2"
to another location in the same strings. It doesn't happen with the first
assignment.
The code that causes the problem looks like:
Err ClosestSort(Char* Text, DmOpenRef dbase)
{
int i,j,MinLength,matchnum=0, Test;
TransStruct* Record = (TransStruct *) MemPtrNew(sizeof(TransStruct));
char* try1;
char* try2,try3;
char tryit;
Err err = 0;
MemHandle h;
for(i = 0;i<DmNumRecords(dbase);i++)
{
h = DmGetRecord(dbase, i);
if (h)
{
// could fail due to out of memory! check to see if you've got
the handle
TransStructType * p = (TransStructType *) MemHandleLock(h);
//preceding line associated the transstruct structure with the
//memory chunk associated with the record that has been
associated
//with a handle
if (StrLen(Text) < StrLen(p->TrName))
{
MinLength = StrLen(Text);
}
else
{
MinLength = StrLen(p->TrName);
}
if (MinLength>0)
{
*try1=p->TrName[0];
*try2=Text[0];
Test= TxtCaselessCompare (try1,1, NULL, try2,1, NULL);
}
//PROBLEM OCCURS IF I ADD THE FOLLOWING "IF" STATEMENT:
if (MinLength>1)
{
*try1=p->TrName[0];
*try2=Text[0];
Test= TxtCaselessCompare (try1,1, NULL, try2,1, NULL);
}
matchnum = Test;
Record->DegreeMatch=matchnum;
err = DmWrite(p, OffsetOf(TransStructType,
DegreeMatch),&Record->DegreeMatch, sizeof(Record->DegreeMatch));
MemPtrUnlock(p);
DmReleaseRecord(dbase, i, true);
matchnum=0;
}
}
return err;
}
Thanks for any assistance with this.
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