I was having this NULL handle error. I managed to track the error down to
this function
void RestoreScreenStringValue(int ItemId, Char *StringValue )
{
FieldPtr ItemPtr = (FieldPtr)GetObjectPtr(ItemId);
Handle stringH;
CharPtr stringP;
stringH = MemHandleNew(81);
stringP = MemHandleLock(stringH);
StrCopy( stringP, StringValue );
FldSetTextHandle (ItemPtr,stringH);
FldDrawField(ItemPtr);
MemHandleUnlock( stringH );
}
It wass screwing up whenever the StringValue parameter wass not pointing to
anything and therefore it is trying to set a handle which is NULL. Dunno if
this will help you but that is the kind of thing which can cause this error.
-----Original Message-----
From: Herman Badenhorst [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, February 21, 2001 7:53 AM
To: Palm Developer Forum
Subject: "MemoryMgr.c, Line:4340, NULL handle"
I'm also getting the "MemoryMgr.c, Line:4340, NULL handle" error...and I've
found the place where the error occured...but i really dont see anything
wrong?
can you clever guys please point out the "errors" in the next peace of
code...
I need to find the error since i have to deliver the program on monday...
Many Thanks In Advance!
Herman
//-------------------------------------------------------------------
static Boolean FrmSelectVoucherFormHandleEvent(EventPtr event)
{
Boolean handled = false;
int i,j,x,y;
static FormPtr frm;
static FormPtr *frmNew;
static ControlPtr ctl;
Boolean vFound = false;
Boolean blnPrevious = false;
Boolean blnNext = false;
_VoucherRecord vVoucherRecord;
_DynamicVouchers_Value vDynamicVoucherRecord;
_DynamicVouchers_Value_ID vRecordTypeID;
static char vVoucher[MAX_VS+MAX_VA+MAX_VSDT+MAX_PIN+1]; //represents
VoucherDB
static char vVoucherTypeQty[MAX_VA+MAX_QTYL+MAX_QTYS+1]; //represents
VoucherTypeDB
static char vNewRecord[MAX_VA+MAX_QTYL+MAX_QTYS+1]; //represents
VoucherTypeDB
static char vNewRecord1[MAX_VA+MAX_QTYL+MAX_QTYS+1];
static char vVoucherTypeID[MAX_VA+MAX_SUP_ID+1];
static char vNewRecordID[MAX_VA+MAX_SUP_ID+1];
static char TempQty[MAX_QTYL];
static char vVoucherValue[MAX_VA];
int vTotal; //total tock
on hand integer value
static int vButtonCount;
static int VoucherQtyL = 0; //quantities
per voucher (
static int vcount;
EventType newEvent;
char vStrTotalSold[10]; //total
stock on hand string value
switch (event->eType) {
case ctlSelectEvent: // A control button was pressed and released.
if (event->data.ctlEnter.controlID == frmSelectVoucherCmdReturnButton)
{
FrmGotoForm(FrmPilotForm);
vRecordCount = 0;
handled = true;
break;
}
else if (event->data.ctlEnter.controlID == 5750) {
//Next
FrmGotoForm(FrmSelectVoucherForm);
handled = true;
break;
}
else if (event->data.ctlEnter.controlID == 5751) {
//Previous
FrmGotoForm(FrmSelectVoucherForm);
vRecordCount = vRecordCount - vButtonCount - 8;
handled = true;
break;
}
else {
for (i=0;i<DmNumRecords(DynamicTypeIDDB);i++) {
ReadRecord(DynamicTypeIDDB,vVoucherTypeID,i);
if (StrLen(vVoucherTypeID) != MAX_VA+MAX_SUP_ID)
continue;
StrNCopy(vRecordTypeID.dVoucherValue,vVoucherTypeID,MAX_VA);
//get the supplier
vRecordTypeID.dVoucherValue[MAX_VA] = 0;
StrNCopy(vRecordTypeID.dVoucherID,vVoucherTypeID+MAX_VA,MAX_SUP_ID);
//get the supplier
vRecordTypeID.dVoucherID[MAX_SUP_ID] = 0;
if (event->data.ctlEnter.controlID ==
StrAToI(trim(vRecordTypeID.dVoucherID))) {
StrCopy(gVoucherSelectedtoSellFormOrigin,trim(vRecordTypeID.dVoucherValue));
FrmGotoForm(FrmFirstSaleConfirmationForm);
handled = true;
break;
}
}
}
break;
case frmOpenEvent:
// Determine amount of vouchers left for each type
vTotal = 0;
for (j=0;j<DmNumRecords(DynamicTypeDB);j++) { //read all
the different suppliers from DynamicSupplierDB
VoucherQtyL = 0;
ReadRecord(DynamicTypeDB,vVoucherTypeQty,j);
if (StrLen(vVoucherTypeQty) != MAX_VA+MAX_QTYL+MAX_QTYS)
continue;
StrNCopy(vDynamicVoucherRecord.dVoucherValue,vVoucherTypeQty,MAX_VA);
vDynamicVoucherRecord.dVoucherValue[MAX_VA] = 0;
for (i=0;i<DmNumRecords(VoucherDB);i++) {
ReadRecord(VoucherDB,vVoucher,i);
if (StrLen(vVoucher) != MAX_VS+MAX_VA+MAX_VSDT+MAX_PIN+MAX_SLD)
continue;
StrNCopy(vVoucherRecord.Voucher_Type,vVoucher,MAX_VS);
vVoucherRecord.Voucher_Type[MAX_VS] = 0;
trim(vVoucherRecord.Voucher_Type);
StrNCopy(vVoucherRecord.Voucher_Amount,vVoucher+MAX_VS,MAX_VA);
vVoucherRecord.Voucher_Amount[MAX_VA] = 0;
StrNCopy(vVoucherRecord.Voucher_Sold,vVoucher+MAX_VS+MAX_VA+MAX_VSDT+MAX_PIN
,MAX_SLD);
vVoucherRecord.Voucher_Sold[MAX_SLD] = 0;
trim(vVoucherRecord.Voucher_Sold);
if
(StrCaselessCompare(vVoucherRecord.Voucher_Type,gSupplierFormOrigin) == 0)
if (StrCaselessCompare(vVoucherRecord.Voucher_Sold,NOT_SOLD) ==
0)
if
(StrCaselessCompare(vVoucherRecord.Voucher_Amount,vDynamicVoucherRecord.dVou
cherValue) == 0) {
VoucherQtyL++;
//handled = true;
}
} //for i
// update the DynamicTypeDB so that the voucher qty info is added
StrCopy(vNewRecord,vDynamicVoucherRecord.dVoucherValue);
//Amount/Type
StrIToA(TempQty,VoucherQtyL);
//convert int to str
StrPrintF(vNewRecord1,"%s%*d",vNewRecord,MAX_QTYL,VoucherQtyL);
//add qty 4 characters wide to end of vNewRecord
StrCat(vNewRecord1," ");
//MAX_QTYS
EditRecord(DynamicTypeDB,vNewRecord1,j);
//update the DynamicTypeDB with Voucher qty
vTotal = vTotal + VoucherQtyL;
//count all the qty's together
} //for j
frm = FrmGetFormPtr (FrmSelectVoucherForm);
//get a pointer to the selectvoucher form
frmNew = &frm;
//get a pointer to the form pointer
//clear the DynamicTypeID database
while (DmNumRecords(DynamicTypeIDDB) > 0)
DmRemoveRecord(DynamicTypeIDDB,0);
//get range to display vouchers "from" and "to"
//vRecordCount = current record out of the total number of records
//vcount = how many records depending on vRecordCount to display
blnPrevious = false;
blnNext = false;
if (DmNumRecords(DynamicTypeDB) < 8)
//less than 8 vouchers to display
vcount = DmNumRecords(DynamicTypeDB);
else {
if ((vRecordCount+8) > DmNumRecords(DynamicTypeDB)) { //display
only calculated qty of voucher buttons
vcount = (DmNumRecords(DynamicTypeDB) - 8) + vRecordCount;
blnNext = true;
}
else {
//display 8 vouchers buttons
vcount = vRecordCount+8;
if (vcount != 8)
//dont diplsy << on first screen
blnPrevious = true;
blnNext = true;
}
}
if (blnNext) {
CharPtr vTmp1 = (CharPtr)">>";
ctl = CtlNewControl (frmNew, 5750, buttonCtl, vTmp1, 24, 140, 18,
15, FntGlueGetDefaultFontID (defaultBoldFont), 8500, false);
}
if (blnPrevious) {
CharPtr vTmp2 = (CharPtr)"<<";
ctl = CtlNewControl (frmNew, 5751, buttonCtl, vTmp2, 3, 140, 18, 15,
FntGlueGetDefaultFontID (defaultBoldFont), 8501, false);
}
vButtonCount = 0; //number of buttons on the current form
for (i=vRecordCount;i<vcount;i++) { //read all the
different suppliers from DynamicSupplierDB
ReadRecord(DynamicTypeDB,vVoucherTypeQty,i);
if (StrLen(vVoucherTypeQty) != MAX_VA+MAX_QTYL+MAX_QTYS)
continue;
StrNCopy(vDynamicVoucherRecord.dVoucherValue,vVoucherTypeQty,MAX_VA);
//get the amount
vDynamicVoucherRecord.dVoucherValue[MAX_VA] = 0;
StrCopy(vVoucherValue,vDynamicVoucherRecord.dVoucherValue);
trim(vDynamicVoucherRecord.dVoucherValue);
StrNCopy(vDynamicVoucherRecord.dVoucherQuantityLeft,vVoucherTypeQty+MAX_VA,M
AX_QTYL); //get the qty
vDynamicVoucherRecord.dVoucherQuantityLeft[MAX_QTYL] = 0;
trim(vDynamicVoucherRecord.dVoucherQuantityLeft);
//add qty next to amount on button eg. V29R (3)
StrCat(vDynamicVoucherRecord.dVoucherValue," (");
StrCat(vDynamicVoucherRecord.dVoucherValue,vDynamicVoucherRecord.dVoucherQua
ntityLeft);
StrCat(vDynamicVoucherRecord.dVoucherValue,")");
//Add the voucher amount/type and id to DynamicTypeIDDB
StrPrintF(vNewRecordID,"%s%*d",vVoucherValue,MAX_SUP_ID,5500+vButtonCount);
AddRecord(DynamicTypeIDDB,vNewRecordID);
CharPtr vTmp = (CharPtr)vDynamicVoucherRecord.dVoucherValue;
//pointer to amount/qty string
switch (vButtonCount) {
case 0:
x = 6;
y = 17;
break;
case 1:
x = 84;
y = 17;
break;
case 2:
x = 6;
y = 47;
break;
case 3:
x = 84;
y = 47;
break;
case 4:
x = 6;
y = 77;
break;
case 5:
x = 84;
y = 77;
break;
case 6:
x = 6;
y = 107;
break;
case 7:
x = 84;
y = 107;
break;
default:
break;
}
ctl = CtlNewControl (frmNew, (5500+vButtonCount), buttonCtl, vTmp,
x, y, 70, 25, FntGlueGetDefaultFontID (defaultBoldFont), 8000+i, false);
vRecordCount++;
vButtonCount++;
} //for
FrmDrawForm (FrmGetActiveForm());
//display the total stock on hand
FieldType *fld =
(FieldPtr)GetObjectPtr(frmSelectVoucherTxtTotalStockOnHandField);
FldSetTextPtr(fld,StrIToA(vStrTotalSold,vTotal));
FldRecalculateField(fld,true);
FldDrawField(fld);
handled = true;
break;
}
return(handled);
}
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