Try this:
FrmCustomAlert(ErrorAlert2,*temp, " ", " ");
instead of
FrmCustomAlert(ErrorAlert2, *temp, "", "");
Anthony Randazzo
Unwired Express - wireless that works for you
9101 Guilford Road
Columbia, MD 21046
301 498 3003 x3761
301 498 6003 Fax
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-----Original Message-----
From: Sara Revell [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 21, 2001 11:36 AM
To: Palm Developer Forum
Subject: Database Help!
Hello,
I am having difficulties searching my database. What I am trying to do
is
to read in co-ordinates from a GPS and compare them with co-ordinates in
a
databases.
Currently, all I am trying to do is get the X co-ordinate out of the
database (so that I can then convert it to an Integer and compare to my
co-ordinate) - right now, it should be a string.
My code compiles, but when it gets to the line
FrmCustomAlert(ErrorAlert2,
*temp, "", "");, it throws a memory error in POSE, saying that it is
accessing a memory location in low memory. I have tried various
incarnations of the code below, and it has been looked at by someone
much
more proficient in C, than I am! :)
Snippets of revelant code are below.
Any help would be greatly appreciated!
Sara
// Structure of the Database
typedef struct {
Int32 mapID;
const char *Xul;
const char *Yul;
const char *Xlr;
const char *Ylr;
const char *Bitmap;
} Map;
/***********************************************************************
* FUNCTION: InitializeMap
* DESCRIPTION: Initializes the map database with sample co-ordinates
* PARAMETERS: none
* RETURNED: none
* REVISION HISTORY:
***********************************************************************/
static void InitializeMap(void)
{
Map m1 = {1, "N55:56:59", "W3:12:21",
"N55:56:50", "W3:11:36", "BitmapTest1"};
Map m2 = {2, "N55:57:06", "W3:11:38",
"N55:56:53", "W3:11:08", "BitmapTest2"};
Map *map[2];
UInt16 numMap = sizeof(map) / sizeof(map[0]);
UInt16 i;
MemHandle newRecordH;
Map *newRecordP;
map[0] = &m1;
map[1] = &m2;
for (i = 0; i < numMap; i++) {
UInt16 index = dmMaxRecordIndex;
newRecordH = DmNewRecord(gLibDB, &index,
sizeof(map[i]));
newRecordP = MemHandleLock(newRecordH);
DmWrite(newRecordP, 0, &map[i], sizeof(map[i]));
MemHandleUnlock(newRecordH);
DmReleaseRecord(gLibDB, index, true);
}
}
/***********************************************************************
* FUNCTION: SearchDB
* DESCRIPTION: Searches the DB for and compares the co-ordinates
* PARAMETERS: db: the database to be searched
* RETURNED: boolean
* REVISION HISTORY: 11/06/01: created
* 13/06/01: added loop
***********************************************************************/
static Boolean SearchDB(DmOpenRef db)
{
UInt16 numRecords;
Int16 index;
MemHandle h = NULL;
Map *mapPointer, map;
char *temp = NULL;
FormPtr frm = FrmGetActiveForm();
// If there are no records in the database, return false.
numRecords = DmNumRecords(db);
if (numRecords == 0){
FrmAlert(ErrorAlert);
return false;
}
for (index = 0; index < numRecords; index++){
h = DmQueryRecord(db, index);
mapPointer = MemHandleLock(h);
map = *mapPointer;
temp = (char *) map.Xul;
FrmCustomAlert(ErrorAlert2, *temp, "", "");
MemHandleUnlock(h);
DmReleaseRecord(db, index, true);
}
return true;
}
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