I am drawing a list from the database. My app stops
with "unallocated chunk of memory" error on the
following "WinDrawChars" statement:
static void MainFormListDrawItem(Int16 itemNum,
RectangleType *bounds, Char **unused) {
MemHandle recHandle;
FDBRecordType *recF;
/******* itemnum is always 0 here.
Is this where the problem is? ***********/
recHandle = DmQueryRecord(gF, itemNum);
recF = MemHandleLock(recHandle);
/****** this line doesn't work. ********/
WinDrawChars(recF->fname,StrLen(recF->fname),
bounds->topLeft.x, bounds->topLeft.y);
MemHandleUnlock(recHandle);
}
Here is the Stucture for the database record:
typedef struct {
UInt16 fid;
char *fname;
}FDBRecordType;
Here is my init function (this function works)
static void MainFormInit(FormPtr /*frmP*/){
FormPtr frm;
ListPtr lst;
UInt16 numRecords;
/* get a pointer to the main form */
frm = FrmGetActiveForm();
/* get the number of records in the database */
/* it retuns me 100 recs */
numRecords = DmNumRecords(gF);
if (numRecords) {
/* get a pointer to the list object */
lst = FrmGetObjectPtr(frm,
FrmGetObjectIndex(frm,MainLstFList));
/* set the number of list choices */
LstSetListChoices(lst, NULL, numRecords);
/* set the callback function to draw the list */
LstSetDrawFunction(lst, MainFormListDrawItem);
}
}
Could anymore give me some pointers. Thanks.
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