I have been trying hard to find how to get access to the object I stored in a
QMultiMap container. I am able to retrieve the numbered keys but when I try
accessing the object QGIS crashes.
I have done similar work in plain C++ and it has worked with out any problem, I
used regualr multimap before. Here I tried both QT multimap and regualr
multimap and while trying to access the second item in the iterator QGIS seems
to give up. Any help will be appreciated. I have pasted a piece of the code
below,
typedef QMultiMap<long,QgsPoint> mmaplngQPt;
// QgsPoint map iterator objects
typedef mmaplngQPt::iterator maplngQPtit1, maplngQPtit2;
mmaplngQPt::iterator Pt1Qmapit, Pt2Qmapit,itQlow, itQup;
typedef pair < long, QgsPoint > QPt_pair;
mmaplngPt mapQPt,mapQPt0,mapQPt1;
mmaplngPt::iterator mapQPtit;
long iKey;
int lbx,ubx;
QgsPoint vx;
itQlow=mapQPt.lowerBound (lbX);
itQup=mapQPt.upperBound (ubX);
for ( mapQPtit=itQlow ; mapQPtit != itQup; mapQPtit++ )
{
txtStream <<"key = "<<itQlow.key()<<endl;
iKey =
(QPt1mapit).key();
vx = (QPt1mapit).value();
}
The program crashes write after it prints the key value. By the way any way of
finding a meaningful error message in QGIS?
Thank you,
Maaza
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