ASSERT failure in QList<T>::operator[]: "index out of range", file

[iswaryasenthilkumar]

am using QString list to get list of files from one folder and copying these files in another folder.my files are copied bt i geting error as
ASSERT failure in QList<T>:perator[]: "index out of range", file.
i couldnt move to next step
can any one give me suggestion for this
Thanks in Advance

[alainstgt]

you are trying to read data ot of bounds.

Compare the size of your list ( myList.size() ) with the argument passed to operator[]

Alain

[Radek]

Just guessing: Note that operator [ ] ( int i ) can reference only list items already added to the list but it cannot add items to the list. To build the list, use append(). For example:

QList<MyItem> mylist;       // mylist has now size 0
 
for( int i = 0; i < 5; i++ )
{
  mylist[i] = something;    // fail! The list has size 0 still. No items added on the list.
}

QList<MyItem> mylist;       // mylist has now size 0

for( int i = 0; i < 5; i++ )
{
  mylist[i] = something;    // fail! The list has size 0 still. No items added on the list.
}

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You must append first:

QList<MyItem> mylist;       // mylist has now size 0
 
for( int i = 0; i < 5; i++ )
{
  mylist.append(something); // ok. mylist size = 5 at the end of the cycle. Now, it is ok to use mylist[i] for i = 0,1, ..., 4
}

QList<MyItem> mylist;       // mylist has now size 0

for( int i = 0; i < 5; i++ )
{
  mylist.append(something); // ok. mylist size = 5 at the end of the cycle. Now, it is ok to use mylist[i] for i = 0,1, ..., 4
}

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