TAdvCheckedTreeView assign

VCL TMS VCL UI Pack
1

Hello
I am using TAdvCheckedTreeview and am editing nodes. So the user can cancel changes to the node, i would like to store a copy of the node in another node where ANode is the original and copyNode is the edit.

copyNode.Assign(ANode)
...do things here with copy node.
copyNode....

if I try to assign ANode to copyNode again, I get an exception exception class $C0000000005 with message 'C0000000005 ACCESS_VIOLATION'

is there a way to reset the copyNode like free and reinitialize it? is there a better way to accomplish the Assign?

thanks
Doug


2

Hi, 


Can you perhaps provide the source code that handles this so we can investigate what exactly is missing?
3

Thanks

With some help from suport (Pieter) I believe I was not initializing Node variables correctly, however with the suggested solution, I get the same error on the initialization of the variable localNode:

procedure EditNode(ANode: TAdvCheckedTreeViewNode);

var

  localNode: TAdvCheckedTreeViewNode;

begin

localNode := TAdvCheckedTreeViewNode.Create(nil);  ///$$$$$$ ERROR!

localNode.Assign(ANode);

//make changes or cancel changes to localNode

ANode.Assign(localNode);

localNode.Free;

end;

Any suggestions? If I comment out the localNode.Create(nil), the localNode.Free does not error.


thnx


4

We have further investigated this here and there are some missing Assign checks in the treeview source that prevents the use of a nil parameter passed to the constructor of a TAdvCheckedTreeViewNode. We have applied fixes that will be available in the next release and will allow to create a node with a nil parameter. For urgent fixes, please contact us by direct email