Calling managed functions from unmanaged code

2 Comments

• God Bless You, dude!!!
  
  Keep the right direction :-)
  

• Is there any way you can post a small trivial example of the first Q&A post? We are currently having problems with some (strangely not all though) delegate callbacks when we mix managed/unmanaged code. This is how we have been doing it in sorta-psuedo-code.
  
  
  
  Say our managed Forms app has a function
  
  
  
  private void AddListViewItem(ListViewItem * lvi)
  
  {
  
  ...
  
  }
  
  
  
  and we declare/create a delegate...
  
  
  
  public __delegate void AddDelegate(ListViewItem * lvi);
  
  AddDelegate * myAD;
  
  myAD = new AddDelegate(this,AddListViewItem);
  
  
  
  Now we can pass a pointer to this class to our unmanaged classes using the <gcroot> mechanism, and then call the delegate.
  
  
  
  Object * [] o = {listViewItem1};
  
  _parent->Invoke(_parent->myAD,o);
  
  
  
  
  
  
  
  This works flawlessly in some cases, calling back in on the correct thread etc., but in other cases we get constant exceptions of the "The Application has requested that the runtime terminate it in an unusual way...". Is there something obviously wrong with this? MSDN suggests this as the only way to insure thread safety (and prevent crashes other weird behavior) with Forms controls.
  
  
  
  Thanks,
  
  
  
  Paul M. Seabury