I’m working on a C# plugin and use NPPM_CREATESCINTILLAHANDLE to get a Scintilla instance.

It all works as expected, and as directed on the wiki Messages And Notifications page I call NPPM_DESTROYSCINTILLAHANDLE when I am done.

Thereafter NPP appears to work correctly, but soon crashes with an Access Violation when doing ScintillaEditView::attachDefaultDoc()… well away from my plugin which is by now dormant. If I skip the DESTROY call, the crash does not occur.

So is NPPM_DESTROYSCINTILLAHANDLE only intended to be called on Notepad++ shutdown?
Or is there some other action I need to take first?

NB: This is running NPP and my plugin through VS2017 IDE debugger, and is currently using NPP v7.4.2 source (slightly modified)… so please just after general advice on the create/destroy handle thing before trying to isolate the error further.

Specifically the crash happens on the “isVisibile” line here:

size_t FileManager::nextUntitledNewNumber() const
{
  std::vector<size_t> usedNumbers;
  for(size_t i = 0; i < _buffers.size(); i++)
  {
	Buffer *buf = _buffers.at(i);
	if (buf->isUntitled())
	{
		// if untitled document is invisible, then don't put its number into array (so its number is available to be used)
		if ((buf->_referees[0])->isVisible())
                   ...

Cheers,
Moon