Access violations

[packetlos]

Hi, I am calling the following bit of code from a worker thread via SendMessage to update the user interface in the view:

LRESULT CNetworkMonitoringListView::OnThreadUpdate(WPARAM wParam, LPARAM lParam)
{
CString sResult;
LV_ITEM lvi;

lvi.mask = LVIF_TEXT | LVIF_DI_SETITEM;	// instance mask
lvi.iItem = (INT)lParam;		// position in control
lvi.iSubItem = 0;			// column
lvi.pszText = (LPTSTR)(LPCTSTR)lParam;	// 
GetListCtrl().InsertItem(&lvi);		// insert the item

for (int i = 0; i < 5; i++)
{
	lvi.iSubItem = i;
	GetDocument()->m_cs.Lock();
	// get the text for the relevant row subitem
	sResult = GetDocument()->m_capturedPacket.GetDescription((UINT)lParam, i);
	GetDocument()->m_cs.Unlock();
	lvi.pszText = (LPTSTR)(LPCTSTR)(sResult);
	GetListCtrl().SetItem(&lvi);
		
	}

return 0;
}

The second time the message from the worker thread is processed

GetListCtrl().InsertItem(&lvi)

causes an access violation and fails to add another entry into the CListview, is there anything I can do? :(( Cheers Packetlos

[David Crow]

packetlos wrote: I am calling the following bit of code from a worker thread via SendMessage to update the user interface in the view: Use PostMessage() instead. Read this article.

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

[packetlos]

Cheers for the link, i have read the article and I am doing what it suggests by using a user defined message to trigger OnThreadUpdate now using PostMessage() and it is still causing access violations. Any other things I should be looking at anybody? Thanks

[Neville Franks]

The VC Debugger will point you towards the location of the access violation, which should help you to fix the cause. Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com