CRASH using Sendmessage API to Combobox

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   Sendmessage API crashes the combox when accessing the ItemData property after filling in the itemdata property using Sendmessage method.

'Add a string to the combox
ItemIndex = SendMessage(Hwnd, CB_ADDSTRING, 0, ByVal Item)

'Add a value to the ItemData property
ret = SendMessage(Hwnd, CB_SETITEMDATA, ItemIndex, ByVal ItemData)

When I fill in the ITEMS combox using Sendmessage it works ok.
When I fill in the ITEMDATA using Sendmessage it works ok.
When I try to access the ItemData property, 
eg. Debug.Print Combox.ItemData(0)
it crashes with a message 'Object has disconnected from client...'

If I fill in the ItemData without the Sendmessage API there is no crash.
(Even if I have filled the Items using Sendmessage)

The reason for using the Sendmessage API method is to speed up the loading of large lists.

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Stilki Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 27 May 2005 Status: Offline Points: 70	Post Options Post Reply Quote Stilki Report Post Thanks(0) Quote Reply Topic: CRASH using Sendmessage API to Combobox Posted: 24 June 2008 at 11:47pm
	Sendmessage API crashes the combox when accessing the ItemData property after filling in the itemdata property using Sendmessage method. 'Add a string to the combox ItemIndex = SendMessage(Hwnd, CB_ADDSTRING, 0, ByVal Item) 'Add a value to the ItemData property ret = SendMessage(Hwnd, CB_SETITEMDATA, ItemIndex, ByVal ItemData) When I fill in the ITEMS combox using Sendmessage it works ok. When I fill in the ITEMDATA using Sendmessage it works ok. When I try to access the ItemData property, eg. Debug.Print Combox.ItemData(0) it crashes with a message 'Object has disconnected from client...' If I fill in the ItemData without the Sendmessage API there is no crash. (Even if I have filled the Items using Sendmessage) The reason for using the Sendmessage API method is to speed up the loading of large lists.

Oleg Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 21 May 2003 Location: United States Status: Offline Points: 11234	Post Options Post Reply Quote Oleg Report Post Thanks(0) Quote Reply Posted: 25 June 2008 at 12:38am
	Hi, Don't use API. Combo use own structures in ItemData.
	Oleg, Support Team CODEJOCK SOFTWARE SOLUTIONS