ListBox Limitations

[needaname16]

Hi,

I have a ListBox control that I want to fill with a maximum of 37767 records, I also want to enable Multiple select with the ability to select all the records.

My question is what are the limitations of the ListBox in VB6 (ie how many records can it take and how many records can be selected at one time with multiple select).

Thanks
Needaname16

[BuggyProgrammer]

a listbox can hold up to the length of an integer (or if someone else answers they can tell you unsigned or signed i dunno)

i think the listview can go higher so use that instead.

[BuggyProgrammer]

36276 i think is how much records it can hold, maybe 2 numbers changed around

[Arc]

Yes it is maxed out at 32,735 or something like that. if you want to go higher then that then you need my Listbox.OCX. The only listbox(3rd Party or otherwise) i know of that can handle 2Million+ items.

Download it Here

Or Click the Link in my sig to read what all else it can do

[needaname16]

Thanks for the replies.

Needaname16.

[JeffSM]

Use ListView, it's easy and more flexible and supports 2bilions lines (teory). You can use .MultiSelect, FullRowSelect, etc.

Jefferson Motta

[needaname16]

Thanks for the Replies,

I have just looked into the ListView and are currently using it to get past my problem I just have a couple of questions:

1) I could not find fullrowselect property in the Listview properties how do I get to this property?

2) I notice with a lot of items in the ListView it takes a while for the form to unload. Is there a way I can use my status display to tell the user the progress of unloading the form?

3) How can I put a combo box in a coloumn to allow the user to select an option for a particular record?

Thanks for the Help

Needaname16

[needaname16]

Surely someone knows how to do these things, I really need an answer to the 4th question (How do I put a combo box in one of the coloumns in the ListView?)

Any Help is greatly appreciated.

Needaname16

[JeffSM]

'
'You can Find an sample how edit text with ListView.
'Change Text with ComboBox: lvsubitemedit.zip
'

'
'Show in form status the unloading and use
'LVWDeleteAllItems(ListView1.hWnd) to delete quickly using API
'

Private Const LVS_EX_FULLROWSELECT As Long = &H20

Private Const LVM_FIRST As Long = &H1000
Private Const LVM_SETEXTENDEDLISTVIEWSTYLE As Long = LVM_FIRST + 54
Private Const LVM_GETEXTENDEDLISTVIEWSTYLE As Long = LVM_FIRST + 55
Private Const LVM_DELETEALLITEMS As Long = (LVM_FIRST + 9)

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

'
'FullRowSelect you can find in MSComCtl.ocx or via API
'It'll be available with View = lvwReport
'

Public Sub LVWFullRowSelect(ByVal hwnd As Long)

On Error Resume Next

Dim nLwRet As Long
Dim nStyle As Long

nStyle = SendMessage(hwnd, LVM_GETEXTENDEDLISTVIEWSTYLE, 0&, ByVal 0&)
nStyle = nStyle Or LVS_EX_FULLROWSELECT
nLwRet = SendMessage(hwnd, LVM_SETEXTENDEDLISTVIEWSTYLE, 0&, ByVal nStyle)

End Sub


'Delete ALL ITENS via API

Public Function LVWDeleteAllItems(ByVal hwnd As Long)
SendMessage hwnd, LVM_DELETEALLITEMS, 0, 0
End Function


Good Luck!

Jefferson Motta

[darre1]

just a tip:

when typing code into a post please use "vbcode" tag at the start of the code and the "/vbcode" at the end of the code.

it makes it much more readable. (and indents)

ta.

[The Hobo]

Originally posted by needaname16
1) I could not find fullrowselect property in the Listview properties how do I get to this property?

2) I notice with a lot of items in the ListView it takes a while for the form to unload. Is there a way I can use my status display to tell the user the progress of unloading the form?

3) How can I put a combo box in a coloumn to allow the user to select an option for a particular record?

1) Right click on the control and open the properties. It should be in a check box on the right side of the dialog. If not, check your version of MS Windows Common Controls.

2) I think this was already answered?

3) Search http://www.planet-source-code.com/ or these forums. They both have pretty good examples of adding controls to the ListView.