Shoutbox

It's much better to use the Win32 control messages for this, as if you make a mistake in your while-loop, you'll end up in an endless loop of doom and thus crashing your Messenger.

For list boxes:

code:

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PlusWnd.SendControlMessage("ListBox", /* LB_RESETCONTENT */ 0x184, 0, 0);

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For list views:

code:

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PlusWnd.SendControlMessage("ListView", /* LVM_DELETEALLITEMS */ 0x1009, 0, 0);

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The worst thing you can get then is a "bad calling convention" or something in your Interop.GetLastError().

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Blah, you already solved it yourself. Anyway, this post is for future generations.