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Thread: is it possible to know when clipboard changes?

  1. Oct 31st, 2003, 03:25 AM #1
    MrPolite
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    is it possible to know when clipboard changes?

    with .NET or with APIs?
    any way to raise an event when the data in clipboard is changed?
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  2. Oct 31st, 2003, 04:56 AM #2
    Merrion
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    Doesn't the clipboard chain component do this?

    If not you could coinvert this VB6 code which uses APIs...
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  3. Oct 31st, 2003, 09:31 AM #3
    dynamic_sysop
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    if you want a basic example to start with, i knocked this up for you, it notifies you when the clipboard receives a change, you can add stuff like if it receives copy etc... as you like
    VB Code:
    1. [Color=Blue]Private[/COLOR] [Color=Blue]Declare[/COLOR] [Color=Blue]Function[/COLOR] SetClipboardViewer [Color=Blue]Lib[/COLOR] "user32" ([Color=Blue]ByVal[/COLOR] hwnd [Color=Blue]As[/COLOR] IntPtr) [Color=Blue]As[/COLOR] [Color=Blue]Integer

    2. [/COLOR]    [Color=Blue]Private[/COLOR] [Color=Blue]Const[/COLOR] WM_DRAWCLIPBOARD = &H308

    3.     [Color=Blue]Private[/COLOR] IsSubClassed [Color=Blue]As[/COLOR] [Color=Blue]Boolean[/COLOR] = [Color=Blue]False

    4.  
    5. [/COLOR]    [Color=Blue]Private[/COLOR] [Color=Blue]Sub[/COLOR] Form1_Load([Color=Blue]ByVal[/COLOR] sender [Color=Blue]As[/COLOR] System.Object, [Color=Blue]ByVal[/COLOR] e [Color=Blue]As[/COLOR] System.EventArgs) [Color=Blue]Handles[/COLOR] [Color=Blue]MyBase[/COLOR].Load

    6.         SetClipboardViewer([Color=Blue]Me[/COLOR].Handle)

    7.         IsSubClassed = [Color=Blue]True

    8. [/COLOR]    [Color=Blue]End[/COLOR] [Color=Blue]Sub

    9.  
    10. [/COLOR]    [Color=Blue]Protected[/COLOR] [Color=Blue]Overrides[/COLOR] [Color=Blue]Sub[/COLOR] WndProc([Color=Blue]ByRef[/COLOR] m [Color=Blue]As[/COLOR] System.Windows.Forms.Message)

    11.         [Color=Blue]If[/COLOR] IsSubClassed [Color=Blue]Then

    12. [/COLOR]            [Color=Blue]If[/COLOR] m.Msg = WM_DRAWCLIPBOARD [Color=Blue]Then

    13. [/COLOR]                MessageBox.Show("ClipBoard has been modified!")

    14.             [Color=Blue]End[/COLOR] [Color=Blue]If

    15. [/COLOR]        [Color=Blue]End[/COLOR] [Color=Blue]If

    16. [/COLOR]        [Color=Blue]MyBase[/COLOR].WndProc(m)

    17.     [Color=Blue]End[/COLOR] [Color=Blue]Sub[/COLOR]
    ~
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  4. Oct 31st, 2003, 05:17 PM #4
    MrPolite
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    aha, thanks to both of you...
    just wondering though, doesnt this slow the program down a lot? cuz each time WndProc is fired it has to check if it was from the clipboard or not... and I guess WndProc is fired a billion times when you run your app
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    Extract thumbnail without reading the whole image file: (C# - VB)
    Apply texture to bitmaps: (C# - VB)
    Extended console library: (VB)
    Save JPEG with a certain quality (image compression): (C# - VB )
    VB.NET to C# conversion tips!!
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