CODEWITHSUNDEEP
c#
Jon
Jon

Reputation: 2584

"No overload for method 'WndProc' takes 0 arguments"

protected override void WndProc(ref Message message)
    {
        if (message.Msg == WM_SETTINGCHANGE)
        {
            if (message.WParam.ToInt32() == SPI_SETDESKWALLPAPER)
            {
                // Handle that wallpaper has been changed.
            }
        }

        base.WndProc(ref message);
    }

    private void check_Tick(object sender, EventArgs e)
    {
        WndProc();
    }

I know that I'm missing something that goes in the () after WndProc, but I'm not sure what... Can someone help?

Upvotes: 0

Views: 230

Answers (2)

Mark Hall
Mark Hall

Reputation: 54532

When I put a breakpoint in the Windows Message Handler I noticed when the background changes it is receiving a Wparam of 42 not 20, it probably is a combination of Bits so you can try something like this.

protected override void WndProc(ref Message m)
{
    if (m.Msg == WM_SETTINGCHANGE)
    {
        if ((m.WParam.ToInt32() & (int)SPI_SETDESKWALLPAPER) == SPI_SETDESKWALLPAPER)
        {
            // Handle that wallpaper has been changed.
        }
    }

    base.WndProc(ref m);

}

If your are wanting to poll for changes with a timer you can create a Message then call the WndProc Method like this.

private void timer1_Tick(object sender, EventArgs e)
{
    Message m = new Message();
    m.Msg = (int)WM_SETTINGCHANGE;
    m.WParam = (IntPtr)SPI_SETDESKWALLPAPER;
    WndProc(ref m);

}

Upvotes: 1

ChaseTheSun
ChaseTheSun

Reputation: 3840

You don't need a timer to check for changes, that's the job of WndProc:

    private static readonly UInt32 SPI_SETDESKWALLPAPER = 0x14;
    private static readonly UInt32 WM_SETTINGCHANGE = 0x1A;

    protected override void WndProc(ref Message message)
    {
        if (message.Msg == WM_SETTINGCHANGE)
        {
            if (message.WParam.ToInt32() == SPI_SETDESKWALLPAPER)
            {
                // Handle that wallpaper has been changed.]
                 Console.Beep();
            }
        }

        base.WndProc(ref message);
    }

Upvotes: 1

Related Questions