From Xojo Documentation

Flash App Indicator in Task Bar

Declare Function FlashWindow Lib "User32" (HWND As Integer, invert As Boolean) As Boolean
Call FlashWindow(MyWindow.Handle, True) ' flash once

Enable Window Compositing

Sub EnableComposite(w As Window)
#If TargetWindows
Const GWL_EXSTYLE = -20
Const WS_EX_COMPOSITED = &h2000000

Declare Function GetWindowLongW Lib "user32" (hwnd As Integer, nIndex As Int32) As Integer
Dim style As Integer = GetWindowLongW(w.Handle, GWL_EXSTYLE)
style = BitwiseOr(style, WS_EX_COMPOSITED)

Declare Sub SetWindowLongW Lib "user32" (hwnd As Integer, nIndex As Int32, dwNewLong As Integer)
SetWindowLongW(w.Handle, GWL_EXSTYLE, style)
End Sub

Declare Example Projects

  • Examples/Advanced/GetPID
  • Examples/Advanced/WindowOpacity
  • Examples/Platform-Specific/Windows/CommandLinkExample
  • Examples/Platform-Specific/Windows/CPUUsage
  • Examples/Platform-Specific/Windows/CustomWindowShape
  • Examples/Platform-Specific/Windows/DeclareDrawing
  • Examples/Platform-Specific/Windows/SetWindowIcon

Other Resources

These external sources of information might also be helpful when working with Declares on Windows:

See Also