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See IsWindowEnabled to determine whether a window is enabled.

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    public static extern bool IsWindowVisible(IntPtr hWnd);

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        if (user32.IsWindowVisible(hWnd) && string.IsNullOrEmpty(strTitle) == false)

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Summary

The IsWindowVisible API

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static extern bool IsWindowVisible(IntPtr hWnd);

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Private Shared Function IsWindowVisible(ByVal hWnd As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

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Public Declare Function IsWindowVisible Lib "user32" _

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extern bool IsWindowVisible(System.IntPtr hwnd)

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let isItShown = InteractiveNative.IsWindowVisible(intPointer)

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Documentation

[IsWindowVisible] on MSDN

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Summary

The IsWindowEnabled API

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static extern bool IsWindowEnabled(IntPtr hWnd);

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Private Shared Function IsWindowEnabled(ByVal hWnd As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

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Documentation

[IsWindowEnabled] on MSDN

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Summary

The IsWindowVisible API

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static extern bool IsWindowVisible(IntPtr hWnd);

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Private Shared Function IsWindowVisible(ByVal hWnd As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

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Public Declare Function IsWindowVisible Lib "user32" _

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extern bool IsWindowVisible(System.IntPtr hwnd)

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let isItShown = InteractiveNative.IsWindowVisible(intPointer)

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Documentation

[IsWindowVisible] on MSDN

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static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

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Declare Sub SwitchToThisWindow Lib "user32.dll" ( _

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                    SwitchToThisWindow(procProgram[nIndex].MainWindowHandle, true);

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Documentation

[SwitchToThisWindow] on MSDN

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        if (record.IsWindowsUnicodeFullFontName)

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        internal bool IsWindowsUnicodeFullFontName