/// <summary>
/// Activate a specified window.
/// </summary>
/// <param name="target">Target Window</param>
internal static void ActivateWindow(Window target)
{
var handleWindow = new WindowInteropHelper(target).Handle;
try
{
// Get process ID for target window's thread.
var targetWindowId = NativeMethod.GetWindowThreadProcessId(
handleWindow,
IntPtr.Zero);
if (targetWindowId == 0)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to get process ID for target window.");
}
// Get process ID for the foreground window's thread.
var foregroundWindow = NativeMethod.GetForegroundWindow();
if (foregroundWindow == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to get handle to the foreground window.");
}
var foregroundWindowId = NativeMethod.GetWindowThreadProcessId(
foregroundWindow,
IntPtr.Zero);
if (foregroundWindowId == 0)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to get process ID for the foreground window.");
}
if (targetWindowId != foregroundWindowId)
{
try
{
// Attach target window's thread to the foreground window's thread.
var result1 = NativeMethod.AttachThreadInput(
foregroundWindowId,
targetWindowId,
true);
if (!result1)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), String.Format("Failed to attach thread ({0}) to thread ({1}).", foregroundWindowId, targetWindowId));
}
// Set position of target window.
var result2 = NativeMethod.SetWindowPos(
handleWindow,
IntPtr.Zero,
0,
0,
0,
0,
NativeMethod.SWP_NOSIZE | NativeMethod.SWP_NOMOVE | NativeMethod.SWP_SHOWWINDOW);
if (!result2)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Failed to set position of target window.");
}
}
finally
{
// Detach target window's thread from the foreground window's thread.
var result3 = NativeMethod.AttachThreadInput(
foregroundWindowId,
targetWindowId,
false);
if (!result3)
{
throw new Win32Exception(Marshal.GetLastWin32Error(), String.Format("Failed to detach thread ({0}) from thread ({1}).", foregroundWindowId, targetWindowId));
}
}
}
}
catch (Win32Exception ex)
{
throw new Exception(String.Format("{0} (Code: {1}).", ex.Message.Substring(0, ex.Message.Length - 1), ex.ErrorCode), ex);
}
// Show and activate target window.
if (target.WindowState == WindowState.Minimized)
{
target.WindowState = WindowState.Normal;
}
target.Show();
target.Activate();
}
