/// <summary>
/// Initializes a new instance of the <see cref="CaptureCursor"/> class.
/// </summary>
///
public CaptureCursor()
{
// By preallocating those we will prevent extra
// object allocations in middle of processing.
IntPtr desk = NativeMethods.GetDesktopWindow();
using (Graphics desktop = Graphics.FromHwnd(desk))
mask = SafeNativeMethods.CreateCompatibleDC(desktop);
cursorInfoSize = Marshal.SizeOf(typeof(CursorInfo));
}
/// <summary>
/// Creates a device context compatible with the specified surface.
/// </summary>
///
public static DeviceHandle CreateCompatibleDC(Graphics graphics)
{
if (graphics == null)
throw new ArgumentNullException("graphics");
IntPtr source = graphics.GetHdc();
IntPtr handle = NativeMethods.CreateCompatibleDC(source);
DeviceHandle dc = new DeviceHandle(handle);
graphics.ReleaseHdc(source);
return dc;
}
/// <summary>
/// Creates a device context compatible with the specified surface.
/// </summary>
///
public static DeviceHandle CreateCompatibleDC(Graphics graphics)
{
if (graphics == null)
{
throw new ArgumentNullException("graphics");
}
IntPtr source = graphics.GetHdc();
IntPtr handle = NativeMethods.CreateCompatibleDC(source);
DeviceHandle dc = new DeviceHandle(handle);
graphics.ReleaseHdc(source);
return(dc);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources
/// </summary>
///
/// <param name="disposing"><c>true</c> to release both managed
/// and unmanaged resources; <c>false</c> to release only unmanaged
/// resources.</param>
///
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// free managed resources
mask.Dispose();
mask = null;
}
}
