private static extern bool UpdateLayeredWindow(
IntPtr hwnd,
IntPtr hdcDst,
ref BstCursor.Pointer.Win32Point pptDst,
ref BstCursor.Pointer.Win32Size psize,
IntPtr hdcSrc,
ref BstCursor.Pointer.Win32Point pprSrc,
int crKey,
ref BstCursor.Pointer.BLENDFUNCTION pblend,
int dwFlags);
public void Update(int x, int y)
{
IntPtr dc = BstCursor.Pointer.GetDC(IntPtr.Zero);
IntPtr compatibleDc = BstCursor.Pointer.CreateCompatibleDC(dc);
IntPtr hObject1 = IntPtr.Zero;
IntPtr hObject2 = IntPtr.Zero;
try
{
hObject1 = this.mBitmap.GetHbitmap(Color.FromArgb(0));
hObject2 = BstCursor.Pointer.SelectObject(compatibleDc, hObject1);
BstCursor.Pointer.Win32Size psize = new BstCursor.Pointer.Win32Size(this.mBitmap.Width, this.mBitmap.Height);
BstCursor.Pointer.Win32Point pprSrc = new BstCursor.Pointer.Win32Point(0, 0);
BstCursor.Pointer.Win32Point pptDst = new BstCursor.Pointer.Win32Point(x, y);
BstCursor.Pointer.BLENDFUNCTION pblend = new BstCursor.Pointer.BLENDFUNCTION()
{
BlendOp = 0,
BlendFlags = 0,
SourceConstantAlpha = byte.MaxValue,
AlphaFormat = 1
};
if (BstCursor.Pointer.UpdateLayeredWindow(this.Handle, dc, ref pptDst, ref psize, compatibleDc, ref pprSrc, 0, ref pblend, 2))
{
return;
}
CommonError.ThrowLastWin32Error("Cannot update layered window");
}
finally
{
BstCursor.Pointer.ReleaseDC(IntPtr.Zero, dc);
if (hObject1 != IntPtr.Zero)
{
BstCursor.Pointer.SelectObject(compatibleDc, hObject2);
BstCursor.Pointer.DeleteObject(hObject1);
}
BstCursor.Pointer.DeleteDC(compatibleDc);
}
}