//Updates the Form's display using API calls
public void UpdateFormDisplay(Image backgroundImage)
{
IntPtr screenDc = API.GetDC(IntPtr.Zero);
IntPtr memDc = API.CreateCompatibleDC(screenDc);
IntPtr hBitmap = IntPtr.Zero;
IntPtr oldBitmap = IntPtr.Zero;
try
{
//Display-image
Bitmap bmp = new Bitmap(backgroundImage);
hBitmap = bmp.GetHbitmap(Color.FromArgb(0)); //Set the fact that background is transparent
oldBitmap = API.SelectObject(memDc, hBitmap);
//Display-rectangle
Size size = bmp.Size;
Point pointSource = new Point(0, 0);
Point topPos = new Point(this.Left, this.Top);
//Set up blending options
API.BLENDFUNCTION blend = new API.BLENDFUNCTION();
blend.BlendOp = API.AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = 255;
blend.AlphaFormat = API.AC_SRC_ALPHA;
API.UpdateLayeredWindow(this.Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, API.ULW_ALPHA);
//Clean-up
bmp.Dispose();
API.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
API.SelectObject(memDc, oldBitmap);
API.DeleteObject(hBitmap);
}
API.DeleteDC(memDc);
}
catch (Exception)
{
}
}
//Updates the Form's display using API calls
public void UpdateFormDisplay(Image backgroundImage)
{
IntPtr screenDc = API.GetDC(IntPtr.Zero);
IntPtr memDc = API.CreateCompatibleDC(screenDc);
IntPtr hBitmap = IntPtr.Zero;
IntPtr oldBitmap = IntPtr.Zero;
try
{
//Display-image
Bitmap bmp = new Bitmap(backgroundImage);
hBitmap = bmp.GetHbitmap(Color.FromArgb(0)); //Set the fact that background is transparent
oldBitmap = API.SelectObject(memDc, hBitmap);
//Display-rectangle
Size size = bmp.Size;
Point pointSource = new Point(0, 0);
Point topPos = new Point(this.Left, this.Top);
//Set up blending options
API.BLENDFUNCTION blend = new API.BLENDFUNCTION();
blend.BlendOp = API.AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = 255;
blend.AlphaFormat = API.AC_SRC_ALPHA;
API.UpdateLayeredWindow(this.Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, API.ULW_ALPHA);
//Clean-up
bmp.Dispose();
API.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
API.SelectObject(memDc, oldBitmap);
API.DeleteObject(hBitmap);
}
API.DeleteDC(memDc);
}
catch (Exception)
{
}
}
