I need to draw a control on a layer window and it is not working.
code for layer window:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace VirtualIpod
{
public class Base : Form
{
public Base()
{
InitializeComponent();
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.SuspendLayout();
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
this.ClientSize = new System.Drawing.Size(323, 197);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.MouseDown += new MouseEventHandler(Base_MouseDown);
this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd,
int Msg, int wParam, int lParam);
[DllImportAttribute("user32.dll")]
public static extern bool ReleaseCapture();
private void Base_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
#region CUSTOM PAINT METHODS ----------------------------------------------
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00080000;
return cp;
}
}
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
{
Bitmap bmp = new Bitmap(backgroundImage);
hBitmap = bmp.GetHbitmap(Color.FromArgb(0));
oldBitmap = API.SelectObject(memDc, hBitmap);
Size size = bmp.Size;
Point pointSource = new Point(0, 0);
Point topPos = new Point(this.Left, this.Top);
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);
bmp.Dispose();
API.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero)
{
API.SelectObject(memDc, oldBitmap);
API.DeleteObject(hBitmap);
}
API.DeleteDC(memDc);
}
catch (Exception)
{
}
}
#endregion
#region FORM EVENTS -------------------------------------------------------
private void Form1_Load(object sender, EventArgs e)
{
UpdateFormDisplay(this.BackgroundImage);
}
protected override void OnPaint(PaintEventArgs e)
{
UpdateFormDisplay(this.BackgroundImage);
}
#endregion
}
internal class API
{
public const byte AC_SRC_OVER = 0x00;
public const byte AC_SRC_ALPHA = 0x01;
public const Int32 ULW_ALPHA = 0x00000002;
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct BLENDFUNCTION
{
public byte BlendOp;
public byte BlendFlags;
public byte SourceConstantAlpha;
public byte AlphaFormat;
}
[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("user32.dll", ExactSpelling = true)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
public static extern bool DeleteDC(IntPtr hdc);
[DllImport("gdi32.dll", ExactSpelling = true)]
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
[DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
public static extern bool DeleteObject(IntPtr hObject);
}
}
code for window that impements control and stuff:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace VirtualIpod
{
public class Form1 : Base
{
private Panel system = new Panel();
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
this.SuspendLayout();
this.system.Location = new Point(10, 10);
this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
this.Size = this.BackgroundImage.Size;
this.StartPosition = FormStartPosition.Manual;
this.BackgroundImageLayout = System.Windows.Forms.ImageLayout.None;
this.ClientSize = new System.Drawing.Size(287, 268);
this.Controls.Add(this.system);
this.Name = "Form1";
this.ResumeLayout(false);
}
}
}
the panel is not being drawn and I do not know how to fix it
thanx for any help