Dynamically gets the color of the cursor in the current screen

Dynamic//////////////////////////////////////////////////////////////////////////

Program: Screen Color

Function: Dynamically get the color of the cursor position in the current screen

Author: Tripoli

Network Name: upto (a ball)

Email: itfun@163.com

Date: March 31, 2004

//////////////////////////////////////////////////////////////////////////


Using System;
Using System.Drawing;
Using System.Collections;
Using System.ComponentModel;
Using System.Windows.Forms;
Using System.Data;
Using System.Drawing.Imaging;
Using System.Runtime.InteropServices;

Namespace Libo.colorpicker
{
<summary>
Summary description of the Form1.
</summary>
public class Form1:System.Windows.Forms.Form
{
Size of the desktop workspace
Size Workingarea;
The initial position of the Form and the position in the lower-left corner, the lower-right corner
Point Formloc, Ptleftbottom, Ptrightbottom;

Private System.Windows.Forms.Label Lblcolor;
Private System.Windows.Forms.TextBox Txtargb;
Private System.Windows.Forms.Timer TMR;
Private System.Windows.Forms.ToolTip tip;
Private System.ComponentModel.IContainer components;

Public Form1 ()
{
InitializeComponent ();

This. FormBorderStyle = Formborderstyle.fixedtoolwindow;
This. StartPosition = Formstartposition.centerscreen;

Rectangle rect = Systeminformation.workingarea;
Workingarea = new Size (rect. Width, Rect. Height);
Ptleftbottom = new Point (0, Workingarea.height-this. Height);
Ptrightbottom = new Point (workingarea.width-this. Width,
Workingarea.height-this. Height);

String tipmsg = "Double-click the left mouse button in the form blank to start taking the color, press ESC to determine the color";
Tip. SetToolTip (this, tipmsg);
Tip. SetToolTip (Lblcolor, tipmsg);
Tip. SetToolTip (Txtargb, tipmsg);
}

<summary>
Clean up all resources that are in use.
</summary>
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

#region Windows Form Designer generated code
<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</summary>
private void InitializeComponent ()
{
this.components = new System.ComponentModel.Container ();
This.lblcolor = new System.Windows.Forms.Label ();
THIS.TMR = new System.Windows.Forms.Timer (this.components);
This.txtargb = new System.Windows.Forms.TextBox ();
This.tip = new System.Windows.Forms.ToolTip (this.components);
This. SuspendLayout ();
//
Lblcolor
//
This.lblColor.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
This.lblColor.Location = new System.Drawing.Point (8, 8);
This.lblColor.Name = "Lblcolor";
This.lblColor.TabIndex = 0;
//
Tmr
//
This.tmr.Tick + = new System.EventHandler (This.tmr_tick);
//
Txtargb
//
This.txtArgb.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
This.txtArgb.Font = new System.Drawing.Font ("Arial", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte) (0));
This.txtArgb.Location = new System.Drawing.Point (8, 40);
This.txtArgb.Name = "Txtargb";
This.txtArgb.TabIndex = 1;
This.txtArgb.Text = "";
This.txtArgb.KeyPress + = new System.Windows.Forms.KeyPressEventHandler (this.txtargb_keypress);
//
Form1
//
This. AutoScaleBaseSize = new System.Drawing.Size (6, 14);
This. ClientSize = new System.Drawing.Size (115, 70);
This. Controls.Add (THIS.TXTARGB);
This. Controls.Add (This.lblcolor);
This. Name = "Form1";
This. Text = "screen take color (upto)";
This. DoubleClick + = new System.EventHandler (this. Form1_doubleclick);
This. MouseEnter + = new System.EventHandler (this. Form1_mouseenter);
This. ResumeLayout (FALSE);

}
#endregion

<summary>
The main entry point for the application.
</summary>
[STAThread]
static void Main ()
{
Application.Run (New Form1 ());
}

[DllImport ("Gdi32.dll")]
private static extern bool BitBlt (
IntPtr hdcdest,//handle of target device
int nxdest,//x coordinate of the upper-left corner of the target object
int nydest,//x coordinate of the upper-left corner of the target object
int nwidth,//The width of the rectangle of the target object
int nheight,//The length of the rectangle of the target object
IntPtr hdcsrc,//source device handle
int NXSRC,//x coordinate of the upper-left corner of the source object
int NYSRC,//x coordinate of the upper-left corner of the source object
int Dwrop//Raster operation value
);

[DllImport ("Gdi32.dll")]
private static extern IntPtr CreateDC (
String lpszdriver,//driver name
String lpszdevice,//device name
String lpszoutput,//useless, can be set to locate "NULL"
INTPTR Lpinitdata//Any printer data
);

private void Form1_doubleclick (object sender, EventArgs e)
{
Formloc = this. Location;
This. Location = Ptrightbottom;
This. topmost = true;
Tmr. Enabled = true;
}

private void Tmr_tick (object sender, EventArgs e)

{

To create a DC for the monitor

IntPtr Hdldisplay = CreateDC ("DISPLAY", NULL, NULL, IntPtr.Zero);

Creates a new Graphics object from the handle of the specified device

Graphics Gfxdisplay = GRAPHICS.FROMHDC (Hdldisplay);

Create a Bitmap object of only one pixel size

Bitmap bmp = New Bitmap (1, 1, gfxdisplay);

Creates a new Graphics object from the specified Image object

Graphics gfxbmp = graphics.fromimage (BMP);

Get the handle to the screen

IntPtr Hdlscreen = Gfxdisplay.gethdc ();

Get a handle to a bitmap

IntPtr hdlbmp = Gfxbmp.gethdc ();

Copy a pixel in the current screen where the mouse pointer is located in the bitmap

BitBlt (hdlbmp, 0, 0, 1, 1, Hdlscreen, mouseposition.x, MOUSEPOSITION.Y, 13369376);

Release screen handle

GFXDISPLAY.RELEASEHDC (Hdlscreen);

Releasing a bitmap handle

GFXBMP.RELEASEHDC (hdlbmp);

Lblcolor.backcolor = BMP. GetPixel (0, 0); Get the color of a pixel

Txtargb.text = "0x" + LblColor.BackColor.ToArgb (). ToString ("X"). ToUpper ();

Gfxdisplay.dispose ();
Gfxbmp.dispose ();

Bmp. Dispose (); Resources used to release BMP

}



private void Txtargb_keypress (object sender, KeyPressEventArgs e)
{
Determines the color ARGB value when the ESC key is pressed
Note: Valid only if the form is active
if (E.keychar = = (char) keys.escape)
{
Tmr. Enabled = false;
This. Location = Formloc;
This. topmost = false;
Txtargb.selectall ();
}
}

private void Form1_mouseenter (object sender, EventArgs e)
{
if (this. Location = = ptleftbottom)//form in the lower left corner
{
This. Location = Ptrightbottom;
}
else if (this. Location = = ptrightbottom)//form in the lower right corner
{
This. Location = Ptleftbottom;
}
}
}
}