Winform中实现颜色拾取器获取RGB与16进制颜色程序与源码分享
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2024-01-31 23:02:10
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场景
效果
实现
关键代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace GetColor
{
public partial class FrmGetColor : Form
{
public FrmGetColor()
{
InitializeComponent();
}
#region 定义快捷键
//如果函数执行成功,返回值不为0。
//如果函数执行失败,返回值为0。要得到扩展错误信息,调用GetLastError。
[DllImport("user32.dll", SetLastError = true)]
public static extern bool RegisterHotKey(
IntPtr hWnd, //要定义热键的窗口的句柄
int id, //定义热键ID(不能与其它ID重复)
KeyModifiers fsModifiers, //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效
Keys vk //定义热键的内容
);
[DllImport("user32.dll", SetLastError = true)]
public static extern bool UnregisterHotKey(
IntPtr hWnd, //要取消热键的窗口的句柄
int id //要取消热键的ID
);
//定义了辅助键的名称(将数字转变为字符以便于记忆,也可去除此枚举而直接使用数值)
[Flags()]
public enum KeyModifiers
{
None = 0,
Alt = 1,
Ctrl = 2,
Shift = 4,
WindowsKey = 8
}
#endregion
[DllImport("gdi32.dll")]
static public extern uint GetPixel(IntPtr hDC,int XPos,int YPos);
[DllImport("gdi32.dll")]
static public extern IntPtr CreateDC(string driverName,string deviceName,string output,IntPtr lpinitData);
[DllImport("gdi32.dll")]
static public extern bool DeleteDC(IntPtr DC);
static public byte GetRValue(uint color)
{
return (byte)color;
}
static public byte GetGValue(uint color)
{
return ((byte)(((short)(color))>>8));
}
static public byte GetBValue(uint color)
{
return ((byte)((color)>>16));
}
static public byte GetAValue(uint color)
{
return ((byte)((color)>>24));
}
public Color GetColor(Point screenPoint)
{
IntPtr displayDC = CreateDC("DISPLAY",null,null,IntPtr.Zero);
uint colorref = GetPixel(displayDC,screenPoint.X,screenPoint.Y);
DeleteDC(displayDC);
byte Red = GetRValue(colorref);
byte Green = GetGValue(colorref);
byte Blue = GetBValue(colorref);
return Color.FromArgb(Red, Green, Blue);
}
private void FrmGetColor_Load(object sender, EventArgs e)
{
this.TopMost = true;
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked == true)
{
this.TopMost = true;
}
else
{
this.TopMost = false;
}
}
private void timer1_Tick(object sender, EventArgs e)
{
txtPoint.Text=Control.MousePosition.X.ToString()+","+Control.MousePosition.Y.ToString();
Point pt = new Point(Control.MousePosition.X, Control.MousePosition.Y);
Color cl = GetColor(pt);
panel1.BackColor = cl;
txtRGB.Text = cl.R + "," + cl.G + "," + cl.B;
txtColor.Text = ColorTranslator.ToHtml(cl).ToString();
RegisterHotKey(Handle, 81, KeyModifiers.Ctrl, Keys.F);
}
private void button1_Click(object sender, EventArgs e)
{
Application.Exit();
}
protected override void WndProc(ref Message m)
{
const int WM_HOTKEY = 0x0312;
//按快捷键
switch (m.Msg)
{
case WM_HOTKEY:
switch (m.WParam.ToInt32())
{
case 81: //按下的是CTRL+F
Clipboard.SetText(txtColor.Text.Trim());
break;
}
break;
}
base.WndProc(ref m);
}
private void FrmGetColor_Leave(object sender, EventArgs e)
{
}
private void FrmGetColor_FormClosed(object sender, FormClosedEventArgs e)
{
//注销Id号为81的热键设定
UnregisterHotKey(Handle, 81);
}
}
}
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