编写一个类似qq的屏幕捕捉程序

昨天晚上搞了很久，其实是很无聊
随便做了个程序，实现了像qq一样的抓屏功能
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace gowk.forms
{
/// <summary>
/// CaptureForm 的摘要说明。
/// </summary>
public class CaptureForm : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
Point op;
Rectangle area=Rectangle.Empty;
private Image img;
public CaptureForm()
{
this.SetStyle(ControlStyles.DoubleBuffer|ControlStyles.AllPaintingInWmPaint|ControlStyles.UserPaint,true);
InitializeComponent();
this.Bounds=System.Windows.Forms.Screen.PrimaryScreen.Bounds;
this.BackgroundImage=this.GetDestopImage();
}
public Image Image
{
get{return this.img;}
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private Image GetDestopImage()
{
Rectangle area=System.Windows.Forms.Screen.PrimaryScreen.Bounds;
Bitmap bm=new Bitmap(area.Width,area.Height);
Graphics g=Graphics.FromImage(bm);
System.IntPtr p=g.GetHdc();
IntPtr c=GetDesktopWindow();
//gowk.common.API.SendMessage(c,gowk.common.API.WM_PRINT,p,new IntPtr(gowk.common.API.PRF_CLIENT|gowk.common.API.PRF_NONCLIENT|gowk.common.API.PRF_CHILDREN|gowk.common.API.PRF_ERASEBKGND));
System.IntPtr ddc=GetDC(c);
gowk.common.API.BitBlt(p,0,0,this.Width,this.Height,ddc,0,0,gowk.common.API.SRCCOPY);
gowk.common.API.ReleaseDC(c,ddc);
g.ReleaseHdc(p);
return bm;
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
//
// CaptureForm
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 273);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "CaptureForm";
this.Text = "CaptureForm";
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
this.Click += new System.EventHandler(this.CaptureForm_Click);
this.DoubleClick += new System.EventHandler(this.CaptureForm_DoubleClick);
}
#endregion

[DllImport("user32.dll",EntryPoint="GetDC")]
public static extern IntPtr GetDC(IntPtr ptr);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr GetDesktopWindow();
private void CaptureForm_DoubleClick(object sender, System.EventArgs e)
{
Bitmap bm=new Bitmap(this.BackgroundImage);
this.img=bm.Clone(this.area,System.Drawing.Imaging.PixelFormat.Format16bppArgb1555);
this.DialogResult=DialogResult.OK;
}
int index=-1;
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown (e);
if(this.area==Rectangle.Empty && e.Button==MouseButtons.Left)
{
this.area.Location=new Point(e.X,e.Y);
}
this.op=new Point(e.X,e.Y);
this.index=this.GetSelectedHandle(new Point(e.X,e.Y));
this.SetCursor();
}
private int GetSelectedHandle(Point p)
{
int index=-1;
for(int i=1;i<9;i++)
{
if(GetHandleRect(i).Contains(p))
{
index=i;
break;
}
}
if(this.area.Contains(p))index=0;
System.Diagnostics.Trace.WriteLine(area.ToString());
System.Diagnostics.Trace.WriteLine(p.ToString());
System.Diagnostics.Trace.WriteLine(index.ToString());
return index;
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove (e);
if(this.Capture)
{
this.MoveHandleTo(new Point(e.X,e.Y));
this.Invalidate();
}
else
{
this.index=this.GetSelectedHandle(new Point(e.X,e.Y));
this.SetCursor();
}
}
private void MoveHandleTo(Point point)
{
int left = area.Left;
int top = area.Top;
int right = area.Right;
int bottom = area.Bottom;
switch ( index )
{
case 0:
area.X+=point.X-op.X;
area.Y+=point.Y-op.Y;
this.op=point;
return;
case 1:
left = point.X;
top = point.Y;
break;
case 2:
top = point.Y;
break;
case 3:
right = point.X;
top = point.Y;
break;
case 4:
right = point.X;
break;
case 5:
right = point.X;
bottom = point.Y;
break;
case 6:
bottom = point.Y;
break;
case 7:
left = point.X;
bottom = point.Y;
break;
case 8:
left = point.X;
break;
}
this.op=point;
area.X=left;
area.Y=top;
area.Width=right-left;
area.Height=bottom-top;
}
private void SetCursor()
{
Cursor cr=Cursors.Default;
if(index==1 ||index==5)
{
cr=Cursors.SizeNWSE;
}
else if(index==2 ||index==6)
{
cr=Cursors.SizeNS;
}
else if(index==3 ||index==7)
{
cr=Cursors.SizeNESW;
}
else if(index==4 ||index==8)
{
cr=Cursors.SizeWE;
}
else if(index==0)
{
cr=Cursors.SizeAll;
}
Cursor.Current=cr;
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp (e);
int left = area.Left;
int top = area.Top;
int right = area.Right;
int bottom = area.Bottom;
area.X=Math.Min(left,right);
area.Y=Math.Min(top,bottom);
area.Width=Math.Abs(left-right);
area.Height=Math.Abs(top-bottom);
if(e.Button==MouseButtons.Right)
{
if(this.area==Rectangle.Empty)
{
this.DialogResult=DialogResult.Cancel;
}
else
{
this.area=Rectangle.Empty;
this.Invalidate();
}
}
this.index=this.GetSelectedHandle(new Point(e.X,e.Y));
this.SetCursor();
}
protected override void OnPaint(PaintEventArgs e)
{
// base.OnPaint (e);
base.OnPaint(e);
e.Graphics.DrawRectangle(new Pen(this.ForeColor),this.area);

for(int i=1;i<9;i++)
{
e.Graphics.FillRectangle(new SolidBrush(Color.Red),this.GetHandleRect(i));
}
}
private Rectangle GetHandleRect(int index)
{
Point point = GetHandle(index);
return new Rectangle(point.X - 3, point.Y - 3, 7, 7);
}
private Point GetHandle(int index)
{
int x, y, xCenter, yCenter;
xCenter = area.X + area.Width/2;
yCenter = area.Y + area.Height/2;
x = area.X;
y = area.Y;
switch ( index )
{
case 1:
x = area.X;
y = area.Y;
break;
case 2:
x = xCenter;
y = area.Y;
break;
case 3:
x = area.Right;
y = area.Y;
break;
case 4:
x = area.Right;
y = yCenter;
break;
case 5:
x = area.Right;
y = area.Bottom;
break;
case 6:
x = xCenter;
y = area.Bottom;
break;
case 7:
x = area.X;
y = area.Bottom;
break;
case 8:
x = area.X;
y = yCenter;
break;
}
return new Point(x, y);
}
private void CaptureForm_Click(object sender, System.EventArgs e)
{
}
}
}