C# 截屏工具纯源码

FormCaptureScreen.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Runtime.InteropServices;

namespace PictureCopy
{
public partial class FormCaptureScreen : Form
{
public static Image image = null;

public FormCaptureScreen()
{
InitializeComponent();
}

protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (image != null)
{
this.picbox.Image = image;
}
else
{
this.picbox.Image = null;
this.picbox.Refresh();
}
}

[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
public static extern bool BitBlt(
IntPtr hdcDest, //目标设备的句柄
int nXDest, // 目标对象的左上角的X坐标
int nYDest, // 目标对象的左上角的X坐标
int nWidth, // 目标对象的矩形的宽度
int nHeight, // 目标对象的矩形的长度
IntPtr hdcSrc, // 源设备的句柄
int nXSrc, // 源对象的左上角的X坐标
int nYSrc, // 源对象的左上角的X坐标
System.Int32 dwRop // 光栅的操作值
);

private void exitButton_Click(object sender, EventArgs e)
{
Application.Exit();
}

private void aboutButton_Click(object sender, EventArgs e)
{
MessageBox.Show("Code by Star in 2006-7-27,E_mail: fan178@gmail.com ,thank you to use this.");
}

private void saveButton_Click(object sender, EventArgs e)
{
bool isSave = true;
SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "Capture screen image save dialog";
saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";

if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveImageDialog.FileName.ToString();

if (fileName != "" && fileName != null)
{
string fileExtName = fileName.Substring(fileName.LastIndexOf(".") + 1).ToString();

System.Drawing.Imaging.ImageFormat imgformat = null;

if (fileExtName != "")
{
switch (fileExtName)
{
case "jpg":
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
break;
case "bmp":
imgformat = System.Drawing.Imaging.ImageFormat.Bmp;
break;
case "gif":
imgformat = System.Drawing.Imaging.ImageFormat.Gif;
break;
default:
MessageBox.Show("只能存取为: jpg,bmp,gif 格式");
isSave = false;
break;
}

}

//默认保存为JPG格式
if (imgformat == null)
{
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
}

if (isSave)
{
try
{
FormCaptureScreen.image.Save(fileName, imgformat);
MessageBox.Show("图片已经成功保存!~~");
}
catch
{
MessageBox.Show("保存失败,你还没有截取过图片或已经清空图片!");
}
}

}

}
}

private void clearButton_Click(object sender, EventArgs e)
{
image = null;
this.Invalidate();

}

private void mouseButton_Click(object sender, EventArgs e)
{
MouseCaptureForm mouseCapture = new MouseCaptureForm();
mouseCapture.Show();
}

private void fullScreenButton_Click(object sender, EventArgs e)
{
FormCaptureScreen.image = windowFullScreen();
picbox.Image = FormCaptureScreen.image;
}

public static Bitmap windowFullScreen()
{
//建立屏幕Graphics
Graphics grpScreen = Graphics.FromHwnd(IntPtr.Zero);
//根据屏幕大小建立位图
Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, grpScreen);
//建立位图相关Graphics
Graphics grpBitmap = Graphics.FromImage(bitmap);
//建立屏幕上下文
IntPtr hdcScreen = grpScreen.GetHdc();
//建立位图上下文
IntPtr hdcBitmap = grpBitmap.GetHdc();
//将屏幕捕获保存在图位中
BitBlt(hdcBitmap, 0, 0, bitmap.Width, bitmap.Height, hdcScreen, 0, 0, 0x00CC0020);
//关闭位图句柄
grpBitmap.ReleaseHdc(hdcBitmap);
//关闭屏幕句柄
grpScreen.ReleaseHdc(hdcScreen);
//释放位图对像
grpBitmap.Dispose();
//释放屏幕对像
grpScreen.Dispose();

//返回捕获位图
return bitmap;
}

private void mouseCaptureBtn_Click(object sender, System.EventArgs e)
{
MouseCaptureForm mouseCapture = new MouseCaptureForm();
mouseCapture.Show();

}

private void CaptureScreenForm_Load(object sender, EventArgs e)
{
WindowState = FormWindowState.Maximized;
}
}
}

另一个窗体的代码：

MouseCaptureForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace PictureCopy
{
public partial class MouseCaptureForm : Form
{
public MouseCaptureForm()
{
this.Bounds = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
this.BackgroundImage = FormCaptureScreen.windowFullScreen();
InitializeComponent();
}

private Point pot;
private Rectangle area = Rectangle.Empty;
private Image img;
private int index = -1;
private string noselectString = "/n．请按下鼠标左键不放拖动选取截图区域/n/n ．单击鼠标右键或按ESC取消截图";
private string selectingString = "/n．松开鼠标左键确定选取范围/n/n．按ESC重新选择";
private string selectedString = "/n．按鼠标左键调整选择范围/n/n ．双击鼠标左键保存截图 /n/n．按鼠标右键重新选择 /n/n．ESC键取消截图";

protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
{
if (this.area == Rectangle.Empty && e.Button == MouseButtons.Left)
{
this.tiptext.Text = selectingString;
this.area.Location = new Point(e.X, e.Y);
}
this.pot = new Point(e.X, e.Y);
this.index = this.GetSelectedHandle(new Point(e.X, e.Y));
this.SetCursor();
}
}

/// <summary>
/// 设置鼠标方案
/// </summary>
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 OnPaint(PaintEventArgs 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.Green), this.GetHandleRect(i));
}
}

private Rectangle GetHandleRect(int index)
{
Point point = GetHandle(index);
return new Rectangle(point.X - 3, point.Y - 3, 6, 6);
}

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);
}

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);
this.tiptext.Text = selectedString;
if (e.Button == MouseButtons.Right)
{
if (this.area == Rectangle.Empty)
{
this.Close();
}
else
{
this.area = Rectangle.Empty;
this.Invalidate();
}
}
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;

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 - this.pot.X;
area.Y += point.Y - pot.Y;
this.pot = 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.pot = point;
area.X = left;
area.Y = top;
area.Width = right - left;
area.Height = bottom - top;
}

private void MouseCaptureForm_DoubleClick_1(object sender, EventArgs e)
{
//修正截取图片过界提示内存不足BUG
int left = area.Left;
int right = area.Right;
int top = area.Top;
int bottom = area.Bottom;
if (left < Screen.PrimaryScreen.Bounds.Left)
{ left = Screen.PrimaryScreen.Bounds.Left; }
if (right > Screen.PrimaryScreen.Bounds.Right)
{ right = Screen.PrimaryScreen.Bounds.Right; }
if (top < Screen.PrimaryScreen.Bounds.Top)
{ top = Screen.PrimaryScreen.Bounds.Top; }
if (bottom > Screen.PrimaryScreen.Bounds.Bottom)
{ bottom = Screen.PrimaryScreen.Bounds.Bottom; }
area.X = left;
area.Y = top;
area.Width = right - left;
area.Height = bottom - top;

//截取选择区域图片
Bitmap bm = new Bitmap(this.BackgroundImage);
this.img = bm.Clone(this.area, System.Drawing.Imaging.PixelFormat.Format16bppArgb1555);
//Clipboard.SetDataObject(img);
FormCaptureScreen.image = img;
//FormCaptureScreen.ActiveForm.Invalidate();
this.Close();
}

private void MouseCaptureForm_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyData == Keys.Escape && System.Windows.Forms.Button.MouseButtons == MouseButtons.Left)
{
this.area = Rectangle.Empty;
this.Invalidate();
tiptext.Text = noselectString;
}
else if (e.KeyData == Keys.Escape)
{ this.Close(); }
}

private void MouseCaptureForm_Load(object sender, EventArgs e)
{
tiptext.Text = noselectString;

}

private void tiptext_MouseMove(object sender, MouseEventArgs e)
{
if (tiptext.Location.X == 10 && tiptext.Location.Y == 10)
{
Point formloc = new Point((Screen.PrimaryScreen.Bounds.Width - 176), 10);
tiptext.Location = formloc;
}
else
{ tiptext.Location = new Point(10, 10); }
}
}
}