[英]Partial screenshot with rectangle of selection c#
我正在尝试截取屏幕的部分屏幕截图并将其放在图片框中。 用户必须绘制一个矩形,然后我必须获取矩形内的部分。
protected override void OnMouseDown(MouseEventArgs e)
{
mRect = new Rectangle(e.X, e.Y, 0, 0);
this.Invalidate();
}
protected override void OnMouseMove(MouseEventArgs e)
{
if( e.Button == MouseButtons.Left)
{
mRect = new Rectangle(mRect.Left, mRect.Top, e.X - mRect.Left, e.Y - mRect.Top);
this.Invalidate();
}
}
protected override void OnPaint(PaintEventArgs e)
{
using(Pen pen = new Pen(Color.Red, 1))
{
e.Graphics.DrawRectangle(pen, mRect);
}
}
使用此代码,我可以绘制矩形,但是我不知道如何截屏。 也许使用CopyToScreen功能?
如果有人有想法?
谢谢!
这是我使用的一些代码-它占据了整个桌面
public static Bitmap GetScreenAsBmp()
{
int min_x=0, max_x=0, min_y=0, max_y=0;
foreach (Screen s in Screen.AllScreens)
{
min_x = MinOf(min_x, s.Bounds.Left);
max_x = MaxOf(max_x, s.Bounds.Right);
min_y = MinOf(min_y, s.Bounds.Top);
max_y = MaxOf(max_y, s.Bounds.Bottom);
}
Bitmap bmp = new Bitmap(max_x - min_x, max_y - min_y);
Graphics dst_dc = Graphics.FromImage(bmp);
dst_dc.CopyFromScreen(min_x, min_y, 0, 0, new Size(max_x - min_x, max_y - min_y));
dst_dc.Dispose();
return bmp;
}
这是该问题的完整解决方案。
它由一个Button
触发,然后:
Form
样式
Rectangle
所需的所有事件 MouseUp
之后)复制屏幕 Bitmap
复制到第一个PictureBox
上的PictureBox
的图像中。 请注意,许多视频重叠无法通过这种方式捕获!
请注意,此代码始终从第一个屏幕捕获!
为了获得最佳可用性,应该以某种方式告知用户,他应该在按下Button
并且窗口消失后才绘制框架!
要使用它,只需将一个Button
和一个PictureBox
添加到您的Form
。
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Form form2;
Point MD = Point.Empty;
Rectangle rect = Rectangle.Empty;
private void button2_Click(object sender, EventArgs e)
{
Hide();
form2 = new Form();
form2.BackColor = Color.Wheat;
form2.TransparencyKey = form2.BackColor;
form2.ControlBox = false;
form2.MaximizeBox = false;
form2.MinimizeBox = false;
form2.FormBorderStyle = FormBorderStyle.None;
form2.WindowState = FormWindowState.Maximized;
form2.MouseDown += form2_MouseDown;
form2.MouseMove += form2_MouseMove;
form2.Paint += form2_Paint;
form2.MouseUp += form2_MouseUp;
form2.Show();
}
void form2_MouseDown(object sender, MouseEventArgs e)
{
MD = e.Location;
}
void form2_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button !=MouseButtons.Left) return;
Point MM = e.Location;
rect = new Rectangle(Math.Min(MD.X, MM.X), Math.Min(MD.Y, MM.Y),
Math.Abs(MD.X - MM.X), Math.Abs(MD.Y - MM.Y));
form2.Invalidate();
}
void form2_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawRectangle(Pens.Red, rect);
}
void form2_MouseUp(object sender, MouseEventArgs e)
{
form2.Hide();
Screen scr = Screen.AllScreens[0];
Bitmap bmp = new Bitmap(rect.Width, rect.Height);
using (Graphics G = Graphics.FromImage(bmp))
{
G.CopyFromScreen(rect.Location, Point.Empty, rect.Size,
CopyPixelOperation.SourceCopy);
pictureBox1.Image = bmp;
}
form2.Close();
Show();
}
}
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