WinForms(.NET)的屏幕截图选取器组件

在表单构造函数中(在initializecomponent();call之后),添加:

monitor.MouseMove += new MouseEventHandler(monitor_MouseMove);
monitor.MouseLeave += new EventHandler(monitor_MouseLeave);
monitor.MouseClick += new MouseEventHandler(monitor_MouseClick);

现在将以下内容添加到表单类中:

const int adjustX = -50;
const int adjustY = -50;

public Size boxSize = new Size(100, 100);
public int lastX = 2 * adjustX;
public int lastY = 2 * adjustY;

private void monitor_MouseMove(object sender, MouseEventArgs e) {
  if (e.X != lastX || e.Y != lastY) {
    Graphics g = monitor.CreateGraphics();

    g.CopyFromScreen(monitor.PointToScreen(new Point(lastX + adjustX, lastY + adjustY)), new Point(lastX + adjustX, lastY + adjustY), boxSize, CopyPixelOperation.DestinationInvert);

    lastX = e.X;
    lastY = e.Y;

    g.CopyFromScreen(monitor.PointToScreen(new Point(e.X + adjustX, e.Y + adjustY)), new Point(e.X + adjustX, e.Y + adjustY), boxSize, CopyPixelOperation.DestinationInvert);
  }
}

void monitor_MouseLeave(object sender, EventArgs e) {
  Graphics g = monitor.CreateGraphics();

  g.CopyFromScreen(monitor.PointToScreen(new Point(lastX + adjustX, lastY + adjustY)), new Point(lastX + adjustX, lastY + adjustY), boxSize, CopyPixelOperation.DestinationInvert);

  lastX = 2 * adjustX;
  lastY = 2 * adjustY;
}

最后,在鼠标单击处理程序中:

void monitor_MouseClick(object sender, MouseEventArgs e) {

}

您必须添加您想要对所选区域执行的任何操作。您可以将其复制到另一个图片框,将其保存为位图。