在表单打开时将光标更改为交叉（代码段工具）

3 回答

• 1

  尝试将它放在Program.cs文件中

  static class Program
  {
      [DllImport("user32.dll")]
      static extern bool SetSystemCursor(IntPtr hcur, uint id);
      [DllImport("user32.dll")]
      static extern IntPtr LoadCursor(IntPtr hInstance, int lpCursorName);
  
      [DllImport("user32.dll", CharSet = CharSet.Auto)]
      private static extern Int32 SystemParametersInfo(UInt32 uiAction, UInt32
      uiParam, String pvParam, UInt32 fWinIni);
  
      private static uint CROSS = 32515;
      private static uint NORMAL = 32512;
      [STAThread]
      static void Main()
      {
          Application.EnableVisualStyles();
          Application.SetCompatibleTextRenderingDefault(false);
          SetSystemCursor(LoadCursor(IntPtr.Zero, (int)NORMAL), CROSS);
          //Also other pointers to CROSS if you want
          Application.Run(new Form1());
          SystemParametersInfo(0x0057, 0, null, 0);
      }
  }
  

  这将在应用程序结束或崩溃时将其恢复正常 .

  因此，如从Normal更改为Cross，您可以更改任何想要箭头的光标

  停止应用程序时，它将无法工作（Ctrl F5），因为这将跳过所有行 . 但是在发布应用程序后会完全运行 .

  回复于 2024-05-03T04:21:50+08:00
• 0

  制作两个表格 . 一个用于拍摄全屏快照，另一个用于裁剪所需区域 . 选择区域后，将获取的值传递给包含图像的表单并保存 .

  我将举一个例子，你只需添加两个表单，而无需在设计中做任何事情

  Form_ScreenShot

  public delegate void CROP_PARAMS(Point pnt, Size sz);
  public partial class Form_ScreenShot : Form
  {
      Form_TransparentSelection transpSelect;
      PictureBox pBox;
      public Form_ScreenShot()
      {
          InitializeComponent();
          WindowState = FormWindowState.Maximized;
          FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
          pBox = new PictureBox() { Dock = DockStyle.Fill, Cursor = Cursors.Cross };
          pBox.MouseDown += pBox_MouseDown;
          Controls.Add(pBox);
  
          Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
          Graphics grp = Graphics.FromImage(bmp);
          grp.CopyFromScreen(0, 0, 0, 0, new Size(bmp.Width, bmp.Height), CopyPixelOperation.SourceCopy);
          pBox.Image = bmp;
  
      }
  
      void CropImage(Point startPoint, Size size)
      {
          Bitmap bmp = new Bitmap(size.Width, size.Height);
          Graphics grp = Graphics.FromImage(bmp);
          grp.DrawImage(pBox.Image, new Rectangle(0, 0, size.Width, size.Height), new Rectangle(startPoint, size), GraphicsUnit.Pixel);
          pBox.Image = bmp;
          bmp.Save("D:\\Check1.png", System.Drawing.Imaging.ImageFormat.Png);
      }
  
      void pBox_MouseDown(object sender, MouseEventArgs e)
      {
          transpSelect = new Form_TransparentSelection(e) {CropImage = CropImage};
          transpSelect.ShowDialog();
          Close();
      }
  
  }
  

  现在半透明选择表格

  Form_TransparentSelection

  public partial class Form_TransparentSelection : Form
  {
      PictureBox pbSelection;
      Point lastPoint;
      public CROP_PARAMS CropImage { get; set; }
      public Form_TransparentSelection(MouseEventArgs e)
      {
          InitializeComponent();
          WindowState = FormWindowState.Maximized;
          FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
          MouseMove += Form_TransparentSelection_MouseMove;
          MouseUp += Form_TransparentSelection_MouseUp;
          Cursor = Cursors.Cross;
  
          pbSelection = new PictureBox() { Size = MinimumSize = new Size(5, 5), Visible = false, BackColor = Color.LightGreen };
          Controls.Add(pbSelection);
  
          lastPoint = new Point(e.X, e.Y);
          pbSelection.Size = pbSelection.MinimumSize;
          pbSelection.Visible = true;
          pbSelection.Location = lastPoint;
  
          Opacity = .5;
          TransparencyKey = Color.LightGreen;
          BackColor = Color.Black;
      }
  
      void Form_TransparentSelection_MouseUp(object sender, MouseEventArgs e)
      {
          CropImage(pbSelection.Location, pbSelection.Size);
          Close();
      }
  
      void Form_TransparentSelection_MouseMove(object sender, MouseEventArgs e)
      {
          pbSelection.Width = e.X - lastPoint.X;
          pbSelection.Height = e.Y - lastPoint.Y;
      }
  }
  

  回复于 2024-05-03T04:21:50+08:00
• -1

  在退出应用程序之前将光标设置为其默认值将解决该问题 . 这可以在 Form.Closing 事件中实现为：

  private void Form_Closing(object sender, System.ComponentModel.CancelEventArgs e)
  {
      // 'NORMAL' is the same constant that is in your code.
      SetSystemCursor(LoadCursor(IntPtr.Zero, NORMAL), NORMAL);
  }
  

  编辑：通过任务管理器中的"Kill Task"选项终止进程将触发 Form.Closing 事件 . 有no way来拦截一个 TerminateProcess() 调用，该调用与"Kill Process"选项一起使用 .

  回复于 2024-05-03T04:21:50+08:00