C＃_ Convert camera images to bitmap format and draw Crosshairs

  Before MFC Yes, it is OpenCV How to draw a line and then display it to the control ,C# Next use OpenCV Haven't studied , But refer to converting the image into Bitmap Format and then draw lines can also be achieved

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

using System.Diagnostics;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

using DVPCameraType;// The camera SDK Namespace 

namespace DrawCross
{
    public partial class Form1 : Form
    {
        public static IntPtr m_ptr_wnd = new IntPtr();
        public static IntPtr m_ptr = new IntPtr();
        private DVPCamera.dvpStreamCallback _proc;
        uint m_handle = 0;// Camera handle 

        public static bool m_draw=false;
        public static Form1 lpsf;//Bitmap Map handle 

        public Form1()
        {
            InitializeComponent();
            m_ptr_wnd = pictureBox1.Handle;// Map control handle 

            lpsf = this;

            Select.Items.Clear();// Clear the list each time you click the enumerate button 
            int item;// Drop down list item index 
            uint count = 0;// Number of equipment 
            dvpCameraInfo dev_info = new dvpCameraInfo();// Camera information structure 
            DVPCamera.dvpRefresh(ref count);// Refresh the number of cameras 
            for (uint i = 0; i < count; i++)
            {
                DVPCamera.dvpEnum(i, ref dev_info);// enumeration 
                item = Select.Items.Add(dev_info.FriendlyName);// Add to drop-down list , Returns the 0
                Select.SelectedIndex = item;// Set the drop-down list item as the first index 
            }
        }

        //private ColorPalette tempPalette;

        /* Video stream callback function */
        public static int _dvpStreamCallback(uint handle, dvpStreamEvent _event, IntPtr pContext, ref dvpFrame refFrame, IntPtr pBuffer)
        {
            if(m_draw)
            {
                /* Draw crosshairs */

                // transformation BMP Bitmap 
                Bitmap bmp = null;
                if (refFrame.format == dvpImageFormat.FORMAT_BGR24)
                {
                    bmp = new Bitmap(refFrame.iWidth, refFrame.iHeight, refFrame.iWidth * 3, PixelFormat.Format24bppRgb, pBuffer);
                }
                else if (refFrame.format == dvpImageFormat.FORMAT_MONO)
                {
                    ColorPalette tempPalette;
                    bmp = new Bitmap(refFrame.iWidth, refFrame.iHeight, refFrame.iWidth, PixelFormat.Format8bppIndexed, pBuffer);

                    tempPalette = bmp.Palette;
                    for (int i = 0; i < 255; i++)
                    {
                        tempPalette.Entries[i] = System.Drawing.Color.FromArgb(0, i, i, i);
                    }
                    bmp.Palette = tempPalette;
                }

                //bmp.Save("D:\\" + count++ + ".jpeg", ImageFormat.Jpeg);

                //return 0;
                #region
                Bitmap rgb = new Bitmap(refFrame.iWidth, refFrame.iHeight);
                Graphics g = Graphics.FromImage(bmp);

                Pen mypen = new Pen(Color.Red, 4);
                Brush nBrush = new SolidBrush(Color.Blue);
                int a;
                Font font = new Font(" Microsoft YaHei ", 56);

                g.DrawImage(bmp, 0, 0, refFrame.iWidth, refFrame.iHeight);

                a = refFrame.iHeight / 2;
                g.DrawLine(mypen, 0, a, refFrame.iWidth, a);

                a = refFrame.iWidth / 2;
                g.DrawLine(mypen, a, 0, a, refFrame.iHeight);

                //g.DrawString("DuShen", font, nBrush, refFrame.iWidth / 2, refFrame.iHeight / 2);

                lpsf.pictureBox1.Image = bmp;
                #endregion
            }
            else
            {
                // Paint image data to the map control 
                dvpStatus status = DVPCamera.dvpDrawPicture(ref refFrame, pBuffer, m_ptr_wnd, (IntPtr)0, (IntPtr)0);
            }
            
            return 0;
        }

        private void Refresh_Click(object sender, EventArgs e)
        {
            Select.Items.Clear();// Clear the list each time you click the enumerate button 
            int item;// Drop down list item index 
            uint count = 0;// Number of equipment 
            dvpCameraInfo dev_info = new dvpCameraInfo();// Camera information structure 
            DVPCamera.dvpRefresh(ref count);// Refresh the number of cameras 
            for (uint i = 0; i < count; i++)
            {
                DVPCamera.dvpEnum(i, ref dev_info);// enumeration 
                item = Select.Items.Add(dev_info.FriendlyName);// Add to drop-down list , Returns the 0
                Select.SelectedIndex = item;// Set the drop-down list item as the first index 
            }
        }

        private void Open_Click(object sender, EventArgs e)
        {
            DVPCamera.dvpOpenByName(Select.Text, dvpOpenMode.OPEN_NORMAL, ref m_handle);// open 

            // Register the video stream callback function 
            _proc = _dvpStreamCallback;
            DVPCamera.dvpRegisterStreamCallback(m_handle, _proc, dvpStreamEvent.STREAM_EVENT_PROCESSED, m_ptr);
            DVPCamera.dvpSetTargetFormat(m_handle, dvpStreamFormat.S_BGR24);
            dvpStatus status = DVPCamera.dvpStart(m_handle);// Start the video stream 
        }

        private void Set_Click(object sender, EventArgs e)
        {
            DVPCamera.dvpShowPropertyModalDialog(m_handle, this.Handle);// Parameter setting window 
        }

        private void DrawCross_CheckedChanged(object sender, EventArgs e)
        {
            if(DrawCross.Checked)
            {
                m_draw = true;
            }
            else
            {
                m_draw = false;
            }
        }
    }
}