C#根据文本框存取图像

来源：互联网发布：淘宝开店要6688的费用编辑：程序博客网时间：2024/05/19 09:03

由于本人做图像自动识别系统，用到模板特征匹配的方法，于是系统自然要存储大量的图像模板，模板要能随时存入、删除与取出，系统完整的代码不方便给出，给个最初编写的存储演示的小程序，其功能界面如下：

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//coded by langyue_wu@163.com
using System.Data.SqlClient;
using System.IO;

namespace shujuku
{
    public partial class Form1 : Form
    {   public int i=0;
        private string connString="Data Source=BLUESKY//SQLEXPRESS;Initial Catalog=Picture;Integrated Security=True";
        SqlConnection conn;
        SqlDataAdapter adapter;
        DataSet dataset;

        public Form1()
        {
            InitializeComponent();
            string sqlstr = "select * from pict";
            conn = new SqlConnection(connString);
            adapter = new SqlDataAdapter(sqlstr, conn);
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
            adapter.UpdateCommand = builder.GetUpdateCommand();
            dataset = new DataSet();
            adapter.Fill(dataset, "pict");

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: 这行代码将数据加载到表“pictureDataSet.pict”中。您可以根据需要移动或移除它。
           // this.pictTableAdapter.Fill(this.pictureDataSet.pict);

}

private void ShowImage()
{

            byte[] bytes = (byte[])dataset.Tables[0].Rows[i][1];
            MemoryStream memStream = new MemoryStream(bytes);
            try
            {
                Bitmap myImage = new Bitmap(memStream);
                this.pictureBox1.Image = myImage;
            }

            catch
            {
                this.pictureBox1.Image = null;
            }

}

        private void buttonSave_Click(object sender, EventArgs e)
        {
            adapter.Update(dataset, "pict");
            MessageBox.Show("保存成功");
        }

private void buttonUpdateImage_Click(object sender, EventArgs e)
{

            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.ShowDialog();
            if (openFileDialog1.FileName.Trim()!="")
            {

                Stream myStream = openFileDialog1.OpenFile();
                int length = (int)myStream.Length;
                byte[] bytes = new byte[length];
                myStream.Read(bytes, 0, length);
                myStream.Close();
                dataset.Tables[0].Rows[i][1] = bytes;
                dataset.Tables[0].Rows[i][0] = textBox1.Text;
                ShowImage();
                i++;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //string strSql = "SELECT count(*) FROM pict where name=" + textBox1.Text;
            string strSql = "SELECT * FROM pict where name=" + "'"+textBox1.Text+"'";
            conn = new SqlConnection(connString);
            SqlCommand cmd = new SqlCommand(strSql, conn);
            //打开数据库连接
            this.conn.Open();
            //执行Sql语句
            SqlDataReader MyReader=cmd.ExecuteReader(CommandBehavior.CloseConnection);

            MyReader.Read();
            MemoryStream MyMemoryStream=new MemoryStream((byte[])MyReader["img"]);
            //创建一个 Image 对象,并赋值给 Picture对象的 Image 属性
            this.pictureBox1.Image = Image.FromStream(MyMemoryStream);
            //关闭内存流
            MyMemoryStream.Close();
            MyReader.Close();
        }

}
}

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