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如何在 SQL Server2000 中保存图像及读取图像信息         

如何在 SQL Server2000 中保存图像及读取图像信息

作者:闵涛 文章来源:闵涛的学习笔记 点击数:2775 更新时间:2007/11/14 11:05:31
nbsp; this.txtFilePath = new System.Windows.Forms.TextBox();
   this.btnUpload = new System.Windows.Forms.Button();
   this.groupBox2 = new System.Windows.Forms.GroupBox();
   this.ImgPictureBox = new System.Windows.Forms.PictureBox();
   this.btnDownLoad = new System.Windows.Forms.Button();
   this.MySqlCon = new System.Data.SqlClient.SqlConnection();
   this.labDescription = new System.Windows.Forms.Label();
   this.txtImage = new System.Windows.Forms.TextBox();
   this.groupBox1.SuspendLayout();
   this.groupBox2.SuspendLayout();
   this.SuspendLayout();
   //
   // labFilePath
   //
   this.labFilePath.Location = new System.Drawing.Point(8, 72);
   this.labFilePath.Name = "labFilePath";
   this.labFilePath.Size = new System.Drawing.Size(80, 16);
   this.labFilePath.TabIndex = 0;
   this.labFilePath.Text = "文件路径:";
   this.labFilePath.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
   //
   // groupBox1
   //
   this.groupBox1.Controls.Add(this.txtImage);
   this.groupBox1.Controls.Add(this.labDescription);
   this.groupBox1.Controls.Add(this.btnUpload);
   this.groupBox1.Controls.Add(this.txtFilePath);
   this.groupBox1.Controls.Add(this.labFilePath);
   this.groupBox1.Location = new System.Drawing.Point(8, 8);
   this.groupBox1.Name = "groupBox1";
   this.groupBox1.Size = new System.Drawing.Size(280, 128);
   this.groupBox1.TabIndex = 1;
   this.groupBox1.TabStop = false;
   this.groupBox1.Text = "文件上传给数据库";
   //
   // txtFilePath
   //
   this.txtFilePath.Location = new System.Drawing.Point(72, 64);
   this.txtFilePath.Name = "txtFilePath";
   this.txtFilePath.Size = new System.Drawing.Size(200, 21);
   this.txtFilePath.TabIndex = 1;
   this.txtFilePath.Text = "";
   //
   // btnUpload
   //
   this.btnUpload.Location = new System.Drawing.Point(192, 96);
   this.btnUpload.Name = "btnUpload";
   this.btnUpload.TabIndex = 2;
   this.btnUpload.Text = "开始上传";
   this.btnUpload.Click += new System.EventHandler(this.btnUpload_Click);
   //
   // groupBox2
   //
   this.groupBox2.Controls.Add(this.btnDownLoad);
   this.groupBox2.Controls.Add(this.ImgPictureBox);
   this.groupBox2.Location = new System.Drawing.Point(8, 144);
   this.groupBox2.Name = "groupBox2";
   this.groupBox2.Size = new System.Drawing.Size(280, 200);
   this.groupBox2.TabIndex = 2;
   this.groupBox2.TabStop = false;
   this.groupBox2.Text = "从数据库下载图像文件并预览图像";
   //
   // ImgPictureBox
   //
   this.ImgPictureBox.Location = new System.Drawing.Point(16, 24);
   this.ImgPictureBox.Name = "ImgPictureBox";
   this.ImgPictureBox.Size = new System.Drawing.Size(168, 160);
   this.ImgPictureBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
   this.ImgPictureBox.TabIndex = 0;
   this.ImgPictureBox.TabStop = false;
   //
   // btnDownLoad
   //
   this.btnDownLoad.Location = new System.Drawing.Point(192, 24);
   this.btnDownLoad.Name = "btnDownLoad";
   this.btnDownLoad.TabIndex = 1;
   this.btnDownLoad.Text = "开始下载";
   this.btnDownLoad.Click += new System.EventHandler(this.btnDownLoad_Click);
   //
   // MySqlCon 数据库的连接对象
   //
   this.MySqlCon.ConnectionString = "integrated security=SSPI;data source=.;persist security info=False;initial catalog=ezonedb";
   //
   // labDescription
   //
   this.labDescription.Location = new System.Drawing.Point(8, 32);
   this.labDescription.Name = "labDescription";
   this.labDescription.Size = new System.Drawing.Size(88, 16);
   this.labDescription.TabIndex = 3;
   this.labDescription.Text = "文件描述信息:";
   this.labDescription.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
   //
   // txtImage
   //
   this.txtImage.Location = new System.Drawing.Point(96, 24);
   this.txtImage.Name = "txtImage";
   this.txtImage.Size = new System.Drawing.Size(176, 21);
   this.txtImage.TabIndex = 4;
   this.txtImage.Text = "亿众国际 Ezone International";
   //
   // frmMain
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(292, 349);
   this.Controls.Add(this.groupBox2);
   this.Controls.Add(this.groupBox1);
   this.Name = "frmMain";
   this.Text = "Ezone International - 亿众国际";
   this.groupBox1.ResumeLayout(false);
   this.groupBox2.ResumeLayout(false);
   this.ResumeLayout(false);

  }

  [STAThread]
  static void Main()
  {
   Application.Run(new frmMain());
  }

  private void btnUpload_Click(object sender, System.EventArgs e)
  {
   try
   {
    //用文件的路径信息创建一个文件对象
    FileInfo MyPicture=new FileInfo(this.txtFilePath.Text);
    //检查文件的存在性
    if(!MyPicture.Exists)
    {
     MessageBox.Show("文件不存在!");
    }
    else
    {
     //检查文件的扩展名,如果不符合要求就返回
     switch(MyPicture.Extension.ToUpper())
     {
      case ".JPG":this.UpLoadImageFile(MyPicture);break;
      case ".GIF":this.UpLoadImageFile(MyPicture);break;
      case ".BMP":this.UpLoadImageFile(MyPicture);break;
      default:MessageBox.Show("文件类型不正确!");break;
     }
    }
   }
   catch
   {
    MessageBox.Show("文件路径信息不正确!");
   }
  }

  /// <summary>
  /// 向数据库写入图像文件
  /// </summary>
  private void UpLoadImageFile(FileInfo obj)
  {
   try
   {
    //创建一字节数组,用来存储图像文件.(数组的长度是图像文件的长度)

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