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Retrieving images from MS SQL databse

6 New Member
Hi,

Im using a MS SQL server to store images... Im creating a windows form application using C#.

I need to store and retrieve images from the database.

This is my code to store images:

Expand|Select|Wrap|Line Numbers
  1.              pictureBox.Image = new  System.Drawing.Bitmap(this.openFileDialog.FileName);
  2.              MemoryStream mstr = new MemoryStream();
  3.              pictureBox.Image.Save(mstr, pictureBox.Image.RawFormat);
  4.              byte[] arrImage = mstr.GetBuffer();
  5.              Console.WriteLine("----------"+arrImage.ToString()+"--------------");
  6.  
  7.             string connString = SatSmart.Misc.DataConn.connString;
  8.             string qry = "update " + this.screenObject.loggedInUserType + "s set photo='@Pic' where userName='" + this.screenObject.loggedInUserName + "';";
  9.             System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection(connString);
  10.             System.Data.Odbc.OdbcCommand cmd = new System.Data.Odbc.OdbcCommand(qry, conn);
  11.             System.Data.Odbc.OdbcParameter param=new System.Data.Odbc.OdbcParameter("@Pic",System.Data.Odbc.OdbcType.Image);
  12.             param.Value = arrImage;
  13.             cmd.Parameters.Add(param);
  14.             conn.Open();
  15.             cmd.ExecuteNonQuery();
  16.             conn.Close();
This loading image code works fine...

Here is my code for retrieving images:

Expand|Select|Wrap|Line Numbers
  1. while (reader.Read())
  2.             {
  3.  
  4.                 byte[] image = (byte[])reader.GetValue(reader.GetOrdinal("photo"));
  5.                 System.Drawing.Image newImage = null;
  6.                 using (System.IO.MemoryStream stream = new System.IO.MemoryStream(image))
  7.                 {
  8.                     try
  9.                     {
  10.                         newImage = System.Drawing.Image.FromStream(stream);
  11.                     }
  12.                     catch (Exception e)
  13.                     {
  14.                         System.Windows.Forms.MessageBox.Show(e.ToString());
  15.                     }
  16.                 }
  17.                 this.pictureBox.Image = newImage;
  18.             }
  19.  
this code doesnt work.Im getiing a exception...
The Exception stack trace is....
A first chance exception of type 'System.Argumen tException' occurred in System.Drawing. dll
at System.Drawing. Image.FromStrea m(Stream stream, Boolean useEmbeddedColo rManagement, Boolean validateImageDa ta)
at System.Drawing. Image.FromStrea m(Stream stream)
at SatSmart.Teache rGUI.MyAccountU serControl..cto r(screen screen) in C:\Documents and Settings\san.ba k\Desktop\SatSm art\SatSmart\Te acherGUI\MyAcco untUserControl. cs:line 94

Its a "System.Argumen tException:Para meter is not valid"

Plz help... Im really stuck in this.....
Dec 15 '07 #1
1 2448
san123456789
6 New Member
I got it finally...

Here are the code snippets....

To upload image:

Expand|Select|Wrap|Line Numbers
  1. MemoryStream mstr = new MemoryStream();
  2.                 pictureBox.Image.Save(mstr, pictureBox.Image.RawFormat);
  3.                 byte[] picbyte = mstr.GetBuffer();
  4.                 conn.Open ();
  5.                 string qry = "INSERT INTO images(imageData) values(?)";
  6.                 System.Data.Odbc.OdbcCommand cmd= new System.Data.Odbc.OdbcCommand(qry, conn);
  7.                 cmd.Parameters.AddWithValue("@Picture", System.Data.Odbc.OdbcType.Image);
  8.                 cmd.Parameters["@Picture"].Value = picbyte;
  9.                 cmd.ExecuteNonQuery();
  10.  
To download image:

Expand|Select|Wrap|Line Numbers
  1. string qry="select imageData from images where imageId=?";
  2.                 System.Data.Odbc.OdbcCommand cmd= new System.Data.Odbc.OdbcCommand(qry, conn);
  3.                 cmd.Parameters.Add("@ID", System.Data.Odbc.OdbcType.Int, 4);
  4.                 cmd.Parameters["@ID"].Value = reader.GetInt32(reader.GetOrdinal("imageId"));
  5.                 conn.Open();
  6.                 byte[] barrImg=(byte[])cmd.ExecuteScalar();
  7.                 string strfn=Convert.ToString(DateTime.Now.ToFileTime());
  8.                 FileStream fs=new FileStream(strfn, 
  9.                                   FileMode.CreateNew, FileAccess.Write);
  10.                 fs.Write(barrImg,0,barrImg.Length);
  11.                 fs.Flush();
  12.                 fs.Close();
  13.                 this.pictureBox.Image = Image.FromFile(strfn);
  14.  
Dec 15 '07 #2

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