A sample code to create webservice to retrieve image from database- The Webservice uses DataReader to read the data from the database table and returns byte array. - The client retrieves the data in form of byte array and saves it in the file with specified format . - The client code uses System.IO.MemoryStream , System.Drawing.Bitmap and System.Drawing.Imaging.ImageFormat namespace to save the image.[bold]Step 1: WebService (WSIMGjpeg.asmx)[/bold]
[WebMethod]
...A sample code to create webservice to retrieve image from database
- The Webservice uses DataReader to read the data from the database table and returns byte array.
- The client retrieves the data in form of byte array and saves it in the file with specified format .
- The client code uses System.IO.MemoryStream , System.Drawing.Bitmap and System.Drawing.Imaging.ImageFormat namespace to save the image.
[bold]Step 1: WebService (WSIMGjpeg.asmx)[/bold]
[code]
[WebMethod]
public byte [] showImage(Int32 empid)
{
SqlConnection myconnection = new SqlConnection ("Server=localhost;uid=sa;password=;database=northwind;");
SqlCommand mycommand = new SqlCommand ("Select Employeeid, FirstName,Photo from Employees where employeeid =" + empid, myconnection);
myconnection.Open ();
SqlDataReader dr= mycommand.ExecuteReader();
dr.Read();
byte[] imgbyte =(byte[]) dr["Photo"];
return imgbyte;
}
[bold]Step 2: Client[/bold]
private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
localhost.WSIMGjpeg obj= new localhost.WSIMGjpeg();
byte[] data = obj.showImage (2);
Int32 offset =78;
System.IO.MemoryStream mstream = new System.IO.MemoryStream ();
mstream.Write(data, offset, data.Length - offset);
System.Drawing.Bitmap bmp= new System.Drawing.Bitmap(mstream);
bmp.Save(Server.MapPath ("empimg.jpeg"), System.Drawing.Imaging.ImageFormat.Jpeg );
mstream.Close();
// Drag and drop <asp:image> tag on webform
Image1.ImageUrl = Server.MapPath("empimg.jpeg");
}
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