一个简单的WebSerivce传递图片的例子

一个简单的WebSerivce传递图片的例子.

WebService中实现了一个方法GetImage(),在内存中生成一张100x100的Bitmap.然后在该Bitmap上画一条线,

再将这个图片转换为byte[]传递给调用者.调用的程式将该byte[]还原为Bitmap.

以下是代码:

WebService:

C# code

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Services;using System.IO;using System.Drawing;using System.Drawing.Imaging;namespace WebService{    /// <summary>    ///MyWebService 的摘要描述    /// </summary>    [WebService(Namespace = "http://tempuri.org/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]    [System.ComponentModel.ToolboxItem(false)]    // 若要允許使用 ASP.NET AJAX 從指令碼呼叫此 Web 服務，請取消註解下一行。    // [System.Web.Script.Services.ScriptService]    public class MyWebService : System.Web.Services.WebService    {        [WebMethod]        public byte[] GetImage()        {            //生成BitMap            byte[] ret = null;            Bitmap bm = new Bitmap(100, 100);            for (int i = 0; i < 100; i++)            {                bm.SetPixel(i, i, Color.Blue);            }            //从内存中读取出来存放到返回结果中        MemoryStream ms = new MemoryStream();            ImageCodecInfo[] inf = ImageCodecInfo.GetImageEncoders();            EncoderParameters eps = new EncoderParameters(1);            Encoder ec = System.Drawing.Imaging.Encoder.ColorDepth;            EncoderParameter ep = new EncoderParameter(ec, 80);            eps.Param[0] = ep;            bm.Save(ms, inf.First(info => info.MimeType == "image/bmp"), eps);            ret = new byte[ms.Length];            ret = ms.ToArray();            return ret;        }    }}

调用端是Winform,一个PictureBox,一个Button:

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.IO;namespace WinForm{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            MyWebService.MyWebService ws = new MyWebService.MyWebService();            byte[] b = ws.GetImage();            Bitmap bm = new Bitmap(new MemoryStream(b));            pictureBox1.Image = bm;        }    }}