学步园

转载请标明出处以及作者:

http://blog.csdn.net/Lost_Painting/archive/2010/02/10/5305410.aspx

作者:Lost_Painting

   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:
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;
        }
    }
}