as2+.net上传图片截图

这随笔记录flash actionscript2 实现截取一张载图并上传的.net服务器。

 

flash 代码

1.引用

import flash.display.BitmapData;
import flash.geom.Rectangle;

2.创建截图

var bmpScreen:BitmapData = new BitmapData(_root._width,_root._height);
bmpScreen.draw(_root);  //我这里将整个屏画到BitmapData
//矩形为要截取区域
var imgWidth = 300;
var imgHeight = 200;
var bmpScreencap:BitmapData=new BitmapData(imgWidth,imgHeight);
bmpScreencap.copyPixels(bmpScreen,new Rectangle(40,40,imgWidth,imgHeight),new Point(0,0));

3. 将截图转为十六进制的颜色编码（hex-code）

var xPixel=0;
var yPixel=0;
var pointColor=0;
var newFxiedPointColor=0;
var mpluses=0;
var strBytesString=new String();
for(xPixel =0; xPixel < imgWidth; xPixel ++){
    for(yPixel =0; yPixel < imgHeight; yPixel ++){
    pointColor = bmpScreencap.getPixel(xPixel, yPixel).toString(16);//获取每个象素的Hex值
    newFxiedPointColor =pointColor ; 
        for (mpluses=0;mpluses < 6 - pointColor.length;mpluses++){
            newFxiedPointColor="0" + newFxiedPointColor;  //不足6位要补足
        }
        strBytesString += newFxiedPointColor +  ","; //我这里用逗号分隔每个象素的颜色值
    };
};

4.上传到服务器

var lvDataSender:LoadVars = new LoadVars(); 
//设置上传参数
lvDataSender.imgwidth=imgWidth;      //截图宽度
lvDataSender.imgheight=imgHeight;   //载图高度
lvDataSender.imgrgb= strBytesString; //截图的Hex字符串
lvDataSender.imgurl=""; //定义接收参数
lvDataSender.sendAndLoad(“你服务器的api地址”, lvDataSender,  "POST");
lvDataSender.onLoad = function(success:Boolean) {
if (success) { 
     ExternalInterface.call("saveImage",lvDataSender.imgurl); //成功后，处理你的逻辑，我这里调用外部javascript的saveImage方法
     } else {
          trace("ops :S"); // 失败
     };
};

.net(C#)代码

1.后台服务影响，我这里用ashx文件

/// <summary>
/// 上传并保存图片
/// </summary>
public class Upload : IHttpHandler,IRequiresSessionState 
{
    public void ProcessRequest(HttpContext context)
    {
        string result = string.Empty;
        //获取参数
        int imgWidth = int.Parse(context.Request.Form["imgwidth"].ToString());
        int imgHeight = int.Parse(context.Request.Form["imgheight"].ToString());
        string imgRGB = context.Request.Form["imgrgb"];
        string[] strRgb = imgRGB.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

        using(Bitmap bitmap = CreateBitmap(imgWidth, imgHeight, strRgb))
        {
            //保存图片
            bitmap.Save(保存路径)
            result = "" //设置反回值;                  
        }
        context.Response.ContentType = "text/plain";
        context.Response.Write("imgurl="+result);
    }

    /// <summary>
    /// 创建bitmap
    /// </summary>
    /// <param name="width">宽度</param>
    /// <param name="height">高度</param>
    /// <param name="rgb">rgb数组</param>
    /// <returns></returns>
    private Bitmap CreateBitmap(int width,int height,string[] rgb) 
    {
        Bitmap bitmap = new Bitmap(width,height);
        int index = 0;
        for (int x = 0; x < width; x++) 
        {
            for (int y = 0; y < height; y++) {
                string s = rgb[index];
                int r=Convert.ToInt32(s.Substring(0,2),16);
                int g = Convert.ToInt32(s.Substring(2, 2), 16);
                int b = Convert.ToInt32(s.Substring(4, 2), 16);

                bitmap.SetPixel(x, y, Color.FromArgb(r,g,b));
                index++;
            }
        }
        return bitmap;
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

参考：Send And Upload Binary Bytes or Image from Flash with ActionScript+2.0