怎么获取随即生成的验证码图片？并且将图片上的字母或数字获取.
怎么获取随即生成的验证码图片？并且将图片上的字母或数字得到.高难度问题，求高手。
http://passport.csdn.net/ajax/verifyhandler.ashx
https://dynamic.12306.cn/otsweb/passCodeAction.do?rand=lrand
--------------------编程问答-------------------- 首先需要添加mshtml的引用,之后using mshtml;
public static Image GetRegCodePic(WebBrowser wbMail, string ImgName, string Src, string Alt)
{
HTMLDocument doc = (HTMLDocument)wbMail.Document.DomDocument;
HTMLBody body = (HTMLBody)doc.body;
IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();
IHTMLControlElement Img;
if (ImgName == "") //如果没有图片的名字,通过Src或Alt中的关键字来取
{
int ImgNum = GetPicIndex(wbMail, Src,Alt);
if (ImgNum == -1) return null;
Img = (IHTMLControlElement)wbMail.Document.Images[ImgNum].DomElement;
}
else
Img = (IHTMLControlElement)wbMail.Document.All[ImgName].DomElement;
rang.add(Img);
rang.execCommand("Copy", false, null);
Image RegImg = Clipboard.GetImage();
Clipboard.Clear();
return RegImg;
}
public static int GetPicIndex(WebBrowser wbMail, string Src, string Alt)
{
int imgnum = -1;
for (int i = 0; i < wbMail.Document.Images.Count; i++) //获取所有的Image元素
{
IHTMLImgElement img = (IHTMLImgElement)wbMail.Document.Images[i].DomElement;
if (Alt == "")
{
if (img.src.Contains(Src)) return i;
}
else
{
if (!string.IsNullOrEmpty(img.alt))
{
if (img.alt.Contains(Alt)) return i;
}
}
}
return imgnum;
}
}
return imgnum;
}
通过调用GetRegCodePic就可以获得注册码图片了.下面是几个示例.
示例1:
下面是某个站的注册码图片的HTML部分源代码
<IMG height=80 alt="Registration Verification Code" src="......" width=290 border=0>
picturebox1.Image =GetRegCodePic(wbMail, "", "", "Registration Verification Code")
示例2:
下面是某个站的注册码图片的HTML部分源代码
<IMG id=CAPTCHAImage src="......." name=CAPTCHAImage>
picturebox1.Image =GetRegCodePic(wbMail, "CAPTCHAImage", "", "") //通过验证码Html元素的名字来取
补充：.NET技术 , C#
