有时候我们需要获得网页上的图片,尤其是向验证码这样的图片.这个方法就是将网页上的图片获取到PictureBox中.效果入下图所示.
![](https://images.cnblogs.com/cnblogs_com/hobe/3.14.JPG)
右边是使用Webbrowser控件装载的某网站的注册页面,其中包括了验证码.左边是获取到的验证码,装载在PictureBox中.也许有人会问,通过Webbrowser也能够看到注册页面的验证码为什么还要,在获得这个验证码.原因如下:当你不想让别人知道在做什么的时候需要使用,别人只能看到注册码而不知道在干什么事情;另外愿意是为了方便,当做这个一个注册程序的时候,注册信息一般都是自动生成的,但是验证码需要输入,不停的拖动滚动条找注册码的位置不方便.
下面看看如何实现.
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;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
rang.add(Img);
rang.execCommand("Copy", false, null);
Image RegImg = Clipboard.GetImage();
Clipboard.Clear();
return RegImg;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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;
}
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
右边是使用Webbrowser控件装载的某网站的注册页面,其中包括了验证码.左边是获取到的验证码,装载在PictureBox中.也许有人会问,通过Webbrowser也能够看到注册页面的验证码为什么还要,在获得这个验证码.原因如下:当你不想让别人知道在做什么的时候需要使用,别人只能看到注册码而不知道在干什么事情;另外愿意是为了方便,当做这个一个注册程序的时候,注册信息一般都是自动生成的,但是验证码需要输入,不停的拖动滚动条找注册码的位置不方便.
下面看看如何实现.
首先需要添加mshtml的引用,之后using mshtml;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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