picturebox加载图片的三种方法与网站验证码的抓取

Posted 2020-10-17

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第一种：（此方法比较笨）

在页面上隐藏几个需要改变页面上图片的picturebox，比如下面的picFrom

在需要改变图片的方法处先定义：

System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));

然后就可以改变了（比如picTo的图片要改变成picFrom的图片）

this.picTo.Image = ((System.Drawing.Image)(resources.GetObject(“picFrom.Image”)));

第二种：

使用 FileStream 对象，如下所示：

Dim fs As System.IO.FileStream ‘ Specify a valid picture file path on your computer. fs = New System.IO.FileStream(“C:/WINNT/Web/Wallpaper/Fly Away.jpg”, IO.FileMode.Open, IO.FileAccess.Read) PictureBox1.Image = System.Drawing.Image.FromStream(fs) fs.Close()

第三种（我认为是比较好的）

使用 Image.FromFile 方法在 PictureBox 控件中加载图片，该图片文件将在您启动应用程序时锁定。

在应用程序运行时，图片文件保持锁定。即使在运行时将 Image 属性设置为 Nothing，图片文件仍将锁定。

PictureBox1.Image = Image.FromFile(“C:/WINNT/Web/Wallpaper/Fly Away.jpg”)

代码如下:

 
 //默认页面请求
 
 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(DefaultUrl);
 
 request.Method = “GET”;
 
 request.ContentType = “application/x-www-form-urlencoded”;
 
 request.UserAgent = “Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1”;
 
 request.Accept = “image/webp,*/*;q=0.8”;
 
 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 
 Stream stream = response.GetResponseStream();
 
 string WebContent = new StreamReader(stream, System.Text.Encoding.UTF8).ReadToEnd();
 
 //验证码请求
 
 request = (HttpWebRequest)WebRequest.Create(CodeUrl);
 
 request.Method = “GET”;
 
 request.ContentType = “application/x-www-form-urlencoded”;
 
 request.UserAgent = “Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1”;
 
 request.Accept = “image/webp,*/*;q=0.8”;
 
 request.CookieContainer = lCC;//!Very Important.!!!
 
 response = (HttpWebResponse)request.GetResponse();
 
 response.Cookies = lCC.GetCookies(request.RequestUri);
 
 stream = response.GetResponseStream();
 
 picCode.Image = Image.FromStream(stream);
 
 //stream.Dispose();