vb Web控件上获取图片
酬谢:300分(决不食言)
声明:要钱的哪边凉快哪边去
本人随时在线 VB 和VB.net都可以,只要达到效果 注意 不能用截图
二楼的 ,麻烦看清楚问题 我不是要制作验证码 我是要识别别人的验证码(这个识别的我早就写好了,用的就是截图获取图片,然后判断字符)现在我要的就是直接获取那个图片
最新回答
时间曼妙
2024-10-23 04:27:58
On Error Resume Next
Dim x, CtrlRange
For Each x In WebBrowser1.Document.getelementsbytagname("IMG")
If x.src = "[验证码图片完整网址（带http://）]" Then
Set CtrlRange = WebBrowser1.Document.body.createControlRange()
CtrlRange.Add (x)
CtrlRange.execCommand ("Copy") '相当于点图片右键菜单上的“复制”
SavePicture Clipboard.GetData, App.Path & "regcode.bmp"
End If
Next
End Sub
让月色乏味
2024-10-23 03:09:08
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing.Text;
using System.Drawing;
using System.Text;
public partial class png : System.Web.UI.Page
{
private readonly string ImagePath = "Validator.jpg";
private static string gif = "";
protected void Page_Load(object sender, EventArgs e)
{
switch (Request.QueryString["aa"])
{
case "1":
gif = stxt();
Session["gif"]= stxt();
break;
case "2":
gif = GetRandomint();
Session["gif"]= GetRandomint();
break;
case "3":
gif = RndNum(3);
Session["gif"]= RndNum(3);
break;
default:
gif = RndNum(3);
Session["gif"]= GetRandomint();
break;
}
/**////创建Bmp位图
Bitmap bitMapImage = new System.Drawing.Bitmap(Server.MapPath(ImagePath));
Graphics graphicImage = Graphics.FromImage(bitMapImage);
/**////设置画笔的输出模式
graphicImage.SmoothingMode = SmoothingMode.HighSpeed;
/**////添加文本字符串
graphicImage.DrawString(gif, new Font("Arial", 20, FontStyle.Bold), SystemBrushes.WindowText, new Point(0, 0));
/**////设置图像输出的格式
Response.ContentType = "image/jpeg";
/**////保存数据流
bitMapImage.Save(Response.OutputStream, ImageFormat.Jpeg);
/**////释放占用的资源
graphicImage.Dispose();
bitMapImage.Dispose();
}
返回纯数字
private String GetRandomint()
{
Random random = new Random();
return (random.Next(100000, 999999).ToString());
}
返回文字＼数字＼字母混合的
public static String RndNum(int VcodeNum)
{
String Vchar = "0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,W,X,Y,Z,呵,哈,弹,簧,秤,嬉,戏";
String[] VcArray = Vchar.Split(',');
String VNum = "";
Random random = new Random();
for (int i = 1; i <= VcodeNum; i++)
{
int iNum = 0;
while ((iNum = Convert.ToInt32(VcArray.Length * random.NextDouble())) ==VcArray.Length )
{
iNum = Convert.ToInt32(VcArray.Length * random.NextDouble());
}
VNum += VcArray[iNum];
// VNum += VcArray[Convert.ToInt32(VcArray.Length*random.NextDouble())];
}
return VNum;
}
返回汉字的
public static object[] CreateRegionCode(int strlength)
{
//定义一个字符串数组储存汉字编码的组成元素
string[] rBase=new String [16]{"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
Random rnd=new Random();
//定义一个object数组用来
object[] bytes=new object[strlength];
/**//**//**//*每循环一次产生一个含两个元素的十六进制字节数组，并将其放入bject数组中
每个汉字有四个区位码组成
区位码第1位和区位码第2位作为字节数组第一个元素
区位码第3位和区位码第4位作为字节数组第二个元素
*/
for(int i=0;i<strlength;i++)
{
//区位码第1位
int r1=rnd.Next(11,14);
string str_r1=rBase[r1].Trim();
//区位码第2位
rnd=new Random(r1*unchecked((int)DateTime.Now.Ticks)+i);//更换随机数发生器的种子避免产生重复值
int r2;
if (r1==13)
{
r2=rnd.Next(0,7);
}
else
{
r2=rnd.Next(0,16);
}
string str_r2=rBase[r2].Trim();
//区位码第3位
rnd=new Random(r2*unchecked((int)DateTime.Now.Ticks)+i);
int r3=rnd.Next(10,16);
string str_r3=rBase[r3].Trim();
//区位码第4位
rnd=new Random(r3*unchecked((int)DateTime.Now.Ticks)+i);
int r4;
if (r3==10)
{
r4=rnd.Next(1,16);
}
else if (r3==15)
{
r4=rnd.Next(0,15);
}
else
{
r4=rnd.Next(0,16);
}
string str_r4=rBase[r4].Trim();
//定义两个字节变量存储产生的随机汉字区位码
byte byte1=Convert.ToByte(str_r1 + str_r2,16);
byte byte2=Convert.ToByte(str_r3 + str_r4,16);
//将两个字节变量存储在字节数组中
byte[] str_r=new byte[]{byte1,byte2};
//将产生的一个汉字的字节数组放入object数组中
bytes.SetValue(str_r,i);
}
return bytes;
}
private string stxt()
{
Encoding gb = Encoding.GetEncoding("gb2312");
//调用函数产生4个随机中文汉字编码
object[] bytes = CreateRegionCode(3);
//根据汉字编码的字节数组解码出中文汉字
string str1 = gb.GetString((byte[])Convert.ChangeType(bytes[0], typeof(byte[])));
string str2 = gb.GetString((byte[])Convert.ChangeType(bytes[1], typeof(byte[])));
string str3 = gb.GetString((byte[])Convert.ChangeType(bytes[2], typeof(byte[])));
string txt = str1 + str2 + str3;
return txt;
}
我们调用页的代码如下
HTML代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="view.aspx.cs" Inherits="view" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd
"><html xmlns="
http://www.w3.org/1999/xhtml
" ><head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Image ID="Image1" runat="server" ImageUrl="png.aspx" /><br />
<br />
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Value="3">默认</asp:ListItem>
<asp:ListItem Value="1">文字</asp:ListItem>
<asp:ListItem Value="2">数字</asp:ListItem>
<asp:ListItem Value="3">混合</asp:ListItem>
</asp:DropDownList></div>
</form>
</body>
</html>
CS代码
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (DropDownList1.SelectedValue)
{
case "1":
Image1.ImageUrl = "png.aspx?aa=1";
break;
case "2":
Image1.ImageUrl = "png.aspx?aa=2";
break;
case "3":
Image1.ImageUrl = "png.aspx?aa=3";
break;
}
}
protected void Button2_Click(object sender, EventArgs e)
{
if (TextBox1.Text == Session["gif"].ToString())
Response.Write("OK,正确");
else
Response.Write("验证码不符合");
}
热门标签
