.net MVC验证码不能显示是怎么回事
0
悬赏园豆：10
[已解决问题]
解决于 2014-08-19 15:06
验证码不能正常显示出来，不知道是怎么回事，在线等大神帮忙，急啊！
问题补充：
[OutputCache(Duration = 0)]
public ActionResult VCode()
{
string code = ValidateCode.CreateRandomCode(4);
Session["vcode"] = code;
ValidateCode.CreateImage(code);
return View();
}后台代码
最佳答案
0
还是调试一下吧!走一个大概的流程
收获园豆：10
调试的时候也能获取到验证码的值，就是显示不出来
@孤独狂少: 你没给出后台action的生成验证码的代码,最后有没有指定images文件输出呀
public ActionResult GetValidateCode() { byte[] bytes = validateCode.CreateValidateGraphic(checkCode); return File(bytes, @"image/jpeg"); //这里 }
@秋壶冰月:
//graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码
//生成图片
System.IO.MemoryStream ms = new System.IO.MemoryStream();
map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
graph.Dispose();
map.Dispose();类里面我写了哦！这里有问题吗
@秋壶冰月: 我用数组来接收他报错了无法将void转换为byte
@孤独狂少: mvc中 用将生成的图片保存到MemoryStream中,return ms.ToArray(),在用File() 就可以
@秋壶冰月: 已经可以显示出来了，但是验证码重复了，密密麻麻的全部都是哦！最后这一个问题啦！大哥再帮帮忙呀！
@孤独狂少: 验证码重复,你调试在那里执行多次,你到现在都没有整个代码放出来,不知道在出错了!
@秋壶冰月:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
namespace Utility
{
/// <summary>
/// 完美随机验证码 0.10
/// Verion:0.10
/// Description:随机生成设定验证码，并随机旋转一定角度，字体颜色不同
/// </summary>
public class ValidateCode
{
/// <summary>
/// 生成随机码
/// </summary>
/// <param name="length">随机码个数www.52mvc.com</param>
/// <returns></returns>
public static string CreateRandomCode(int length)
{
int rand;
char code;
string randomcode = String.Empty;
//生成一定长度的验证码
System.Random random = new Random();
for (int i = 0; i < length; i++)
{
rand = random.Next();
if (rand % 3 == 0)
{
code = (char)('A' + (char)(rand % 26));
}
else
{
code = (char)('0' + (char)(rand % 10));
}
randomcode += code.ToString();
}
return randomcode;
}
/// <summary>
/// 创建随机码图片
/// </summary>
/// <param name="randomcode">随机码</param>
public static byte[] CreateImage(string randomcode)
{
int randAngle = 45; //随机转动角度
int mapwidth = (int)(randomcode.Length * 23);
Bitmap map = new Bitmap(mapwidth, 28);//创建图片背景
Graphics graph = Graphics.FromImage(map);
graph.Clear(Color.AliceBlue);//清除画面，填充背景
graph.DrawRectangle(new Pen(Color.Gray, 0), 0, 0, map.Width - 1, map.Height - 1);//画一个边框
//graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式
Random rand = new Random();
//背景噪点生成 www.2cto.com
Pen blackPen = new Pen(Color.LightGray, 0);
for (int i = 0; i < 50; i++)
{
int x = rand.Next(0, map.Width);
int y = rand.Next(0, map.Height);
graph.DrawRectangle(blackPen, x, y, 1, 1);
}
//验证码旋转，防止机器识别
char[] chars = randomcode.ToCharArray();//拆散字符串成单字符数组
//文字距中
StringFormat format = new StringFormat(StringFormatFlags.NoClip);
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
for (int i = 0; i < chars.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);
Font f = new System.Drawing.Font(font[findex], 13, System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)
Brush b = new System.Drawing.SolidBrush(c[cindex]);
Point dot = new Point(16, 16);
//graph.DrawString(dot.X.ToString(),fontstyle,new SolidBrush(Color.Black),10,150);//测试X坐标显示间距的
float angle = rand.Next(-randAngle, randAngle);//转动的度数
graph.TranslateTransform(dot.X, dot.Y);//移动光标到指定位置
graph.RotateTransform(angle);
graph.DrawString(chars.ToString(), f, b, 1, 1, format);
//graph.DrawString(chars.ToString(),fontstyle,new SolidBrush(Color.Blue),1,1,format);
graph.RotateTransform(-angle);//转回去
graph.TranslateTransform(2, -dot.Y);//移动光标到指定位置
}
//graph.DrawString(randomcode,fontstyle,new SolidBrush(Color.Blue),2,2); //标准随机码
//生成图片
System.IO.MemoryStream ms = new System.IO.MemoryStream();
map.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/jpeg";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
graph.Dispose();
map.Dispose();
return ms.ToArray();
}
}
}
@孤独狂少: 生成的验证码,内容重复,我刚才调了一下,没解决,对要求不高的话,先用我以前收藏的吧
public static byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); Graphics g = Graphics.FromImage(image); try { //生成随机生成器 Random random = new Random(); //清空图片背景色 g.Clear(Color.White); //画图片的干扰线 for (int i = 0; i < 25; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); } Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true); g.DrawString(validateCode, font, brush, 3, 2); //画图片的前景干扰点 for (int i = 0; i < 100; i++) { int x = random.Next(image.Width); int y = random.Next(image.Height); image.SetPixel(x, y, Color.FromArgb(random.Next())); } //画图片的边框线 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); //保存图片数据 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //输出图片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } }
@秋壶冰月: 好的实在太谢谢了
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