完全copy的网上的代码,总不显示图片,也不报错,感觉没有调用checkcode.ashx。
将随机数用常量测试,也一样
将图片用现成的图片测试,也一样
路径都调整在根目录下了调用页login.aspx中
<img src="checkcode.ashx" alt="nothing" width="100px" height="100px" />处理页中
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string code = GenerateCheckCode();
context.Session["code"] = code;
this.CreateCheckCodeImage(code, context);
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < 4; i++)
{
number = random.Next(); if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26)); checkCode += code.ToString();
}
return checkCode;
} private void CreateCheckCodeImage(string checkCode, HttpContext context)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 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); //画图片的背景噪音线
for (int i = 0; i < 5; 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 System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2); //画图片的前景噪音点
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); System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
context.Response.ClearContent();
context.Response.ContentType = "image/Gif";
context.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
public bool IsReusable
{
get
{
return false;
}
}
将随机数用常量测试,也一样
将图片用现成的图片测试,也一样
路径都调整在根目录下了调用页login.aspx中
<img src="checkcode.ashx" alt="nothing" width="100px" height="100px" />处理页中
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string code = GenerateCheckCode();
context.Session["code"] = code;
this.CreateCheckCodeImage(code, context);
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty; System.Random random = new Random(); for (int i = 0; i < 4; i++)
{
number = random.Next(); if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26)); checkCode += code.ToString();
}
return checkCode;
} private void CreateCheckCodeImage(string checkCode, HttpContext context)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return; System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 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); //画图片的背景噪音线
for (int i = 0; i < 5; 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 System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2); //画图片的前景噪音点
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); System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
context.Response.ClearContent();
context.Response.ContentType = "image/Gif";
context.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
public bool IsReusable
{
get
{
return false;
}
}
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--------------------------------------------------------------------------------名称以无效字符开头。处理资源 'file:///D:/ptb00/ptb00/checkcode.ashx' 时出错。第 1 行,位置: 2 <%@ WebHandler Language="C#" Class="checkcode" %>
-^