public class CreateImage
{
public static void DrawImage()
{
CreateImage img = new CreateImage();
HttpContext.Current.Session["CheckCode"] = img.RndNum(5);
img.CreateImages(HttpContext.Current.Session["CheckCode"].ToString());
}
private void CreateImages(string checkCode)
{
int iwidth = (int)(checkCode.Length * 20);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 23);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.White);
//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"};
Random rand = new Random();
//随机输出噪点
for(int i=0;i<50;i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightBlue, 0),x,y,1,1);
}
//输出不同字体和颜色的验证码字符
for(int i=0;i<checkCode.Length;i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);
Font f = new System.Drawing.Font(font[findex], 10, System.Drawing.FontStyle.Bold);
Brush b = new System.Drawing.SolidBrush(c[cindex]);
int ii=4;
if((i+1)%2==0)
{
ii=2;
}
g.DrawString(checkCode.Substring(i,1), f, b, 3+(i*12), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black,0),1,1,image.Width-1+100,image.Height-1+100);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream(100);
image.Save(ms,System.Drawing.Imaging.ImageFormat.Jpeg);
HttpContext.Current.Response.ClearContent();
//Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Jpeg";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
///
/// 生成随机的字母
///
/// 生成字母的个数
/// string
private string RndNum(int VcodeNum)
{
string Vchar = "0,1,2,3,4,5,6,7,8,9";
string[] VcArray = Vchar.Split(',');
string VNum = ""; //由于字符串很短,就不用StringBuilder了
int temp = -1; //记录上次随机数值,尽量避免生产几个一样的随机数
//采用一个简单的算法以保证生成随机数的不同
Random rand = new Random();
for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
}
int t = rand.Next(VcArray.Length);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
上面是生成动态验证码的类,在页面的cs文件调用这个类,只是显示动态验证码的图片,加不上其它的控件,还有动态验证码的位置没法改变,哪位大侠指点一下。在页面加入入一个文本框。调整一下验证码图片的位置
------解决方案--------------------------------------------------------
把这个类,作为VerifyCode.aspx的后台代码。
页面直接用URL调用。
如
- HTML code
<img align="top" id="imgVerify" src='VerifyCode.aspx' alt="看不清?点击更换" onclick="src='VerifyCode.aspx?'+Math.random();" />
------解决方案--------------------------------------------------------
像1楼说的那样,放进去,然后另一页直接引用。