c#生成验证码程序
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;
public partial class inc_validcode : system.web.ui.page
{
protected void page_load(object sender, eventargs e)
{
verifycode v = new verifycode();
v.length = 4;
v.fontsize = 14;
v.chaos = true;
v.backgroundcolor = color.white;
v.chaoscolor = color.lightgray;
//v.codeserial = "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,v,w,x,y,z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
//v.colors = this.colors;``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
//v.fonts = this.fonts;
v.padding = 2;
string code = v.createverifycode(); //取随机码
v.createimageonpage(code, this.context); // 输出图片
//response.cookies.add(new httpcookie("fcvalidtcode", code.toupper()));// 使用cookies取验证码的值
session["bao_code"] = code.toupper();
}
public class verifycode
{
#region 验证码长度(默认6个验证码的长度)#region 验证码长度(默认6个验证码的长度)
int length = 6;
public int length
{
get { return length; }
set { length = value; }
}
#endregion
#region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)#region 验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)
int fontsize = 30;
public int fontsize
{
get { return fontsize; }
set { fontsize = value; }
}
#endregion
#region 边框补(默认1像素)#region 边框补(默认1像素)
int padding = 2;
public int padding
{
get { return padding; }
set { padding = value; }
}
#endregion
#region 是否输出燥点(默认不输出)#region 是否输出燥点(默认不输出)
bool chaos = true;
public bool chaos
{
get { return chaos; }
set { chaos = value; }
}
#endregion
#region 输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
color chaoscolor = color.lightgray;
public color chaoscolor
{
get { return chaoscolor; }
set { chaoscolor = value; }
}
#endregion
#region 自定义背景色(默认白色)#region 自定义背景色(默认白色)
color backgroundcolor = color.white;
public color backgroundcolor
{
get { return backgroundcolor; }
set { backgroundcolor = value; }
}
#endregion
#region 自定义随机颜色数组#region 自定义随机颜色数组
color[] colors = { color.black, color.red, color.darkblue, color.green, color.orange, color.brown, color.darkcyan, color.purple };
public color[] colors
{
get { return colors; }
set { colors = value; }
}
#endregion
#region 自定义字体数组#region 自定义字体数组
string[] fonts = { "arial", "georgia" };
public string[] fonts
{
get { return fonts; }
set { fonts = value; }
}
#endregion
#region 自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)
string codeserial = "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,v,w,x,y,z,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
public string codeserial
{
get { return codeserial; }
set { codeserial = value; }
}
#endregion
#region 产生波形滤镜效果#region 产生波形滤镜效果
private const double pi = 3.1415926535897932384626433832795;
private const double pi2 = 6.283185307179586476925286766559;
/**/
/// <summary>
/// 正弦曲线wave扭曲图片（edit by 51aspx.com）
/// </summary>
/// <param name="srcbmp">图片路径</param>
/// <param name="bxdir">如果扭曲则选择为true</param>
/// <param name="nmultvalue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
/// <param name="dphase">波形的起始相位，取值区间[0-2*pi)</param>
/// <returns></returns>
public system.drawing.bitmap twistimage(bitmap srcbmp, bool bxdir, double dmultvalue, double dphase)
{
system.drawing.bitmap destbmp = new bitmap(srcbmp.width, srcbmp.height);
// 将位图背景填充为白色
system.drawing.graphics graph = system.drawing.graphics.fromimage(destbmp);
graph.fillrectangle(new solidbrush(system.drawing.color.white), 0, 0, destbmp.width, destbmp.height);
graph.dispose();
double dbaseaxislen = bxdir ? (double)destbmp.height : (double)destbmp.width;
for (int i = 0; i < destbmp.width; i++)
{
for (int j = 0; j < destbmp.height; j++)
{
double dx = 0;
dx = bxdir ? (pi2 * (double)j) / dbaseaxislen : (pi2 * (double)i) / dbaseaxislen;
dx += dphase;
double dy = math.sin(dx);
// 取得当前点的颜色
int noldx = 0, noldy = 0;
noldx = bxdir ? i + (int)(dy * dmultvalue) : i;
noldy = bxdir ? j : j + (int)(dy * dmultvalue);
system.drawing.color color = srcbmp.getpixel(i, j);
if (noldx >= 0 && noldx < destbmp.width
&& noldy >= 0 && noldy < destbmp.height)
{
destbmp.setpixel(noldx, noldy, color);
}
}
}
return destbmp;
}
#endregion
#region 生成校验码图片#region 生成校验码图片
public bitmap createimagecode(string code)
{
int fsize = fontsize;
int fwidth = fsize + padding;
int imagewidth = (int)(code.length * fwidth) + 4 + padding * 2;
int imageheight = fsize * 2 + padding;
system.drawing.bitmap image = new system.drawing.bitmap(imagewidth, imageheight);
graphics g = graphics.fromimage(image);
g.clear(backgroundcolor);
random rand = new random();
//给背景添加随机生成的燥点
if (this.chaos)
{
pen pen = new pen(chaoscolor, 0);
int c = length * 10;
for (int i = 0; i < c; i++)
{
int x = rand.next(image.width);
int y = rand.next(image.height);
g.drawrectangle(pen, x, y, 1, 1);
}
}
int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageheight - fontsize - padding * 2);
int n2 = n1 / 4;
top1 = n2;
top2 = n2 * 2;
font f;
brush b;
int cindex, findex;
//随机字体和颜色的验证码字符
for (int i = 0; i < code.length; i++)
{
cindex = rand.next(colors.length - 1);
findex = rand.next(fonts.length - 1);
f = new system.drawing.font(fonts[findex], fsize, system.drawing.fontstyle.bold);
b = new system.drawing.solidbrush(colors[cindex]);
if (i % 2 == 1)
{
top = top2;
}
else
{
top = top1;
}
left = i * fwidth;
g.drawstring(code.substring(i, 1), f, b, left, top);
}
//画一个边框 边框颜色为color.gainsboro
g.drawrectangle(new pen(color.gainsboro, 0), 0, 0, image.width - 1, image.height - 1);
g.dispose();
//产生波形（add by 51aspx.com）
image = twistimage(image, true, 0, 4);
return image;
}
#endregion
#region 将创建好的图片输出到页面#region 将创建好的图片输出到页面
public void createimageonpage(string code, httpcontext context)
{
system.io.memorystream ms = new system.io.memorystream();
bitmap image = this.createimagecode(code);
image.save(ms, system.drawing.imaging.imageformat.jpeg);
context.response.clearcontent();
context.response.contenttype = "image/jpeg";
context.response.binarywrite(ms.getbuffer());
ms.close();
ms = null;
image.dispose();
image = null;
}
#endregion
#region 生成随机字符码#region 生成随机字符码
public string createverifycode(int codelen)
{
if (codelen == 0)
{
codelen = length;
}
string[] arr = codeserial.split(',');
string code = "";
int randvalue = -1;
random rand = new random(unchecked((int)datetime.now.ticks));
for (int i = 0; i < codelen; i++)
{
randvalue = rand.next(0, arr.length - 1);
code += arr[randvalue];
}
return code;
}
public string createverifycode()
{
return createverifycode(0);
}
#endregion
}
}