验证码改字体大小和大小写

乞一世 2011-06-20 08:41:05

protected void Page_Load(object sender, EventArgs e)
{
string[] str = new string[4];
string serverCode = "";
string[] a = new string[61] { "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" };
//生成随机生成器
Random random = new Random();
for (int i = 0; i < 4; i++)
{
int rd = random.Next(60);
str[i] = a[rd];
}
CreateCheckCodeImage(str);
foreach (string s in str)
{
serverCode += s;
}
Session["serverCode"] = serverCode;
}
public void CreateCheckCodeImage(string[] checkCode)
{
if (checkCode == null || checkCode.Length <= 0)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 30);
System.Drawing.Graphics g = Graphics.FromImage(image);
try
{
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 < 20; 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);
}
//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[] f = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
for (int k = 0; k <= checkCode.Length - 1; k++)
{
int cindex = random.Next(7);
int findex = random.Next(5);
Font drawFont = new Font(f[findex], 16, (System.Drawing.FontStyle.Bold));
SolidBrush drawBrush = new SolidBrush(c[cindex]);
float x = 5.0F;
float y = 0.0F;
float width = 20.0F;
float height = 25.0F;
int sjx = random.Next(10);
int sjy = random.Next(image.Height - (int)height);
RectangleF drawRect = new RectangleF(x + sjx + (k * 25), y + sjy, width, height);
StringFormat drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Center;
g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat);
}
//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);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
这是我在网上下的一段验证码，想把字体改大些，并且这个好像是分大小写的，哪位大神给教下改哪呢

...全文