public partial class ValidateImage : System.Web.UI.Page
{
Random rdm = new Random(unchecked((int)DateTime.Now.Ticks));
protected void Page_Load(object sender, EventArgs e)
{
// 在此处放置用户代码以初始化页面
MemoryStream My_Stream = new MemoryStream();
My_Stream = Get_Images(11, 4, "#ffffff");
Show_image(My_Stream);
My_Stream.Close();
}
private MemoryStream Get_Images(int Font_Size, int Char_Number, string BackgroundColor)
{
int image_w = Convert.ToInt32(Font_Size * 1.3) + Font_Size * Char_Number;
int image_h = Convert.ToInt32(1.8 * Font_Size);
Bitmap Temp_Bitmap;//'封装GDI+位图
Graphics Temp_Graphics;//封装GDI+绘图面
Color Color_Back = ColorTranslator.FromHtml(BackgroundColor);//'背景颜色
Temp_Bitmap = new Bitmap(image_w, image_h, PixelFormat.Format32bppRgb);//注意注 确定背景大小
Temp_Graphics = Graphics.FromImage(Temp_Bitmap);
Temp_Graphics.FillRectangle(new SolidBrush(Color_Back), new Rectangle(0, 0, image_w, image_h));//注意注 绘制背景
string Sesson_Company = "";//为了进行验证比较
for (int n = 0; n < Char_Number; n++)
{
string Show_Str = getChar();//要显示为图像的字符
Sesson_Company = Sesson_Company + Show_Str;
// int Show_Str_Font_Size = Convert.ToInt32(3 * rdm.NextDouble()+(Font_Size-1));//'字体随机大小 下波动1
int Show_Str_Font_Size = Convert.ToInt32(Font_Size);
Color Color_Font = ColorTranslator.FromHtml(getColor());//'字体随机颜色
string Show_Font_Name = getFont();//'字体
Font Show_Str_Font = new Font(Show_Font_Name, Show_Str_Font_Size, FontStyle.Bold);//'定义文本格式（字体，字号,粗体）
Temp_Graphics.DrawString(Show_Str, Show_Str_Font, new SolidBrush(Color_Font), Convert.ToInt32(Font_Size / 2) + n * Font_Size, Convert.ToInt32(image_h * 0.125));//'绘出字符 '绘字符的Y方向下波动＋4
}
//保存到Session
//Session.Clear();
Session["ImageNumber"] = Sesson_Company.Trim();
Session["yzm"] = Sesson_Company.Trim();
MemoryStream Temp_Stream = new MemoryStream();
Temp_Bitmap.Save(Temp_Stream, ImageFormat.Jpeg);
Temp_Graphics.Dispose();//'释放资源
Temp_Bitmap.Dispose();//'释放资源
Temp_Stream.Close();//'关闭打开的流文件
return Temp_Stream;//'返回流
}
private void Show_image(MemoryStream Show_Stream)//'显示内存图像
{
Response.ClearContent();
Response.ContentType = "Image/Jpeg";
Response.BinaryWrite(Show_Stream.ToArray());
Response.End();
}
private string getChar()//'获得随机字符 1-9 a-z A-Z
{
char[] Char_array = new char[5];
Char_array[0] = Convert.ToChar(rdm.Next(9) + 49);
// Char_array[1] = Convert.ToChar(rdm.Next(26)+65);
// Char_array[2] = Convert.ToChar(rdm.Next(26)+65);
// Char_array[3] = Convert.ToChar(rdm.Next(26)+65);
Char_array[1] = Convert.ToChar(rdm.Next(9) + 49);
Char_array[2] = Convert.ToChar(rdm.Next(9) + 49);
Char_array[3] = Convert.ToChar(rdm.Next(9) + 49);
Char_array[4] = Convert.ToChar(rdm.Next(9) + 49);
//Char_array[4] = Convert.ToChar(rdm.Next(26)+97);
//return Char_array[Convert.ToInt32(5 * rdm.NextDouble())];
//return Char_array[Convert.ToInt32(rdm.Next(4))];
return Char_array[Convert.ToInt32(rdm.Next(4))].ToString();
}
private string getColor()//'获得随机颜色
{
int int_a, int_b, int_c;
int_a = Convert.ToInt32(180 * rdm.NextDouble() + 20);
int_b = Convert.ToInt32(180 * rdm.NextDouble() + 20);
int_c = Convert.ToInt32(180 * rdm.NextDouble() + 20);
if (int_a > 150 && int_b > 150 && int_c > 150) int_a = Convert.ToInt32(150 * rdm.NextDouble() + 20);
return "#" + Convert.ToString(int_a, 16) + Convert.ToString(int_b, 16) + Convert.ToString(int_c, 16);
}
private string getFont()//'获得随机字体
{
return "Fixedsys";
}
private string getFont1()//'获得随机字体
{
return "宋体";
}
}