/// <summary>
/// 输出验证码
/// </summary>
/// <param name="checkCode"></param>
public static byte[] CreateImage(string checkCode)
{
int iwidth = (int)(checkCode.Length * 15);
System.DrawingCore.Bitmap image = new System.DrawingCore.Bitmap(iwidth, 20);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(image);
g.Clear(System.DrawingCore.Color.White);
//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = { "Times New Roman", "Microsoft Sans Serif", "MS Mincho", "Book Antiqua", "PMingLiU" };
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.LightGray, 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 Font(font[findex], 10, FontStyle.Bold);
Brush b = new SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), f, b, 3 + (i * 14), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.DrawingCore.Imaging.ImageFormat.Jpeg);
byte[] buffer = ms.ToArray();
g.Dispose();
image.Dispose();
return(buffer);
}
/// <summary>
/// 生成图片缩略图
/// </summary>
/// <param name="sourcePath">图片路径</param>
/// <param name="newPath">新图片路径</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
public static void MakeThumbnail(string sourcePath, string newPath, int width, int height)
{
System.DrawingCore.Image ig = System.DrawingCore.Image.FromFile(sourcePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = ig.Width;
int oh = ig.Height;
if ((double)ig.Width / (double)ig.Height > (double)towidth / (double)toheight)
{
oh = ig.Height;
ow = ig.Height * towidth / toheight;
y = 0;
x = (ig.Width - ow) / 2;
}
else
{
ow = ig.Width;
oh = ig.Width * height / towidth;
x = 0;
y = (ig.Height - oh) / 2;
}
System.DrawingCore.Image bitmap = new System.DrawingCore.Bitmap(towidth, toheight);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap);
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(System.DrawingCore.Color.Transparent);
g.DrawImage(ig, new System.DrawingCore.Rectangle(0, 0, towidth, toheight), new System.DrawingCore.Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);
try
{
bitmap.Save(newPath, System.DrawingCore.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex)
{
throw ex;
}
finally
{
ig.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
