刚下载一个验证码的类，帮忙看下怎么用

[Leixian]

研究了半天，不知道怎么在网页上显示~~~
这个 Generate 方法返回的 Image类型怎么可以输出为图片？

using System;
using System.Drawing;

public static class Captcha {
	private static double[] addVector (double[] a, double[] b) {
		return new double[] { a[0] + b[0], a[1] + b[1], a[2] + b[2] };
	}

	private static double[] scalarProduct (double[] vector, double scalar) {
		return new double[] { vector[0] * scalar, vector[1] * scalar, vector[2] * scalar };
	}

	private static double dotProduct (double[] a, double[] b) {
		return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
	}

	private static double norm (double[] vector) {
		return Math.Sqrt(dotProduct(vector, vector));
	}

	private static double[] normalize (double[] vector) {
		return scalarProduct(vector, 1.0 / norm(vector));
	}

	private static double[] crossProduct (double[] a, double[] b) {
		return new double[] 
                { 
                    (a[1] * b[2] - a[2] * b[1]), 
                    (a[2] * b[0] - a[0] * b[2]), 
                    (a[0] * b[1] - a[1] * b[0]) 
                };
	}

	private static double[] vectorProductIndexed (double[] v, double[] m, int i) {
		return new double[]
                {
                    v[i + 0] * m[0] + v[i + 1] * m[4] + v[i + 2] * m[8] + v[i + 3] * m[12],
                    v[i + 0] * m[1] + v[i + 1] * m[5] + v[i + 2] * m[9] + v[i + 3] * m[13],
                    v[i + 0] * m[2] + v[i + 1] * m[6] + v[i + 2] * m[10]+ v[i + 3] * m[14],
                    v[i + 0] * m[3] + v[i + 1] * m[7] + v[i + 2] * m[11]+ v[i + 3] * m[15]
                };
	}

	private static double[] vectorProduct (double[] v, double[] m) {
		return vectorProductIndexed(v, m, 0);
	}

	private static double[] matrixProduct (double[] a, double[] b) {
		double[] o1 = vectorProductIndexed(a, b, 0);
		double[] o2 = vectorProductIndexed(a, b, 4);
		double[] o3 = vectorProductIndexed(a, b, 8);
		double[] o4 = vectorProductIndexed(a, b, 12);

		return new double[]
                {
                    o1[0], o1[1], o1[2], o1[3],
                    o2[0], o2[1], o2[2], o2[3],
                    o3[0], o3[1], o3[2], o3[3],
                    o4[0], o4[1], o4[2], o4[3]
                };
	}

	private static double[] cameraTransform (double[] C, double[] A) {
		double[] w = normalize(addVector(C, scalarProduct(A, -1)));
		double[] y = new double[] { 0, 1, 0 };
		double[] u = normalize(crossProduct(y, w));
		double[] v = crossProduct(w, u);
		double[] t = scalarProduct(C, -1);

		return new double[]
                {
                    u[0], v[0], w[0], 0,
                    u[1], v[1], w[1], 0,
                    u[2], v[2], w[2], 0,
                    dotProduct(u, t), dotProduct(v, t), dotProduct(w, t), 1
                };
	}

	private static double[] viewingTransform (double fov, double n, double f) {
		fov *= (Math.PI / 180);
		double cot = 1.0 / Math.Tan(fov / 2);
		return new double[] { cot, 0, 0, 0, 0, cot, 0, 0, 0, 0, (f + n) / (f - n), -1, 0, 0, 2 * f * n / (f - n), 0 };
	}

	public static Image Generate (string captchaText) {
		int fontsize = 24;
		Font font = new Font("Arial", fontsize);

		SizeF sizeF;
		using (Graphics g = Graphics.FromImage(new Bitmap(1, 1))) {
			sizeF = g.MeasureString(captchaText, font, 0, StringFormat.GenericDefault);
		}

		int image2d_x = (int)sizeF.Width;
		int image2d_y = (int)(fontsize * 1.3);

		Bitmap image2d = new Bitmap(image2d_x, image2d_y);
		Color black = Color.Black;
		Color white = Color.White;

		using (Graphics g = Graphics.FromImage(image2d)) {
			g.Clear(black);
			g.DrawString(captchaText, font, Brushes.White, 0, 0);
		}

		Random rnd = new Random();
		double[] T = cameraTransform(new double[] { rnd.Next(-90, 90), -200, rnd.Next(150, 250) }, new double[] { 0, 0, 0 });
		T = matrixProduct(T, viewingTransform(60, 300, 3000));

		double[][] coord = new double[image2d_x * image2d_y][];

		int count = 0;
		for (int y = 0; y < image2d_y; y += 2) {
			for (int x = 0; x < image2d_x; x++) {
				int xc = x - image2d_x / 2;
				int zc = y - image2d_y / 2;
				double yc = -(double)(image2d.GetPixel(x, y).ToArgb() & 0xff) / 256 * 4;
				double[] xyz = new double[] { xc, yc, zc, 1 };
				xyz = vectorProduct(xyz, T);
				coord[count] = xyz;
				count++;
			}
		}

		int image3d_x = 256;
		int image3d_y = image3d_x * 9 / 16;
		Bitmap image3d = new Bitmap(image3d_x, image3d_y);
		Color fgcolor = Color.White;
		Color bgcolor = Color.Black;
		using (Graphics g = Graphics.FromImage(image3d)) {
			g.Clear(bgcolor);
			count = 0;
			double scale = 1.75 - (double)image2d_x / 400;
			for (int y = 0; y < image2d_y; y += 2) {
				for (int x = 0; x < image2d_x; x++) {
					if (x > 0) {
						double x0 = coord[count - 1][0] * scale + image3d_x / 2;
						double y0 = coord[count - 1][1] * scale + image3d_y / 2;
						double x1 = coord[count][0] * scale + image3d_x / 2;
						double y1 = coord[count][1] * scale + image3d_y / 2;
						g.DrawLine(new Pen(fgcolor), (float)x0, (float)y0, (float)x1, (float)y1);
					}
					count++;
				}
			}
		}
		return image3d;
	}
}

[Leixian]

用 Response.BinaryWrite 不行吖~~~ 各位大神指点一下

[慧眼识狗熊]

纯酱油..

[md5e]

看你是哪方面使用了,winForm还是webForm Captcha.Generate()

[Leixian]

引用 3 楼 liuchaolin 的回复:

看你是哪方面使用了,winForm还是webForm Captcha.Generate()

在网页上显示，当然是WebForm了~~~

[md5e]

System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent();//Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose();

[Leixian]

你这个直接调用肯定不行啊~~

[jiaoshiyao]

他说的是一般处理程序吧。。。。。。。。。。

[娃都会打酱油了]

Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); 主要就这几句就可以了啊

[Leixian]

引用 5 楼 liuchaolin 的回复:

System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent();//Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose();

刚没看到发的这个，我用这个试了一下，输出的全是乱码啊~~

[Leixian]

引用 8 楼 starfd 的回复:

Response.ClearContent(); Response.ContentType = "image/Jpeg"; Response.BinaryWrite(ms.ToArray()); 主要就这几句就可以了啊

你看我这么用对不对~~

		Image image = Captcha.Generate("12345");
		System.IO.MemoryStream ms = new System.IO.MemoryStream();
		image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
		Response.ClearContent();//Response.ClearContent();
		Response.ContentType = "image/Jpeg";
		Response.BinaryWrite(ms.ToArray());
		image.Dispose(); 

[md5e]

Response.Clear(); ..... Response.End();

[Leixian]

好了~！~ 可是如果直接访问这个页面的时候输出的不是图片而是文字乱码是怎么回事？？ 只有在图片地址中调用这个文件才是图片。

[md5e]

就看你是在哪里用的, 如果aspx里面是空的,是没有问题的,如果存在其它内容和标签,他就当是字符串处理

[md5e]

所以要用Response.End();强制结束,或者用.ashx来做处理

[Leixian]

引用 13 楼 liuchaolin 的回复:

就看你是在哪里用的, 如果aspx里面是空的,是没有问题的,如果存在其它内容和标签,他就当是字符串处理

嗯，是空的，现在如果在img标签中调用这个文件显示的是图片，可如果直接打开这个这个文件显示的则是乱码 Response.End 强制结束了也不行

[md5e]

Image image = Captcha.Generate("12345"); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent();//Response.ClearContent(); Response.ContentType = "image/Png"; Response.BinaryWrite(ms.ToArray()); image.Dispose(); Response.End(); 是这样?

[Leixian]

引用 16 楼 liuchaolin 的回复:

Image image = Captcha.Generate("12345"); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent();//Response.ClearContent(); Response.ContentType = "image/Png"; Response.BinaryWrite(ms.ToArray()); image.Dispose(); Response.End(); 是这样?

我这里用的就是Png~~~ 行了~~哈哈，我一直在刷新，刷新显示的是乱码，关闭再打开就OK了！ 谢谢！！结贴！