转换iTextSharp.text.Image回为System.Drawing.Image [英] Converting iTextSharp.text.Image back to System.Drawing.Image

问题描述

我想转换类型iTextSharp.text.Image回System.Drawing.Image对象的对象。
下面是一段代码，不工作：

I am trying to convert object of type iTextSharp.text.Image back to System.Drawing.Image. Here is a chunk of code that is not working:

System.Drawing.Image img = System.Drawing.Image.FromStream(new MemoryStream(itextImg.RawData));

我可以要对此都错了，但我不会知道，除非我请教专家，后两小时无果而终的在线搜索，我终于发布它自己的问题。

I could be going about this all wrong, but I won't know unless I consult the experts, and after two hours of fruitless searching online, I am finally posting it myself as a question.

推荐答案

是的，我找到了解决办法通过下面的描述改写BarcodeQRCode类iTextSharp的和GetImageMethod（）的：

Yes, I found the solution by rewriting BarcodeQRCode class of ITextSharp and GetImageMethod() as described below:

using System;
using System.Collections.Generic;
using System.Drawing;
using iTextSharp.text;
using iTextSharp.text.pdf.qrcode;
using iTextSharp.text.pdf.codec;
/*
   Class rewritted to Convert ByteMatrix to BMP image by rewritting GetImage method
from ITextSharp 
author: Luis Claudio Souza
*/

namespace iTextSharp.text.pdf{

/**
 * A QRCode implementation based on the zxing code.
 * @author Paulo Soares
 * @since 5.0.2
 */
public class BarcodeQRCode {
    ByteMatrix bm;

    /**
     * Creates the QR barcode. The barcode is always created with the smallest possible     size and is then stretched
     * to the width and height given. Set the width and height to 1 to get an unscaled barcode.
     * @param content the text to be encoded
     * @param width the barcode width
     * @param height the barcode height
     * @param hints modifiers to change the way the barcode is create. They can be EncodeHintType.ERROR_CORRECTION
     * and EncodeHintType.CHARACTER_SET. For EncodeHintType.ERROR_CORRECTION the values can be ErrorCorrectionLevel.L, M, Q, H.
     * For EncodeHintType.CHARACTER_SET the values are strings and can be Cp437, Shift_JIS and ISO-8859-1 to ISO-8859-16. The default value is
     * ISO-8859-1.
     * @throws WriterException
     */
    public BarcodeQRCode(String content, int width, int height, IDictionary<EncodeHintType, Object> hints) {
        QRCodeWriter qc = new QRCodeWriter();
        bm = qc.Encode(content, width, height, hints);
    }

    private byte[] GetBitMatrix() {
        int width = bm.GetWidth();
        int height = bm.GetHeight();
        int stride = (width + 7) / 8;
        byte[] b = new byte[stride * height];
        sbyte[][] mt = bm.GetArray();
        for (int y = 0; y < height; ++y) {
            sbyte[] line = mt[y];
            for (int x = 0; x < width; ++x) {
                if (line[x] != 0) {
                    int offset = stride * y + x / 8;
                    b[offset] |= (byte)(0x80 >> (x % 8));
                }
            }
        }
        return b;
    }

    /** Gets an <CODE>Image</CODE> with the barcode.
     * @return the barcode <CODE>Image</CODE>
     * @throws BadElementException on error
     */

    public void GetImage()
    {

        sbyte[][] imgNew = bm.GetArray();
        Bitmap bmp1 = new Bitmap(bm.GetWidth(), bm.GetHeight());


        Graphics g1 = Graphics.FromImage(bmp1);
        g1.Clear(Color.White);
        for (int i = 0; i <= imgNew.Length - 1; i++)
        {
            for (int j = 0; j <= imgNew[i].Length - 1; j++)
            {
                if (imgNew[j][i] == 0)
                {
                    g1.FillRectangle(Brushes.Black, i, j, 1, 1);
                }
                else
                {
                    g1.FillRectangle(Brushes.White, i, j, 1, 1);
                }
            }
        }
        bmp1.Save("D:\\QREncode.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);


    }

    }
}

在这之后，我用这个代码调用该方法：

After that, I used this code to call the method:

            var hints = new Dictionary<EncodeHintType, object>();
        hints.Add(EncodeHintType.ERROR_CORRECTION, iTextSharp.text.pdf.qrcode.ErrorCorrectionLevel.H);


        BarcodeQRCode code = new BarcodeQRCode("98134979213479523874952873", 100, 100, hints);

        code.GetImage();

在新的getImage方法，您可以选择如何处理BMP类做。在这种情况下，这样可以节省JPEG图像文件，但该方法可以返回到由呼叫方可以使用一个MemoryStream

In new GetImage method, you can choose what to do with the bmp class. In this case, it saves a JPEG image file but the method can either return a memorystream to be used by the caller.

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