C # generates two-dimensional code, trim border

The QR code generated with Google Zxing has a white border and is displayed on the report (using Crystal Report), which makes the QR code too small to scan for recognition due to limited space.

By trimming out the white border, you can maximize the display of the QR code in a limited space.

usingcom.google.zxing;usingCom.google.zxing.common;usingCom.google.zxing.qrcode.decoder;usingJava.awt.image;usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Drawing;usingSystem.Drawing.Imaging;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespacesunway.barcode{/// <summary>    ///     /// </summary>     Public Static classBarcodehelper {/// <summary>        ///         /// </summary>        /// <param name= "info" ></param>         /// <returns></returns>         Public Static stringCreatebarcode (stringinfo) {            stringFilePath =string.             Empty; FilePath= Guid.NewGuid (). ToString () +". PNG"; //            Try{multiformatwriter writer=NewMultiformatwriter (); Hashtable hints=NewHashtable (); Hints. ADD (Encodehinttype.character_set,"Utf-8");//CodingErrorcorrectionlevel level =ErrorCorrectionLevel.H; Hints. ADD (encodehinttype.error_correction, level); //Tolerance Rate//hints.  ADD (encodehinttype.margin, 0); //Two-dimensional code border width, here the document says set 0-4,Bytematrix Bytematrix = Writer.encode (info, Barcodeformat.qr_code, -, -, hints); Bitmap Bitmap=Tobitmap (Bytematrix); //bitmap.            Save (FilePath); }            Catch(Exception) {FilePath=string.                Empty; Throw; }            finally            {            }             //            returnFilePath; }        /// <summary>        ///Convert to Bitmap/// </summary>        /// <param name= "Matrix" ></param>        /// <returns></returns>         Public StaticBitmap Tobitmap (Bytematrix matrix) {intwidth =Matrix.            Width; intHeight =Matrix.            Height; //32-bit ARGB formatBitmap Bmap =NewBitmap (width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb); Color Colorblack= Colortranslator.fromhtml ("0xff000000");//BlackColor Colorwhite = colortranslator.fromhtml ("0xFFFFFFFF");//White//The two-dimensional matrix is converted into a one-dimensional pixel group, which is always lined up horizontally.//color[] pixels = new int[width * height];            BOOLIsfirstblackpoint =false; intStartX =0; intStarty =0; //Looping content matrix, writing white, black dots             for(intx =0; x < width; X + +)            {                 for(inty =0; Y < height; y++)                {                    if(Matrix.get_renamed (x, y)! =-1)//return white point/black point                    {                        if(!isfirstblackpoint) {Isfirstblackpoint=true; StartX= x;//The QR code comes with a white border, the upper-left corner of the border is a black point, and the top-left corner is recorded .Starty =y; }} bmap. SetPixel (x, Y, matrix.get_renamed (x, y)!= -1?colorblack:colorwhite); }            }            #regionJudge and InterceptintPadding_size_min =2; intX1 = StartX-padding_size_min; intY1 = Starty-padding_size_min; if(X1 <0|| Y1 <0)            {                returnBmap; }            Else            {                intW1 = width-x1 *2; intH1 = Height-y1 *2; Bitmap BITMAPQR= Cutimage (Bmap,NewRectangle (x1, y1, W1, H1)); returnBITMAPQR; }            #endregion        }                /// <summary>        ///capture a picture, specify the Intercept area (start position and length/width)/// </summary>        /// <param name= "img" ></param>        /// <param name= "rect" ></param>        /// <returns></returns>        Private StaticBitmap cutimage (Image img, Rectangle rect) {Bitmap B=NewBitmap (rect. Width, Rect.            Height, Pixelformat.format32bppargb); Graphics g=Graphics.fromimage (b); G.drawimage (IMG,0,0, Rect, graphicsunit.pixel);            G.dispose (); returnb; }    }}

C # generates two-dimensional code, trim border