iOS self-scanning and two-dimensional code generation

Original address: iOS self-scanning and generating two-dimensional code

1. Two d code generation

Libqrencode Introduction: Is a C language used to parse two-dimensional barcode (QRCode) of the program library, Libqrencode through the phone's CCD camera to scan two-dimensional barcode. Http://pan.baidu.com/s/1eQs1Epk

Import Libqrencode Library, the following direct code:

[OBJC]View plain copy #import <Foundation/Foundation.h> @interface qrcodegenerator:nsobject + (UIImage *) Qrima   Geforstring: (NSString *) string imagesize: (cgfloat) size;   + (UIImage *) Twodimensioncodeimage: (UIImage *) Twodimensioncode withavatarimage: (UIImage *) avatarimage; @end
[OBJC]  View plain copy #import   "QRCodeGenerator.h"    #import   "qrencode.h"        enum {       qr_margin = 3  };       @implementation  QRCodeGenerator      +  (void) Drawqrcode: (qrcode *) code  context: (Cgcontextref) Ctx size: (cgfloat) size {       unsigned  charchar *data = 0;       int width;        data = code->data;       width = code- >width;       float zoom =  (Double) size /  (code-> Width + 2.0 * qr_margin);       cgrect rectdraw =  cgrectmake (0, 0, zoom, zoom);               // draw       cgcontextsetfillcolor (Ctx, cgcolorgetcomponents ([ Uicolor blackcolor]. Cgcolor));       for (int i = 0; i < width;  ++i)  {           for (int j = 0; j &NBSP;&LT;&NBSP;WIDTH;&NBSP;++J)  {                if (*data & 1)  {                    rectdraw.origin = cgpointmake ((j +  Qr_margin)  * zoom, (i + qr_margin)  * zoom);                    cgcontextaddrect (Ctx, rectDraw);                }   &NBSP;&Nbsp;          ++data;            }       }        Cgcontextfillpath (CTX);  }      +  (uiimage *) qrimageforstring: (NSString  *) String imagesize: (cgfloat) size {       if  (![ String length])  {           return nil;        }              qrcode  *code = qrcode_encodestring ([String utf8string], 0, qr_eclevel_l, qr_mode_ 8, 1