dmtxread.c

Datamatrix二维码库和测试程序,运行于linux,仔细研究可以很容易转化成VC程序,有这就没必要化钱买个控件了,本人libdmtx-0.3版本转化过,的确可行,现在把找到该版本的libdmtx

/*
libdmtx - Data Matrix Encoding/Decoding Library

Copyright (c) 2008 Mike Laughton
Copyright (c) 2008 Ryan Raasch
Copyright (c) 2008 Olivier Guilyardi

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

Contact: [e-mail]
*/

/* $Id: dmtxread.c 514 2008-11-19 17:10:44Z mblaughton $ */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <ctype.h>
#include <math.h>
#include <stdarg.h>
#include <assert.h>
#include <sysexits.h>
#include <magick/api.h>
#include <dmtx.h>
#include "dmtxread.h"
#include "../common/dmtxutil.h"

char *programName;

/**
 * @brief  Main function for the dmtxread Data Matrix scanning utility.
 * @param  argc count of arguments passed from command line
 * @param  argv list of argument passed strings from command line
 * @return Numeric exit code
 */
int
main(int argc, char *argv[])
{
   int err;
   int fileIndex;
   int pageIndex;
   int imgWidth, imgHeight;
   int fileScanCount, globalScanCount;
   int nFiles;
   UserOptions opt;
   DmtxTime  msec, *timeout;
   DmtxImage *img;
   DmtxDecode dec;
   DmtxRegion reg;
   DmtxMessage *msg;
   ImageReader reader;

   SetOptionDefaults(&opt);
   InitializeMagick(*argv);

   err = HandleArgs(&opt, &fileIndex, &argc, &argv);
   if(err != DMTX_SUCCESS)
      ShowUsage(EX_USAGE);

   timeout = (opt.timeoutMS == -1) ? NULL : &msec;

   reader.image = NULL;
   nFiles = argc - fileIndex;
   globalScanCount = 0;

   /* Loop once for each page of each image listed in parameters */
   for(pageIndex = 0; fileIndex < argc || (nFiles == 0 && fileIndex == argc);) {

      /* Reset timeout for each new image */
      if(timeout != NULL)
         msec = dmtxTimeAdd(dmtxTimeNow(), opt.timeoutMS);

      /* Open image file/stream */
      if(!reader.image) {
         if(argc == fileIndex)
            OpenImage(&reader, "-", opt.resolution);
         else
            OpenImage(&reader, argv[fileIndex], opt.resolution);

         if(!reader.image) {
            fileIndex++;
            continue;
         }
      }

      /* Read next image page (many formats are single-page only) */
      img = ReadImagePage(&reader, pageIndex++);

      /* If requested page did not load then move to the next image */
      if(img == NULL) {
         CloseImage(&reader);
         fileIndex++;
         pageIndex = 0;
         continue;
      }

      imgWidth = dmtxImageGetProp(img, DmtxPropWidth);
      imgHeight = dmtxImageGetProp(img, DmtxPropHeight);

      assert(img->pageCount > 0 && pageIndex <= img->pageCount);

      /* Initialize decode struct for newly loaded image */
      dec = dmtxDecodeStructInit(img);

      err = dmtxDecodeSetProp(&dec, DmtxPropScanGap, opt.scanGap);
      assert(err == DMTX_SUCCESS);

      if(opt.edgeMin != -1) {
         err = dmtxDecodeSetProp(&dec, DmtxPropEdgeMin, opt.edgeMin);
         assert(err == DMTX_SUCCESS);
      }

      if(opt.edgeMax != -1) {
         err = dmtxDecodeSetProp(&dec, DmtxPropEdgeMax, opt.edgeMax);
         assert(err == DMTX_SUCCESS);
      }

      if(opt.squareDevn != -1) {
         err = dmtxDecodeSetProp(&dec, DmtxPropSquareDevn, opt.squareDevn);
         assert(err == DMTX_SUCCESS);
      }

      err = dmtxDecodeSetProp(&dec, DmtxPropSymbolSize, opt.sizeIdxExpected);
      assert(err == DMTX_SUCCESS);

      err = dmtxDecodeSetProp(&dec, DmtxPropEdgeThresh, opt.edgeThresh);
      assert(err == DMTX_SUCCESS);

      if(opt.xMin) {
         err = dmtxDecodeSetProp(&dec, DmtxPropXmin, ScaleNumberString(opt.xMin, imgWidth));
         assert(err == DMTX_SUCCESS);
      }

      if(opt.xMax) {
         err = dmtxDecodeSetProp(&dec, DmtxPropXmax, ScaleNumberString(opt.xMax, imgWidth));
         assert(err == DMTX_SUCCESS);
      }

      if(opt.yMin) {
         err = dmtxDecodeSetProp(&dec, DmtxPropYmin, ScaleNumberString(opt.yMin, imgHeight));
         assert(err == DMTX_SUCCESS);
      }

      if(opt.yMax) {
         err = dmtxDecodeSetProp(&dec, DmtxPropYmax, ScaleNumberString(opt.yMax, imgHeight));
         assert(err == DMTX_SUCCESS);
      }

      err = dmtxDecodeSetProp(&dec, DmtxPropShrinkMin, opt.shrinkMin);
      assert(err == DMTX_SUCCESS);

      err = dmtxDecodeSetProp(&dec, DmtxPropShrinkMax, opt.shrinkMax);
      assert(err == DMTX_SUCCESS);

      /* Loop once for each detected barcode region */
      for(fileScanCount = 0;;) {

         /* Find next barcode region within image, but do not decode yet */
         reg = dmtxDecodeFindNextRegion(&dec, timeout);

         /* Finished file or ran out of time before finding another region */
         if(reg.found != DMTX_REGION_FOUND)
            break;

         /* Decode region based on requested barcode mode */
         if(opt.mosaic)
            msg = dmtxDecodeMosaicRegion(img, &reg, opt.correctionsMax);
         else
            msg = dmtxDecodeMatrixRegion(img, &reg, opt.correctionsMax);

         if(msg == NULL)
            continue;

         PrintDecodedOutput(&opt, img, &reg, msg, pageIndex);
         fileScanCount++;

         dmtxMessageFree(&msg);

         if(opt.stopAfter != -1 && fileScanCount >= opt.stopAfter)
            break;
      }
      globalScanCount += fileScanCount;

      if(opt.diagnose)
         WriteDiagnosticImage(&dec, &reg, "debug.pnm");

      dmtxDecodeStructDeInit(&dec);
      dmtxImageFree(&img);
   }

   DestroyMagick();

   exit((globalScanCount > 0) ? EX_OK : 1);
}

/**
 *
 *
 */
static void
SetOptionDefaults(UserOptions *opt)
{
   UserOptions option;

   memset(&option, 0x00, sizeof(UserOptions));

   /* Set default options */
   option.codewords = 0;
   option.edgeMin = -1;
   option.edgeMax = -1;
   option.squareDevn = -1;
   option.scanGap = 2;
   option.timeoutMS = -1;
   option.newline = 0;
   option.resolution = NULL;
   option.sizeIdxExpected = DmtxSymbolShapeAuto;
   option.edgeThresh = 5;
   option.xMin = NULL;
   option.xMax = NULL;
   option.yMin = NULL;
   option.yMax = NULL;
   option.correctionsMax = -1;
   option.diagnose = 0;
   option.mosaic = 0;
   option.stopAfter = -1;
   option.pageNumber = 0;
   option.corners = 0;
   option.shrinkMin = 1;
   option.shrinkMax = 1;
   option.verbose = 0;

   *opt = option;
}

/**
 * @brief  Set and validate user-requested options from command line arguments.
 * @param  opt runtime options from defaults or command line
 * @param  argcp pointer to argument count
 * @param  argvp pointer to argument list
 * @param  fileIndex pointer to index of first non-option arg (if successful)
 * @return DMTX_SUCCESS | DMTX_FAILURE
 */
static int
HandleArgs(UserOptions *opt, int *fileIndex, int *argcp, char **argvp[])
{
   int i;
   int err;
   int optchr;
   int longIndex;
   char *ptr;

   struct option longOptions[] = {
         {"codewords",        no_argument,       NULL, 'c'},
         {"minimum-edge",     required_argument, NULL, 'e'},
         {"maximum-edge",     required_argument, NULL, 'E'},
         {"gap",              required_argument, NULL, 'g'},
         {"list-formats",     no_argument,       NULL, 'l'},
         {"milliseconds",     required_argument, NULL, 'm'},
         {"newline",          no_argument,       NULL, 'n'},
         {"square-deviation", required_argument, NULL, 'q'},
         {"resolution",       required_argument, NULL, 'r'},
         {"symbol-size",      required_argument, NULL, 's'},
         {"threshold",        required_argument, NULL, 't'},
         {"x-range-min",      required_argument, NULL, 'x'},
         {"x-range-max",      required_argument, NULL, 'X'},
         {"y-range-min",      required_argument, NULL, 'y'},
         {"y-range-max",      required_argument, NULL, 'Y'},
         {"max-corrections",  required_argument, NULL, 'C'},
         {"diagnose",         no_argument,       NULL, 'D'},
         {"mosaic",           no_argument,       NULL, 'M'},
         {"stop-after",       required_argument, NULL, 'N'},
         {"page-number",      no_argument,       NULL, 'P'},
         {"corners",          no_argument,       NULL, 'R'},
         {"shrink",           required_argument, NULL, 'S'},
         {"verbose",          no_argument,       NULL, 'v'},
         {"version",          no_argument,       NULL, 'V'},
         {"help",             no_argument,       NULL,  0 },
         {0, 0, 0, 0}
   };

   programName = Basename((*argvp)[0]);

   *fileIndex = 0;

   for(;;) {
      optchr = getopt_long(*argcp, *argvp, "ce:E:g:lm:nq:r:s:t:x:X:y:Y:vC:DMN:PRS:V", longOptions, &longIndex);
      if(optchr == -1)
         break;

      switch(optchr) {
         case 0: /* --help */
            ShowUsage(EX_OK);
            break;
         case 'l': /* --help */
            ListImageFormats();
            exit(EX_OK);
            break;
         case 'c':
            opt->codewords = 1;
            break;
         case 'e':
            err = StringToInt(&(opt->edgeMin), optarg, &ptr);
            if(err != DMTX_SUCCESS || opt->edgeMin <= 0 || *ptr != '\0')
               FatalError(EX_USAGE, _("Invalid edge length specified \"%s\""), optarg);
            break;
         case 'E':
            err = StringToInt(&(opt->edgeMax), optarg, &ptr);
            if(err != DMTX_SUCCESS || opt->edgeMax <= 0 || *ptr != '\0')
               FatalError(EX_USAGE, _("Invalid edge length specified \"%s\""), optarg);
            break;
         case 'g':
            err = StringToInt(&(opt->scanGap), optarg, &ptr);
            if(err != DMTX_SUCCESS || opt->scanGap <= 0 || *ptr != '\0')
               FatalError(EX_USAGE, _("Invalid gap specified \"%s\""), optarg);
            break;
         case 'm':
            err = StringToInt(&(opt->timeoutMS), optarg, &ptr);
            if(err != DMTX_SUCCESS || opt->timeoutMS < 0 || *ptr != '\0')
               FatalError(EX_USAGE, _("Invalid timeout (in milliseconds) specified \"%s\""), optarg);
            break;
         case 'n':
            opt->newline = 1;
            break;
         case 'q':
            err = StringToInt(&(opt->squareDevn), optarg, &ptr);
            if(err != DMTX_SUCCESS || *ptr != '\0' ||
                  opt->squareDevn < 0 || opt->squareDevn > 90)
               FatalError(EX_USAGE, _("Invalid squareness deviation specified \"%s\""), optarg);
            break;
         case 'r':
            opt->resolution = optarg;
            break;
         case 's':
            /* Determine correct barcode size and/or shape */
            if(*optarg == 'a') {
               opt->sizeIdxExpected = DmtxSymbolShapeAuto;
            }
            else if(*optarg == 's') {
               opt->sizeIdxExpected = DmtxSymbolSquareAuto;
            }
            else if(*optarg == 'r') {
               opt->sizeIdxExpected = DmtxSymbolRectAuto;
            }
            else {
               for(i = 0; i < DMTX_SYMBOL_SQUARE_COUNT + DMTX_SYMBOL_RECT_COUNT; i++) {
                  if(strncmp(optarg, symbolSizes[i], 8) == 0) {
                     opt->sizeIdxExpected = i;
                     break;
                  }
               }
               if(i == DMTX_SYMBOL_SQUARE_COUNT + DMTX_SYMBOL_RECT_COUNT)
                  return DMTX_FAILURE;
            }
            break;
         case 't':
            err = StringToInt(&(opt->edgeThresh), optarg, &ptr);
            if(err != DMTX_SUCCESS || *ptr != '\0' ||
                  opt->edgeThresh < 1 || opt->edgeThresh > 100)
               FatalError(EX_USAGE, _("Invalid edge threshold specified \"%s\""), optarg);
            break;
         case 'x':
            opt->xMin = optarg;
            break;
         case 'X':
            opt->xMax = optarg;
            break;
         case 'y':
            opt->yMin = optarg;
            break;
         case 'Y':
            opt->yMax = optarg;
            break;
         case 'v':
            opt->verbose = 1;
            break;
         case 'C':
            err = StringToInt(&(opt->correctionsMax), optarg, &ptr);
            if(err != DMTX_SUCCESS || opt->correctionsMax < 0 || *ptr != '\0')
               FatalError(EX_USAGE, _("Invalid max corrections specified \"%s\""), optarg);
            break;
         case 'D':
            opt->diagnose = 1;