rdmtx.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

/*
Rdmtx - Ruby wrapper for libdmtx

Copyright (c) 2008 Romain Goyet

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]
*/

/* $Id:$ */

#include <ruby.h>
#include <dmtx.h>

static VALUE rdmtx_init(VALUE self) {
    return self;
}

static VALUE rdmtx_decode(VALUE self, VALUE image /* Image from RMagick (Magick::Image) */, VALUE timeout /* Timeout in msec */) {

    VALUE rawImageString = rb_funcall(image, rb_intern("export_pixels_to_str"), 0);

    VALUE safeImageString = StringValue(rawImageString);

    char * imageBuffer = RSTRING(safeImageString)->ptr;

    int width = NUM2INT(rb_funcall(image, rb_intern("columns"), 0));
    int height = NUM2INT(rb_funcall(image, rb_intern("rows"), 0));
    DmtxImage * dmtxImage = dmtxImageMalloc(width, height);
    dmtxImageSetProp(dmtxImage, DmtxPropScaledXmin, 0);
    dmtxImageSetProp(dmtxImage, DmtxPropScaledXmax, width);
    dmtxImageSetProp(dmtxImage, DmtxPropScaledYmin, 0);
    dmtxImageSetProp(dmtxImage, DmtxPropScaledYmax, height);

    memcpy(dmtxImage->pxl, imageBuffer, width*height*3);

    VALUE results = rb_ary_new();

    /* Initialize decode struct for newly loaded image */
    DmtxDecode decode = dmtxDecodeStructInit(dmtxImage);

    DmtxRegion region;

    int intTimeout = NUM2INT(timeout);
    DmtxTime dmtxTimeout = dmtxTimeAdd(dmtxTimeNow(), intTimeout);

    do {
        if (intTimeout == 0) {
            region = dmtxDecodeFindNextRegion(&decode, NULL);
        } else {
            region = dmtxDecodeFindNextRegion(&decode, &dmtxTimeout);
        }

        if (region.found == DMTX_REGION_FOUND) {
            DmtxMessage * message = dmtxDecodeMatrixRegion(dmtxImage, &region, -1);
            if (message != NULL) {
                VALUE outputString = rb_str_new2((char *)message->output);
                rb_ary_push(results, outputString);
                dmtxMessageFree(&message);
            }
        }
    } while (region.found != DMTX_REGION_EOF && region.found != DMTX_REGION_TIMEOUT);

    dmtxDecodeStructDeInit(&decode);

    dmtxImageFree(&dmtxImage);

    return results;
}

static VALUE rdmtx_encode(VALUE self, VALUE string) {

    /* Create and initialize libdmtx structures */
    DmtxEncode enc = dmtxEncodeStructInit();

    VALUE safeString = StringValue(string);

    /* Create barcode image */
    if (dmtxEncodeDataMatrix(&enc, RSTRING(safeString)->len, (unsigned char *)RSTRING(safeString)->ptr, DmtxSymbolSquareAuto) == DMTX_FAILURE) {
//        printf("Fatal error !\n");
        dmtxEncodeStructDeInit(&enc);
        return Qnil;
    }


    int width = dmtxImageGetProp(enc.image, DmtxPropWidth);
    int height = dmtxImageGetProp(enc.image, DmtxPropHeight);

    VALUE magickImageClass = rb_path2class("Magick::Image");
    VALUE outputImage = rb_funcall(magickImageClass, rb_intern("new"), 2, INT2NUM(width), INT2NUM(height));

    rb_funcall(outputImage, rb_intern("import_pixels"), 7,
               INT2NUM(0),
               INT2NUM(0),
               INT2NUM(width),
               INT2NUM(height),
               rb_str_new("RGB", 3),
               rb_str_new((char *)(enc.image)->pxl, 3*width*height),
//               rb_const_get("Magick" ,rb_intern("CharPixel"))
               rb_eval_string("Magick::CharPixel"));

    /* Clean up */
    dmtxEncodeStructDeInit(&enc);

    return outputImage;
}

VALUE cRdmtx;
void Init_Rdmtx() {
    cRdmtx = rb_define_class("Rdmtx", rb_cObject);
    rb_define_method(cRdmtx, "initialize", rdmtx_init, 0);
    rb_define_method(cRdmtx, "decode", rdmtx_decode, 2);
    rb_define_method(cRdmtx, "encode", rdmtx_encode, 1);
}