dgnhelp.cpp

在Linux环境下读写DGN文件

      case DGNST_COLORTABLE:
      {
          DGNElemColorTable *psCT = (DGNElemColorTable *) psElement;
          int			i;

          fprintf( fp, "  screen_flag: %d\n", psCT->screen_flag );
          for( i = 0; i < 256; i++ )
          {
              fprintf( fp, "  %3d: (%3d,%3d,%3d)\n",
                       i, 
                       psCT->color_info[i][0], 
                       psCT->color_info[i][1], 
                       psCT->color_info[i][2] );
          }
      }
      break;

      case DGNST_TCB:
      {
          DGNElemTCB *psTCB = (DGNElemTCB *) psElement;
          int iView;

          fprintf( fp, "  dimension = %d\n", psTCB->dimension );
          fprintf( fp, "  uor_per_subunit = %ld, subunits = `%s'\n",
                   psTCB->uor_per_subunit, psTCB->sub_units );
          fprintf( fp, "  subunits_per_master = %ld, master units = `%s'\n",
                   psTCB->subunits_per_master, psTCB->master_units );
          fprintf( fp, "  origin = (%.5f,%.5f,%.5f)\n", 
                   psTCB->origin_x,
                   psTCB->origin_y,
                   psTCB->origin_z );

          for( iView = 0; iView < 8; iView++ )
          {
              DGNViewInfo *psView = psTCB->views + iView;
              
              fprintf(fp, 
                      "  View%d: flags=%04X, levels=%02X%02X%02X%02X%02X%02X%02X%02X\n",
                      iView,
                      psView->flags, 
                      psView->levels[0],
                      psView->levels[1],
                      psView->levels[2],
                      psView->levels[3],
                      psView->levels[4],
                      psView->levels[5],
                      psView->levels[6],
                      psView->levels[7] );
              fprintf(fp, 
                      "        origin=(%g,%g,%g)\n        delta=(%g,%g,%g)\n", 
                      psView->origin.x, psView->origin.y, psView->origin.z,
                      psView->delta.x, psView->delta.y, psView->delta.z );
          }
      }
      break;

      case DGNST_TAG_SET:
      {
          DGNElemTagSet	*psTagSet = (DGNElemTagSet*) psElement;
          int            iTag;

          fprintf( fp, "  tagSetName=%s, tagSet=%d, tagCount=%d, flags=%d\n", 
                   psTagSet->tagSetName, psTagSet->tagSet, 
                   psTagSet->tagCount, psTagSet->flags );
          for( iTag = 0; iTag < psTagSet->tagCount; iTag++ )
          {
              DGNTagDef *psTagDef = psTagSet->tagList + iTag;

              fprintf( fp, "    %d: name=%s, type=%d, prompt=%s", 
                       psTagDef->id, psTagDef->name, psTagDef->type, 
                       psTagDef->prompt );
              if( psTagDef->type == 1 )
                  fprintf( fp, ", default=%s\n", 
                           psTagDef->defaultValue.string );
              else if( psTagDef->type == 3 || psTagDef->type == 5 )
                  fprintf( fp, ", default=%d\n", 
                           psTagDef->defaultValue.integer );
              else if( psTagDef->type == 4 )
                  fprintf( fp, ", default=%g\n", 
                           psTagDef->defaultValue.real );
              else
                  fprintf( fp, ", default=<unknown>\n" );
          }
      }
      break;

      case DGNST_TAG_VALUE:
      {
          DGNElemTagValue *psTag = (DGNElemTagValue*) psElement;

          fprintf( fp, "  tagType=%d, tagSet=%d, tagIndex=%d, tagLength=%d\n", 
                   psTag->tagType, psTag->tagSet, psTag->tagIndex, 
                   psTag->tagLength );
          if( psTag->tagType == 1 )
              fprintf( fp, "  value=%s\n", psTag->tagValue.string );
          else if( psTag->tagType == 3 )
              fprintf( fp, "  value=%d\n", psTag->tagValue.integer );
          else if( psTag->tagType == 4 )
              fprintf( fp, "  value=%g\n", psTag->tagValue.real );
      }
      break;

      default:
        break;
    }

    if( psElement->attr_bytes > 0 )
    {
        int iLink;

        fprintf( fp, "Attributes (%d bytes):\n", psElement->attr_bytes );
        
        for( iLink = 0; TRUE; iLink++ )

        {
            int nLinkType, nEntityNum=0, nMSLink=0, nLinkSize, i;
            unsigned char *pabyData;

            pabyData = DGNGetLinkage( hDGN, psElement, iLink, &nLinkType, 
                                      &nEntityNum, &nMSLink, &nLinkSize );
            if( pabyData == NULL )
                break;

            fprintf( fp, "Type=0x%04x", nLinkType );
            if( nMSLink != 0 || nEntityNum != 0 )
                fprintf( fp, ", EntityNum=%d, MSLink=%d", 
                         nEntityNum, nMSLink );
            fprintf( fp, "\n  0x" );

            for( i = 0; i < nLinkSize; i++ )
                fprintf( fp, "%02x", pabyData[i] );
            fprintf( fp, "\n" );
            
        }
    }
}


/************************************************************************/
/*                           DGNTypeToName()                            */
/************************************************************************/

/**
 * Convert type to name.
 *
 * Returns a human readable name for an element type such as DGNT_LINE.
 *
 * @param nType the DGNT_* type code to translate.
 *
 * @return a pointer to an internal string with the translation.  This string
 * should not be modified or freed.
 */

const char *DGNTypeToName( int nType )

{
    static char	szNumericResult[16];

    switch( nType )
    {
      case DGNT_CELL_LIBRARY:
        return "Cell Library";
        
      case DGNT_CELL_HEADER:
        return "Cell Header";
        
      case DGNT_LINE:
        return "Line";
        
      case DGNT_LINE_STRING:
        return "Line String";

      case DGNT_GROUP_DATA:
        return "Group Data";

      case DGNT_SHAPE:
        return "Shape";
        
      case DGNT_TEXT_NODE:
        return "Text Node";

      case DGNT_DIGITIZER_SETUP:
        return "Digitizer Setup";
        
      case DGNT_TCB:
        return "TCB";
        
      case DGNT_LEVEL_SYMBOLOGY:
        return "Level Symbology";
        
      case DGNT_CURVE:
        return "Curve";
        
      case DGNT_COMPLEX_CHAIN_HEADER:
        return "Complex Chain Header";
        
      case DGNT_COMPLEX_SHAPE_HEADER:
        return "Complex Shape Header";
        
      case DGNT_ELLIPSE:
        return "Ellipse";
        
      case DGNT_ARC:
        return "Arc";
        
      case DGNT_TEXT:
        return "Text";

      case DGNT_BSPLINE:
        return "B-Spline";

      case DGNT_APPLICATION_ELEM:
        return "Application Element";

      case DGNT_SHARED_CELL_DEFN:
        return "Shared Cell Definition";
        
      case DGNT_SHARED_CELL_ELEM:
        return "Shared Cell Element";
        
      case DGNT_TAG_VALUE:
        return "Tag Value";
        
      default:
        sprintf( szNumericResult, "%d", nType );
        return szNumericResult;
    }
}

/************************************************************************/
/*                         DGNGetAttrLinkSize()                         */
/************************************************************************/

/**
 * Get attribute linkage size. 
 *
 * Returns the size, in bytes, of the attribute linkage starting at byte
 * offset nOffset.  On failure a value of 0 is returned.
 *
 * @param hDGN the file from which the element originated.
 * @param psElement the element to report on.
 * @param nOffset byte offset within attribute data of linkage to check.
 *
 * @return size of linkage in bytes, or zero. 
 */

int DGNGetAttrLinkSize( DGNHandle hDGN, DGNElemCore *psElement, 
                        int nOffset )

{
    if( psElement->attr_bytes < nOffset + 4 )
        return 0;

    /* DMRS Linkage */
    if( (psElement->attr_data[nOffset+0] == 0 
         && psElement->attr_data[nOffset+1] == 0)
        || (psElement->attr_data[nOffset+0] == 0 
            && psElement->attr_data[nOffset+1] == 0x80) )
        return 8;

    /* If low order bit of second byte is set, first byte is length */
    if( psElement->attr_data[nOffset+1] & 0x10 )
        return psElement->attr_data[nOffset+0] * 2 + 2;

    /* unknown */
    return 0;
}

/************************************************************************/
/*                           DGNGetLinkage()                            */
/************************************************************************/

/**
 * Returns requested linkage raw data. 
 *
 * A pointer to the raw data for the requested attribute linkage is returned
 * as well as (potentially) various information about the linkage including
 * the linkage type, database entity number and MSLink value, and the length
 * of the raw linkage data in bytes.
 *
 * If the requested linkage (iIndex) does not exist a value of zero is 
 * returned.
 *
 * The entity number is (loosely speaking) the index of the table within
 * the current database to which the MSLINK value will refer.  The entity
 * number should be used to lookup the table name in the MSCATALOG table. 
 * The MSLINK value is the key value for the record in the target table. 
 *
 * @param hDGN the file from which the element originated.
 * @param psElement the element to report on.
 * @param iIndex the zero based index of the linkage to fetch.
 * @param pnLinkageType variable to return linkage type.  This may be one of
 * the predefined DGNLT_ values or a different value. This pointer may be NULL.
 * @param pnEntityNum variable to return the entity number in or NULL if not
 * required.  
 * @param pnMSLink variable to return the MSLINK value in, or NULL if not 
 * required.
 * @param pnLength variable to returned the linkage size in bytes or NULL.
 * 
 * @return pointer to raw internal linkage data.  This data should not be
 * altered or freed.  NULL returned on failure. 
 */

unsigned char *DGNGetLinkage( DGNHandle hDGN, DGNElemCore *psElement, 
                              int iIndex, int *pnLinkageType,
                              int *pnEntityNum, int *pnMSLink, int *pnLength )
    
{
    int nAttrOffset;
    int iLinkage, nLinkSize;

    for( iLinkage=0, nAttrOffset=0;
         (nLinkSize = DGNGetAttrLinkSize( hDGN, psElement, nAttrOffset)) != 0;
         iLinkage++, nAttrOffset += nLinkSize )
    {
        if( iLinkage == iIndex )
        {
            int  nLinkageType=0, nEntityNum=0, nMSLink = 0;
            CPLAssert( nLinkSize > 4 );

            if( psElement->attr_data[nAttrOffset+0] == 0x00
                && (psElement->attr_data[nAttrOffset+0] == 0x00
                    || psElement->attr_data[nAttrOffset+0] == 0x80) )
            {
                nLinkageType = DGNLT_DMRS;
                nEntityNum = psElement->attr_data[nAttrOffset+2] 
                    + psElement->attr_data[nAttrOffset+3] * 256;
                nMSLink = psElement->attr_data[nAttrOffset+4] 
                    + psElement->attr_data[nAttrOffset+5] * 256
                    + psElement->attr_data[nAttrOffset+6] * 65536;
            }
            else
                nLinkageType = psElement->attr_data[nAttrOffset+2] 
                    + psElement->attr_data[nAttrOffset+3] * 256;

            // Possibly an external database linkage?
            if( nLinkSize == 16 && nLinkageType != DGNLT_SHAPE_FILL )
            {
                nEntityNum = psElement->attr_data[nAttrOffset+6] 
                    + psElement->attr_data[nAttrOffset+7] * 256;
                nMSLink = psElement->attr_data[nAttrOffset+8] 
                    + psElement->attr_data[nAttrOffset+9] * 256
                    + psElement->attr_data[nAttrOffset+10] * 65536
                    + psElement->attr_data[nAttrOffset+11] * 65536 * 256;
                
            }

            if( pnLinkageType != NULL )
                *pnLinkageType = nLinkageType;
            if( pnEntityNum != NULL )
                *pnEntityNum = nEntityNum;
            if( pnMSLink != NULL )
                *pnMSLink = nMSLink;
            if( pnLength != NULL )
                *pnLength = nLinkSize;

            return psElement->attr_data + nAttrOffset;
        }
    }
             
    return NULL;
}