opc_relation.c

Demonstrates how to traverse all relations in an OPC container using the API.

/*
    Traverse all relations of an OPC container or get the type of an relation.

    Ussage:
    * Traverse all relations:
      opc_relation FILENAME
    * Get type of root relation
      opc_relation FILENAME RELATIONID
    * Get type of part relation
      opc_relation FILENAME PARTNAME RELATIONID

    Sample:
    opc_relation OOXMLI1.docx
    opc_relation OOXMLI1.docx "rId1"
    opc_relation OOXMLI1.docx "word/document.xml" "rId1"
*/

#include <opc/opc.h>
#ifdef WIN32
#include <crtdbg.h>
#endif

static void traverse(opcContainer *c, opcPart source) {
    for(opcRelation rel=opcRelationFirst(c, source);OPC_RELATION_INVALID!=rel;rel=opcRelationNext(c, source, rel)) {
        opcPart target=opcRelationGetInternalTarget(c, source, rel);
        if (OPC_PART_INVALID!=target) {
            const xmlChar *prefix=NULL;
            opc_uint32_t counter=-1;
            const xmlChar *type=NULL;
            opcRelationGetInformation(c, source, rel, &prefix, &counter, &type);
            char buf[20]="";
            if (-1!=counter) {
                sprintf(buf, "%i", counter);
            }
            printf("%s %s%s %s %s\n", source, prefix, buf, target, type);
            traverse(c, target);
        }
    }
}

int main( int argc, const char* argv[] )
{
#ifdef WIN32
     _CrtSetDbgFlag (_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
#endif

    opcInitLibrary();
    opcContainer *c=opcContainerOpen(_X(argv[1]), OPC_OPEN_READ_ONLY, NULL, NULL);
    if (NULL!=c) {
        if (3==argc) {
            opcRelation rel=opcRelationFind(c, OPC_PART_INVALID, _X(argv[2]), NULL);
            if (OPC_RELATION_INVALID!=rel) {
                const xmlChar *type=NULL;
                opcRelationGetInformation(c, OPC_PART_INVALID, rel, NULL, NULL, &type);
                printf("type=%s\n", type);
            }
        } else if (4==argc) {
            opcPart part=opcPartFind(c, _X(argv[2]), NULL, 0);
            if (OPC_PART_INVALID!=part) {
                opcRelation rel=opcRelationFind(c, part, _X(argv[3]), NULL);
                if (OPC_RELATION_INVALID!=rel) {
                    const xmlChar *type=NULL;
                    opcRelationGetInformation(c, part, rel, NULL, NULL, &type);
                    printf("type=%s\n", type);
                }
            }
        } else {
            traverse(c, OPC_PART_INVALID);
        }
        opcContainerClose(c, OPC_CLOSE_NOW);
    }
    opcFreeLibrary();
#ifdef WIN32
    OPC_ASSERT(!_CrtDumpMemoryLeaks());
#endif
    return 0;
}