opc_mem.c

Demonstrates the the use of opcContainerOpenMem, i.e. how to use "in-memory" containers.

/*
    Dump all information about an OPC container via the memory-based OPC container interface.

    Ussage:
    opc_mem FILENAME

    Sample:
    opc_mem OOXMLI1.docx
*/
#include <opc/opc.h>
#include <stdio.h>
#include <time.h>
#ifdef WIN32
#include <crtdbg.h>
#endif

int main( int argc, const char* argv[] )
{
#ifdef WIN32
     _CrtSetDbgFlag (_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);
#endif
    time_t start_time=time(NULL);
    opc_error_t err=OPC_ERROR_NONE;
    if (OPC_ERROR_NONE==opcInitLibrary() && 2==argc) {
        opcContainer *c=NULL;
        FILE *f=fopen(argv[1], "rb");
        fseek(f, 0, SEEK_END);
        opc_uint32_t data_len=ftell(f);
        fseek(f, 0, SEEK_SET);
        opc_uint8_t *data=(opc_uint8_t *)xmlMalloc(data_len);
        size_t fread_len=fread(data, 1, data_len, f);
        fclose(f);
        if (data_len!=fread_len) {
            printf("ERROR: reading file.\n");
        } else if (NULL!=(c=opcContainerOpenMem(data, data_len, OPC_OPEN_READ_ONLY, NULL))) {
            opcContainerDump(c, stdout);
            opcContainerClose(c, OPC_CLOSE_NOW);
        } else {
            printf("ERROR: \"%s\" could not be opened.\n", argv[1]);
            err=OPC_ERROR_STREAM;
        }
        xmlFree(data);
        opcFreeLibrary();
    } else if (2==argc) {
        printf("ERROR: initialization of libopc failed.\n");    
        err=OPC_ERROR_STREAM;
    } else {
        printf("opc_dump FILENAME.\n\n");
        printf("Sample: opc_dump test.docx\n");
    }
    time_t end_time=time(NULL);
    fprintf(stderr, "time %.2lfsec\n", difftime(end_time, start_time));
#ifdef WIN32
    OPC_ASSERT(!_CrtDumpMemoryLeaks());
#endif
    return (OPC_ERROR_NONE==err?0:3);   
}