reading blob using cfront

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  fb Member Posts: 246

  2005-07-28

  The function 'VerifyTestData' in the c/front sample program 'sample.c' contains the following code that peeks at the contents of a BLOB field (field # 90):

  .
      .
      .
      memset(s, i, sizeof(s));
      FieldDataAddr = DBL_GetFieldDataAddr(hTable,hRec,90);
      if (memcmp(FieldDataAddr,s,sizeof(s)))
      {
        printf("BLOB field differs %d\nError !!\n",i);
        DBL_FreeRec(hRec);
        return(-1);
      }
      if(sizeof(s) != DBL_GetFieldDataSize(hTable,90,FieldDataAddr))
      {
        printf("BLOB field datasize %d\nError !!\n",i);
        DBL_FreeRec(hRec);
        return(-1);
      }
      .
      .
      .
  

  The key functions here are 'DBL_GetFieldDataAddr' (returns a pointer to the beginning of the BLOB data, and 'DBL_GetFieldDataSize' (returns the length of the BLOB data).
  
  Hope this helps.

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  jks Member Posts: 277

  2005-07-29

  How can i declare a pointer to blob data type?
  
  Because when i specify like
  DBL_BLOB *dblob;
  Then it gives an error that DBL_BLOB undefiened identifier.
  
  Please help.

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