reading blob using cfront

jks

Hi all,

Can anybody tell me how can i read the value of the blob field using cfront(inside c++ program)?

What is the difference between cfront.ocx and simple cfront(i.e cfrontsql.dll)?

Do i need to use ocx to access blob fields?

Please help.

fb

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.

jks

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.