Getting char * from timestamp in a composite type

[Michael Akinde <michael.akinde@xxxxxx>]

Hi,

I need to extract a text string representation of a timestamp from a 
user-defined row type; e.g., from the composite type ('1980-01-01 
12:00:00', 'Random Comment'), I'd like to extract the C string 
1980-01-01 12:00:00 in my user-defined C function.

As I understand it, I should be able to do something like (assuming 
"time" is the attribute name):

   bool isNull;
   HeapTupleHeader t = DatumGetHeapTupleHeader(row);
   Datum var = GetAttributeByName( row, "time", & isNull );
   // Check for null
   char * ret = DatumGetCString( DirectFunctionCall1(textout, var ) );

However, the code above (and every other variant I've tried) invariable 
segmentation faults the postmaster. so obviously I am doing something 
wrong. Can someone explain (or point to an example that works) of how to 
do this?

Regards,

Michael A.

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