I frequently use _Rreadk with a partial key, assuming that the first part is 
known. Never had any problems. Not sure, that what Ulrich writing is correct. 
At least I never did like that. 
_Rreadk definition is as follows:
_RIOFB_T *_Rreadk(_RFILE *fp, void *buf, size_t size, int opts, void *key, int 
keylen)

You just set "key" variable to your sequence number, "keylen" variable must 
keep partial key length - not the complete one.
"key" variable size is "keylen" - I never made it larger....
Variable "opts" I usually set first to __KEY_EQ and then to __KEY_NEXTEQ.

If you are still in trouble, give some more details...

Jevgeni.



> -----Original Message-----
> From: Adam Walker [mailto:adamwalker79@xxxxxxxxxxx]
> Sent: Friday, January 07, 2005 12:50 PM
> To: c400-l@xxxxxxxxxxxx
> Subject: [C400-L] using _Rreadk with a partial key - any examples?
> 
> 
> Hi there,
>  
> I am accessing a logical file keyed over the first four 
> fields.  however, I only know the first field of the key that 
> I need to access.  This field is a unique seq number so 
> should be sufficient to locate the correct record, and the 
> documentation for _Rreadk states it can use a partial key, 
> but I am not able to successfully retrieve a record unless I 
> build the complete key (which I can do in test, but not reality).
> Ideally there would be a logical keyed over just the unique 
> seq number, but there isn't and I don't want to add one 
> unless theres no other way.
>  
> Is there anyone out there who has used _Rreadk with a partial 
> key successfully?  would you mind providing an example of how 
> the key was built (compared to a complete key) and the _Rreadk params?
>  
> thanks to anyone who can help,
>  
> - Adam
> 
>               
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