Perfect. Thanks much. Charles Composed on a mobile: please excuse my brevity
Sam Siegel <[email protected]> wrote: >On Sat, Jul 27, 2013 at 4:52 AM, Charles Mills <[email protected]> wrote: > >> Am I correct in my reading of the C manuals? (I find the information >> somewhat scattered and oddly organized.) >> >> If I want to write a typical old-fashioned z/OS dataset in format VB and >> that contains binary fields in a field-oriented record layout, then (1) my >> only choice is to use fwrite() (or one of its variants) and (2) I would >> declare the struct and construct the record *without* the llbb control word >> and specify the length of the record (without the llbb) only in the >> fwrite()? >> > >you are correct. The fopen needs to specific "wb, type=record" or > "wb,type=record,recfm=*" or some other variant with the lrecl and blksize >specified if you want to control the dcb attributes from within your >program. The important part is the wb and type=record. > >Then the fwrite needs to specify the size to 1 and the count to the lenth >of the record not including the RDW length. > >for example fwrite( &structure, 1, recordLentth, outFile); >//where recordLength = amount of data to write. > >If recordLength > lrecl of file, record is truncated. > >See chapter 3 in the C/C++ Run-Time Library Reference SA22-7821 for details >about fwrite >Also see chapter 10 in the C/C++ Programming Guide SC09-4765 for details on >OS I/O operations. > >If there is no requirement to reposition the file using fseek, etc., >include the noseek parameter in the call to fopen. > > > > >> >> Charles >> >> ---------------------------------------------------------------------- >> For IBM-MAIN subscribe / signoff / archive access instructions, >> send email to [email protected] with the message: INFO IBM-MAIN >> > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
