2.19: TQOPNA

TOCGroup 1TQWSTRTQOPNBGroup 2A-ZGroup 1

OPEN-ASCII-DATA-FILE

Use TQOPNA to open a thermochemical data-file in ASCII format for reading by ChemApp.

Added for ChemApp version 3.3.0

Synopsis

FORTRAN: CALL TQOPNA(NAME,UNIT,NOERR)

C: tqopna(name,unit,&noerr);

Pascal: tqopna(name,unit,noerr);

Basic: Call tqopna(name,unit,noerr)


Name Type Value set on call or returned
NAME CHARACTER Set to the filename of the ASCII data-file to open
UNIT CHARACTER Set to the unit number under which it should be opened
NOERR INTEGER Returns an error number

Use TQOPNA to open a thermochemical data-file in ASCII format for reading. If you are using ChemApp V3.3.0 or above, it is recommended that you use TQOPNA instead of TQOPEN. The advantage of TQOPNA over TQOPEN is that TQOPNA only opens the data-file if it already exists, otherwise it reports error no. 107.

The unit number under which the data-file needs to be opened should normally be determined in advance using a call to TQGIO with the option 'FILE'.

A file that has been opened using TQOPNA should subsequently be closed only with TQCLOS.

FORTRAN programmers may use the standard OPEN statement instead of TQOPNA, if ChemApp is used as a static library.

TQOPNA cannot be used to open binary thermochemical data-files. For this purpose, use TQOPNB instead. To open ASCII files for writing, for instance to store the output of TQCEL, TQMAPL, and TQSHOW, use TQOPEN instead.

Please also see chapter 1.11 for details and differences of thermochemical data-files formats.

See also

TQOPNB, TQOPNT, TQCLOS, TQRFIL, TQOPEN, Chapter 1.11

Examples

See TQRFIL


ChemApp Programmer's Manual, Edition 3.6© GTT-Technologies, 2003