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If ‘-’ is supplied as a record name to any of the functions that
read or write header files, the ‘hea’ file is taken to be
the standard input or output, as appropriate. If the name of a signal
file is specified in the ‘hea’ file (or in the array of
WFDB_Siginfo objects passed to
osigfopen) as ‘-’, the
standard input (output) is used by
the name of an annotator is given in the array of
as ‘-’, the standard input (output) is used by
putann). If the name of a calibration file is given as
‘-’, the standard input (output) is used by
Under MS-DOS, these features may not always be usable, since the standard input and output are usually opened in “text” mode (which is unsuitable for binary database files).
Although the WFDB library does not forbid the use of the standard input or output for more than one function (e.g., as both a signal file and an annotation file), such use is in general a gross error that is likely to lead to unintended results.
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