Magellan DirectRoute 3.0 Bedienungsanleitung PDF herunterladen (Seite 119)

GPS-

Ba-

bel

XCSV

Style

Files

104

to map the internal GPSBabel "description" variable to two or more fields on output). For all practical

purposes, IFIELDS and OFIELDS are defined the same way in the style file.

The following per-field options are defined:

• "no_delim_before" is supported on in OFIELD tags to specify that this field should be written without

a field delimiter before it. It's useful for limited field concatenation.

• "absolute" is supported on OFIELD tags for lat and lon to indicate that only absolute values (never

negative) are to be printed.

• "optional" is supported only OFIELD tags and indicates that the field may or may not be available in

the source data. If the field is absent, no trailing field separator is written.

This attribute is most useful when paired with "no_delim_before" as it allows you to concatenate fields

without concern for whether those fields are actually populated or not.

There are several different types of fields that may be defined. Each field consists of three pieces of infor-

mation: the FIELD TYPE, a DEFAULT VALUE, and a PRINTF CONVERSION (for output). In many

cases, not all pieces are used, but all 3 pieces are required. Additionally, an fourth field is supported that

modifies the behaviour of the field being described.

FIELDS should be defined in the style file in the logical order that they appear in the data, from left to

right. This is the order in which they are parsed from input and written to output.

The fields used by the XCSV parser are as follows:

IGNORE

IGNORE fields are, guess what, ignored on input. Internally, IGNORE fields are treated as CHARACTER

data, and as such, require a printf conversion for a character array.

examples:

IFIELD IGNORE,"","%14.14s" # (writes a 14 character blank field)

IFIELD IGNORE,"","%s" # (writes a blank field on output)

CONSTANT

CONSTANT fields are, of course, constant. They are ignored on input, however they write CONSTANT

data on output. As such, they require a DEFAULT VALUE and a printf conversion for a character array.

examples:

IFIELD CONSTANT,"FFFFFF","%s" # (writes "FFFFFF" in the field)

IFIELD CONSTANT,"01/01/70","%s" # (a constant date field)

INDEX

An INDEX field is used ONLY on output. The INDEX constant defines a field that, at output, contains the

sequence number of the waypoint being written, starting at 0. An index is managed internally as an INTE-

GER and requires an INTEGER printf conversion. An INDEX has one special property. The DEFAULT

VALUE of the index is added to the index on each iteration (to allow indexes starting at 1, 100, etc..).

examples:

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 129 130

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