| |
CImage:KwdGetDmsEx
The KwdGetDmsEx method returns a DMS (Degrees, Minutes, and Seconds) string for a keyword in the image header. Also returned is a status flag which indicates whether the keyword was present. Use this method to read a keyword not in the standard angle format which uses : as the field delimiter. To return a keyword value specified in hours, minutes, and seconds, use KwdGetHmsEx The related KwdGetDMS method returns the DMS value without a status flag.
|
sDMSValue, bSuccess = CImage:KwdGetDmsEx( sKwd ) |
sKwd is the keyword name.
sDMSValue is the returned value of the keyword
sKwd .
On success,
bSuccess is true.
On failure,
bSuccess is false and sDMSValue
is nil.
This method returns a properly formatted angle string after reading a keyword value containing degrees, minutes, and seconds ("DMS"). The DMS string may contain the following field delimiters:
space, comma, colon, hyphen, slash, D, d, M, m, S, s, °, ', "
A preceding minus sign (or hyphen) is handled properly but embedded hyphens are treated as delimiters. The result is formatted into a standard angle string of the form +ddd:mm:ss.sss. The sign is returned only if the angle is negative.
If the specified keyword does not exist, then 0:00:00.000 is returned. To test whether the keyword exists, call KwdExists before this method.
Suppose a CImage named I exists and contains the keyword "SITELONG" which has a value in the format '-14 24 16.4'. The following script returns the value formatted as "-14:24:16.4":
|
sLong, bFound = I:KwdGetDmsEx("SITELONG") |
-- read the keyword value |
|
if bFound then |
|
|
Printf( "Site Longitude= '%s'", sLong ) |
-- prints Local Hour Angle = -14:24:16.400 |
|
else |
|
|
Printf( "Site Longitude not found" ) |
-- SITELONG was not found |
|
end |
|