Difference between revisions of "File.readnext"
From OpenEUO
(Created page with "== Calling Pattern == Call local f = sl.file(a,b) local r = f.readnext() Results r is of type EOF,nil,null,boolean,number,string, or table == Example Usage == h = sl.file(...") |
(→Example Usage) |
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| Line 10: | Line 10: | ||
== Example Usage == | == Example Usage == | ||
| − | h = sl.file(getinstalldir()..'scripts/testread.dat', 'read') | + | h = sl.file(getinstalldir()..'scripts/testread.dat', 'read') |
| − | local val = true | + | local val = true |
| − | while val ~= nil and val ~= 'EOF' do | + | while val ~= nil and val ~= 'EOF' do |
| − | + | val = h.readnext() | |
| − | + | if val == sl.null then val = 'null' end | |
| − | + | if val == sl.EOF then val = 'EOF' end | |
| − | + | print('val : '..tostring(val)) | |
| − | end | + | end |
--> val : 38.333412345 | --> val : 38.333412345 | ||
Latest revision as of 18:39, 27 November 2010
Calling Pattern
Call
local f = sl.file(a,b)
local r = f.readnext()
Results
r is of type EOF,nil,null,boolean,number,string, or table
Example Usage
h = sl.file(getinstalldir()..'scripts/testread.dat', 'read')
local val = true
while val ~= nil and val ~= 'EOF' do
val = h.readnext()
if val == sl.null then val = 'null' end
if val == sl.EOF then val = 'EOF' end
print('val : '..tostring(val))
end
--> val : 38.333412345
val : null
val : null
val : null
val : 30
val : TEST_
val : true
val : false
val : null
val : true
val : 3.141622e-030
val : table: 0x011da540
val : EOF
Description
Readnext reads the next value stored in the associated file. If there are no more values (readnext has reached the end of the file), then readnext returns EOF. Nils written to a file are stored and returned as null.
Upon Error
Readnext returns nil if there is a problem reading a value.
See Also
- file.readnext
