Difference between revisions of "File.skip"
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| − | + | == Calling Pattern == | |
| + | Call | ||
| + | local f = sl.file(a,'read') | ||
| + | later: | ||
| + | local r = f.skip(n) | ||
| − | + | Arguments | |
| + | n is a number | ||
| − | + | Results | |
| + | r is of value EOF, nil, or true | ||
| − | + | == Example Usage == | |
| + | |||
| + | h = sl.file(getinstalldir()..'scripts/testread.dat', 'read') | ||
| + | local j = h.skip(4) -- skip first four stored values | ||
| + | print(tostring(j)) | ||
| + | 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 | ||
| + | |||
| + | --> true | ||
| + | val : 30 | ||
| + | val : TEST_ | ||
| + | val : true | ||
| + | val : false | ||
| + | val : null | ||
| + | val : true | ||
| + | val : 3.141622e-030 | ||
| + | val : table: 0x011da540 | ||
| + | val : EOF | ||
| + | |||
| + | == Description == | ||
| + | |||
| + | Skip jumps over the number of stored values specified by argument n. A positive n seeks from the current read location towards the end of the file, and negative n seeks towards the beginning of the file. If either the beginning or the end of the file is reached, [[EOF]] is returned. | ||
| + | |||
| + | == Upon Error == | ||
| + | |||
| + | Skip returns [[nil]] if there is a problem seeking over the file. | ||
== See Also == | == See Also == | ||
Latest revision as of 18:32, 15 July 2012
Calling Pattern
Call
local f = sl.file(a,'read')
later:
local r = f.skip(n)
Arguments
n is a number
Results
r is of value EOF, nil, or true
Example Usage
h = sl.file(getinstalldir()..'scripts/testread.dat', 'read')
local j = h.skip(4) -- skip first four stored values
print(tostring(j))
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
--> true
val : 30
val : TEST_
val : true
val : false
val : null
val : true
val : 3.141622e-030
val : table: 0x011da540
val : EOF
Description
Skip jumps over the number of stored values specified by argument n. A positive n seeks from the current read location towards the end of the file, and negative n seeks towards the beginning of the file. If either the beginning or the end of the file is reached, EOF is returned.
Upon Error
Skip returns nil if there is a problem seeking over the file.
