Here is my test code:
[lua]local nameTxt = native.newTextField( 0, 0, 160, 28)
nameTxt.text = “Ya??z’s iPhone”
for b=1, string.len(nameTxt.text),1 do
print(nameTxt.text:sub(b,b))
if nameTxt.text:sub(b,b) == “?” then
print(“FOUND”)
end
end[/lua]
I need to find some characters in text field. The output is:
Y
a
?
?
?
?
z
’
s
i
P
h
o
n
e
I think this is kind of a UTF-8 problem. Any idea to fix this problem? [import]uid: 5629 topic_id: 28074 reply_id: 328074[/import]
This is the solution:
[lua]utf8 ={
charbytes = function (s, i)
– argument defaults
i = i or 1
local c = string.byte(s, i)
– determine bytes needed for character, based on RFC 3629
if c > 0 and c <= 127 then
– UTF8-1
return 1
elseif c >= 194 and c <= 223 then
– UTF8-2
local c2 = string.byte(s, i + 1)
return 2
elseif c >= 224 and c <= 239 then
– UTF8-3
local c2 = s:byte(i + 1)
local c3 = s:byte(i + 2)
return 3
elseif c >= 240 and c <= 244 then
– UTF8-4
local c2 = s:byte(i + 1)
local c3 = s:byte(i + 2)
local c4 = s:byte(i + 3)
return 4
end
end
– returns the number of characters in a UTF-8 string
,len = function (s)
if(s~=nil) then
local pos = 1
local bytes = string.len(s)
local lenX = 0
while pos <= bytes and lenX ~= chars do
local c = string.byte(s,pos)
lenX = lenX + 1
pos = pos + utf8.charbytes(s, pos)
end
if chars ~= nil then
return pos - 1
end
return lenX
end
return 0
end
– functions identically to string.sub except that i and j are UTF-8 characters
– instead of bytes
,sub = function(s, i, j)
j = j or -1
if i == nil then
return “”
end
local pos = 1
local bytes = string.len(s)
local len = 0
– only set l if i or j is negative
local l = (i >= 0 and j >= 0) or utf8.len(s)
local startChar = (i >= 0) and i or l + i + 1
local endChar = (j >= 0) and j or l + j + 1
– can’t have start before end!
if startChar > endChar then
return “”
end
– byte offsets to pass to string.sub
local startByte, endByte = 1, bytes
while pos <= bytes do
len = len + 1
if len == startChar then
startByte = pos
end
pos = pos + utf8.charbytes(s, pos)
if len == endChar then
endByte = pos - 1
break
end
end
return string.sub(s, startByte, endByte)
end
– replace UTF-8 characters based on a mapping table
,replace = function(s, mapping)
local pos = 1
local bytes = string.len(s)
local charbytes
local newstr = “”
while pos <= bytes do
charbytes = utf8.charbytes(s, pos)
local c = string.sub(s, pos, pos + charbytes - 1)
newstr = newstr … (mapping[c] or c)
pos = pos + charbytes
end
return newstr
end
}[/lua] [import]uid: 5629 topic_id: 28074 reply_id: 113462[/import]