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vb 读取 unicode utf-8 编码文本文件问题???

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vb 读取 unicode utf-8 编码文本文件问题???[已结贴,结贴人:weitong918]

发表于：2007-05-09 14:47:27 楼主

在vb中使用objfso1.opentextfile 打开文本文件时,文件的打开方式为ansi,
现在需要处理的文件为unicode 或者 utf-8 编码方式,请问应该如何处理?

谢谢!!

发表于：2007-05-09 15:00:581楼得分:5

http://www.chenoe.com/blog/article.asp?id=2030

发表于：2007-05-09 15:11:462楼得分:10

模块 module_utf8

option explicit

public m_bisnt as boolean

public declare function widechartomultibyte lib "kernel32 " （byval codepage as long, byval dwflags as long, byval lpwidecharstr as long, byval cchwidechar as long, byref lpmultibytestr as any, byval cchmultibyte as long, byval lpdefaultchar as string, byval lpuseddefaultchar as long) as long
public declare function multibytetowidechar lib "kernel32 " （byval codepage as long, byval dwflags as long, byref lpmultibytestr as any, byval cchmultibyte as long, byval lpwidecharstr as long, byval cchwidechar as long) as long
public declare sub copymemory lib "kernel32 " alias "rtlmovememory " （lpvdest as any, lpvsource as any, byval cbcopy as long)

public const cp_utf8 = 65001

'purpose:convert utf8 to unicode
public function utf8_decode（byval sutf8 as string) as string

dim lngutf8size as long
dim strbuffer as string
dim lngbuffersize as long
dim lngresult as long
dim bytutf8（) as byte
dim n as long

if lenb（sutf8) = 0 then exit function
m_bisnt = true ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' add ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
if m_bisnt then
on error goto endfunction
bytutf8 = strconv（sutf8, vbfromunicode)
lngutf8size = ubound（bytutf8) + 1
on error goto 0
'set buffer for longest possible string i.e. each byte is
'ansi, thus 1 unicode（2 bytes)for every utf-8 character.
lngbuffersize = lngutf8size * 2
strbuffer = string$（lngbuffersize, vbnullchar)
'translate using code page 65001（utf-8)
lngresult = multibytetowidechar（cp_utf8, 0, bytutf8（0), _
lngutf8size, strptr（strbuffer), lngbuffersize)
'trim result to actual length
if lngresult then
utf8_decode = left$（strbuffer, lngresult)
end if
else
dim i as long
dim topindex as long
dim twobytes（1) as byte
dim threebytes（2) as byte
dim abyte as byte
dim tstr as string
dim barray（) as byte

'resume on error in case someone inputs text with accents
'that should have been encoded as utf-8
on error resume next

topindex = len（sutf8) ' number of bytes equal topindex+1
if topindex = 0 then exit function ' get out if there 's nothing to convert
barray = strconv（sutf8, vbfromunicode)
i = 0 ' initialise pointer
topindex = topindex - 1
' iterate through the byte array
do while i <= topindex
abyte = barray（i)
if abyte < &h80 then
' normal ansi character - use it as is
tstr = tstr & chr$（abyte): i = i + 1 ' increment byte array index
elseif abyte > = &he0 then 'was = &he1 then
' start of 3 byte utf-8 group for a character
' copy 3 byte to threebytes
threebytes（0) = barray（i): i = i + 1
threebytes（1) = barray（i): i = i + 1
threebytes（2) = barray（i): i = i + 1
' convert byte array to utf-16 then unicode
tstr = tstr & chrw$（（threebytes（0) and &hf) * &h1000 + （threebytes（1) and &h3f) * &h40 + （threebytes（2) and &h3f))
elseif （abyte > = &hc2) and （abyte <= &hdb) then
' start of 2 byte utf-8 group for a character
twobytes（0) = barray（i): i = i + 1
twobytes（1) = barray（i): i = i + 1
' convert byte array to utf-16 then unicode
tstr = tstr & chrw$（（twobytes（0) and &h1f) * &h40 + （twobytes（1) and &h3f))
else
' normal ansi character - use it as is
tstr = tstr & chr$（abyte): i = i + 1 ' increment byte array index
end if
loop
utf8_decode = tstr ' return the resultant string
erase barray
end if

endfunction:

end function

发表于：2007-05-09 15:12:073楼得分:10

接上

'purpose:convert unicode string to utf-8.
public function utf8_encode（byval strunicode as string, optional byval bhtml as boolean = true) as string
dim i as long
dim tlen as long
dim lptr as long
dim utf16 as long
dim utf8_encodelong as string

tlen = len（strunicode)
if tlen = 0 then exit function

if m_bisnt then
dim lngbuffersize as long
dim lngresult as long
dim bytutf8（) as byte
'set buffer for longest possible string.
lngbuffersize = tlen * 3 + 1
redim bytutf8（lngbuffersize - 1)
'translate using code page 65001（utf-8).
lngresult = widechartomultibyte（cp_utf8, 0, strptr（strunicode), _
tlen, bytutf8（0), lngbuffersize, vbnullstring, 0)
'trim result to actual length.
if lngresult then
lngresult = lngresult - 1
redim preserve bytutf8（lngresult)
'copymemory strptr（utf8_encode), bytutf8（0&), lngresult
utf8_encode = strconv（bytutf8, vbunicode)
' for i = 0 to lngresult
' utf8_encode = utf8_encode & chr$（bytutf8（i))
' next
end if
else
for i = 1 to tlen
' get utf-16 value of unicode character
lptr = strptr（strunicode) + （（i - 1) * 2)
copymemory utf16, byval lptr, 2
'convert to utf-8
if utf16 < &h80 then ' 1 utf-8 byte
utf8_encodelong = chr$（utf16)
elseif utf16 < &h800 then ' 2 utf-8 bytes
utf8_encodelong = chr$（&h80 + （utf16 and &h3f)) ' least significant 6 bits
utf16 = utf16 \ &h40 ' shift right 6 bits
utf8_encodelong = chr$（&hc0 + （utf16 and &h1f)) & utf8_encodelong ' use 5 remaining bits
else ' 3 utf-8 bytes
utf8_encodelong = chr$（&h80 + （utf16 and &h3f)) ' least significant 6 bits
utf16 = utf16 \ &h40 ' shift right 6 bits
utf8_encodelong = chr$（&h80 + （utf16 and &h3f)) & utf8_encodelong ' use next 6 bits
utf16 = utf16 \ &h40 ' shift right 6 bits
utf8_encodelong = chr$（&he0 + （utf16 and &hf)) & utf8_encodelong ' use 4 remaining bits
end if
utf8_encode = utf8_encode & utf8_encodelong
next
end if

'substitute vbcrlf with html line breaks if requested.
if bhtml then
utf8_encode = replace$（utf8_encode, vbcrlf, " <br/> ")
end if

end function

form中:

private sub command1_click（)
dim str_utf8 as string
dim str_unicode as string
open "path " for input as 1
str_utf8 = strconv（inputb$（lof（1), 1), vbunicode) '读到字符串
str_utf8 = right（str_utf8, len（str_utf8) - 1) '第一个字符是格式标志，无实际意义，去掉
close 1
module_utf8.m_bisnt = true
str_unicode = utf8_decode（str_utf8) '转换为unicode
msgbox str_unicode
end sub

发表于：2007-05-09 15:16:394楼得分:10

刚才试着打开 rainstormmaster（暴风雨 v2.0) 给的网页

出现病毒???...

发表于：2007-05-09 15:19:485楼得分:10

to all:
zyl910的专栏给出了目前中国最好的vb读文本文件的sorce code.
http://blog.csdn.net/zyl910/archive/2006/05/30/762693.aspx

另外，
http://www.chenoe.com/blog/article.asp?id=2030也是转自zyl910

to rose2007（):
在英文windows中，这一句有问题：
bytutf8 = strconv（sutf8, vbfromunicode)
最好用copymemory.
good luck!

发表于：2007-05-09 15:26:276楼得分:0

我的是转自坛里一个星星的忘记他id了...
目前测试正常
谢谢vbadvisor（sunlight)的指点我看下...

发表于：2007-05-09 15:29:477楼得分:0

这么长~~
你那个文件是utf-8的嘛

一般新建的txt都是unicode的.

所以才会是12个字节.

要读的方法多了去了~~~~~连我所知道的就有两种.

这里给你一种简单的:

public function readfile（byval filename as string) as string
dim objstream as object
set objstream = createobject（ "adodb.stream ")

with objstream
.type = 2
.mode = 3
.open
.charset = "utf-8 " '不同编码时自己换
.loadfromfile filename
readfile = .readtext
.close
end with
end function

直接调用readfile（ "tmp1.txt "),返回值就是它的内容了.

我用这个好象也可以,谢谢了~~

发表于：2007-05-09 15:31:288楼得分:0

这么长~~
你那个文件是utf-8的嘛
================================

你测试了吗? 怎么知道不是?

发表于：2007-05-09 15:32:379楼得分:5

http://community.csdn.net/expert/topic/5515/5515190.xml?temp=.4686853

发表于：2007-05-09 15:33:0510楼得分:0

.............................................

发表于：2007-05-09 15:36:3411楼得分:0

晕死,居然不让我结贴~
csdn改规则了???

发表于：2007-05-09 15:40:2912楼得分:0

rose2007（) 不好意思,你误会了,

这下面的话是我从别的帖子转方法的时候,上面的一句话~~ 没注意也转过来了~~ 呵呵.
不是说你上面的方法~ 不好意思哦~ 谢谢!
-----------------------

你那个文件是utf-8的嘛

一般新建的txt都是unicode的.
---------------

发表于：2007-05-09 15:42:2213楼得分:0

http://www.chenoe.com/blog/article.asp?id=2030

想看这个网站
怎么总有病毒...

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