String#convert

RPGzh500223

参考资料：libconv

RUBY 代码复制

class String
  ICONV = "iconv.dll"
 
  Iconv_open = Win32API.new(ICONV, 'libiconv_open', 'PP', 'L')
  Iconv_close = Win32API.new(ICONV, 'libiconv_close', 'L', 'L')
  Iconv_do = Win32API.new(ICONV, 'libiconv', 'LPPPP', 'L')
 
  def convert(dst_charset, src_charset = 'UTF-8')
    dst_str = "\0" * (self.size << 1)
    iconv_t = Iconv_open.call(dst_charset, src_charset)
    return if iconv_t == -1
    inbuf = [self].pack('p')
    inbytesleft = [self.size].pack('L')
    outbuf = [dst_str].pack('p')
    outbytesleft = [dst_str.size].pack('L')
    Iconv_do.call(iconv_t, inbuf, inbytesleft, outbuf, outbytesleft)
    Iconv_close.call(iconv_t) 
    return dst_str[0, dst_str.size - outbytesleft.unpack('L')[0]]
  end
 
  CallWndProc = Win32API.new('user32', 'CallWindowProc', 'PLLLL', 'L')
  GetProcAddress = Win32API.new('kernel32', 'GetProcAddress', 'LP', 'L')
  LoadLibrary = Win32API.new('kernel32', 'LoadLibrary', 'P', 'L')  
  HICONV = LoadLibrary.call(ICONV)  
  ProcAddr = [GetProcAddress.call(HICONV, 'libiconv_open'),
              GetProcAddress.call(HICONV, 'libiconv'),
              GetProcAddress.call(HICONV, 'libiconv_close')].pack('L3')
 
  CodeIconv = [85,139,236,139,69,8,139,28,69,16,0,0,0,139,83,4,255,114,12,
    139,19,255,114,12,139,69,20,139,28,69,12,0,0,0,62,137,93,20,255,19,131,
    196,8,131,248,255,116,110,62,137,69,8,139,125,12,209,231,131,199,8,255,
    55,255,119,4,139,117,16,209,230,131,198,8,255,54,255,118,4,87,131,199,
    4,87,86,131,198,4,86,62,255,117,8,139,93,20,255,83,4,131,196,20,139,93,
    16,143,4,93,12,0,0,0,143,4,93,8,0,0,0,139,93,12,143,4,93,12,0,0,0,88,
    43,4,93,8,0,0,0,137,4,93,8,0,0,0,80,62,255,117,8,139,93,20,255,83,8,
    131,196,4,88,201,194,16,0].pack('C*')
  def convert2(dst_charset, src_charset = 'UTF-8')
    dst_str = "\0" * (self.size << 1)
    bytes = CallWndProc.call(CodeIconv, [dst_charset, src_charset].object_id,
      dst_str.object_id, self.object_id, ProcAddr.object_id)
    dst_str
  end 
end

class String


  ICONV = "iconv.dll"


 


  Iconv_open = Win32API.new(ICONV, 'libiconv_open', 'PP', 'L')


  Iconv_close = Win32API.new(ICONV, 'libiconv_close', 'L', 'L')


  Iconv_do = Win32API.new(ICONV, 'libiconv', 'LPPPP', 'L')


 


  def convert(dst_charset, src_charset = 'UTF-8')


    dst_str = "\0" * (self.size << 1)


    iconv_t = Iconv_open.call(dst_charset, src_charset)


    return if iconv_t == -1


    inbuf = [self].pack('p')


    inbytesleft = [self.size].pack('L')


    outbuf = [dst_str].pack('p')


    outbytesleft = [dst_str.size].pack('L')


    Iconv_do.call(iconv_t, inbuf, inbytesleft, outbuf, outbytesleft)


    Iconv_close.call(iconv_t) 


    return dst_str[0, dst_str.size - outbytesleft.unpack('L')[0]]


  end


 


  CallWndProc = Win32API.new('user32', 'CallWindowProc', 'PLLLL', 'L')


  GetProcAddress = Win32API.new('kernel32', 'GetProcAddress', 'LP', 'L')


  LoadLibrary = Win32API.new('kernel32', 'LoadLibrary', 'P', 'L')  


  HICONV = LoadLibrary.call(ICONV)  


  ProcAddr = [GetProcAddress.call(HICONV, 'libiconv_open'),


              GetProcAddress.call(HICONV, 'libiconv'),


              GetProcAddress.call(HICONV, 'libiconv_close')].pack('L3')


 


  CodeIconv = [85,139,236,139,69,8,139,28,69,16,0,0,0,139,83,4,255,114,12,


    139,19,255,114,12,139,69,20,139,28,69,12,0,0,0,62,137,93,20,255,19,131,


    196,8,131,248,255,116,110,62,137,69,8,139,125,12,209,231,131,199,8,255,


    55,255,119,4,139,117,16,209,230,131,198,8,255,54,255,118,4,87,131,199,


    4,87,86,131,198,4,86,62,255,117,8,139,93,20,255,83,4,131,196,20,139,93,


    16,143,4,93,12,0,0,0,143,4,93,8,0,0,0,139,93,12,143,4,93,12,0,0,0,88,


    43,4,93,8,0,0,0,137,4,93,8,0,0,0,80,62,255,117,8,139,93,20,255,83,8,


    131,196,4,88,201,194,16,0].pack('C*')


  def convert2(dst_charset, src_charset = 'UTF-8')


    dst_str = "\0" * (self.size << 1)


    bytes = CallWndProc.call(CodeIconv, [dst_charset, src_charset].object_id,


      dst_str.object_id, self.object_id, ProcAddr.object_id)


    dst_str


  end 


end

String#convert2和String#convert都是调用DLL，前者效率稍高，至于DLL网上搜索下载即可
效率没有win32api快，但是支持的编码更多，具体可以看上面的链接

500字符的中文 UTF-8 转 GBK 测试 (具体次数好像和电脑性能相关，我的电脑 RMXP  Time无执行代码测试 21.9-22.2W次/秒)