[vtkusers] vtkUnicodeString::from_utf8(): not a valid UTF-8 string.

[David Gobbi]

Hi Jose,

I have a function that efficiently converts latin1 to utf-8 (it's part of
my DICOM code):

  std::string convertLatin1ToUTF8(const char *text)
  {
    // latin1, codepage is identity
    const char *cp = text;
    size_t m = l;
    // compute the size of the UTF-8 string
    for (size_t n = 0; n < l; n++)
      {
      m += static_cast<unsigned char>(*cp++) >> 7;
      }
    cp = text;
    std::string s;
    s.resize(m);
    // encode as UTF-8
    size_t i = 0;
    while (i < m)
      {
      while (i < m && (*cp & 0x80) == 0)
        {
        s[i++] = *cp++;
        }
      if (i < m)
        {
        int code = static_cast<unsigned char>(*cp++);
        s[i++] = (0xC0 | (code >> 6));
        s[i++] = (0x80 | (code & 0x3F));
        }
      }
      return s;
  }


On Wed, Aug 19, 2015 at 7:18 AM, Jose Barreto <jose.de.paula at live.com>
wrote:

> Thank you David,
> It works here.
> I'm leaving two methods in a file if someone needs to use too.
> A String ^ converts to char * and other formats for UTF-8.
>
> maniputação_String_VTK.txt
> <
> http://vtk.1045678.n5.nabble.com/file/n5733560/maniputa%C3%A7%C3%A3o_String_VTK.txt
> >
>
>
>
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