Tokenizing WCHAR string

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VS2005

How to tekenize the string returned in the below code

wchar_t m_VStrBuf[2048];

m_vNumChar=GetPrivateProfileString(_T("List1"),NULL,NULL,m_VStrBuf,2048,m_VFileName);

The buffer(m_VFileName) is filled with one or more null-terminated strings; the last string is followed by a second null character.

Posted 15-Nov-11 16:28pm

Selva K

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Chandrasekharan P 15-Nov-11 23:14pm

Do you know what is the separator??

3 solutions

Solution 1

You can use strtok(). like this

char * pch;

pch = strtok (m_VStrBuf,","); // Here , is seprator.
while (pch != NULL)
{
  pch = strtok (NULL, ",");
}

Note : To fetch value from file u have to stored the value with seprator.

Posted 15-Nov-11 17:29pm

LaxmikantYadav

Comments

Selva K 16-Nov-11 0:16am

Its not a char its wchar and the seperator is NULL

Solution 3

Assuming you want to keep the strings, you can use this (tested) function.

C++

void tokenise_wstr(const wchar_t * str, size_t len, 
               std::vector<std::wstring>& strings)
{
  size_t prev = 0;
  size_t next = wcslen(str);

  while ( (prev < next ) && (next < len))
  {
    strings.push_back(
      std::wstring(str + prev, str + next + 1));
    prev = next + 1;
    next = prev + wcslen(str + prev);
  }
}

Posted 15-Nov-11 23:25pm

Orjan Westin

Updated 15-Nov-11 23:28pm

v3

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Chuck O'Toole · Accepted Answer · 2011-11-15T18:34:00

Solution 2

wchar_t *ts;

ts = m_VFileName;
while (wcslen(ts) != 0)
{
  //process string ts
  ts += wcslen(ts) + sizeof(wchar_t);  // skip to next string in result buffer
}

Typed but not run / debugged (but it should be close)
[edit - skip over the null too]

Posted 15-Nov-11 18:34pm

Chuck O'Toole

Updated 16-Nov-11 5:26am

v2

Comments

Orjan Westin 16-Nov-11 5:30am

Almost - you need to increment with 1 to get past the \0 terminator, otherwise the second call will always return 0, since the first character is \0

Chuck O'Toole 16-Nov-11 11:27am

whoops, had that in my real code, forgot to type it here. Thanks, I updated the solution to reflect this.