CODEWITHSUNDEEP
c++visual-c++
Amit
Amit

Reputation: 167

Detect Unicode Character in string

I have string input. I want to check all the characters and prompt the user if there is any Unicode character in input string.

How can I do this validation in C++.

eg. In Notepad if you enter any Unicode character and try to save it with ANSI Encoding, it will prompt about Unicode character. I want to do similar validation.

Upvotes: 3

Views: 8119

Answers (3)

user743414
user743414

Reputation: 936

You can use IsTextUnicode function. That's the function notepad uses as far as I know.

MSDN-Link: http://msdn.microsoft.com/en-us/library/windows/desktop/dd318672%28v=vs.85%29.aspx

Just insert NULL as the last parameter.

#include <string>
#include <Windows.h>

int main()
{
  std::string s = "Hallo!";
  std::wstring ws = L"Hello!";

  if (::IsTextUnicode(ws.c_str(), ws.length(), NULL) == 1)
  {
    // is unicode
    int i = 0;
  }
  else
  {
    // no unicode
    int i = 1;
  }

  return 0;
}

Upvotes: 3

MSalters
MSalters

Reputation: 180235

What Notepad warns you about is slightly different: It warns you about Unicode characters that cannot be converted to the desired code page. IOW, WideCharToMultiByte(CP_ACP, ..., &lpUsedDefaultChar) causes lpUsedDefaultChar to be set to TRUE.

Substitute CP_ACP for the encoding you want, except CP_UTF8 which makes no sense. UTF8 supports all Unicode characters.

Upvotes: 1

Some programmer dude
Some programmer dude

Reputation: 409442

An easy way is to allow Unicode and store the text as UTF-8. As UTF-8 is a superset of ASCII it's very easy to find characters which are not ASCII (they have the high bit set).

Upvotes: 1

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