C++幅文字列の切り取り例

ワイド文字列の例:
ヘッダファイル:

void WStringSplit( const std::wstring & wstr, std::vector<std::wstring> & tokens, const std::wstring & delimiters);

実装ファイル:

void WStringSplit( const std::wstring & wstr, vector<std::wstring> & tokens, const std::wstring & delimiters)
{
	// Skip delimiters at beginning.
	std::wstring::size_type lastPos = wstr.find_first_not_of(delimiters, 0);
	// Find first "non-delimiter".
	std::wstring::size_type pos = wstr.find_first_of(delimiters, lastPos);
	while (std::wstring::npos != pos || std::wstring::npos != lastPos)
	{
		// Found a token, add it to the vector.
		tokens.push_back(wstr.substr(lastPos, pos - lastPos));
		// Skip delimiters. 
		lastPos = wstr.find_first_not_of(delimiters, pos);
		// Find next "non-delimiter"
		pos = wstr.find_first_of(delimiters, lastPos);
	}
}

ワイド文字の使用方法:

			std::vector<std::wstring> tokens;
			std::wstring urlstr(buffer); 
			std::wstring delimiter(L"&");
			std::wstring tempstr;
			WStringSplit(urlstr, tokens, delimiter);

通常の文字列の例:
ヘッダファイル:

void StringSplit( const std::string & str, std::vector<std::string> & tokens, const std::string & delimiters);

実装ファイル:

void StringSplit( const std::string & str, vector<std::string> & tokens, const std::string & delimiters)
{
	// Skip delimiters at beginning.
	std::string::size_type lastPos = str.find_first_not_of(delimiters, 0);
	// Find first "non-delimiter".
	std::string::size_type pos = str.find_first_of(delimiters, lastPos);
	while (std::string::npos != pos || std::string::npos != lastPos)
	{
		// Found a token, add it to the vector.
		tokens.push_back(str.substr(lastPos, pos - lastPos));
		// Skip delimiters. 
		lastPos = str.find_first_not_of(delimiters, pos);
		// Find next "non-delimiter"
		pos = str.find_first_of(delimiters, lastPos);
	}
}

使用方法:

vector<string> tmp;
StringSplit(str, tmp, ",");
int size = tmp.size();