char s1[] = "中文ABC";

wchar_t s2[] = L"中文ABC";

1.sizeof() /*獲取字符數(shù)組的字節(jié)數(shù)（包括結(jié)束符0）*/

         sizeof(s1) = 8;ANSI

         sizeof(s2) = 12;UNICODE

2.strlen/wcslen /*采取0作為字符串的結(jié)束符,，并返回不包括0在內(nèi)的字符數(shù)目*/

         strlen(s1) = 7;ANSI

         wcslen(s2) = 5;UNNICODE

3.GetLenth() /*返回字符而非字節(jié)數(shù)目*/

         CStringA sa = s1;ANSI

         CStringW sw = s2;UNICODE

         sa.GetLength() = 7;

         sw.GetLength() = 5;

4.size()與GetLength()一樣

5.length() /*獲取字符數(shù)目的最佳方案*/

         _bstr_t::length();

         _bstr_t bs1 = s1;

         _bstr_t bs2 = s2;

         bs1.length() = 5;ANSI

         bs2.length() = 5;UNICODE