CString, TCHAR, char* 的转换

CString, TCHAR, char* 的转换
转自：http://bboytaiwan.spaces.live.com/blog/cns!F712BFEC83D26022!975.entry




ANSI to Unicode:
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char *pAnsiString = "Some test string";
CString strUnicode = pAnsiString;
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如何把 char 转为lpctstr
mbstowcs---Convert a multi-byte(ANSI) string to wide character stirng(Unicode).
wcstombs---Convert a wide character string to multi-byte string.
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cstring TCHAR的互相转换


cstring－>TCHAR*的转化可以用函数GetBuff()
函数原型为：LPTSTR GetBuffer( int nMinBufLength );
cstring str("cstring");
TCHAR* szMsg = new TCHAR[100];
//其参数为cstring字符串的长度
szMsg = str.GetBuffer(str.GetLength());
str.ReleaseBuffer();
delete []szMsg;
szMsg = NULL;
TCHAR*－>cstring的转化
TCHAR szTchar[18] = L"TCHAR";
cstring str;
str.Format(_T("%s"),szTchar);
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Unicode to ANSI:


char* GetAnsiString(const CString &s)
{
int nSize = s.GetLength();
char *pAnsiString = new char[nSize+1];
wcstombs(pAnsiString, s, nSize+1);
return pAnsiString;
}
CString strUnicode = _T("Some test string");
char *pAnsiString = GetAnsiString(strUnicode);




注1：在上面例子中使用了wcstombs(pAnsiString, s, nSize+1);
程序编译时会提示：
warning C4996: 'wcstombs': This function or variable may be unsafe. Consider using wcstombs_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
而且上面的GetAnsiString函数似乎也有问题：返回了局域指针。因为我建立的是unicode工程，所以将上面函数改为：
string GetAnsiString(const wchar_t *s)
{
int iLength = (int)wcslen( s ) + 1;
const int size = 100;
char ansistring[size];
size_t iConverted = 0;
wcstombs_s( &iConverted, ansistring, iLength, s, _TRUNCATE );


return string(ansistring);
}
CString strUnicode = _T("Some test string");
string ansiString = GetAnsiString(strUnicode);




注2：关于ANSI和Unicode的关系，详见《VC++的Unicode编程》