安全版字符串操作函数

Strsafe.h function	Replaces
StringCchCat StringCchCatEx	strcat, wcscat
StringCchCatN StringCchCatNEx	strncat
StringCchCopy StringCchCopyEx	strcpy, wcscpy
StringCchCopyN StringCchCopyNEx	strncpy
StringCchGets StringCchGetsEx	gets, _getws
StringCchPrintf StringCchPrintfEx	sprintf, swprintf, wsprintf, _snprintf, _snwprintf
StringCchVPrintf StringCchVPrintfEx	vsprintf, vswprintf, _vsnprintf, _vsnwprintf
StringCchLength	strlen