c++ - 获取字符数组的最后四个字符

Question

我有

TCHAR szPIDKEY[255];//for product id
 DWORD dwLen = sizeof(szPIDKEY)/sizeof(szPIDKEY[0]); //calculating the size of the key
UINT res = MsiGetProperty(hInstall, _T("PIDKEY"), szPIDKEY, &dwLen); 
if(res != ERROR_SUCCESS) 
{
    //fail the installation 
    return 1; 
}

关键字符串看起来像 xxxx-xxxx-xxxx-xxxx，我想只取 TCHAR 中的最后四个 xxxx，怎么办？

谢谢

Answer 1

 #ifndef UNICODE  
 typedef std::string String 
 #else
 typedef std::wstring String 
 #endif

String szKey = szPIDKEY;
size_t found = szKey.find_last_of("-");
String szFind = szKey.substr (found,4);