c++读取REG_MULTI_SZ类型注册表

First: run RegQueryValueEx to get type and necessary memory size:

Single byte code:

 DWORD type, size;
 vector<string> target;
 if ( RegQueryValueExA(
     your_key, // HKEY
     TEXT("ValueName"),
     NULL,
     &type,
     NULL,
     &size ) != ERROR_SUCCESS )
   return;
 if ( type == REG_MULTI_SZ )
 {
   vector<char> temp(size);

   if ( RegQueryValueExA(
       your_key, // HKEY
       TEXT("ValueName"),
       NULL,
       NULL,
       reinterpret_cast<LPBYTE>(&temp[]),
       &size ) != ERROR_SUCCESS )
   return;

   size_t index = ;
   size_t len = strlen( &temp[] );
   while ( len >  )
   {
     target.push_back(&temp[index]);
     index += len + ;
     len = strlen( &temp[index] );
   }
 }

Unicode:

 DWORD type, size;
 vector<wstring> target;
 if ( RegQueryValueExW(
     your_key, // HKEY
     TEXT("ValueName"),
     NULL,
     &type,
     NULL,
     &size ) != ERROR_SUCCESS )
   return;
 if ( type == REG_MULTI_SZ )
 {
   vector<wchar_t> temp(size/sizeof(wchar_t));

   if ( RegQueryValueExW(
       your_key, // HKEY
       TEXT("ValueName"),
       NULL,
       NULL,
       reinterpret_cast<LPBYTE>(&temp[]),
       &size ) != ERROR_SUCCESS )
   return;

   size_t index = ;
   size_t len = wcslen( &temp[] );
   while ( len >  )
   {
     target.push_back(&temp[index]);
     index += len + ;
     len = wcslen( &temp[index] );
   }
 }