static void DemoStructMarshallingByRef()
{
var time = new SystemTimeStruct();
GetSystemTime(out time);
Console.WriteLine($"The time is {time}");
}
static void DemoStructMarshallingByValue()
{
var time = new SystemTimeStruct();
GetSystemTime(time); // the changes won't be reflected because the struct is passed by value
Console.WriteLine($"The time is {time}");
}
static extern void GetSystemTime(out SystemTimeStruct time); // would also work with ref
static extern void GetSystemTime(SystemTimeStruct time); // this won't work because GetSystemTime requires an argument that can be copied out (i.e. at least an out variable)