COM接口能否返回整数而不是长整数?

[Guid("xx")]
[ComVisible(true)]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IStudentItem
{
    string Type { get; set; }
    DateTime Week { get; set; }
    int Study { get; set; }
}

[Guid("yy")]
[ClassInterface(ClassInterfaceType.None)]
[ComVisible(true)]
public class StudentItem : IStudentItem
{
    public string Type { get; set; }
    public DateTime Week { get; set; }
    public int Study { get; set; }
}

正如你所见, Study 定义为 int .

long :

long lStudyNumber = 0;
if(SUCCEEDED(studentItem->get_Study(&lStudyNumber)))
    oEntry.iStudyPoint = static_cast<int>(lStudyNumber);

我的DLL有86x和64x两个版本。有没有办法拿到 get_Study 属性返回 integer