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Editorial Team
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Asked: 2026-05-27T19:52:04+00:00

I’m looking at a cursor control class that I’m trying to adapt for my

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I’m looking at a cursor control class that I’m trying to adapt for my program. I have it working as I wish, but I was unsure a little on what these numbers mean in this case. Can anybody shed any light on what the 0x01 etc mean. 

    private const int MouseEventMove = 0x01;
    private const int MouseEventLeftDown = 0x02;
    private const int MouseEventLeftUp = 0x04;
    private const int MouseEventRightDown = 0x08;
    private const int MouseEventRightUp = 0x10;
    private const int MouseEventAbsolute = 0x8000;

Thanks.

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  1. Editorial Team

    These are Flag enumerations.
    They are each given a value in powers of 2, so for any combined value, there will be no ambiguity about which of the flags are set.

    From MSDN:

    Flags enumerations are used for masking bit fields and doing bitwise
    comparisons. They are the correct design to use when multiple
    enumeration values can be specified at the same time.

    http://msdn.microsoft.com/en-us/library/ms229062.aspx

    In your particular case it seems that the enumeration describes what type of mouse event is occurring.

    Edit: As Hans points out, this is not technically an enumeration, but a group of const int definitions, though for all practical purposes I feel it serves as an enumeration – giving a human readable label for an integral value. Is there a more suitable name for this?

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