C#•3y ago

Struct with explicit layout

Hi, I am using Wintab and I am trying to make packet struct, but I have some problem. In some situations field x is uint but in others it's a int. Is there any option to determine if it's now uint or int or I need to have two fields - uint and int at the same offset

reflectronic•11/20/23, 8:28 PM

there is no harm in just choosing one

reflectronic•11/20/23, 8:30 PM

the physical representation of

int

int

and uintuint are identical. in fact, some mathematical operations like ++/

are also identical for

int

int

and uintuint (like, they do the same operations on the bits and return the same result)

reflectronic•11/20/23, 8:31 PM

if you use

int

int

in your struct, but you know that the number is unsigned in some particular instance, you can just cast it to uint (uint)struct.Count(uint)struct.Count and it will work correctly

reflectronic•11/20/23, 8:32 PM

the cast just affects the interpretation of the value by functions like

ToString()

ToString()

and operators like >>>>--it doesn't actually change the bits

PandettheOP•11/20/23, 8:48 PM

Oh, thank you

PandettheOP•11/20/23, 8:50 PM

Now I have two fields at the same offset in native struct, one int and one uint but for final app I am casting it to long to not overcomplicate it with every time checking if it's uint or int and then casting

PandettheOP•11/20/23, 8:50 PM

Do you think that will be fine or it's a terrible idea?

reflectronic•11/20/23, 8:54 PM

well. you definitely have to check wheher it's signed or unsigned before casting to longlong

reflectronic•11/20/23, 8:54 PM

it makes a big difference, whether the extra bits on top will be 1 (to preserve the negativeness) or 0

PandettheOP•11/20/23, 8:55 PM

I know

reflectronic•11/20/23, 8:55 PM

it seems fine to do that and then cast to long and just deal with long

PandettheOP•11/20/23, 8:58 PM

Thank you, that's all information I need

Struct with explicit layout

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