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Using Bit Fields in C# Structs

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Wednesday, July 15, 2009 8:10 AM

  Hi! i'm writing an application (also converting some codes from C++ to C#) that needs to have a 1 Byte Struct with 8 fields, which means that each field is 1 bit. I know that in C++ i can declare the variable as (public int x:1) but i can't in C#. I get the idea of using structs instead of Unions but still i can't get the idea of declaring variables as bitfields. I tried to use FieldOffset attribute but either i can get them in 0 position or 1st position which also means a byte. I can overlap the variables but this time i can only use one of them. So please any ideas, any hints or leads to get me to the solution. i'm posting a code sniplet in case i couldn't make myself clear;

"i have this in C++;

typedef union

{

struct
    {   
        unsigned  StoredUser         :1;
        unsigned  SettingAllDiger      :1;
        unsigned  SettingAllBolgeler :1;
        unsigned  AnaLabel              :1;
        unsigned  ExtLabelAllExt1      :1;
        unsigned  ExtLabelAllExt2      :1;
        unsigned  None                 :2;   
    };

}VeriOkumaStatus_t;


and tried to convert to C#like this;



 [StructLayout(LayoutKind.Explicit,Size= 1)]

        struct VeriOkumaStatus_t
        {
            [FieldOffset(0)]
            public byte StoredUser;
            [FieldOffset(0)]
            public byte SettingAllDiger;
            [FieldOffset(0)]
            public byte SettingAllBolgeler;
            [FieldOffset(0)]
            public byte AnaLabel;
            [FieldOffset(0)]
            public byte ExtLabelAllExt1;
            [FieldOffset(0)]
            public byte ExtLabelAllExt2;
            [FieldOffset(0)]
            public byte None;

         }

All replies (2)

Wednesday, July 15, 2009 8:26 AM | 2 votes

Hi there,

You might want to have a look at the following link.

http://stackoverflow.com/questions/14464/bit-fields-in-c

Regards

Wednesday, July 15, 2009 8:36 AM

Thanx IvanRSA for the quick reply. I better focus at that, seems like what i've been trying to learn. Regards. Do It Your Way!