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C# why sizeof is unsafe and how to get size of a struct in a safe way?


C# why sizeof is unsafe and how to get size of a struct in a safe way?

By : Guilherme Cesar Mede
Date : October 28 2020, 04:55 PM
I hope this helps . There is no way to do it for managed structs. Marshal.SizeOf will only return the size of the data on the marshaled types that comprise the struct... that MIGHT be correct for the managed types on some platforms, but not on others.
This is by design so the JIT can lay structs differently depending on the platform it runs on.
code :


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size of struct without use sizeof keyword

size of struct without use sizeof keyword


By : hai.ntiris
Date : March 29 2020, 07:55 AM
hope this fix your issue here is code which returns size of struct without using sizeof keyword , The cast here happens after the ++
code :
p2 = (unsigned char *)++ppt;
C/C++: size of a typedef struct containing an int and enum == sizeof(int)?

C/C++: size of a typedef struct containing an int and enum == sizeof(int)?


By : Barmesh
Date : March 29 2020, 07:55 AM
I wish this helpful for you I am using gcc version 4.3.3 on my Ubuntu (i686). I have written a stripped down test program to describe my lack of understanding and my problem. The program shall tell me the size of the struct, which I implemented. So I have a typedef struct for a Message and a little main to play around: , You are not declaring anything with:
code :
enum {token=0x123456};
typedef struct {
    int size; 
    int; 
} Message;
typedef struct {
    int size; 
    enum {token=0x123456} e; 
} Message;
struct Message {
    int size; 
    int token;
    Message() : token(0x123456) {}; 
};
struct Message {
    int size; 
    int token=0x123456;
};
Why sizeof of a struct is unsafe

Why sizeof of a struct is unsafe


By : MoorthY KS
Date : March 29 2020, 07:55 AM
Any of those help
I would like to know why using sizeof in this context is considered unsafe.
How to get the size of a user defined struct? (sizeof)

How to get the size of a user defined struct? (sizeof)


By : Jude Botchwey
Date : March 29 2020, 07:55 AM
With these it helps I've got a structure with C representation: , For two reasons:
code :
fn main() {
    use std::mem;
    assert_eq!(4, mem::size_of::<i32>());
}
mem::size_of::<Scard_IO_Request>()
How to use syscalls correctly in go (different results from Go unsafe.Sizeof vs C sizeof)

How to use syscalls correctly in go (different results from Go unsafe.Sizeof vs C sizeof)


By : Jackie Vititoe-Garre
Date : March 29 2020, 07:55 AM
To fix this issue The go compiler and the C compiler are handling alignment differently.
In C the structure has been aligned to 16 bytes (adding a 4 bytes slack space after id or before it). The go compiler instead packed the fields without adding any slack space.
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