I managed to use generics via Marshal.PtrToStructrue and Marshal.StructureToPtr
but these do not perform as good as the explicit methods (without using
generics).
static unsafe T BytesToStruct<T>(byte[] arr) where T : struct
{
T t;
fixed (byte* parr = arr)
{
t = (T)Marshal.PtrToStructure((IntPtr)parr, typeof(T));
}
return t;
}
static unsafe byte[] StructToBytes<T>(T t) where T : struct
{
byte[] arr = new byte[Marshal.SizeOf(typeof(Header))];
fixed (byte* parr = arr)
{
Marshal.StructureToPtr(t, (IntPtr)parr, false);
}
return arr;
}
-----Original Message-----
From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf
Of עידו שמואלסון
Sent: Tuesday, November 15, 2005 9:08 AM
To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM
Subject: [ADVANCED-DOTNET] Generics and 'fixed'
Hi,
I'm have a code that converts a struct to byte[] and vise versa. When I tried
to upgrade it to accept any struct using generics (<T> … where : struct)
I get the following compile error:
Cannot take the address of, get the size of, or declare a pointer to a managed
type ('T')
Here is my code sample:
static unsafe Header BytesToHeader(byte[] arr)
{
Header header;
fixed (byte* parr = arr)
{
header = *((Header*)parr);
}
return header;
}
static unsafe byte[] HeaderToByte(Header header)
{
byte[] arr = new byte[sizeof(Header)];
fixed (byte* parr = arr)
{ *((Header*)parr) = header; }
return arr;
}
static unsafe T BytesToHeader<T>(byte[] arr) where T : struct
{
T t;
fixed (byte* parr = arr)
{
t = *((T*)parr); // -- > compile error
}
return t;
}
struct Header
{
public int A;
}
Best Regards,
Ido Samuelson
Senior Consultant
Advantech – Microsoft Division (Magen)
[EMAIL PROTECTED]
===================================
This list is hosted by DevelopMentor® http://www.develop.com
View archives and manage your subscription(s) at http://discuss.develop.com
===================================
This list is hosted by DevelopMentor® http://www.develop.com
View archives and manage your subscription(s) at http://discuss.develop.com
