I want to cast a class into a byte array. I've seen some examples of this
floating around, but they all have simple data members. What happens if I
cast something that has a ArrayList or an Array?? Does it loop through the
array and cast them all and I end up with a big array (This is what I hope
will happen)? Or does it simple cast the pointer address and I end up with a
small array??
Related question: How do I make sure everything in the class (including
member variables that are subclasses) are included in this cast?? And if I
try to cast back from a byte array, will I get back everything as it was??
I haven't started in on this project yet, so I can't say as I've tried any
of this..
GE 3 1550
> I want to cast a class into a byte array. I've seen some examples of this floating around, but they all have simple data members. What happens if I cast something that has a ArrayList or an Array?? Does it loop through
the array and cast them all and I end up with a big array (This is what I hope will happen)? Or does it simple cast the pointer address and I end up
with a small array??
Related question: How do I make sure everything in the class (including member variables that are subclasses) are included in this cast?? And if
I try to cast back from a byte array, will I get back everything as it was??
I haven't started in on this project yet, so I can't say as I've tried any of this..
Are we talking about managed ref types here? If so, you should *never* do
this, you're won't get what you expect, and you're likely to end up
corrupting the managed heap if you manipulate it this way.
Why do you need to do this? If you're trying to call into native code
passing this, then there are appropriate methods for this (P/Invoke,
StructLayout, etc).
If you're trying, for example, to save the contents of the class to disk or
something like that, then using Serialization and the Serialization
formatters (e.g. BinaryFormatter ) are the way to go.
--
Tomas Restrepo to****@mvps.org
I'm using only managed types.
In a nut shell, I'm trying to send whole classes across the network using
the socket class. The socket class only sends and received using Byte Arrays
(__gc array). I *THINK* i've seen some examples of ppl casting a class into
a byte array, sending it, then casting it back into the class on the other
end. I say I think because I was looking for something else when I came
across it, and it was a fair amount ago.
I have to cast into a byte array. I have no choice. I do want to make sure
i get back what I want though. And If I can avoid having to write a whole
bunch of functions to create a byte array, I would be very happy :)
GE
"Tomas Restrepo (MVP)" wrote: I want to cast a class into a byte array. I've seen some examples of this floating around, but they all have simple data members. What happens if I cast something that has a ArrayList or an Array?? Does it loop through the array and cast them all and I end up with a big array (This is what I hope will happen)? Or does it simple cast the pointer address and I end up with a small array??
Related question: How do I make sure everything in the class (including member variables that are subclasses) are included in this cast?? And if I try to cast back from a byte array, will I get back everything as it was??
I haven't started in on this project yet, so I can't say as I've tried any of this..
Are we talking about managed ref types here? If so, you should *never* do this, you're won't get what you expect, and you're likely to end up corrupting the managed heap if you manipulate it this way.
Why do you need to do this? If you're trying to call into native code passing this, then there are appropriate methods for this (P/Invoke, StructLayout, etc).
If you're trying, for example, to save the contents of the class to disk or something like that, then using Serialization and the Serialization formatters (e.g. BinaryFormatter ) are the way to go.
-- Tomas Restrepo to****@mvps.org
Fireangel, I'm using only managed types.
In a nut shell, I'm trying to send whole classes across the network using the socket class. The socket class only sends and received using Byte
Arrays (__gc array). I *THINK* i've seen some examples of ppl casting a class
into a byte array, sending it, then casting it back into the class on the other end. I say I think because I was looking for something else when I came across it, and it was a fair amount ago.
That's common unmanaged C++ practice, but won't really do the trick in
managed code. I have to cast into a byte array. I have no choice. I do want to make
sure i get back what I want though. And If I can avoid having to write a whole bunch of functions to create a byte array, I would be very happy :)
Serialization is your friend. Basically, all you'd need to do is mark your
managed types as [ Serializable ] and use the BinaryFormatter class to
serialize it into a stream and deserialize them from a string.
There are plenty of examples of this on the net...
That said, since it seems you have control of both client and server, why
invent your own protocol? Just use .NET remoting and be done with it....
--
Tomas Restrepo to****@mvps.org This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Ekim |
last post by:
hello,
I'm allocating a byte-Array in C# with byte byteArray = new byte;
Now I want to pass this byte-Array to a managed C++-function by reference,
so that I'm able to change the content of the byteArray and afterwards see
the changes in C#.
(if you wanna know more details: the goal is to write the content of an
existing char-array in c++ precisely into the passed byteArray, so that
after the function has proceded the content of the...
|
by: Kueishiong Tu |
last post by:
How do I convert a Byte array (unsigned char managed) to a
char array(unmanaged) with wide character taken into
account?
|
by: intrepid_dw |
last post by:
Hello, all.
I've created a C# dll that contains, among other things, two functions
dealing with byte arrays. The first is a function that returns a byte
array, and the other is intended to receive a byte array as one of its
parameters. The project is marked for COM interop, and that all
proceeds normally.
When I reference the type library in the VB6 project, and write the
code to call the function that returns the byte array, it works
|
by: frekster |
last post by:
Hi.
I used to be able to do this easily in vb 6 via looping and preserving
the source array data/size etc.
How can I do this in vb.net? I've been trying for a while now and this
should be an easy task but it just isn't clicking.
For some reason, the preserve doesn't seem to be working.
|
by: Robin Tucker |
last post by:
I need to marshal an IntPtr (which I've got from GlobalLock of an HGLOBAL)
into a byte array. I know the size of the array required and I've got a
pointer to the blob, but I can't see how to copy the memory across.
Using Marshal.PtrStructure doesn't work - it says my byte() array is not
blittable! (byte is a blittable type however). Cannot use Marshal.Copy,
because that works the other way around (for mashalling to COM, not from
it).
...
| |
by: Dennis |
last post by:
I was trying to determine the fastest way to build a byte array from
components where the size of the individual components varied depending on
the user's input. I tried three classes I built: (1) using redim arrays to
add to a normal byte array (2) using an ArrayList and finally (3) using a
memorystream. These three classes are listed below the test sub called
"TestBuildByteArray". It was interesting that using the memorystream was...
|
by: =?Utf-8?B?U2hhcm9u?= |
last post by:
Hi Gurus,
I need to transfer a jagged array of byte by reference to unmanaged
function, The unmanaged code should changed the values of the array, and when
the unmanaged function returns I need to show the array data to the end user.
Can I do that?
How?
|
by: ThunderMusic |
last post by:
Hi,
The subject says it all... I want to use a byte and use it as byte* so I
can increment the pointer to iterate through it.
What is the fastest way of doing so in C#?
Thanks
ThunderMusic
|
by: Scott Townsend |
last post by:
So I need to talk to a devices that expects all of the bits and bytes I sent
it to be in specific places (not yet 100% defined).
I wanted to create a structure/class with all of the data in it and then
convert that to a byte array, pass it to the device, then get a reply and
then convert that to a structure.
I'm having issues with making sure what I've coded is correct. Cant figure
out how to define an array in structure that is a...
|
by: O.B. |
last post by:
When using Marshal to copy data from a byte array to the structure
below, only the first byte of the "other" array is getting copied from
the original byte array. What do I need to specify to get
Marshal.PtrToStructure to copy the all the data into the "other"
array?
unsafe public struct DeadReckoning
{
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
| |
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| |
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |