This code compiles (this is how it should work):
Socket sock = new Socket(AddressF amily.InterNetw ork, SocketType.Stre am,
ProtocolType.Tc p);
This code does not compile (passing an int instead of an AddressFamily is
bad):
Socket sock = new Socket(1, SocketType.Stre am, ProtocolType.Tc p);
But why on earth does not compile:
Socket sock = new Socket(0, SocketType.Stre am, ProtocolType.Tc p);
Is the number zero some kind of special case here? Why is zero accepted when
the parameter type clearly says that an AddressFamily enum value is expected?!
regards,
martin 1 1788
martin wrote: This code compiles (this is how it should work): Socket sock = new Socket(AddressF amily.InterNetw ork, SocketType.Stre am, ProtocolType.Tc p);
This code does not compile (passing an int instead of an AddressFamily is bad): Socket sock = new Socket(1, SocketType.Stre am, ProtocolType.Tc p);
But why on earth does not compile:
Typo, I assume.
Socket sock = new Socket(0, SocketType.Stre am, ProtocolType.Tc p);
Is the number zero some kind of special case here? Why is zero accepted when the parameter type clearly says that an AddressFamily enum value is expected?!
Yes, zero is a special case. Here is a shorter example:
System.Net.Sock ets.AddressFami ly af1 = 1; // no compile
System.Net.Sock ets.AddressFami ly af1 = 0; // compile
The reason can be found in section 6.1.3 of the C# spec:
<http://msdn.microsoft. com/library/default.asp?url =/library/en-us/csspec/html/vclrfcsharpspec _6_1_2.asp>
(sic, the url says 6.1.2 but the page is 6.1.3 :))
C# Language Specification
6.1.3 Implicit enumeration conversions
An implicit enumeration conversion permits the decimal-integer-literal
0 to be converted to any enum-type.
Elsewhere in the docs, we are also told "The default value of an enum E
is the value produced by the expression (E)0."
--
Larry Lard
Replies to group please This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Clive |
last post by:
Hello everyone,
This is my first time posting, up until now i've only used google to seach
:)
I'm creating a multiplayer minesweeper game in Windows, so I have been
reading up on CSockets. I am begining to have a grasp on them, but I have
this one query.
If a socket some data comes along that isnt part of my protocol, I want to
|
by: Glenn Venzke |
last post by:
I'm writing a class with a method that will accept 1 of 3 items listed in an
enum. Is it possible to pass the item name without the enum name in your
calling statement?
EXAMPLE:
public enum EnumName
FirstValue = 1
SecondValue = 2
ThirdValue = 3
|
by: Schorschi |
last post by:
Can someone please point out why I am getting an 87 error? I am sure
it is obvious, but I am new to C# and seem to be having a lot of
stress understanding managed versus unmanaged code when API calls are
needed!
//
using System;
using System.Runtime.InteropServices;
|
by: Jeffrey B. Holtz |
last post by:
Has anyone used the multimedia timere timeSetEvent in C#? I'm trying
to use it to get a 1ms accurate timer. All the other implementations
are far to inaccurate in their resolution. 1ms Timer = 0ms.....60ms.
I'm already timing the callbacks using the Win32API
QueryPerformanceCounter/Frequency. The code I have is actually
performing the callback and it looks like it is close to 1ms but I now
need to get my object passed to this static...
|
by: Johnny |
last post by:
I'm a rookie at C# and OO so please don't laugh! I have a form
(fclsTaxCalculator) that contains a text box (tboxZipCode) containing a zip
code. The user can enter a zip code in the text box and click a button to
determine whether the zip code is unique. If the zip code is not unique,
another form/dialog is displayed (fclsLookup) - lookup form/dialog. The zip
code is passed to the lookup form/dialog by reference. I then load a...
| |
by: semedao |
last post by:
Hi , I am using asyc sockets p2p connection between 2 clients.
when I debug step by step the both sides , i'ts work ok.
when I run it , in somepoint (same location in the code)
when I want to receive 5 bytes buffer , I call the BeginReceive and then
wait on AsyncWaitHandle.WaitOne()
but it is signald imidiatly , and the next call to EndReceive return zero
bytes length , also the buffer is empty.
here is the code:
public static byte...
|
by: Steve Richter |
last post by:
when I call a win32 api like CreateFile, I would like to be able to
pass an enumerated value as the parameter value:
hFile = CreateFile(
InPath, GENERIC_READ,
ShareMode.Read, // this is an enum
IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
I know I can cast the enum:
(uint) ShareMode.Read
|
by: darthghandi |
last post by:
I am trying to pass a socket object when an event is signaled. I have
successfully bound to a network interface and listened on a port for
incoming connection. I have also been able to accept that connection
and get the socket. I try to signal an event when this happens and
pass that new socket object when the event happens, but when I try to
pass the socket with this statement:
ConnectionReceived(this, work);
I get this exception in...
|
by: arnuld |
last post by:
I am passing an array of struct to a function to print its value. First
I am getting Segfaults and weired values. 2nd, is there any elegant way to
do this ?
/* Learning how to use an array of struct */
#include <stdio.h>
|
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: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
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: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
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: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |