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Anonymous wrote:
Anybody knows how to implement a Generic Hashtable?
Um, not to sound sarcastic, but can you be more specific? .NET's Hashtable implementation seems pretty generic to me--both keys and data are objects.
Marc
MyXaml
Advanced Unit Testing
YAPO
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What I meant is right now Hashtable returns an object which we need to cast to the specific type. This is what I want to eliminate using Generic so I can have a List with Key Value pair but with the specific type value.
Thanks
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public class GrowingHashtable
{
struct bucket
{
internal object key;
internal object val;
}
int size;
bucket[] buckets;
static readonly uint[] primes = { 11,17,23,29,
37,47,59,71,89,107,131,163,197,239,293,353,431,521,631,761,919,
1103,1327,1597,1931,2333,2801,3371,4049,4861,5839,7013,8419,10103,12143,14591,
17519,21023,25229,30293,36353,43627,52361,62851,75431,90523, 108631, 130363,
156437, 187751, 225307, 270371, 324449, 389357, 467237, 560689, 672827, 807403,
968897, 1162687, 1395263, 1674319, 2009191, 2411033, 2893249, 3471899, 4166287,
4999559, 5999471, 7199369 };
public GrowingHashtable()
{
size = 0;
buckets = new bucket[0];
}
static uint Hash(object key)
{
return unchecked( (uint) key.GetHashCode());
}
uint GetCap()
{
uint i = 0, l = 0;
for (;i < size;i++)
{
l += primes[i];
}
return l;
}
int AddBucketSet()
{
bucket[] newbuckets = new bucket[GetCap() + primes[size]];
Array.Copy(buckets, newbuckets, buckets.Length);
buckets = newbuckets;
return ++size;
}
public void Add(object key, object value)
{
for (uint i = 0, pos = 0, hash = Hash(key); i < size; i++)
{
pos += hash % primes[i];
if (buckets[pos].key == null)
{
buckets[pos].key = key;
buckets[pos].val = value;
return;
}
}
AddBucketSet();
Add(key, value);
}
public bool Contains(object key)
{
for (uint i = 0, pos = 0, hash = Hash(key); i < size;i++)
{
pos += hash % primes[i];
if (key.Equals(buckets[pos].key))
{
return true;
}
}
return false;
}
public object this[object key]
{
get
{
for (uint i = 0, pos = 0, hash = Hash(key); i < size; i++)
{
pos += hash % primes[i];
if (key.Equals(buckets[pos].key))
{
return buckets[pos].val;
}
}
return null;
}
set
{
if (!Contains(key))
{
Add(key, value);
}
else
{
for (uint i = 0, pos = 0, hash = Hash(key); i < size; i++)
{
pos += hash % primes[i];
if (key.Equals(buckets[pos].key))
{
buckets[pos].val = value;
}
}
}
}
}
}
xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots
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Does .NET support any way of implementing an OLE server?
I have to write an app that will be contained (displayed
and in-place edited) in AutoCad. I can easily do it in MFC
but would consider using .NET if it supported.
Thanks
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Hi there, I'm developing graphic IDE and I would like to use some of the Visual .NET 2003 icons - for exmple I have a property pgrid and would like to have the same icon as in Visual (the hand), or toolbox (wrench and hammer). Do you know where I can find those?
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They're probably available in some dll in Visual Studio. If you download beta 2 of VS 2005, you'll notice there's an icon library provided at the request of developers under the Visual Studio 8\Common 7\ directory, called VS2005ImageLibrary.zip, which contains all the icons used in VS.
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Horrific Minnesota Radio
Judah Himango
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If you are using the .Net 2003 you will find it in the :
Common7\graphics . all are there.
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In C++, I could read/write an object thus:
read ((void*) &myObject, 0, sizeof (Object)); //same for write
...rather than having to write a function that read/writes each individual field in the object. Can this be done in C#? My attempt gives me a problem with the &myObject: "can't take the address of a managed class."
If not, can this be done some other way?
If not . . . my alternate in C++ would be
istream& operator>> (istream& in, myClass& myObject)
{
return in >> field1 >> field2 >> ...;
}
The closest I can come in C# is
public void Read (Stream s)
{
s.ReadBool (field1);
field2.Read (s); //if field2 is of a class that I wrote
for (int i = 0; i < DimensionIHaveToRemember1; ++i)
for (int j = 0; j < DimensionIHaveToRemember2; ++j)
s.ReadInt (field3[i,j]);
...
}
(assuming
bool field1;
someClass field2;
int [,] field3; //OK, I'd have to do something special
//to make C++ do this easily, too...
...)
...and this seems needlessly messy. Is there a better way?
Thanks -- and if you want to refer me to a book, fine: C# and the .NET platform by Troelson is what I'm using, and it doesn't answer these questions, but maybe another does.
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This is called serialization, and you can use a BinaryFormatter to serialize. Read Binary Serialization[^] in the .NET Framework SDK for more information and samples.
In C/C++ this works because of how memory is laid out, but in the managed world things are different. Reading data into a struct in native code can also be secure, while the Framework allows you to place constraints on your fields and properties (depending on what you serialize).
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft
[My Articles] [My Blog]
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Take a look at classes like MemoryStream and BinaryFormatter. The drawback to this is that you have to write out the class/fields with BinaryFormatter as well. If you need to put bytes directly into a field, you can use unsafe (you also have to set a compiler switch on the project to enable unsafe). Unsafe will allow you to get a pointer to the field.
Marc
MyXaml
Advanced Unit Testing
YAPO
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Also, if you have to deal with binary formats coming from hardware and you want to put the data into a structure, look at StructLayout and the FieldOffset attribute.
Lastly, consider writing a C++ dll to handle that nastiness that returns happy managed data to the managed code.
Marc
MyXaml
Advanced Unit Testing
YAPO
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Thanks, Heath, Marc! Serialization is exactly what I wanted.
I'm having this problem using it:
[Serializable]
public class Superclass ...
[Serializable]
public class Subclass: Superclass ...
{
[Nonserializable]
private Bitmap bigThing = bitmap ("bigfile.bmp");
}
...
//mySubclassObject already exists
IFormatter formatter = new BinaryFormatter();
mySubclassObject = (visualBoard) formatter.Deserialize(s);
So when I do this, I successfully load the parts I want . . . but the bitmap is of course not loaded, and mySubclassObject is not displayable. Before I start this chunk of code, it knows where the bitmap is.
I also tried moving this deserialization code into a method of Subclass, so I could then remind it where the bitmap is, but then I can't deserialize into "this" because "this" is read-only.
Thanks for all--
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Hi,
I have a flat file at an http intranet server location. I need to access it and download it using a console application. Any ideas? Please email me at mrinmayee.k@gmail.com
Thanks
Minu
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You can either use the WebClient.DownloadFile method, or - for more control - a pair of HttpWebRequest and HttpWebResponse classes. The likely namespace to search for these types of classes is System.Net, and I suggest you explore[^] the namespace. The method and classes I mention above also have samples you can read.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft
[My Articles] [My Blog]
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Lets say I have a visual control with several properties set during design that will affect the display of the control. How do I ensure that the control is repainted after the properties are set in InitializeComponent? Is there a way to determine the order that the control's properties are initialized in InitializeComponent so that I can ensure that the last initialization causes a repaint? Or is there an event that I can overrride that fires when the initialization is complete?
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terrier_jack wrote:
How do I ensure that the control is repainted after the properties are set in InitializeComponent?
I believe that is the purpose of the ISupportInitialize interface--it lets other things do all the property setup, then when the EndInit() method is called, your class can do whatever it needs to configure itself based on those property values.
Marc
MyXaml
Advanced Unit Testing
YAPO
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Why can't you do as this:
Public MyControl()<br />
{<br />
InitializeComponents();<br />
this.refresh();<br />
}
As it will be refreshed after the call of the init() is returned and all the initialization is complete.
Assuming that your visual properties will be user in the Overrode OnPaint Method .
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Hi every body!
Do you know any control (.net) help designing HTML on desktop application?
It is like WYGIWYS, but use for desktop app!
THanks!
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You can use the WebBrowser control just as you would for browsing in a Windows Forms application, but for a WYSIWIG (the more common acronym, BTW) editor you set WebBrowser.Document.designMode to "On" (upper-case "O" is important).
There are lots of articles here on Code Project about how to make this work, since there are plenty of issues you have to address (like only setting this when the document is finished loading). I recommend you search this site (using the text box below the logo on every page) for "WebBrowser designMode" for a list of articles.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft
[My Articles] [My Blog]
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I am unable to connect the client which is written in Managed code (C# .Net) with server UnManaged code(VC++ 6.0). Can any of u plz help me in this regard.
Shashidhar
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I depends entirely on what the server application is expecting. What kind of connection is the server expecting? RPC? Socket? What port number? Without knowing the details of the server, it's impossible to tell you what to do...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
I've a client-server application where clients ans servers connect with config file.
<br />
RemotingConfiguration.Configure("file.xml");<br />
m_DataMgrConnexion = (IDataManager) RemotingHelper.GetObj(typeof(IDataManager));<br />
RemotingHelper is a class written by Ingo Rammer (see : http://www.thinktecture.com/Resources/RemotingFAQ/USEINTERFACESWITHCONFIGFILES.html [^]
The problem is that I can't disconnect client using config file (in fact, I would like to unregister the channel because I need to disconnect and reconnect with an other config file)
Is there a way to unregister the channel using this type of connection ?
I can't register by another way because i'm using events and config file connection is the best way to go
thks,
sokette
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First of all, if you have questions about RemotingHelper you should contact Ingo Rammer. This forum is for general questions, and specific questions about articles on this site need to go at the bottom of the article pages.
Second, all his RemotingHelper does is encapsulate functionality that already exists. I would recommend using either ildasm.exe from the .NET Framework SDK or .NET Reflector[^] to view how his implementation works.
When you use RemotingConfiguration.Configure, you need to get references where you can. To unregister a channel, you should try using ChannelServices.GetChannel and pass that returned reference to ChannelServices.UnregisterChannel. You should be able to pass the MarshalByRefObject-derived remoting object to RemotingServices.Disconnect depending on its construction.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft
[My Articles] [My Blog]
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Thks a lot for your answer;
I've try your solution. I still have a problem ...
connect :
<br />
RemotingConfiguration.Configure("file.config");<br />
m_DataMgrConnexion = (IDataManager) RemotingHelper.GetObj(typeof(IDataManager));<br />
disconnect :
<br />
ChannelServices.UnregisterChannel(ChannelServices.GetChannel("ClientChannel"));<br />
==> If I connect and disonnect Ok, but if I try to reconnect after connecting and disconnecting, I have the following error :
RemotingException : Remoting configuration failed with the exception System.Runtime.Remoting.RemotingException: Attempt to redirect activation of type 'IDataMgrRemote.IDataManager, IDataMgrRemote' which is already redirected.
at System.Runtime.Remoting.RemotingConfigInfo.AddWellKnownClientType(WellKnownClientTypeEntry entry)....
Then, I changed my disconnect method
<br />
ChannelServices.UnregisterChannel(ChannelServices.GetChannel("ClientChannel"));<br />
RemotingServices.Disconnect((IDataManager)m_DataMgrConnexion);<br />
but I've another error when I try to disconnect : Cannot call disconnect on a proxy.
Thks for u help
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