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I've created a class that needs to have a subclass array of the same class, so basically my class contains an array of itself. Does this make sense? What is the best way to go about doing this? Basically I need to make a heirarchy of these classes that can never end
Class
Class1
ClassA
ClassB
Class2
All these classes have the same properties.
Thanks,
JGA
-- modified at 20:49 Monday 24th October, 2005
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You mean an array of class types ? You can't do this, because Class1 cannot derive from ClassA and ClassB, and if it did, this couldn't work when both classA and classB expose the same methods. The obvious thing would be to create an interface, and impliment it in all of these classes, but your class heirarchy would be flat, you could have one base class at most on each level, and they would all impliment the interface in the same way
What are you trying to do ?
Christian Graus - Microsoft MVP - C++
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I have a todo list heirarchy and each element can have it's own properties (due date, title, priority). so I can have:
Class=
Title:Version 1
DueDate: 12/01/05
Priority: High
SubClass:
Title:Create blah
DueDate: 10/26/05
Priority: High
I'm reading from an XML File to get all of the data, the XML format is something like:
<TODOLIST>
<TASK DUEDATE=10/24/05 TITLE=ASDF PRIORITY=HIGH>
<TASK TITLE=sdfa></TASK>
</TASK>
Does that make sense at all?
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OK - so there's no reason in the world to create a class heirarchy. All you need to do is create a class ( or a struct, more like it ), that contains a reference to itself as a parent and a collection of items that represents it's children ( so you can iterate in either direction ).
So you need one class, like this
class myClass
{
private string title;
private DateTime dueDate;
private PrioryEnum priority; // Create an enum for this
private myClass parent;
private ArrayList children;
}
Then add properties for access as needed.
Christian Graus - Microsoft MVP - C++
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do you'd just create an arraylist of class myclass right?
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jgallen23 wrote: do you'd just create an arraylist of class myclass right?
If you're using VS2005, then yes, you can create an array of a specific type. Otherwise, the arraylist will contain only objects, but yes, it would be an array of the class instances that are the children of the current object.
Christian Graus - Microsoft MVP - C++
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Hi All
I must ask 2 question that i cant find the answer for them
1. When i use c++ [MFC] i add the function GetDlgCtrlID to get Ctrl Id of the CButotn os CList when i set some event of the Button or list.
Does in C# there is some parallel method that return the ID of the control ?
2. I need to load some WAV file and play it in Real Time.
How can i do it in C# ?
Thanks for the help.
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yanshof wrote: Does in C# there is some parallel method that return the ID of the control ?
The base control class has an ID property. The ID is a string, not a number, as it was in C++.
yanshof wrote: 2. I need to load some WAV file and play it in Real Time.
How can i do it in C# ?
Import the PlaySound API using pinvoke, or use Managed DirectSound.
[DllImport("coredll.dll")]
public static extern int PlaySound(
string szSound,
IntPtr hModule,
int flags);
public enum PlaySoundFlags : int {
SND_SYNC = 0x0, // play synchronously (default)
SND_ASYNC = 0x1, // play asynchronously
SND_NODEFAULT = 0x2, // silence (!default) if sound not found
SND_MEMORY = 0x4, // pszSound points to a memory file
SND_LOOP = 0x8, // loop the sound until next sndPlaySound
SND_NOSTOP = 0x10, // don't stop any currently playing sound
SND_NOWAIT = 0x2000, // don't wait if the driver is busy
SND_ALIAS = 0x10000, // name is a registry alias
SND_ALIAS_ID = 0x110000,// alias is a predefined ID
SND_FILENAME = 0x20000, // name is file name
SND_RESOURCE = 0x40004, // name is resource name or atom
};
Christian Graus - Microsoft MVP - C++
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Can you guys tell me if these are correct? I'm parsing a file, word by word, and I'm trying to see if they fit into the correct format.
The first format is if the token is a double. Meaning we have 1234 or 1234.0123
What I have is if( (Regex.IsMatch( token, @"\d*")) || (Regex.IsMatch( token, @"\d*[.]\d*")) )
The second is if it is a letter followed by any other alphanumeric up to 10 characters total in length:
if( Regex.IsMatch( token, @"\b[a-zA-z]\w{2,3,4,5,6,7,8,9}\b") )
Do those look right?
Thanks in advance!
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jeweladdict wrote: What I have is if( (Regex.IsMatch( token, @"\d*")) || (Regex.IsMatch( token, @"\d*[.]\d*")) )
You can do this with one regex
@"\d*([.]\d*)?"
jeweladdict wrote: if( Regex.IsMatch( token, @"\b[a-zA-z]\w{2,3,4,5,6,7,8,9}\b") )
YOu can shorten {2,3,4,5,6,7,8,9} to {2, 9}.
Expresso is the program you need to test your regex, just google it, I think it's on CP tho.
Christian Graus - Microsoft MVP - C++
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@"\d*([.]\d*)?" seems to work for IP addresses as well. I tried using the @"\b\d*([.]\d*)?\b" but that didn't seem to help. I'm only looking for numbers that are possible doubles. Any ideas?
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I have a problem when I try to copy the richtextbox text to the items in a listbox. Is there a way to stop it from placing the entire richtextbox text as 1 item. below is an example of what I mean.
http://img456.imageshack.us/img456/1223/listbox8al.png
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Split the string on \r or \n, whichever is the delimiter that's causing the boxes you see. You need to split the string, then insert it one line at a time.
Christian Graus - Microsoft MVP - C++
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I did this and it seems to not be working, im stuck.
myRTF = richTextBox1.Rtf;
while (myRTF.Length > 0)
{
//Find the index of the RTF Return Character
int index = myRTF.IndexOf("\r\n");
//Extract the RTF to that point
string temp = myRTF.Substring(0, index);
//Trim the extracted part of the RTF
myRTF = myRTF.Substring(index, myRTF.Length - index);
//Add the item to your list box
listBox1.Items.Add(temp);
}
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This is C#, your string class has a split method. Try splitting on just \r, or just \n. The boxes you get in your list box make me think the rich text control is returning one of those two, and not both. So, call the split method and get a string array, use for each to pass them into the list box.
Christian Graus - Microsoft MVP - C++
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I did try to do the split on just /n or /r but no luck?
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Just a sec, I'll whip up a project for you
Christian Graus - Microsoft MVP - C++
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Your slash is the wrong way around. This works:
string text = richTextBox1.Text;
string [] strings = text.Split('\n');
foreach (string s in strings)
{
if (s.Length > 0)
listBox1.Items.Add(s);
}
Christian Graus - Microsoft MVP - C++
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You own man, thanks a bunch!!
Ron
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If i open aFile in FileStream with FileAccess.Write, it is locked so i can't rightclick on it and copy or delete or move...
Is it possible in any way?
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just simply close FileStream or ur application, then delete the file
<< >>
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I have a C# application that acts as a socket listener.
I have another class that is built as a managed C++ dll that processes my data and sends the data back out to the connected client.
My question is, im having problems passing my active connection to the managed dll.
I did something like this:
C# side:
Socket socks;
//lets pretend its already connected, and accepted, huh
int success = ManagedMethod(ref socks);
C++ Side:
SOCKET *socks;
int ManagedMethod(Socket& act_sock)
{
socks = act_sock
}
cant remember what error it gives me, but I know its not right.
On the parameters of this method, I also tried 'Socket *act_sock' and still couldnt pass it.
My goal is to have my Managed C++ dll use this active connection after processing my data and send it to the connected client.
Thanks.
Steve Welborn
"Science can purify religion from error and superstition.
Religion can purify science from idolatry and false absolutes"
- 1987 John Paul the Great
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Do you need to pass it as ref from C#? Remember, socks itself is a reference, so passing it by ref would require a pointer to a pointer on the MC++ side.
Assuming you don't need ref, this code compiles fine.
public __gc class Class1
{
Socket __gc * socket;
public:
void ManagedMethod(Socket __gc * s)
{
socket = s;
}
};
From C#, you can pass it as ManagedMethod(socks);
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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Thanks Senthil for the reply.
I guess I dont need it by ref, the only thing I needed was to be able to use the same instance of that Socket, with it staying connected and usable while being passed to my C++ dll.
So would the C# part be a regular passing of the connected Socket?
for instance:
Socket socks;
ManagedMethod(socks);
and does passing it like this allow the C++ portion to use it without reconnecting and accepting of client?
Steve Welborn
"Science can purify religion from error and superstition.
Religion can purify science from idolatry and false absolutes"
- 1987 John Paul the Great
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