|
 I have to write a program in c#,recently. However I don't know what to write about.I think it may be about socket programing. But in fact, there are still too much we can write using sockets. Still, I want to write something new. Can you all help me, and give me some sugguestion? Think you all.
|
|
|
|
|
Anything on Remoting or using Managed DirectX  A C# CodeDom codeparser will be nice while you are at it
Who is this miscrosoft, and what devilish plans have they for us?
|
|
|
|
|
I vote for Yacc and Lex.
Вагиф Абилов
MCP (Visual C++)
Oslo, Norway
Hex is for sissies. Real men use binary. And the most hardcore types use only zeros - uppercase zeros and lowercase zeros.
Tomasz Sowinski
|
|
|
|
|
Hi all,
How do I convert the current value of a DateTimePicker control to a DataTime object?
Thanks
Donal
|
|
|
|
|
From MSDN:
DateTimePicker.Value Property
See Also
DateTimePicker Class | DateTimePicker Members | System.Windows.Forms Namespace | DateTime
public DateTime Value {get; set;}
Property Value
The DateTime value assign to the control.
Remarks
If the Value property has not been changed in code or by the user, it is set to the current date and time (DateTime.Now).
Example
The following example demonstrates how use the Value property to retrieve the current date value. First, the example displays the Value property. The example then increments the Value property by one day and displays the property value again.
public MyClass()
{
DateTimePicker dateTimePicker1 = new DateTimePicker();
Controls.AddRange(new Control[] {dateTimePicker1});
MessageBox.Show(dateTimePicker1.Value.ToString());
dateTimePicker1.Value = DateTime.Now.AddDays(1);
MessageBox.Show(dateTimePicker1.Value.ToString());
}
Who is this miscrosoft, and what devilish plans have they for us?
|
|
|
|
|
|
Hi:
I’m an intermediate level C#.net programmer and I found your email address at www.dotnet247.com … My difficulty is parsing a Log File into a SQL database. The RegEx looks very interesting; however I would like a sample code to learn with. Help….
This is a sample from a typical Log File. The “Headings” (Date & Time, etc) above the Log File entries are NOT in the actual file. I placed them there to represent my SQL database table columns I would like to “Break” the information into...
| Date & Time | Activity | Source IP | Dest IP | Reason |
Wed, 01/15/2003 10:29:03 - TCP connection dropped - Source:211.218.37.114, 3017, WAN - Destination:206.104.18.112, 1433, LAN - 'Suspicious TCP Data'
Wed, 01/15/2003 11:01:25 - UDP packet dropped - Source:200.11.88.226, 64546, WAN - Destination:206.104.18.112, 137, LAN - 'Suspicious UDP Data'
Wed, 01/15/2003 11:08:05 - TCP connection dropped - Source:198.87.196.145, 53, WAN - Destination:206.104.18.112, 1177, LAN - 'Suspicious TCP Data'
Wed, 01/15/2003 11:38:08 - UDP packet dropped - Source:65.167.107.117, 1027, WAN - Destination:206.104.18.112, 137, LAN - 'Suspicious UDP Data'
Wed, 01/15/2003 14:26:02 - TCP connection dropped - Source:208.186.78.104, 80, WAN - Destination:206.104.18.112, 2563, LAN - 'Suspicious TCP Data'
Kevin@upgrade1.com (Please reply to email address)
|
|
|
|
|
The BeginListener function will not receive any information from the socket
past a certain amount (apparently 4096 bytes). Information sent that is
smaller than that is received properly. If data is sent that is larger than
that, it's truncated to 4096 bytes, and then the while loop exits (which it
should never do).
<br />
private void BeginListener()<br />
{<br />
byte[] b = new byte[10000000];<br />
int k;<br />
Socket s;<br />
String strMessage = "";<br />
<br />
TcpListener newList = new TcpListener(10000);<br />
newList.Start();<br />
while (true)<br />
{<br />
strMessage = "";<br />
<br />
s = newList.AcceptSocket();<br />
k = s.Receive(b);<br />
<br />
for (int nCounter = 0; nCounter < k; nCounter++)<br />
{<br />
strMessage += (char)b[nCounter];<br />
}<br />
}<br />
newList.Stop();<br />
}<br />
<br />
<br />
private void SendCommand(String Address,String strTempFile)<br />
{<br />
StreamReader newReader = new StreamReader(strTempFile);<br />
String strSendString = newReader.ReadToEnd();<br />
newReader.Close();<br />
<br />
newClient = new TcpClient();<br />
NetworkStream tcpStream = null;<br />
byte[] ba;<br />
<br />
try<br />
{<br />
newClient.Connect(Address,10000);<br />
tcpStream = newClient.GetStream();<br />
ASCIIEncoding asem = new ASCIIEncoding();<br />
ba = asem.GetBytes(strSendString);<br />
tcpStream.Write(ba,0,ba.Length);<br />
}<br />
catch (System.Net.Sockets.SocketException)<br />
{<br />
}<br />
finally<br />
{<br />
if (tcpStream != null) {tcpStream.Close();}<br />
if (newClient != null) {newClient.Close();}<br />
}<br />
}<br />
Any help would be greatly appreciated.
|
|
|
|
|
You should never read this much information in one read. Many servers don't even send information that fast and your socket times-out while waiting. Buffer your respones into byte[4096] (a good recommended size) and write them out to a stream (using the read byte count) as they're read-in. This is how practically every transport mechanism works.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
|
|
|
|
|
First of all, there no such limitation in the .NET Socket implementation : the actual code beinh Receive() is in fact a direct Winsock2 recv() function call, and it passes your buffer directly, not an intermediate buffer.
I can see an error in your code : in your loop, you are Accepting a new socket instance at each iteration.  Usually, you accept a socket once, and then loop with Receive.
|
|
|
|
|
I have a Bitmap that has loaded in a map. When I click on the map (bitmap), I want to draw a filled circle at that point. I understand how to do it with a PictureBox or something that I can get a Graphics object for/from it, but I can't for the life of me figure out how to do the same with a bitmap.
Is there a way to do this? I'm sure there is, I just haven't figured it out yet. So, if any of you could help me out by pointing me in the correct direction, code fragments, or whatever, I'd really appreciate it.
Thanks a bunch!
Mike
|
|
|
|
|
Graphics g = Graphics.FromImage(bmp);
g.DrawLine(...);
g.Dispose();
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
|
|
|
|
|
Heath,
Thanks for responding.
I tried that and got the following error:
An unhandled exception of type 'System.Exception' occurred in system.drawing.dll
Additional information: A Graphics object cannot be created from an image that has an indexed pixel format.
Any ideas?
Thanks again,
Mike
|
|
|
|
|
Well, my first suggestion would be to read the docs (especially about Image and Bitmap). My second suggestion, having said that, it to save the indexed image to a MemoryStream using a different <codepixelformat< code=""> then read it back in and get the <code>Graphics object from that. There are many other ways you can do this, too.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
|
|
|
|
|
Hi Heath!
Thanks again for replying. To start off, as if you probably couldn't tell, this is my first foray into doing much of anything with graphics. Lots of middle/backend programming with next to nothing in the UI department for the last 8 years.
That being said, what docs are you talking about? I've read the documentation that Microsoft has written on the Image and Bitmap classes but they're rather thin when you don't know much about using graphics in general. Are there other places that have better documentation? If so, please point me to them!
Also, I will look into the MemoryStream option, but I have one question: you say to save the indexed image (BTW what is that? I just thought I was loading a BMP file! There's different types of BMPs?) using a different ...?? I get the last part (at least in theory) but what different thing am I to use?
Thanks again for the advice. It really does help.
|
|
|
|
|
Yeah, the Microsoft .NET documentation. This documentation is what I've used and don't know much about graphics either, but these is *very* basic drawing routines - not much documentation is needed.
The Bitmap</code class does not equate to a .bmp file. It adds a few methods and properties to the <code>Image class for bitmap images. All image formats (i.e., JPEG, GID, PNG, BMP, RGB, etc.) that I'm aware of are technically bitmaps - a map of bits essentially. Most formats basically have an (A)RGB value for each bit (the whole of which makes up the bitmap). Index images basically have a palette of colors that are indexed and the image contains a mapping of pixels <-> palette index. That's a very basic description of both of those things, but that covers the gist of it.
BTW, there are different kinds of .bmp files (remember, this is not exclusive to the Bitmap class). The difference is the way the bitmaps are encoded in the file. There's Windows and OS/2 encodings that I know of. This is a similar concept to video files, just like an AVI can have different encodings (MPEG4, DivX, etc.).
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
|
|
|
|
|
Thanks Heath. You've added to my knowledge base and that's great.
I did get things to work, but not in the place that I want it. Now that I know it works like you said, it's just a matter of figuring out how to do it in the OnMouseXxx functions.
Thanks for you help and input!
Mike
|
|
|
|
|
If a method doesn't give you a Graphics object, you can always get one for a particular control by using Control.CreateGraphics(). In this case, though, you must call Graphics.Dispose() when you're done with it. In event handlers like OnPaint() that give you one, it will clean it up for you so *never* call Graphics.Dipose() at that time.
"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons
|
|
|
|
|
Thanks Heath!!
I hadn't gotten far enough in the documentation to figure this out. One of those cases where you have to get something done and reading documentation (or anything else other than getting the thing done) is frowned upon.
I tried it and this works beautifully! Thanks again.
|
|
|
|
|
Okay. Here's what I've tried. I was successful on doing the simple and easy way that Heath suggested in just having a Graphics g = Graphics.FromImage(bmp) and drawing on the bitmap when in the On_Paint() method of the class I'm working on.
To simplify things for myself, I've changed the Bitmap to an Image and loaded it in from the BMP file and had everything work correctly.
Now for the thing I'm not sure how to do: When I'm in the OnMouseDown() (which is where I would like to call a function to draw a node on the map since I have a Point to do it at), I can't seem to get a Graphics object from my Image object to do the drawing with. What should I do? It obviously can be done since I do it in the On_Paint() function.
Any pointers would be appreciated.
Thanks a bunch,
Mike
|
|
|
|
|
How to add code to the verb action in the file type actions after setting them in installer
Also how to get the file info , with which the application is invoked
I found that it only launches the application but doesnt call the function i specified its name in the verb property in the installer
thanks,
Wella
|
|
|
|
|
Greetings,
I'm new to the C# experience as such and on top of that I use rather a poorman's development tool, without many of VS.NETs nice drag-and-drop features where it comes to layouts etc.
I'm in need of a bar containing a button with a dropdown, a textfield and another button with a dropdown, in that order. Because of the textfield I suppose I'd better not try solving this using a toolbar and its menus. However, being a n00b, that's the only way I'm able to do above from the top of my head (ie without drag-and-dropping most of it).
So my rather embarrassing question is wether someone could spent a sec and hand me a snipplet of above. Yes.. I know  Thanks a bunch!
|
|
|
|
|
What happens with events if computer is slow.
Lets say a timer ticks with 50Hz and the event handler does heavy computations that on P4 2GHz are done perfectly but if the program is run on a Celeron 266 and the computations are done slowlier that the timer ticks. What is going to happen to the timer event? Will it wait for the calculation to stop or it will be ignored and what is worse the program is going to crash.
Well if we don't need 100% reliable data a calculation or two may be omitted but it is better that the programs works on the slower computer that not to work at all.
|
|
|
|
|
Zinj wrote:
Lets say a timer ticks with 50Hz and the event handler does heavy computations that on P4 2GHz are done perfectly but if the program is run on a Celeron 266 and the computations are done slowlier that the timer ticks.
Timer runs in its own thread. Thus the timer will fire its event at the same interval whether on a P4 or a P1.
Zinj wrote:
Will it wait for the calculation to stop or it will be ignored and what is worse the program is going to crash.
Why not test it yourself....? I unfortunately dont have 2 PC's to try it on. Perhaps place a lock on some objects, and maybe do each calculation in it own thread, so it can finish on its own time.
One question: why are doing the calculations from a timer event?
Who is this miscrosoft, and what devilish plans have they for us?
|
|
|
|
|
so I think to calculate some equations 30 times a second (motion, physical simulation, etc)
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
