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Re: listbox sangramkp7-Jul-07 1:41 sangramkp 7-Jul-07 1:41  Thanks for the reply.. I am using SqlServer. I am having a listbox with items in format: 1,1 1,2 .. 2,1 2,2 .. Now I want to store them in a database table say testtable. I am a little confused and need a little help. will u focus a ray of light to show me the path? Regards Sangram Re: listbox Paul Conrad7-Jul-07 5:42 Paul Conrad 7-Jul-07 5:42  sangramkp wrote: I am a little confused and need a little help. You are not clear on what you need help with...Please give a bit more detail... "Any sort of work in VB6 is bound to provide several WTF moments." - Christian Graus Re: listbox sangramkp8-Jul-07 18:53 sangramkp 8-Jul-07 18:53  I need help on the context: How to store the items og a listBox into a table in SqlServer Database. Binary data ornelaso6-Jul-07 13:22 ornelaso 6-Jul-07 13:22  I have a file(s) that contains text and binary data, the data in the file looks as follows (this is partial data): LO50,207,692,8 A195,344,0,1,4,4,N,"{SZ}" A400,221,0,4,3,3,N,"{LOT}"GW388,450,48,160,ÿ<ð<0ð<ÃÌ<0<ðð3ÀÃ<<0óÀÃÏÃÌ<ÀóÀðÌóÀÌ?ÿ<ð<0ð<ÃÌ< A463,349,0,1,3,3,N,"{UOM}" A616,358,0,1,3,3,N,"/59 ML" A369,345,0,3,2,2,N,"FL." Here is the problem, I need to have my program replace the tags (data enclosed in parenthesis) with some other information, then stored the new data in a second file. However, this must be done w/out affecting the binary data within the file, which does not need to be modified. I do not know what encoding type is used for the binary part of the data, hence when writing to the destination file, the binary data is in the incorrect encoding type. I know that I should probably be using "unicode" as opposed to "UTF" when reading/writing from/to the files, however, if I use "Unicode" how do I replace the tags by their value? Thanks for any help on this, Peter The code that I'm using is something as the following: //Read data from Source FileStream fs = new FileStream(strSource, FileMode.OpenOrCreate,FileAccess.Read); byte[] MyData= new byte[fs.Length]; fs.Read(MyData, 0, System.Convert.ToInt32(fs.Length)); fs.Close(); string sData = Encoding.UTF8.GetString(MyData); //Replace tag with correct value sData = System.Text.RegularExpressions.Regex.Replace(sData,"{SZ}","21231"); //Write to Destination File byte[] bData = Encoding.UTF8.GetBytes(sData); FileStream fs1 = new FileStream(strDestination, FileMode.OpenOrCreate,FileAccess.Write); BinaryWriter bw = new BinaryWriter(fs1); bw.Write(bData); bw.Close(); fs1.Close(); Re: Binary data Luc Pattyn6-Jul-07 16:08 Luc Pattyn 6-Jul-07 16:08  Hi, some information is missing: in the parts that are non-binary it is easy enough to find parentheses and do whatever is required; but in the binary parts there might be bytes that have the exact same value as a regular parenthesis has. So you must know when to switch from non-binary (interpreting) to binary (dont touch me) mode, and back. As long as this is undefined, no one can come up with an approach that works. You showing the file as if it is line oriented does not help either, since the carriage return, line feed, new line, or whatever control character you consider could also occur in the binary data and make you switch incorrectly from binary to non-binary mode. So you need extra knowledge; could be things such as: - in binary mode some byte values will never occur; when they do, they exit binary mode and are considered a non-binary symbol. - optionally: and when they are needed as a binary value, they will be escaped (i.e. prefix an additional special byte value), or produced twice. - in non-binary mode only a selected list of commands will switch to binary mode etc. Luc Pattyn [My Articles] [Forum Guidelines] getting a value from an event arg. Glen Harvy6-Jul-07 12:58 Glen Harvy 6-Jul-07 12:58  Hi, I have a button with an event attached (This made me smile because there's not much point with a buttin that hasn't ) Anyhow - how can I get the value of the button.Tag to use within the code that is fired? It seems to be passed to the method but I can't see how to retrieve it? TIA. Glen Harvy Re: getting a value from an event arg. PIEBALDconsult6-Jul-07 13:05 PIEBALDconsult 6-Jul-07 13:05  ((System.Windows.Forms.Button) sender).Tag ? Re: getting a value from an event arg. Glen Harvy6-Jul-07 13:28 Glen Harvy 6-Jul-07 13:28  That's it I was very close to working it out and was on the right track - it was changing the object sender to a button object that actually had me stumped. Thanks heaps. Glen Harvy Re: getting a value from an event arg. PIEBALDconsult6-Jul-07 16:47 PIEBALDconsult 6-Jul-07 16:47  Glen Harvy wrote: changing the object sender The thing to remember is that you're not changing it; it is a Button, but you need to tell the compiler that it is. In some cases you may also need to test what type the sender is if ( sender is System.Windows.Forms.Button ) { ... } Re: getting a value from an event arg. Christian Graus7-Jul-07 1:02 Christian Graus 7-Jul-07 1:02  I would always use the 'as' keyword. Button btn = sender as Button; if (btn != null) { // process here } The other answer you got is correct, it *will* always be a button, and he mentioned 'as', which is also correct. But, for me, casting is a bad habit best avoided, even when I know I can get away with it. Christian Graus - Microsoft MVP - C++ "I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum ) Private UDDI mughaldynasty6-Jul-07 12:38 mughaldynasty 6-Jul-07 12:38  Hi, I have developed a web service and then I need to create a private UDDI registry for publishing that web service and allowing others to access UDDI for service consumption. Can some one help me that how can one create private UDDI registry (from start to end). I reed UDDI specification and lot of other stuff but I am not sure from where to start. FileStream Error ?? Richard Blythe6-Jul-07 9:13 Richard Blythe 6-Jul-07 9:13  I have written a class that stores user options throughout the program. (Color preferences, startup windows, etc.) When the program initializes, a FileStream object is used to open then file then a binary formatter is used to deserialize the stream. The FileStream is then closed. The problem is that when the program closes and the FileStream object trys to open the file to save the updated user options. A file exception is sometimes threw: "Cannot access file because it is being used by another proccess". Whats so annoying about the error is that it only happens SOMETIMES! A debugging nightmare! I assume that the object handle is not being released somewhere in memory. Can anybody give me any pointers on overcoming this problem? may your code be error free Re: FileStream Error ?? Not Active6-Jul-07 9:41 Not Active 6-Jul-07 9:41  Have you tried using ApplicationSettings? Is there a reason why you need something different than what is already available? only two letters away from being an asset Re: FileStream Error ?? Leslie Sanford6-Jul-07 10:07 Leslie Sanford 6-Jul-07 10:07  programmingAddict wrote: "Cannot access file because it is being used by another proccess" Make sure you only have one instance of your application running at any one time. This is a shot in the dark, admittedly, but when I've run into similar problems, it's been when I'm running an application in debug mode, it appears to crash for whatever reason, and I start another instance of the application. Unbeknownst to me, the previous instance is still lurking somewhere, still running and has not released its resources. Again, this may not have anything to do with your problem, but it's worth looking into. Use the Windows Task Manager to see what processes are running when you encounter this problem. Re: FileStream Error ?? Guffa6-Jul-07 10:47 Guffa 6-Jul-07 10:47  Telling from the symptomes, you are not closing the file stream properly. Sometimes the garbage collector is finalizing the object, which closes the file stream. What does your code look like for reading the file? --- single minded; short sighted; long gone; Re: FileStream Error ?? Luc Pattyn7-Jul-07 2:13 Luc Pattyn 7-Jul-07 2:13  I agree with Guffa. Showing all the code involved with opening, reading, closing the options file might give us a chance to give you some hint. Luc Pattyn [My Articles] [Forum Guidelines] Re: FileStream Error ?? Richard Blythe7-Jul-07 13:51 Richard Blythe 7-Jul-07 13:51  I would be happy to show you the code This class is being used in a VB.NET project. But I plan to use the framework in C# apps. 'Here is the code for Initializing (reading) the options class: If IO.File.Exists(_FileName) Then Dim fs As FileStream Try fs = File.Open(_FileName, FileMode.Open) Dim bf As BinaryFormatter = New BinaryFormatter() userOp = CType(bf.Deserialize(fs, Nothing), ArrayList) Catch ex As Exception MessageBox.Show(ex.Message) End Try Try fs.Close() fs.Dispose() Catch End Try End If GC.Collect() '************************ 'Here is the code for saving. (Where the error sometimes occurs) Public Sub SaveToFile() Dim fs As FileStream = Nothing Try 'where the error occurs fs = File.Open(_FileName, FileMode.Create) Dim bf As BinaryFormatter = New BinaryFormatter() bf.Serialize(fs, userOp) Catch ex As Exception MessageBox.Show(ex.Message) End Try Try fs.Close() Catch End Try End Sub Thanks for all the help! may your code be error free Re: FileStream Error ?? Luc Pattyn7-Jul-07 14:33 Luc Pattyn 7-Jul-07 14:33  Hi, I looked at your code (did not run it, I'm a C# guy) and have two suspicions and several comments; here they are: 1. it seldom is a good idea to have an empty catch block, since that really hides any problems that might occur; you should fix that. 2. rather than printing or showing Exception.Message I strongly advice everyone to always use Exception.Totring since that gives a traceback plus additional information depending on the kind of Exception, something Message cannot do (e.g. the full file name if a file fails somehow, but also some inner exception in case that occured) 3. the reason your fs.Close() is in a try-catch with empty catch is, I guess, that the file might not be open (because the open failed), hence now the close will fail, and you dont want to see that. Fair enough, but then you should test for it, as in: if fs!=Nothing fs.Close() // I hope this is correct syntax for "fs is not nothing" 4. I did not like GC.Collect() at the end of the reader. It seldom is wise to attempt and help the GC, it normally is smart all by itself. 5. suspicion 1: I did not like ths fs.Dispose() that is present in the reader (but not in the writer !?); I think it should not be there since fs.Close() takes care of all resources, and MSDN says File.Dispose() is new since 2.0 but should not be called ! Not sure how it would influence things tho. 6. suspicion 2: maybe, just maybe, your writing method is (sometimes) active while your reading mehtod is active too, on a different thread. Make sure it is not. If both do get called from different threads, try to devise a scheme in which the reader gets aborted so the writer can succeed (a simple lock might not be good enough since I guess you want to write upon app closure, and an ongoing reader should not delay the closure) You could inspect your code for threading stuff, and/or you could set a flag while the reader is busy (and clear it when it's done), and test for that flag inside the writer; doing so might confirm the occasional failure coincides with concurrent reading/writing. Hope this helps. Luc Pattyn try { [Search CodeProject Articles] [Search CodeProject Forums] [Forum Guidelines] [My Articles] } catch { [Google] } Asynchornous error ramdil6-Jul-07 8:58 ramdil 6-Jul-07 8:58  Hi i am using a udp client for recieving..i used beginrecieve method of udp client byte[] buff = new byte[1024]; soUdp.BeginReceive(new AsyncCallback(ReceiveCallback), buff); but when i execute i am getting an error An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full"} System.Exception {System.Net.Sockets.SocketException} Why is that coming Thanks in advance Regards DilipRam Re: Asynchornous error mav.northwind6-Jul-07 10:16 mav.northwind 6-Jul-07 10:16  Hi! Seems as if you got more than 1K of data reaching the port you're listening to. Try increasing buff to 4K and see if it's getting better. Regards, mav -- Black holes are the places where God divided by 0... Re: Asynchornous error Luc Pattyn6-Jul-07 16:14 Luc Pattyn 6-Jul-07 16:14  mav is right, your buffer is too small. there is a maximum packet size for TCP/IP (IIRD it is around 1500 B) and there is one for UDP, but I dont recall, might be the same number. Your buffer should be large enough to contain such packet. Luc Pattyn [My Articles] [Forum Guidelines] Re: Asynchornous error mav.northwind6-Jul-07 22:43 mav.northwind 6-Jul-07 22:43  Hi Luc! Just to clear things up: I think you refer to the MTU, not the maximum packet size for TCP/IP. The MTU (maximum transfer unit) is the largest chunk of data that can be transmitted unfragmented. For Ethernet, this is 1500 bytes (this leaves 1472 bytes of data for UDP because of 20 bytes of IP header and 8 bytes of UDP header). Once the amount of data to send is larger than this, it's split into single, smaller packets and transmitted separately. IP then reassembles the packets automatically so that you can have UDP packets with > 1472 bytes of data. I found a quite extensive overview of TCP/IP here[^], just in case you're interested. Regards, mav -- Black holes are the places where God divided by 0... Re: Asynchornous error Luc Pattyn7-Jul-07 1:48 Luc Pattyn 7-Jul-07 1:48  Hi mav, yes that's what was simmering in my memory. So there would be no maximum size at all ? Luc Pattyn [My Articles] [Forum Guidelines] Re: Asynchornous error mav.northwind7-Jul-07 4:03 mav.northwind 7-Jul-07 4:03  There is a maximum size, but it depends on the system you're working with; the way the TCP/IP stack is implemented. I think the absolute maximum will be 64K, but I've read that Sun machines only can handle 32K. But that's a rather theoretical limit because if you use such large UDP packets they are split into many single packages and if only a single packet gets altered or lost, the whole UDP datagram is discarded because it cannot be reassembled correctly. So you should keep the data in a single UDP packet as small as possible. Regards, mav -- Black holes are the places where God divided by 0... Re: Asynchornous error Luc Pattyn7-Jul-07 4:08 Luc Pattyn 7-Jul-07 4:08  Thanks for the info. Regards. Luc Pattyn [My Articles] [Forum Guidelines]

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