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This is exactly what I am looking for. I have it implemented, but there is probably any error in my coding, becouse on borders of result image I have processed pixels from opposite sides of tiles.
Do you know about any code that is doing that correctly?
Or is it normal? Must be used overlapping of input tiles?
Thanks
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sorry, i don't know of any code that does this.
but, that document spends a lot of time talking about how to arrange your kernel to handle the wrap-around problem.
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HI all,
I've written an app that tries to have the main thread sleep while one or more (usually 2) threads idle in the background, each one waking up every X number of minutes to do a data transfer.
For some reason the Private bytes of the app are rising in small but constant increments each time each thread wakes up, and I can't see what I can do to make sure there's nothing hanging around in memory so that I can leave the programme unattended.
(I need to leave this program running on a live server for a long period, so proper use of disposal is really important.)
Main()
{
LaunchThreads(syncNodes);
}
static void LaunchThreads(XmlNodeList syncThreads)
{
foreach (XmlNode threadSetting in syncThreads)
{
Sync syncThread = new Sync(threadSettings);
Thread t = new Thread(new ThreadStart(syncThread.Start));
t.Start();
}
}
}
public class Sync
{
private XmlElement settings;
private int period;
public Boolean interrupt
public Sync(XmlElement syncSettings)
{
settings = syncSettings;
interrupt = false;
period = Convert.ToInt16(settings.GetAttribute("period").ToString())*60000;
}
public void Start()
{
while(!interrupt)
{
Execute();
Thread.Sleep(period);
}
}
private void Execute()
{
}
}
modified on Thursday, September 1, 2011 11:05 AM
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c4tchm4tt wrote: For some reason the Private bytes of the app are rising in small but constant increments each time each thread wakes up, and I can't see what I can do to make sure there's nothing hanging around in memory so that I can leave the programme unattended.
Well, .NET does use a non-deterministic garbage collector.
The garbage collector in .NET prefers to do garbage collection rounds as they are needed. This is a good basic read on it: http://msdn.microsoft.com/en-us/library/0xy59wtx.aspx[^]
If you want to test if you are truly leaking, try this: sleep your main thread for a certain amount of time (rather than -1 now), after which the private bytes have gone up quite a bit. Then issue a GC.Collect() and sleep again. See if that works.
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Hm, well tried that and didn't see any change, besides GC doesn't pop up after unmanaged memory which this would be wouldn't it?
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What makes you think the memory is unmanaged?
At any rate, you are sure the GC call didn't help? So you first let the threads wake up a couple of times, building up private bytes, and then you did a GC collect? And that didn't reduce the memory usage? It's quite hard to 'leak' memory in a .NET application.
Are you allocating any unmanaged memory, or calling unmanaged functions and/or keeping handles, etc.?
The worst case for a full managed application is that you are creating a lot of objects and are keeping all the references, meaning the GC can't collect.
Please describe why you believe there seems to be a memory problem, other than private bytes increasing (which is pretty normal). See http://stackoverflow.com/questions/1984186/what-is-private-bytes-virtual-bytes-working-set[^] for instance, the first (highest ranked) answer.
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Unrelated, but... maybe you want a Windows Service?
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Yeh, a windows service is what ti wil become but I wanted to get a hang of threading and memory management before I ran chasing after service bugs!
I looked at the service template (provided on this site) which looks great but a background worker thread which I understand I would use I think eneds more or less demands the same kind of approach to the above code, so I'm predicting I'd still end up with a memory issue, what do you think?
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c4tchm4tt wrote: I'd still end up with a memory issue
You might, but neither technique seems more prone.
c4tchm4tt wrote: a background worker thread
Some people use those, but I choose to use a System.Timers.Timer for my Windows Services.
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how can make master page in C# window application form...?
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Check this [^]
I Love T-SQL
"VB.NET is developed with C#.NET"
If my post helps you kindly save my time by voting my post.
www.cacttus.com
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What do you think a "master page" is ?
best, Bill
"In the River of Delights, Panic has not failed me." Jorge Luis Borges
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Do you mean a MDI container?
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There is no concept of master pages in Windows Forms.
Searching on the internet may provide you with some workarounds.
Too much of heaven can bring you underground
Heaven can always turn around
Too much of heaven, our life is all hell bound
Heaven, the kill that makes no sound
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May be a "inherited form" will help you(I guess so)
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i try to connect to dbf database using C# (i try 3 types of connection)
string connectionString = @"Driver={Microsoft dBASE Driver (*.dbf)};DriverID=277;Dbq=c:\employees.dbf;";
string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\employees.dbf;Extended Properties=dBASE IV;";
string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\employees.dbf;Extended Properties=dBASE IV;User ID=Admin;Password=;";
using (OdbcConnection connection = new OdbcConnection(connectionString))
{
connection.Open();
}
and i got error
error1:
ERROR [HY024] [Microsoft][ODBC dBase Driver] '(unknown)' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.
ERROR [IM006] [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed
ERROR [HY024] [Microsoft][ODBC dBase Driver] '(unknown)' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.
or error2:
ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
what can be the problem ?
thanks in advance
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goldsoft wrote: '(unknown)' is not a valid path.
goldsoft wrote: Data source name not found
Both errors seem to be saying the same thing. The file does not exist where you say it should be.
Live for today. Plan for tomorrow. Party tonight!
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Hi,
Maybe try to escape backslashes in your connection string (i.e., write \\ instead of \ ).
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No need to try; it's a verbatim[^] string; C# doens't interprete them as escape-sequences when prefixed with the @-sign.
Bastard Programmer from Hell
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The two last ones are OleDB drivers, not ODBC drivers. If it is giving you an ODBC driver error it means that it is expecting an ODBC. Since it seems to be a DBase IV database I doubt there even is an OleDb driver for it.
Did you check this[^] site? it might help.
Also make sure the dbf file is actually in the C drive. looks like a weird place to put it IMHO.
Hope this helps.
V.
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Hi everybody,
on the portal http://www.blackbeltfactory.com (previusly targetting java) we try to develop community for C# and SQL Server training.
I do hope some of you will also find it useful to support this idea with their knowledge.
Regards
Gsue44
(please forgive if you take it as spam. that was not my intention)
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Hi all,
I am trying to implement read and write functionality between DataGridViewload controls and an XML file.
The code to write the the XML file is as follows
DataTable dt_csk = new DataTable("CONTROL_KEYS");
dt_csk.Columns.Add("key", typeof(System.String));
dt_csk.Columns.Add("value", typeof(System.String));
for (idx = 0; idx < dgv_csk.Rows.Count; idx++)
{
dt_csk.Rows.Add(dgv_csk[0, idx].Value.ToString(), dgv_csk[1, idx].Value.ToString());
}
dt_csk.EndLoadData();
dt_csk.AcceptChanges();
dgv_csk.DataSource = dt_csk.DefaultView;
I then add all DataTables to a DataSet like so
DataSet ds = new DataSet();
ds.Tables.Add(dt_csk);
ds.Tables.Add(dt_cdk);
ds.Tables.Add(dt_cak);
ds.WriteXml(logfile, XmlWriteMode.IgnoreSchema);
I read the XML into the DataGridView elements as follows:
XmlDataDocument xmldata = new XmlDataDocument();
xmldata.DataSet.ReadXml(xml_filename);
dgv_csk.DataSource = xmldata.DataSet;
dgv_csk.DataMember = "CONTROL_STATIC_KEYS";
This works great but there is one problem.
PROBLEM When I import info from the XML file, there is one additional row that is blank in each DataGridView control. I have some other functions where I use the number of rows in the DGV as an index, and this additional row is screwing things up.
Could you tell me what I am doing wrong?
Thanks!
N.
modified on Monday, August 29, 2011 1:57 AM
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If user click dates
such as 2008-06-12 ~ 2011-09-25
I want to get year, month different not days.
example) 3years 2month
I am using TimeSpan function.
but this function only show day's difference.
hi
My english is a little.
anyway, nice to meet you~~
and give me your advice anytime~
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How long is a year?
As you found, TimeSpan won't/can't do that, but you can probably do it manually.
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