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Is there a control available for .Net (preferably with source - C# if possible) for selecting the columns of a fixed width text file?
I'm looking for something similar to Excel for the Text Import wizard (step 2 of 3) that provides the functionality for selecting the columns that the fields start.
Thanks,
cvogt61457
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Check this article[^] right here on CodeProject for this function. You may need to modify it to make a wizard-like control, but ti does the basic function of parsing a fixed-width or delimited text file.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Thanks for the help.
I'm looking for the UI portion - the part to select the columns graphically. The data reading and parsing is the easy part.
I did find this Column Definition Control[^]. I may have to convert this to C# for my use.
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question description:
I want to use notebook with a wireless netcard to acquire more than 3 Access Pionts(wireless router) signal strength. And using the GPSlike method to measure the position of the laptop.But I don't know how to get all the signal strength. When I use the class Atheros5000_80211_ReceivedSignalStrength of WMI, I can get only ONE singal strength with its property "Ndis80211ReceivedSignalStrength".And what should I do? I am puzzled.
PS:I am a beginner, and English is not my mother tongue, so please do not use too much Abbreviation,thank you very much.
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I'm not familiar with the Atheros class, but I know what you mean, I think. A wireless adapter in Windows can report multiple access points in range, and Windows can display all of them to let you choose which to connect to. So there must be a way to get this information from the adapter. It sounds like there should be an enumeration you can cycle through to find all detected stations and return their respective signal strengths. Since I don't know how to do that, I can only recommend that you dig more deeply into the WMI documentation, and try Google for "enumerating wireless access points" or some similar term. Perhaps my rewording of things will trigger some responses from more knowledgeable people - I hope so, as it sounds like an interesting problem.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Thank you very much! Enumerating SSID is very easy because there is a special class in WMI to get SSID, but I don't know how to get the corresponding signal strength.I'v searched for these key words,but got nothing. And I am trying to use DeviceIOControl() to get all the signals. Or DLLImport some exist VC++ dll file instead.
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I know this was answered in Quick Answer, but an FYI.
One, don't cross-post. By that I mean, post your question in one place and wait for an answer, not in two or more forums.
Secondly, if you solve your problem in one of these forums (not the quick answers) then edit the title so that it says solved.
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If I could have withdrawn from quick answer I would have so as to not double post. As it was I got my answer in the Quick Answer. So better that it remained there for visibility.
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As you had a reply to your message here, you would have been better editing your question to put a link to the QA version. As it is, there's now a dangling reply.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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I have been trying to solve the problem related with using dataRelation but still couldn't figure it out. I hope somebody can help me with this.
I have two repeaters used one nested another.
part of code is shown below:
void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
RepeaterItem item = e.Item;
if ((item.ItemType == ListItemType.Item) ||
(item.ItemType == ListItemType.AlternatingItem))
{
Repeater2 = (Repeater)e.Item.FindControl("Repeater2");
DataRowView drv = (DataRowView)item.DataItem;
Repeater2.DataSource = drv.CreateChildView("categoryItem");
Repeater2.DataBind();
}
}
This categoryItem is from this code:
objDA.Fill(ds);
DataColumn c1 = ds.Tables["category"].Columns["ID"];
DataColumn c2 = ds.Tables["Item"].Columns["catID"];
dRel = new DataRelation("categoryItem", c1, c2);
ds.Relations.Add(dRel);
Repeater1.DataSource = ds;
Repeater1.DataBind();
And the error message is:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 1222: objDA.Fill(ds);
Line 1223:
Line 1224: DataColumn c1 = ds.Tables["category"].Columns["ID"];
Line 1225: DataColumn c2 = ds.Tables["item"].Columns["catID"];
Line 1226: dRel = new DataRelation("categoryItem", c1, c2);
Well the "ID" of table "category" is the foreign key in "item" table and that foreignKey name in the "item" table is "catID".
Any help will be appreciated..
I really need some help in this.
suchita
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Line 1222: objDA.Fill(ds);
may objDA is null or ds ^^
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thanks for the reply .
ds is not null. If i show the values of ds in datagrid, all those data is shown with no problem..
Grid1.DataSource = ds;
Grid1.DataBind();
the above code is running well.
error is showing on the line 1224 .. 
suchita
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than objDA will be null the exception is NullReferenceException that implicit says that one object is null at the run time set breakpoints and check if all vars you use are not null.
bless
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thanks for the reply again.
it is showing error in line 1224 but since my ds has all the data , i dont know why the error in this line ?
suchita
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Line 1224 consists of multiple statements:
Line 1224: DataColumn c1 = ds.Tables["category"].Columns["ID"]; I suggest you cut it up into multiple lines, with a breakpoint on each line.
What does ds.Tables["category"] evaluate to? Does that new object have a column labeled "ID"?
SayamiSuchi wrote: i dont know why the error in this line ?
One of those statements on that line evaluates to null.
I are Troll 
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You're having trouble debugging?
Start here[^] in order to learn how to inspect those values.
I are Troll
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objDA is probably null
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objDA is filling ds. ds is getting value.. isn't that means objDA has value ?? Or is there anyway to check the data inside objDA?
Thanks,
suchita
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I can't tell what is wrong by seeing only some part of the relevant code.
if you think everything is correct, how come the exception?
now replace
objDA.Fill(ds);
...
by
try {
if (objDA==null) MessageBox.Show("Oh dear, objDA seems to be null");
objDA.Fill(ds);
...
} catch(Exception exc) {
MessageBox.Show("exception: "+exc.ToString());
}
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Don't take it personal SayamiSuchi. Luc is not partial to any codeproject member. He gripes at all of us! 
The mind is like a parachute. It doesn’t work unless it’s open.
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You know pretty well an open mind is the numero uno prerequisite when debugging some code...
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Thank you for the reply.
my code
DataColumn c1 = ds.Tables["category"].Columns["ID"]; is throwing that error. but since my dataset has values, i dont know how come that error ?
suchita
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When I use a DataAdapter to fill a DataTable, I have to manually set the DataTable's name.
If the same logic applies, You may need to manually set the names of your DataSet tables.
The mind is like a parachute. It doesn’t work unless it’s open.
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