C# Discussion Boards - CodeProject

Re: Problems of reading file content

1-Feb-10 4:25

Well, I would suggest you learn about the platform you want your program to operate on, before trying to write any code.

MVP 2010 - are they mad?

codenoobie1-Feb-10 19:02

codenoobie

1-Feb-10 19:02

I've found out that the pocket excel actually couldn't read files in csv or xls format, so I just have to save the file into txt format. Thereafter, the file can be read.

C# Vb6.0 Com Interop

Q2A31-Jan-10 21:33

Q2A

31-Jan-10 21:33

Hello,
I have a function say

<br />
public void GetMeString(out string myStr)<br />
{<br />
   myStr = "ABC";<br />
}<br />

This function resides in a C# library and the class for this function is COM visible. Can you please let me know how do I call the function in VB and get the value.
I tried:
Dim var as MyClass
Set var = New MyClass
Dim str As String
var.GetMeString(str)

But str is always empty... Cry | :((

Richard MacCutchan1-Feb-10 0:18

1-Feb-10 0:18

Q2A wrote:
var.GetMeString(str)

I don't know VB but in C# I think that should be var.GetMeString(out str);

MVP 2010 - are they mad?

Thomas Krojer1-Feb-10 1:29

Thomas Krojer

1-Feb-10 1:29

byref

Richard MacCutchan1-Feb-10 2:00

1-Feb-10 2:00

Of course; perhaps you could explain to the OP what he/she needs to do?

thanks.

MVP 2010 - are they mad?

Thomas Krojer1-Feb-10 6:25

Thomas Krojer

1-Feb-10 6:25

var.GetMeString(byref str)

Richard MacCutchan1-Feb-10 6:34

1-Feb-10 6:34

No, I asked you to post this to the OP; I don't really care about it.

MVP 2010 - are they mad?

Thomas Krojer1-Feb-10 20:40

Thomas Krojer

1-Feb-10 20:40

I´m sure he read it

Richard MacCutchan1-Feb-10 23:22

TreeView Nodes do not update

1-Feb-10 23:22

Thomas Krojer wrote:
I´m sure he read it

Experience suggests I'm just as sure he didn't.

MVP 2010 - are they mad?

googoojkhan31-Jan-10 19:38

googoojkhan

31-Jan-10 19:38

I want to fill a treeview with rows of a datatable that have already been stored in a database. I used a code like this:(Obj is the returned row)
(the root node have been specified before and I want to put just the child nodes)

foreach (TreeNode tn in treeView1.Nodes)
{
    if (tn.Text == Obj[8].ToString())
    {
        TreeNode NewNode = new TreeNode();
        NewNode.Name = Obj[0].ToString();
        NewNode.Text = Obj[10].ToString();
        tn.Nodes.Add(NewNode);
        treeView1.SelectedNode = NewNode;
        treeView1.SelectedNode.Expand();
    }
}

But only one child is added to the treeview and after that it seems that the number of nodes of the tree do not change (update) and still remains 1. How should I update the treeview after a node added to it?
Thanks so Much In Advance!
Good Luck!

googoojkhan31-Jan-10 21:14

googoojkhan

31-Jan-10 21:14

Please Help!

Alex Manolescu31-Jan-10 21:28

Alex Manolescu

31-Jan-10 21:28

hi,
Comparation of the two strings is wrong:

if (tn.Text == Obj[8].ToString())

Correct:

if (tn.Text.CompareTo(Obj[8].ToString()) == 0)

Cheer's,
Alex Manolescu

Covean31-Jan-10 23:09

Covean

31-Jan-10 23:09

Sorry to say it so, but I don't know what this answer should help.
Both functions determine the same result.
And also both crash if Obj is null.

And finally here so funny text from MSDN:

"Caution:

The CompareTo method was designed primarily for use in sorting or alphabetizing operations. It should not be used when the primary purpose of the method call is to determine whether two strings are equivalent. To determine whether two strings are equivalent, call the Equals method."

Sorry for the "downvoting", but your answer is simply wrong.

Greetings
Covean

Displaying Two Crystal Reports using Single CrystalReportViewer.

Alex Manolescu31-Jan-10 23:57

Alex Manolescu

31-Jan-10 23:57

Dear mate,
until this i taught the Equals method compare objects instances and the CompareTo method compare values.
I've search a little more and see that the Equals method for String is overriden to compare values.
In objects case the Equals method compare instances..

However the result is the same if you use CompareTo or Equals Smile | :)

, so thanks for the tip!
Every day you learn something! Smile | :)

Cheer's,
Alex Manolescu

Sanket.Patil31-Jan-10 19:04

Sanket.Patil

31-Jan-10 19:04

Hello Everybody........!

I've one problem. Please Help.

I have developed my project in VS2008. Noe it is to the final stage of completion. My All Crystal Reports are running properly.
The Only Problem I've is I need to run two crystal reports using single CrystalReportViewer.
So Please Tell me is it possible? If yes, How?

Thanks & Regards

Pankaj Patil

Re: Displaying Two Crystal Reports using Single CrystalReportViewer.

basu.sit29-Mar-10 18:51

basu.sit

29-Mar-10 18:51

Hi Pankaj,

Using subreports you can do this.

1. You have alredy 2 reports like Test1.rpt and Test2.rpt OK.

2. Take onother Blank report like Main.rpt, [attach Test1.rpt SP or any], devide the details section like Details a & Details b --> for deviding detail section right click on Main.rpt -> select Sectiopn Extert -> select Details -> click on insert button
3.Then Click on sub report on top menu of the Main.rpt report --> Insert Subreport window is displaying -> select subreport tab -> choose existing report [Test1.rpt]with help of browse button - > Then select the Link tab -> set the parameter -> Click OK
4. one link is attached with cursor place it in Main.rpt Details a section
5. then repeate the step 3 for attaching Test2.rpt file -> place it in Details b section of the Main.rpt
6. In u r application cal the Main.rpt file instead of Test1.rpt
7. for allignment do some changes using Format Subreport [Righ click & select]

Thanks,
Basu Malipatil

AxFramerControl for powerpoint preview

jafaralik31-Jan-10 18:46

jafaralik

31-Jan-10 18:46

Hi,

Anybody can help me to solve this problem.

I trying to open a powerpoint file(for preview) in my application using AxFramerControl.

axFramerControl1.Open(fileName, true, "PowerPoint.Show", null, null);
.....
.....
axFramerControl1.Close();

It is opening the file in my application, but after closing the file i am trying to delete the file.
File.Delete(filename);
In this case i am getting an error "Cannot delete access denied". i think it is problem with axFramerControl1.Close(), it is not closing the application properly. Can anybody tell me how to close the Framercontrol correctly to delete the file.

thanks in advance
Jafar K

Looping through a CSV with threads

Danpeking31-Jan-10 15:50

Danpeking

31-Jan-10 15:50

Hi, I've recently started using Windows forms and need to create many threads which loop through a given CSV and process the contents to a method. I'm not sure of the best way of doing this. I can create a few threads but each thread processes each line rather than 1 line being processed by one thread and the next line being processed by another thread. The first value is a unique identifier if that helps.
Hope I've explained it ok, can anybody please advise?
Thanks

PIEBALDconsult31-Jan-10 15:57

PIEBALDconsult

31-Jan-10 15:57

I would expect that one thread should read the file and place each line in a Queue. Then several other threads can read from the Queue and proceed from there.

Luc Pattyn31-Jan-10 16:26

Luc Pattyn

31-Jan-10 16:26

Hi,

you could open a streamreader on the file, then launch a few threads all executing the same code, containing this pseudo-code:

while(!allDone)
    lock the streamreader (or some other object)
    read one line from the streamreader, and set allDone true if no more data available
    unlock again
    process the line read, if any
}

allDone is a bool, starting false, shared by all threads.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that.
[The QA section does it automatically now, I hope we soon get it on regular forums as well]

modified on Sunday, January 31, 2010 10:44 PM

PIEBALDconsult31-Jan-10 17:05

PIEBALDconsult

31-Jan-10 17:05

I'm just not convinced that that will yield a significant performance boost. And I suspect that decoupling the reading and processing will yield a more-maintainable system.

Luc Pattyn31-Jan-10 17:19

Luc Pattyn

31-Jan-10 17:19

Neither am I, however the OP stated "need to create many threads", so I must assume those threads will be busy outside the lock most of the time, in which case I don't need code to read the entire file and pump it through a queue.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly formatted, adding PRE tags is the easiest way to obtain that.
[The QA section does it automatically now, I hope we soon get it on regular forums as well]