Opening file with in its application - C# Discussion Boards

Re: How to call unmanaged C++ DLL in C#.NET

10-Nov-09 20:21

Pranav Thakur wrote:
After running the above code i am getting error like : Unable to find an entry point named 'testMethod' in DLL 'C:\Project1\TestProject\Debug\TestProject.dll'. Can any one suggest how to run the above code successfully.

Write a dll that exports testMethod, that's what the error is telling you.

I would also not use full paths, just let the dll be in the same dir as the exe.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Nicholas Butler11-Nov-09 1:24

Nicholas Butler

11-Nov-09 1:24

C++ mangles names. Declare your exported C++ functions like this:

C++

extern "C"
{
  __declspec(dllexport) int Function( ... );
}

Nick

----------------------------------
Be excellent to each other Smile | :)

Re: How to call unmanaged C++ DLL in C#.NET

suzalinda3-Dec-09 12:50

suzalinda

3-Dec-09 12:50

I have a dll file. The dll file has functions like that

"typedef short apiStatus;

apiStatus __declspec(dllexport) __stdcall DrfCommOpen (HANDLE * hCom, char *com_port);"

how i can call and use this function in my c#.net application?

thanks in advance..

regards..

Windows Form updating problem

MathewPV10-Nov-09 19:06

MathewPV

10-Nov-09 19:06

I got a bug in the application which is as follows

When i am doing login to my application, welcome window will come with the login name and at the same time the update page will also be shown minimized... at this time i can do the modification in name and i press the update button it will make the changes to the welcome window.. but when i close this update page and reopen the same.. and i perform the same task again. it is not getting updated in the welcome window..

Any idea for this bug to be cleared..

Re: Windows Form updating problem

Christian Graus10-Nov-09 19:35

Opening file with in its application

10-Nov-09 19:35

Fix your code. Hard to say more, based on your description. Post some code perhaps, explain how you've used the debugger to diagnose the issue, etc.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

ListView annoying

Xmen Real 10-Nov-09 19:00

Xmen Real

10-Nov-09 19:00

Im doing some operations in BackgroundWorker's DoWork event. So when I call the following line, it works good but when I call second one it shows "Cross-thread operation not valid" error.

backgroundWorker1.ReportProgress(((b + 1) * 100) / listView1.Groups[a].Items.Count, new object[] { 1, listView1.Groups[a].Items[b].SubItems[0].Text });

backgroundWorker1.ReportProgress(((b + 1) * 100) / listView1.Groups[a].Items.Count, new object[] { 1, listView1.Groups[a].Items[b].Index });

I know how to fix this error. But my question is why its not raising with first line ??

I tried with DGV and it works good.

TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>

-----------------------------------------------
128 bit encrypted signature, crack if you can

Hum Dum10-Nov-09 18:21

10-Nov-09 18:21

I am working on window application.
On a list view i am storing names of file.

when we double click a file in widows folder, the file gots open into its default application. (as suppose there is text file, and we click it, then it got opened in notepad).

Is there way to achieve the same with in application. So that user click on file name, and file got opened in its application.

any help/link much appreciated.

regards,

Christian Graus10-Nov-09 18:32

10-Nov-09 18:32

Hum Dum wrote:
Is there way to achieve the same with in application. So that user click on file name, and file got opened in its application.

You mean associate a file with your app ? That's done in the registry, and your app needs to take a file path on the command line and open it.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Hum Dum10-Nov-09 20:25

10-Nov-09 20:25

Christian Graus wrote:
You mean associate a file with your app ?

Not really......!!

when we double click a file say of any extension, it got opened in its application(which is associated with it).

i just want that. I am storing filename only (file remain in a folder), and wants when user click on the filename. It got opened.

Or say just making a list of file present in specific folder(wheteher its .txt, .rtf, .doc, .pdf etc).
Now just wants whenever user click on particular filename, it got opened(not go to that folder and fron there open that file).

regards

dan!sh 10-Nov-09 19:00

dan!sh

10-Nov-09 19:00

There is an article here at CP which shows how to do file association. Search for it.

It's not necessary to be so stupid, either, but people manage it. - Christian Graus, 2009 AD

Hum Dum10-Nov-09 20:26

10-Nov-09 20:26

Luc Pattyn11-Nov-09 1:31

Luc Pattyn

11-Nov-09 1:31

That is called "associating a file extension with your app"
really.
you got the right answer twice.
And if you are going to contradict the truth one more time, you're a moron.

Unsure | :~

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

hollismarek11-Nov-09 11:00

hollismarek

11-Nov-09 11:00

I don't think he wants to associate a file extension with his program, I think he wants to be able to open an external file in the appropriate program.

Hum Dum, if I'm correct you just need System.Diagnostics.Process.Start(). So if you have a file at C:\testfile.txt and you want to open it in Notepad you could just do something like this:

System.Diagnostics.Process p = new Process();   
p.StartInfo = new System.Diagnostics.ProcessStartInfo("C:\testfile.txt");
p.Start();

Hum Dum11-Nov-09 20:20

11-Nov-09 20:20

Thanks for reply.

hollismarek wrote:
I think he wants to be able to open an external file in the appropriate program.

Absolutly correct.

But one question related to this process,

Is it going to slow or create any overhead on my application ?
as user will click many times to open a file.

for that i have to run each time this.

hollismarek12-Nov-09 2:34

hollismarek

12-Nov-09 2:34

If you dispose of the process object after calling Start I think you should be ok.

Hum Dum11-Nov-09 20:17

Re: Problem with BCP in C#

11-Nov-09 20:17

Luc Pattyn wrote:
you're a moron

I suppose this forum is for help, not for shouting Confused | :confused:

I am just clearing my doubts,
If its related with file association, then i will do it.

But for just opening a file doing all this association ??
I am just looking for simple solution.

But with reply like that...

"I am understanding how mature you are...!!"

Problem with BCP in C#

sudhirBirlapur10-Nov-09 18:02

sudhirBirlapur

10-Nov-09 18:02

I am working on this application(asp.net 1.1,sql server 2000) that has a huge database , in the frontend there is a provision

to generate a csv file by running a stored procedure which can fetch 50000 records(approx), to acieve this I've used the

following:-
1) running forloop iterating through the dataset and creating a comma separated string, then creating the csv file, but this

process slows down the server immensely when data fetched is huge.
2) DTS packages is failing, because when I am creating a new package and click the defeine column button, the SQL Enterprise

manager just closes itself after a few seconds.
3) BCP command, sometimes works sometimes does not. The code used for running bcp in C# is :-

System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = "bcp";
proc.StartInfo.UseShellExecute = false;
proc.StartInfo.RedirectStandardError = true;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.Arguments = @"""exec ETH11.dbo.usp_DownloadInvoiceforDalkia "" queryout ""D:\NewLookLogs\Invoice.csv"" -c -t ,

-T -S";
proc.StartInfo.Arguments = proc.StartInfo.Arguments.Replace("usp_DownloadInvoiceforDalkia ","usp_DownloadInvoiceforDalkia

"+"'"+xSupplierID+"',"+"'"+xBuyerID+"',"+"'"+xFromDate+"',"+"'"+xToDate+"',"+"'"+xType+"',"+""+xCurrentOnly+","+""+xDateType+

","+""+xStatus+","+""+xAllStatus+","+""+xContentType+","+"'invoice.csv',"+"'"+Session.SessionID+"'");
proc.Start();
proc.WaitForExit();

Christian Graus10-Nov-09 18:17

List element copying problem

10-Nov-09 18:17

please don't cross post.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Charlesh310-Nov-09 15:35

Charlesh3

10-Nov-09 15:35

A few months ago some of you helped this hardware engineer with a c background understand that list elements are passed by reference. I solved my immediate problem but have run into another wall.

I have two global lists defined in my form:

            List <CUserMem> MemoryBank = new List<CUserMem>(100);
            List <CUserMem> CombinedMemories = new List<CUserMem>(100);

After a while, the first list becomes has out of date info and I must "garbage collect" by copying the still-needed elements of the first list to the second list. I simply do :

            CombinedMemories[Index].whateverelement = MemoryBank[AnotherIndex].whateverelement;

It works the first time through but of course the next time I update MemoryBank, CombinedMemories is also updated. I tried to avoid this by:

            local (temporary) variable = MemoryBank[AnotherIndex].whateverelement;
            CombinedMemories[Index].whateverelement = local (temporary) variable;

That doesn't work. After the local variable is destroyed, the two list elements still have the same reference.

So what is the correct way to work with 2 global lists like this?? Can I create a copy of the first list that is not "linked" (have the same reference)???

Thanks -

Chuck

Chuck

Luc Pattyn10-Nov-09 15:41

Luc Pattyn

10-Nov-09 15:41

1. Please tell us more about CUserMem and whateverelement so we can help you better.
2. Is it the intention to have each item in one of the lists, but never in both of them?

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Gerry Schmitz10-Nov-09 17:32

Gerry Schmitz

10-Nov-09 17:32

CombinedMemories[Index].whateverelement = (cast as appropriate) MemoryBank[AnotherIndex].whateverelement.MemberwiseClone();

This will give you two separate objects with the same contents instead of multiple references to the same object.

Re: List element copying problem [modified]

Charlesh311-Nov-09 8:09

Charlesh3

11-Nov-09 8:09

Gerry:

Thanks fot taking the time to reply.

I had seen a couple of references to the fact that cloning a List just copies the references, so you end up with the same problem I started with. See: http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/de75a3c3-2920-48ae-bf85-0399e5ee7a10   and also http://weblogs.asp.net/jeff/archive/2005/11/21/431125.aspx .

But wanting to give it a try anyhow, I took your advice and used MemberwiseClone with your syntax:

                              CombinedMemories[NumberOfCombinedMemories].bUsed = (Boolean) MemoryBank[i].bUsed.MemberwiseClone();

but get the following error:

Error     3     Cannot access protected member 'object.MemberwiseClone()' via a qualifier of type 'uint'; the qualifier must be of type 'WindowsFormsApplication1.Form1' (or derived from it)

This I do not understand.

Chuck

Gerry Schmitz11-Nov-09 11:38

Gerry Schmitz

11-Nov-09 11:38

Chuck,

I had to make a few assumptions from your original post, assuming you wanted to "clone" a "member" in the list, and not the list itself.

Anyway, cloning a "list" would clone "references" for a "shallow" clone; but would create new objects for a "deep" clone. Same with cloning a single object; shallow cloning would create references for "fields" in the oject that referenced other objects, but would create new objects referenced for by those fields for a deep clone.

Anyway, here is an example of how I understood your problem in the first place; cloning an "element" (ie. object) from one list to another where that element / object does not reference other objects:

(Note that strings, while being reference types, are "deep" cloned in this case ... )

<pre>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1 {

   class Program {

         static List<Widget> List1 = new List<Widget>();
         static List<Widget> List2 = new List<Widget>();

         static void Main( string[] args ) {

            List1.Add( new Widget() {
                  Description = "I am a Widget",
                  OtherData = "12345"
            } );

            List2.Add( List1[ 0 ] );

            Display( "@1" );

            List1[ 0 ].Description = "I was changed";
            List2[ 0 ].OtherData = "abcde";

            Display( "@2" );

            List2[ 0 ] = List1[ 0 ].MemberwiseClone();
            List1[ 0 ].Description = "I was cloned";
            List2[ 0 ].Description = "I am the clone";

            Display( "@3" );
         }

         public static void Display( string location ) {
            Console.WriteLine( location + " List1 = {0}; List2 = {1}",
                  List1[ 0 ].ToString(), List2[ 0 ].ToString() );
         }
   }

   class Widget {
         public string Description;
         public string OtherData;

         public new Widget MemberwiseClone() {

            return ( Widget ) base.MemberwiseClone();
         }

         public override string ToString() {
            return Description + "(" + OtherData + ")";
         }
   }
}

</pre>

modified on Wednesday, November 11, 2009 5:46 PM