Visual Basic

Richard MacCutchan9-Dec-09 3:49

9-Dec-09 3:49

Look what I found[^] in two seconds, rather than two weeks.

EvanSaunders9-Dec-09 20:50

EvanSaunders

9-Dec-09 20:50

Hey There

Thanks for the reply...much appreciated.
I tried googling the problem, but kept being left short of actually completing the task.
I can add the combobox, just not update it as I see fit.
I will attempt this again...hopefully your link helps. (Have already looked at a few)

Regards

The sarcasm in your message is noted... but thanks!

Richard MacCutchan9-Dec-09 23:22

9-Dec-09 23:22

EvanSaunders wrote:
The sarcasm in your message is noted... but thanks!

Not very subtle I know, but it's amazing how many questions posted here could be, at least part-way, solved by a simple Google search. Often the top hit on the search is a CodeProject article.

Process.start wait for a callback

EvanSaunders9-Dec-09 23:27

EvanSaunders

9-Dec-09 23:27

It's not a big deal about the sarcasm, just noted it. Smile | :)

To be honest, I have Googled this quite a lot, and all the results come up short on the last bit of detail, which is to have a different comboBox for each row, or changing an item in the comboBox for a particular row.
Each method that I implement from what I Googled showed different ways of adding a comboBox Column, but then the comboBoxes are the same for each row. That worked for some parts of my program, but others required differences.

I appreciate your feedback (sarcasm and all), and I am glad to announce that I have finally fixed the problem, with not so much help from Google (I probably browsed more than 15 different sites, just today) Frown | :(

Thanks!

coolpjmartin9-Dec-09 0:47

coolpjmartin

9-Dec-09 0:47

Hi, I have two .net application (exe). Prog1 and Prog2

What I would like to do is run the first program (prog1) and then from "prog1" run the second prgram "prog2"

at this point I want "prog1", to wait until "prog2" (does not exit) but gets to a certain point in its process, so I will need to send a callback to "Prog1"

I know I can use process.start to call the second program, and I can also wait until the program has exited, but what I cannot work out is how to wait until a call back is recieved and send that callback to prog1.

Can anyone help please

c# or vb.net I don'y mind.

nlarson119-Dec-09 3:44

nlarson11

9-Dec-09 3:44

There maybe a more politically correct solution but...

You could instead of using process.start, use loadassembly. Then either pass a delegate into proj2 and have it invoke it when it gets to the point you refer to or you could also use an event to trigger the action (your choice obviously).

'Never argue with an idiot; they'll drag you down to their level and beat you with experience.' ~ anonymous

'Life's real failure is when you do not realize how close you were to success when you gave up.' ~ anonymous

richardw489-Dec-09 5:51

richardw48

9-Dec-09 5:51

Not sure if this will work but...
could you not make prog1 com visible and then expose the function in prog1 that you want prog2 to call when it gets to a specific point in its processing?
I've used this process to get jscript code sitting behind an Internet Explorer page to call a function in my vb.net app

Alan N9-Dec-09 7:25

Alan N

9-Dec-09 7:25

Hi,
You need interprocess synchronization! There are several methods, but as I'm not an expert at this I'll just give one simple and possibly naive example using a named mutex.

Process1:

using System;
using System.Diagnostics;
using System.Threading;
static void Main() {
  String mutexName = Guid.NewGuid().ToString();
  Process p = Process.Start(@"Process2", mutexName);
  Console.WriteLine("Waiting for Process2 to create the mutex {0}", mutexName);
  Mutex m = null;
  do {
    try {
      m = Mutex.OpenExisting(mutexName);
    } catch (WaitHandleCannotBeOpenedException) {
      Thread.Sleep(50);
    }
  } while (m == null);

  // wait for mutex release
  Console.WriteLine("Process1 has opened the mutex, waiting for release");
  if (m.WaitOne(20000)) {
    Console.WriteLine("Mutex was released");
  } else {
    Console.WriteLine("Wait period exceeded");
  }
  Console.WriteLine("Press enter to exit");
  Console.ReadLine();
}

Process1 starts Process2 passing the desired name of the synchronisation object.
Process1 then polls until the Mutex has been created by Process2.
Process1 can now wait for Process2 to release the Mutex.

Process2:

static void Main(String[] args) {
  Console.WriteLine("Process2 created mutex {0}", args[0]);
  Mutex m = new Mutex(true, args[0]);
  Console.WriteLine("Process2 simulating work for 5 seconds ...");
  Thread.Sleep(5000);
  m.ReleaseMutex();
  Console.WriteLine("Process2 released mutex ...");
  Console.WriteLine("Process2 doing something else ...");
  Thread.Sleep(5000);
  Console.WriteLine("Press enter to exit");
  Console.ReadLine();
}

There are several articles here on CodeProject. Try searching for interprocess communication or synchronisation.

Alan.

coolpjmartin18-Dec-09 6:01

coolpjmartin

18-Dec-09 6:01

thank you very much , this is exactly what i need, excellent thanks

Image not uploading

dcdhingra9-Dec-09 0:32

dcdhingra

9-Dec-09 0:32

Hi,

I am developing a vb.net application in which i uploading some paramenters which is given below "FirstName,MiddleName,LastName,MyImage".

Uploading is done successfully but image is not showing at webpage. It is uploading FirstName, MiddleName, LastName not Myimage.

My Code is below:

myUri = New Uri("https://www.mysite.com/apis/CreateMyContact.cfm")

data = data.Append("&FirstName=" & System.Web.HttpUtility.UrlEncode(Dharm))

data = data.Append("&MiddleName=" & System.Web.HttpUtility.UrlEncode(Chand))

data = data.Append("&LastName=" & System.Web.HttpUtility.UrlEncode(Dhingra))

data = data.Append("&NickName=" & System.Web.HttpUtility.UrlEncode(Dharmu))

Dim fs As System.IO.FileStream = Nothing
Dim imgByte() As Byte = Nothing
Try
fs = System.IO.File.Open(image_path, IO.FileMode.Open, FileAccess.Read)

ReDim imgByte(fs.Length)
fs.Read(imgByte, 0, fs.Length)
fs.Close()
fs.Dispose()
fs = Nothing

Catch ex As System.Exception

End Try

If Not IsNothing(imgByte) Then
data = data.Append("&PhotoBinary=" & System.Web.HttpUtility.UrlEncode(imgByte)) 'image_path)) '

End If

'Create a byte array of the data we want to send
Dim requestBytes As Byte() = System.Text.UTF8Encoding.UTF8.GetBytes(data.ToString())

Dim oWeb As New System.Net.WebClient()

oWeb.Headers.Add("Content-Type", "application/x-www-form-urlencoded")

Try
Dim bytRetData As Byte() = oWeb.UploadData(myUri, "POST", requestBytes)
Catch ex As WebException
End Try

This code is working successfully but image is not uploading.
Please guide me if i did wrong something in code.

Regards
Dharmchand dhingra

Re: Image not uploading

Dave Kreskowiak9-Dec-09 4:39

Dave Kreskowiak

9-Dec-09 4:39

Remove all of your Try/Catch garbage since you're just eating errors and not showing them or reporting them in any way. If you're code is running into a problem, you'll never know it.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: Image not uploading

dcdhingra13-Dec-09 7:09

dcdhingra

13-Dec-09 7:09

Hi, Thanks for reply.
In this code, no any error is coming. I am able to add records successfully on server side but at server image is not displaying. I debug this code and there is no any error occurred.

Any suggestion...

Regards
Dharmchand Dhingra

Date formate in VB .net.

jeshra2798-Dec-09 21:14

8-Dec-09 21:14

Hi All,
In my sql database table, date is stored as "09/15/2009" i.e. in "MM/dd/YYYY" format.
Now i want to convert this in to "dd/MM/YYYY" i.e.15/09/2009. How to do this?

I tried the following:

Date cdate = #09/15/2009# ( retrieved from database)

Dim ddto As string
ddto = cdate.ToString("dd/MM/yyyy") --> get converted to string

Dim conDate As Date

conDate = DateTime.Parse(ddto,Globalization.CultureInfo.CreateSpecificCulture("pt-US"))

Using above i am not able to convert the date back from string format to date format using Parse function. I want finally the date format as dd/MM/YYYY instead of string format. How to do this?

Thanks.

Ashfield8-Dec-09 21:41

Ashfield

8-Dec-09 21:41

jeshra279 wrote:
In my sql database table, date is stored as "09/15/2009" i.e. in "MM/dd/YYYY" format.

No, its simply stored as a number. The display format is based on your SQL Server settings.

You do not need to convert it to another format to work with it, only when you want to display it. Then you do a tostring with the required format - just look in the help for date format, it gives loads of examples.

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

jeshra2798-Dec-09 21:48

8-Dec-09 21:48

It is stored as Date format as in my sql database table column datatype is Date.
I need to convert this to dd/MM/YYYY format but with date datatype, not in string.

Richard MacCutchan8-Dec-09 22:38

8-Dec-09 22:38

As Bob said previously a Date datatype does not have a format, it merely holds a number representing a date. Only when you need to display it on an output device does it get formatted, and this is done by converting it to a string using a standard or custom format.

jeshra2799-Dec-09 0:27

9-Dec-09 0:27

I know it has to be converted to string, but if i convert this to a string instead of date, I am not able to get correct result using the command:

cmd = New SqlCommand("SELECT [Client ID] FROM client_details WHERE [Date of Joining] <= '" + dateofj + "'GROUP BY [Client ID]", con)

The above results in incorrect data if i use this as an string, thats why i want to convert this into Date format.

pls let me know how to convert this into date format.

Richard MacCutchan9-Dec-09 0:38

9-Dec-09 0:38

jeshra279 wrote:
pls let me know how to convert this into date format.

Sorry, I don't understand what you are saying, I thought this was a Date type not a string.

Ashfield9-Dec-09 1:14

Ashfield

9-Dec-09 1:14

jeshra279 wrote:
+ dateofj +

Is where your problem lies I suspect. I expect it is in a format something like 10/10/2009 which can either be DD/MM or MM/DD. Put it into a format like '10 Oct 2009' so that SQL Server can be certain of the format.

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

David Skelly9-Dec-09 2:03

David Skelly

9-Dec-09 2:03

Or use a SqlParameter in which case it can be passed directly as a date without having to worry about format at all.

Luc Pattyn9-Dec-09 3:18

Luc Pattyn

9-Dec-09 3:18

A double advice:
- store dates and datetimes as such in the database, never store them as strings;
- pass dates and datetimes as SQL paramters, avoid passing them as strings.

If you do both, you'll never have any date formatting problems, as there no longer is any formatting going on. Formatting should be relevant only in the user interface.

Smile | :)

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

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

jeshra2799-Dec-09 3:43

9-Dec-09 3:43

As per Your 2nd point, am i passing the dates and datetimes as SQL paramters in my following select command:

cmd = New SqlCommand("SELECT [Client ID] FROM client_details WHERE [Date of Joining] = '" + dateofj + "'GROUP BY [Client ID]", con)

Luc Pattyn9-Dec-09 3:52

Luc Pattyn

9-Dec-09 3:52

No you are not. You are passing a string, and C# is implicitly calling dateofj.ToString() to perform a string concatenation afterwards; that is where the regional settings are sneaking in your code.

You need this[^] to be safe.

Smile | :)

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

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