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I have a standard ComboBox. As soon as the user "touches" (with the mouse or the keyboard) the ComboBox, I would like to enforce that SelectedValue is never again -1. The normal case is that if the user doesn't select an item, SelectedValue becomes -1. However, if the user doesn't make a selection, I would like the first item to be selected. How can I accomplish this?

The easiest way is to change the DropDownStyle to DropDownList - then once a value is selected it can never be deselected.
If you combine that with handling the DropDown event and setting the SelectedIndex to zero in that, it should do what you want.

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

DropDownStyle is already set to DropDownList. If the user doesn't select any of the items (he/she clicks outside the ComboBox after he/she has "touched" ComboBox) then I don't get ComboBox_SelectedIndexChanged or ComboBox_SelectionChangeCommitted events. It seems those events are only fired when a selection is made inside the ComboBox.

That's why I said "If you combine that with handling the DropDown event..."

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

Ok, I understand:

C#

private void comboBox_DropDown(object sender, EventArgs e)
{
    if (((ComboBox)sender).SelectedIndex < 0)
    {
        ((ComboBox)sender).SelectedIndex = 0;
    }
}

Very good idea, that works great! Thanks!

That's the event! Laugh | :laugh:

You're welcome!

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

i have created a dll file that include user control with panel on it ,when i add this dll to my tool box i can only have access to user control and not the panel ! while i need to drag n drop a picture box into it ! plz help me on this .
i just want to do it on design time not programitically!

Start here[^].

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

I have been trying to start multiple instances of iexplore and other
apps then get the handle so i can reposition it and other actions.
It works great in Windows 7 using myProcess.Id to find the process and retrieve the MainWindowHandle. It also works in Windows 8.1 if there is
only 1 instance of the application running.
The Problem: When i get more than one instance of the app open in W8.1 I can not find the handle. I can get the process id but can't get the handle even by looping through all processes and looking for the handle.
Help

RRLCoder wrote:
I can get the process id but can't get the handle

Can you post a SMALL examle that reproduces this problem?

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

This is a bit long but shows most of what i've tried

//typical prcess start
	string ProcToStart = "iexplore";
	int saveProcId;
	
	Process myProcess = new Process();
	myProcess.StartInfo.FileName = TargetFile;
	myProcess.StartInfo.Arguments = TargetArguments;
    	myProcess.StartInfo.UseShellExecute = true;  //seems to make no difference
	myProcess.Start();
	saveProcId = myProcess.Id;
		
1-the simple approach, just trying to access myProcess.MainWindowHandle gets 0 even after a 10 min sleep

2--here is one method looping through all processes
I also tried this wraped in:  while (proc.MainWindowHandle == IntPtr.Zero) (ran forever & didnt find a hit)....
    foreach (Process proc in Process.GetProcesses())
    {
        if (proc.Id == saveProcId)
        { 
	    Console.WriteLine(" PID: " + proc.Id + "    Handle:  " + proc.MainWindowHandle);
	}
    }

3--Here is another attempt using ....GetProcessById
		try
		{
			ChosenProc = Process.GetProcessById(ProcId);
			Console.WriteLine("Your Process Info: " );
			Console.WriteLine("  Id: " + ChosenProc.Id
				+ "  Handle: " + ChosenProc.Handle
				+ "  MainWinHndl: " + ChosenProc.MainWindowHandle
				+ "  Name: " + ChosenProc.ProcessName);
			return true;
		}
		catch
		{
			ChosenProc = null;
			Console.WriteLine("Incorrect entry.");
			return false;
		}

RRLCoder wrote:
This is a bit long but shows most of what i've tried

InvalidOperationException? Try using the full path to the application;

C#

Process myProcess = new Process();
myProcess.StartInfo.FileName = @"C:\Program Files\Internet Explorer\iexplore.exe";
myProcess.StartInfo.Arguments = @"http://www.codeproject.com";
myProcess.Start();
Console.WriteLine(myProcess.Id);
Console.ReadLine();

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Thanks...
I just tried it both ways (fully qualified and just the iexplore) followed by:
Console.WriteLine("IE Instance started... PID= " + myProc.Id + myProc.MainWindowHandle);
I get an unhandled exception on the myProcess.MainWindowHandle no matter how much of a sleep or if i loop looking for the process id. Again, it works find if there is only 1 instance of the target app (iexplor in this case) open.

I run an indoor sports facility.
Our receptionist uses some media player for background music in our foyer.

What I need is a way to mute that media player, to play my own .wav file to remind players to be ready 10 minutes before events start, (triggered by system time) then resume the background media player.
If that makes sense?

My application is in C# and uses AXVLC.
Im also considering making it a Service instead, so the receptionist doesnt close it.

Uhm what is your question, does it make sense, yes. There aeems to be plenty of support for this process on Google.

I would not make it a service, what happens if you want to interrupt the announcement or make an adhoc announcement. You actually need a PA system and should probably look around for a package before attempting to build your own (this assumes you are into running the sports centre and are not a developer).

Never underestimate the power of human stupidity
RAH

I've been a hobbyist developer for much longer than I've been working at the centre. But theyve just made me a manager, so now looking at making some cool new toys. We've got a PA system, but I want to make things as automated as possible as Im getting busy doing other things.

el_stupey wrote:
Im also considering making it a Service instead, so the receptionist doesnt close it.

That's not what a service is for; and yes, the user can close services. Using services also introduces a new problem - they usually run under a system-account, and should not be messing with the users' desk.

Simplest solution; get a list of MP3's to play. Play them yourself (from code), then it becomes quite easy to interrupt the song at a predefined time and to play "something else".

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Maybe a service isnt what I need. Was just a thought.

Thanks for the suggestion, I might try that out.

Also found another answer here. Only problem with that is it claims win7 and later which means finally upgrade from vista.

how to edit in crystal report

Reports are effectively read-only views of your data and should not be used for editing the data

=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================

Edit what exactly? The criteria?
Can you edit your question please, it isn't clear.

PB 369,783 wrote:
I just find him very unlikeable, and I think the way he looks like a prettier version of his Mum is very disturbing.[^]

No, you can't. If you want to display dynamic data, use parameter, query, etc.,

thatraja

Code converters | Education Needed | Improve Everything^New

IIRC you can add comments to a report, not the same as editing which is not possible.

I might be completely wrong as I have not used that pile of crap for over a decade. One of the worst apps even inflicted on the development community.

Never underestimate the power of human stupidity
RAH

What do you mean exactly ?
Usually you work from a template and assign data to it, either by passing parameters so the report generates itself or by passing a datasource.

So do you want to change the template or the generated report itself.
In case of the former, to do it properly you'll need the crystal reports editor application (VS is limited).
In case of the latter, please define better what you want to achieve, because that's not entirely the purpose of Crystal Reports.

V.

(MQOTD rules and previous solutions)

i have developed a small win apps which is suppose to capture skype conversation. my main concern is that i have define the

C#

WndProc()

here is the code a bit

C#

protected override void WndProc(ref Message m)
{
    Boolean handled = false;
    if (m.Msg == NativeCalls.APIAttach && (uint) m.LParam == NativeCalls.SKYPECONTROLAPI_ATTACH_SUCCESS)
    {
        // Get the current handle to the Skype window
        NativeCalls.HWND_BROADCAST = m.WParam;
        handled = true;
        m.Result = new IntPtr(1);
    }

    // Skype sends our program messages using WM_COPYDATA. the data is in lParam
    if (m.Msg == NativeCalls.WM_COPYDATA && m.WParam == NativeCalls.HWND_BROADCAST)
    {
        COPYDATASTRUCT data = (COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam, typeof(COPYDATASTRUCT));
        StatusTextBox.Items.Add(data.lpData + Environment.NewLine);

        // Check for connection
        //if (data.lpData.IndexOf("CONNSTATUS ONLINE") > -1)
        // ConnectButton.IsEnabled = false;

        // Check for calls
        IsCallInProgress(data.lpData);
        handled = true;
        m.Result = new IntPtr(1);
    }

    m.Result = IntPtr.Zero;
    if (handled) DefWndProc(ref m); else base.WndProc(ref m);
    //base.WndProc(ref m);
}

but controls is not coming in this

C#

if (m.Msg == NativeCalls.WM_COPYDATA && m.WParam == NativeCalls.HWND_BROADCAST)

block that is main problem.

SQL

here i attach the link of my win application and that is https://onedrive.live.com/#cid=C4A6F16F34D7540A&id=C4A6F16F34D7540A!126 just download the skypecalltest and run it.

before run my apps just login to skype and then run my apps where you put a phone no and click on call button then you can see the controls is not coming repeatedly to the second if block.

so what i need to change in my code as a result control will come to second if block repeatedly .

in the same link there is another same kind of apps which is based on wpf and that is working where wndproc is calling repeatedly. if possible check that code too and guide me what i am missing or making mistake. thanks

tbhattacharjee