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C# unable to get handle when multiple instances of app are open in windows 8.1

25-Apr-14 4:00

Start here[^].

Bastard Programmer from Hell Suspicious | :suss:

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

RRLCoder24-Apr-14 19:11

RRLCoder

24-Apr-14 19:11

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

Re: C# unable to get handle when multiple instances of app are open in windows 8.1

Eddy Vluggen25-Apr-14 4:01

Re: C# unable to get handle when multiple instances of app are open in windows 8.1

25-Apr-14 4:01

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:

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RRLCoder25-Apr-14 6:44

RRLCoder

25-Apr-14 6:44

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;
		}

Re: C# unable to get handle when multiple instances of app are open in windows 8.1

Eddy Vluggen27-Apr-14 9:00

Re: C# unable to get handle when multiple instances of app are open in windows 8.1

27-Apr-14 9:00

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

InvalidOperationException? Try using the full path to the application;

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[^]

RRLCoder27-Apr-14 10:49

RRLCoder

27-Apr-14 10:49

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.

Mute other applications

el_stupey24-Apr-14 15:40

el_stupey

24-Apr-14 15:40

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.

Mycroft Holmes24-Apr-14 16:17

Mycroft Holmes

24-Apr-14 16:17

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

el_stupey26-Apr-14 1:39

el_stupey

26-Apr-14 1:39

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.

Eddy Vluggen25-Apr-14 3:53

25-Apr-14 3:53

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[^]

how to edit in crystal report

el_stupey26-Apr-14 1:46

el_stupey

26-Apr-14 1:46

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.

Er Aslam Khan23-Apr-14 22:33

Er Aslam Khan

23-Apr-14 22:33

how to edit in crystal report

Chris Quinn23-Apr-14 22:59

Chris Quinn

23-Apr-14 22:59

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.
=========================================================

Keith Barrow24-Apr-14 3:09

Keith Barrow

24-Apr-14 3:09

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.[^]

thatraja24-Apr-14 21:09

thatraja

24-Apr-14 21:09

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

thatraja

Code converters | Education Needed | Improve Everything^New

Mycroft Holmes24-Apr-14 21:57

Mycroft Holmes

24-Apr-14 21:57

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

WndProc related issue in win apps c#

V.25-Apr-14 2:00

25-Apr-14 2:00

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)

Tridip Bhattacharjee23-Apr-14 20:55

23-Apr-14 20:55

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

WndProc()

here is the code a bit

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

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

Eddy Vluggen23-Apr-14 21:46

23-Apr-14 21:46

Tridip Bhattacharjee wrote:
i have developed a small win apps

Like this[^] one? Smile | :)

Did the application connect to skype? Does the demo from that website work?

Bastard Programmer from Hell Suspicious | :suss:

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

Tridip Bhattacharjee24-Apr-14 0:25

24-Apr-14 0:25

i develop my win apps following that application whose link you refer but that application is wpf based apps and working fine but my one is not working properly. if possible please download my apps from this link and run at your end to capture the problem. here is link from https://onedrive.live.com/#cid=C4A6F16F34D7540A&id=C4A6F16F34D7540A!126 just download the skypecalltest and run it and definitely notice that WndProc() function is calling repeatedly for getting message from Skype.

tbhattacharjee

Eddy Vluggen24-Apr-14 1:20

24-Apr-14 1:20

Tridip Bhattacharjee wrote:
i develop my win apps following that application whose link you refer but that application is wpf based apps and working fine but my one is not working
properly

A Windows Forms application? Try running it as an admin Smile | :)

Tridip Bhattacharjee wrote:
if possible please download my apps

I'm not going to download a complete project, especially not one that hooks into my Skype. You might want to add in some code that logs *each* WM_BROADCAST and each WM_COPYDATA going trough the WndProc; see if they get called.

Bastard Programmer from Hell Suspicious | :suss:

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

Tridip Bhattacharjee24-Apr-14 1:43

24-Apr-14 1:43

you asked me to log WM_BROADCAST and each WM_COPYDATA that is the main problem because when i run my apps then controls only come to this if block only once

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

so i think if try to log WM_BROADCAST and WM_COPYDATA then only once it will be logged. any better idea?

tbhattacharjee

Eddy Vluggen24-Apr-14 6:22

24-Apr-14 6:22

Does it stop painting the form after that message is received?

if (handled) DefWndProc(ref m); else base.WndProc(ref m);

Why is the DefWndProc there?

Bastard Programmer from Hell Suspicious | :suss:

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

Tridip Bhattacharjee24-Apr-14 20:49