Problem I can't get past. - C# Discussion Boards

How can I access the App's tab in the task Manager

26-Jun-07 16:21

Process.Start is the way to do that. The assembly stuff works for .NET stuff only.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

jeguzmanv26-Jun-07 14:59

jeguzmanv

26-Jun-07 14:59

Hello, How can I access the Application tab in the task
manager, I’m not talking about the process' name because an App Can have associated a
process with different name, I need to know that because sometimes happens that when you
exit an app. The process still remains in the process tab, so if it happens I
can ask for the name of the App and kill the process.
thank you in advance!!!

Jose Guzman

Re: How can I access the App's tab in the task Manager

Christian Graus26-Jun-07 15:45

Re: How can I access the App's tab in the task Manager

26-Jun-07 15:45

You can't. Your best bet is to fix your app so that it closes properly. Your app can close it's own process, if it does this, it's not running, so how can it close itself again, and why would it use an external method to look up it's own process ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

jeguzmanv27-Jun-07 5:03

jeguzmanv

27-Jun-07 5:03

Thank you for your answer, here I’m going to explain you what my problem is about:
My Application runs several installers (the installers are for example mysql, odbcConnector) and each one waits for the previous installer to finish to go on to the next one, they all request the windows installer(msiexec.exe) and that’s my condition for waiting(process.WaitForExit()). In a normal situation (context) when I finish the installation or cancel an installer, it closes the process msiexec.exe however very often happens that it doesn´t close the process msieexec.exe that´s why my Application doesn´t continue to the next installer. Perhaps you´re wondering why I don’t use the waitforexit directly for the Installer and that´s because it doesn´t wait.
Thank you very much for your help.

Jose Guzmán.

Re: How can I access the App's tab in the task Manager

jeguzmanv27-Jun-07 5:52

jeguzmanv

27-Jun-07 5:52

Hello it´s me again, I just realized that when a Installer is runing there is two windows installer instances, the first one is Current user instance and the second System´s, so I´m gonna ask for the current´s.
Thank you

Jose Guzmán

Problem I can't get past.

Cory Borrow26-Jun-07 13:54

Cory Borrow

26-Jun-07 13:54

I have an application it is tabbed based and holds a texteditor in each tab (The ICSharpCode TextEditorControl). I can open as many tabs as I want but when I switch bewteen 2 or three tabs I get this error.

I'm am getting "Object reference not set to an instance of an object" result back. Problay somthing small I am missing somewhere, but I can't see where.

Below is the code for when a tab switches.

void TabControl1SelectedIndexChanged(object sender, EventArgs e)<br />
		{<br />
			if(tabControl1.TabPages.Count > 0 && !tabControl1.SelectedTab.Disposing) {<br />
				openFile = tabControl1.SelectedTab.ToolTipText;<br />
				<br />
				if(lengthSet == false) {<br />
					if(oldLength != tabControl1.SelectedTab.Controls["textEditorControl1"].Text.Length)<br />
						oldLength = tabControl1.SelectedTab.Controls["textEditorControl1"].Text.Length;<br />
						<br />
					if((bool)tabControl1.SelectedTab.Tag == true) {<br />
						saveToolStripMenuItem.Enabled = false;<br />
						toolStripButton3.Enabled = false;<br />
					}<br />
					else {<br />
						saveToolStripMenuItem.Enabled = true;<br />
						toolStripButton3.Enabled = true;<br />
					}<br />
				}<br />
			}<br />
			lengthSet = false;<br />
		}

The Line
if((bool)tabControl.SelectedTab.Tag == true)
returns the error

If I add

<br />
TextEditorControl editor = (TextEditorControl)tabControl1.SelectedTab.Controls["textEditorControl1"];<br />

and replace the line with the error with
if(editor.IsReadOnly)
It still returns the same thing.

Ed.Poore26-Jun-07 13:59

Ed.Poore

26-Jun-07 13:59

Any chance that the SelectedTab is null when this exception is thrown? Check it with the debugger.

My Blog

Cory Borrow26-Jun-07 14:49

Cory Borrow

26-Jun-07 14:49

It shows that it selected has a TabPage I can view all the info for that tabpage and everything though the debugger.

It's weird that it stops and that line though, it skips the rest of the places where I have used tabControl1.SelectedTab.

Christian Graus26-Jun-07 15:02

26-Jun-07 15:02

SelectedTab must be null, unless tabControl is. That's the only explanation for the error.

Assuming the error is not thrown by the cast, and the Tag might be null ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Cory Borrow26-Jun-07 15:54

Cory Borrow

26-Jun-07 15:54

Thanks, I checked out the debugging info and saw that Tag was not even showing up in it, so I created another class to extend the TabPage and added an IsFileReadOnly variable and it seems to work fine now.

Christian Graus26-Jun-07 16:22

C#, IE, C++ & BHO's... getting a C# Explorer Toolbar to talk to a C++ BHO

26-Jun-07 16:22

Great - that exception always means something is null, I didn't realise it would be thrown by the cast attempt, that occured to me at the last minute. I'd always use the Convert. or a TryParse ( bool.TryParse ? ) to do conversions, and check for null first.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

BenAnderson26-Jun-07 11:03

BenAnderson

26-Jun-07 11:03

Hello,
I'm a bit new at in-depth IE programming, and am having a bit of trouble with a couple of IE browser extensions (getting them to talk to each other).

The first one is a C++ Browser Helper Object (BHO).

I have a class (MyClass) that has a method called "ReferenceMe" that calls the browser's "PutProperty" method to save a reference to the BHO instance in IE.

Theoretically other COM object should be able to call IE's "GetProperty" method to retrieve this reference and use it to invoke methods in the BHO.

I also have another method in the BHO called "toggleActiveState" that just sets a boolean flag. That's the method I want to invoke from outside of the BHO.

Then I have a C# Explorer Toolbar object. I'm trying to call the BHO's "toggleActiveState" method from the C# code.

The problem I'm having is that I can't figure out how to invoke that "toggleActiveState" method in the C++ BHO from the C# code.

When I try to call the GetMethod function call in C# to retrieve the method's reference, it returns NULL.

Below are snippets of my code...

Here's the C++ code...

<br />
// This seems to work fine... it saves a reference to the BHO in an IE Property for later retrieval.<br />
HRESULT MyClass::ReferenceMe()<br />
{<br />
	BSTR bstrThisKey = SysAllocString(L"MyClass_IDisp");<br />
	VARIANT vThis;<br />
	HRESULT hr = S_OK;<br />
<br />
	if (!m_spWebBrowser)<br />
		hr = S_FALSE;<br />
	else<br />
	{<br />
		// Save this to a variant that will be referenced in IE Session<br />
		VariantInit(&vThis);<br />
		vThis.vt = VT_DISPATCH;<br />
		vThis.pdispVal = static_cast<IDispatch*>(this);<br />
<br />
		// Add our this pointer to IE session by adding a named property<br />
		if (FAILED( m_spWebBrowser->PutProperty(bstrThisKey, vThis) ))<br />
		{<br />
			hr = S_FALSE;<br />
		}<br />
	}<br />
	<br />
	VariantClear(&vThis);<br />
	SysFreeString(bstrThisKey);<br />
    return hr;<br />
<br />
}<br />
<br />
// This is the method that I want to call from the C# code<br />
// It's declared in the Public portion of the class in the .h file.<br />
void STDMETHODCALLTYPE MyClass::toggleActiveState()<br />
{<br />
	m_bActive = !m_bActive;<br />
}<br />
<br />

And here's my C# code...

<br />
private void toggleBHO()<br />
{<br />
	Object pvarPBHO = null;<br />
	// Get the property from IE that was put there by the C++ code's call to "PutProperty"<br />
	// This does seem to return a COM object, which I'm assuming is my BHO reference.<br />
	pvarPBHO = Explorer.GetProperty("MyClass_IDisp");<br />
	if (pvarPBHO != null)<br />
	{			<br />
		MessageBox.Show("About to call GetType.");<br />
		// Get the object's type.  This seems to work fine.<br />
		Type typExternal = pvarPBHO.GetType();<br />
		if (typExternal != null)<br />
		{                    <br />
			// Now try to retrieve a reference ot the "toggleActiveState" method within the C++ code<br />
			MethodInfo mthInv = null;<br />
			MessageBox.Show("About to call GetMethod.");<br />
			<br />
			// AT THIS POINT THE GetMethod FUNCTION RETURNS NULL...<br />
			<br />
			// I'm not sure if I'm not calling this right, or if my prototype isn't quite right<br />
			// to allow public access to the method, or what.<br />
			mthInv = typExternal.GetMethod("toggleActiveState");<br />
			if (mthInv != null)<br />
				mthInv.Invoke(pvarPBHO, null);<br />
			else<br />
				MessageBox.Show("GetMethod returned NULL.");<br />
		}<br />
		else<br />
			MessageBox.Show("GetType returned NULL.");<br />
	}<br />
	else<br />
		MessageBox.Show("GetProperty returned NULL.");<br />
}<br />

Perhaps my whole approach to this is off. Is there a better way to get these two COM objects to talk to each other?

Thanks very much!

ftp FtpWebRespose.GetRespone() Exception

Mostafa Siraj26-Jun-07 8:43

Mostafa Siraj

26-Jun-07 8:43

I'm using local ftp -using windows XP- I can access it through my browser ftp://localhost/ but when I'm trying to access it through my C# program I had an exception and here is my code

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://localhost/");

request.Method = WebRequestMethods.Ftp.UploadFile;

//request.Credentials = new NetworkCredential("anonymous",
// "janeDoe@contoso.com");
request.Credentials = new NetworkCredential(username, password);

StreamReader sourceStream = new StreamReader(filePath);
byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
sourceStream.Close();
request.ContentLength = fileContents.Length;

Stream requestStream = request.GetRequestStream();
requestStream.Write(fileContents, 0, fileContents.Length);
requestStream.Close();

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

I get an "Invalid URI" at request.GetResponse() so can anyone figure what am doing wrong

thanks in advance

"Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure" -Nelson Mandela-

UDP Error

ramdil26-Jun-07 6:54

26-Jun-07 6:54

Hi all.
I am new to socket programming .i have two application created on .net 2 version and this two application is listening to single port .
First application sends the data and second application recieves the data.
Now i am getting following error
Only one usage of each socket address (protocol/network address/port)
is normally permitted

Can any pls help

Thanks in Advance

Regards
DilipRam

Dave Kreskowiak26-Jun-07 7:07

Dave Kreskowiak

26-Jun-07 7:07

One of your applications, or some other app, is already using whatever port you picked. You didn't say which app is throwing the exception or what is was doing at the time of the error.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

ramdil26-Jun-07 7:50

26-Jun-07 7:50

Sorry for not mentioning it clearly.My first application opens a connection at the formload event and then access the send message method which is written in the class file.My second application also opens a connection in its form load event and access recieve method which is written in the class file.Both application are accessing same port.when i load the first application , the first application shows the error.
Hope i am clear this time.

Regards
DilipRam

Dave Kreskowiak26-Jun-07 9:11

Dave Kreskowiak

26-Jun-07 9:11

You've got both application opening the same port. That won't work.

The first application will launch and open the port. The second will fail every time because you can't have two applications listening on the same port.

Now, if you launch the first application and it fails, then some other application already has the port open, or, the port was never closed and released properly on the first run of your app.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

ramdil27-Jun-07 3:20

27-Jun-07 3:20

Thanks for the reply.But then if i want a application which should send some data and another application should recieve that same data, and after recieving data , the recieved application should send the data back to send application, then how can i do it.Should i use different ports.If i use different ports then how can each application recieve the data.Can you pls explain it.

Regards
DilipRam

Dave Kreskowiak27-Jun-07 11:45

Dave Kreskowiak

27-Jun-07 11:45

They talk back and forth on the same port. The server listens on a port, the client connects to the server on that port, then, in a simple example, they both use NetworkStreams to talk back and forth to each other, just like reading/writing a text file.

If you want examples, Google for "C# Chat" and you'll come up with tons of them.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

ramdil29-Jun-07 2:52