C / C++ / MFC

valikac14-Aug-03 6:34

valikac

14-Aug-03 6:34

What do you mean hide then? Do you mean disable an item?

Kuphryn

orcun colak14-Aug-03 6:42

orcun colak

14-Aug-03 6:42

I mean something like this:
Assume there are 3 items in the tree
Item1
Item2
Item3

I would like to hide item2 and have a tree like this
Item1
Item3

Then sometime later I would like to bring the tree to its initial state.
I was wondering if is this possible or do I have to delete the items and then insert them back to simulate a hide/show item effect.
Thanks

Orcun Colak

Neville Franks14-Aug-03 10:03

Neville Franks

14-Aug-03 10:03

orcun colak wrote:
I was wondering if is this possible or do I have to delete the items and then insert them back to simulate a hide/show item effect.

That is the only way I am aware of with the MS tree ctrl.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Status bars and Property Sheets

J. Dunlap15-Aug-03 18:42

J. Dunlap

15-Aug-03 18:42

It should be possible, but it isn't yet. I'm the leader of a new project to redo the Windows controls from scratch. It started out as a project on CP[^], but it will soon be moving off of CP, to its own site, and will be called the Fluid UI Toolkit. We are wanting to make a new set of controls from scratch, and avoid the limitations of the current Windows controls.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

VirtualQueryEx

Blake Miller14-Aug-03 5:57

Blake Miller

14-Aug-03 5:57

Background:
This function allegedly allows one process to collect information about the memory usage of other processes.

The (only) Microsoft sample code using this API seems to be a sample debugger that spawns a process under debug and then uses the API.

In true MS fashion, the documentation talks about about using OpenProcess to get a handle to another process and then using that handle in the call to VirtualQueryEx. There is no mention that you must be DEBUGGING the other application.

In some tests cases so far, I get access violation trying to OpenProcess, but assuming that succeeds, the error code is 'invalid parameter' on return from VirtualQueryEx. I know the other parameters are valid, so I am assuming it is a form of access denied.

The Problem:
Unless you are on Windows XP or later. You can not seem to attach to a process to debug and then detach without stopping the process which was being debugged. Not good for our application.

The Question:
Has anyone got this to work to spy on other process memory without 'debugging' the other process?

Re: VirtualQueryEx

Alexander ^M.,16-Aug-03 14:54

Alexander ^M.,

16-Aug-03 14:54

try it like this:

HANDLE hProcess;
MEMORY_BASIC_INFORMATION mem;
hProcess = OpenProcess( PROCESS_VM_OPERATION, FALSE, id );

VirtualQueryEx( hProcess, 0x00400000, &mem, 4 * 1024 );

this has to work... debugging is not nesassary

Don't try it, just do it! Wink | ;-)

Re: VirtualQueryEx

Blake Miller18-Aug-03 10:42

Blake Miller

18-Aug-03 10:42

Two things so far.

1. I do not think this is correct anyway:
VirtualQueryEx( hProcess, 0x00400000, &mem, 4 * 1024 );

Should probably be:
VirtualQueryEx( hProcess, 0x00400000, &mem, sizeof(MEMORY_BASIC_INFORMATION) );
which now works fine.

2. Why can I only query virtual memory usage from 0x00000000 to 0x7FFE0000 ?
Reading from 0x7FFF0000 causes 'invalid parameter' to be returned from GetLastError().
I REALLY want to make a map of memory usage between 0x80000000 to 0xFFFFFFFF.
Why are these memory ranges out of bounds? That is the range where the memory mapped files and shared memory between applications are usually located, and it is still initially aquired by a process using the VirtualAlloc calls.

DodgyG14-Aug-03 5:40

DodgyG

14-Aug-03 5:40

Is it possible to append a status bar to to a property sheet?

BOOL CMyPropertySheet::CreateStatusBar()<br />
{<br />
    static UINT nIndicators[] = <br />
	{<br />
        ID_SEPARATOR,<br />
        IDS_TIME/*<br />
        ID_INDICATOR_CAPS,<br />
        ID_INDICATOR_NUM*/<br />
    };<br />
<br />
    if (!m_bar.Create (this))<br />
        return FALSE;<br />
<br />
    m_bar.SetIndicators (nIndicators, 2);<br />
    return TRUE;<br />
}

The above function is called from the OnCreate() function of my PropertySheet but it fails to appear. Any ideas?

Sending messages with Server/Client

Jay Hova14-Aug-03 5:22

Jay Hova

14-Aug-03 5:22

Hi All,
I'm new to programming, so i have been trying to read and go to a few classes.
I have been reading the tutorials on Server/Clients and am still a little confused.

Right now i have a dialog that has a couple of check boxes on it, and I want to send the information of whether the boxes are checked or not to the server side . The message is just a string that looks like this : 2000 or 2001

I know that the two connect, but I can not get the message to be sent to the server. I am using the command:

send (socket, buf,strlen(buf),0)

where socket is instantiated in another dialog class that i use to connect to the server. How do I use the same socket that is already connected to the server to send this message. It won't compile unless i instantiate another socket in the dialog class with the check boxes.

Many thanks in advance.

Re: Sending messages with Server/Client

valikac14-Aug-03 6:38

valikac

14-Aug-03 6:38

Under winsock, the program calls Win32 API to access the socket. If you wanted to send data on one object and receive data in another object, then one solution is to pass the socket.

Kuphryn

Re: Sending messages with Server/Client

Jay Hova14-Aug-03 6:54

Jay Hova

14-Aug-03 6:54

I'm sorry but i do not understand what to do.

Once I have the client and the server connected, how do i send the message to the server? It doesn't seem to send the data to the server. Is there something I have to pass between the two cpp files, or can i just connect and then instantiate a SOCKET object and send it to that?

Can someone possible give me some sample code...i looked at the tutorials on this site but i still can't get it to work.

Thanks in advance.

DLL loading multiple times

BAmity14-Aug-03 5:02

BAmity

14-Aug-03 5:02

I have a few questions:
1. Can anyone tell me why a DLL may be loaded more than once by a program?
2. Can anyone suggest a good resource for learning more about how DLLs are loaded/unloaded by the Windows operating system?
3. Does anyone know what the clbcatq.dll contains?
Thanks!

geo_m14-Aug-03 5:18

geo_m

14-Aug-03 5:18

1. as far as I know, you may 'load' it multiple times, but it will just increase some internal counter, in reality, you'll get just one dll in memory.

2. LoadLibrary is a good starter in MSDN, the Remarks section contains valuable hints and references.

3. sorry, no idea

David Crow14-Aug-03 5:32

David Crow

14-Aug-03 5:32

Amity Binkert wrote:
1. Can anyone tell me why a DLL may be loaded more than once by a program?

How are you verifying this? If the DLL is implicitly loaded, it happens once. If the DLL is explicitly loaded, it is still only loaded once, but the reference count is incremented with each successive call to LoadLibrary().

Amity Binkert wrote:
3. Does anyone know what the clbcatq.dll contains?

Are you sure the file isn't ~clbcatq.dll? Its presence indictaes that COM+ was not setup properly.

Andrew Walker14-Aug-03 5:32

Andrew Walker

14-Aug-03 5:32

3. Run dependancy walker on the DLL. From having a look at that, and checking the product name ('COM Services') [edit] i guess [/edit] that it has to do with fundamental COM stuff.

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

Steve S14-Aug-03 5:35

Steve S

14-Aug-03 5:35

3. It's part of the COM services (aka COM+) stuff.
Think it's part of the COM+ Catalog stuff (but not the admin interface)

Steve S

Ambiguous Overload.

⁷³Zeppelin14-Aug-03 4:30

⁷³Zeppelin

14-Aug-03 4:30

In a bit of a quandry here...

I have two constructors for a class:

CMatrix(unsigned int uiRows, unsigned int uiColumns);
CMatrix(unsigned int uiSize, bool bCreateIdentity);

Unfortunately when I call the constructor in the code:

CMatrix* aMatrix;
aMatrix = NULL;
aMatrix = new CMatrix(2,2);

The VS 6.0 compiler informs me:

<br />
error C2668: 'CMatrix::CMatrix' : ambiguous call to overloaded function<br />

Which, I suppose, leaves me with three solutions:

1.) Use BOOL in place of bool which
I wanted to avoid

2.) Use int instead of unsigned int which
would require changing alot of already existing code and which
is really not what I want to do (I prefer unsigned int)

3.) Add a 3rd dummy parameter to one of the constructors, but this
seems like a desperate hack Suspicious | :suss:

Has anyone run into this before and come up with a creative solution
they would be willing to share?

David Crow14-Aug-03 4:45

David Crow

14-Aug-03 4:45

Does aMatrix = new CMatrix(2, 2U); help?

⁷³Zeppelin14-Aug-03 4:49

⁷³Zeppelin

14-Aug-03 4:49

Ah, yes! Of course! Roll eyes | :rolleyes:

That's perfect. Thanks.

⁷³Zeppelin14-Aug-03 5:08

⁷³Zeppelin

14-Aug-03 5:08

Actually, your use of the format specifier gave me
an idea. I tried this and it works also:

aMatrix = new CMatrix(2, static_cast<unsigned int>(2));

Unless this is safer, I prefer your solution - much shorter
and to the point.

Thanks again.