C / C++ / MFC

11-Aug-12 17:53

Hi,

I have a richedit display which I populate whitin the CDialig::OnInitDialog
via a streamin fuction

The Dialog is createded on the Heap while the richedit is a member of the of the CDialog Class

In the Initdialog I :: Create The Richedit then subclass the richedit via

DDX_CONTROL

Calculate the size I want for the richedit

DO a MoveWindow for the size I want

the Richedit is displayed with the text I want but then instantously an exception
occurs

I commneted out all my messages from the BEGIN_MESSAGE_MAP figuring I wasn't processing one of the messages correctly

but the exception still occurs

When I run the code via Visual studio and have Break point on the BEGIN_MESSAGE_MAP

for the CDialog the exception usally occurs after 9th time the BEGIN_MESSAGE_MAP is

executed

Any help would appreciated

Richard MacCutchan11-Aug-12 21:44

11-Aug-12 21:44

ForNow wrote:
an exception occurs

ForNow wrote:
but the exception still occurs

ForNow wrote:
the exception usally occurs after

And the exception details are what?

One of these days I'm going to think of a really clever signature.

ForNow12-Aug-12 3:07

12-Aug-12 3:07

The Following is the text from Dialog Box

Unhandled exception at 0x5e7fa640 in HERC_CMD.exe: 0xC0000005: Access violation reading location 0x00000118.

Thanks

Richard MacCutchan12-Aug-12 4:01

12-Aug-12 4:01

That merely shows that you have an access violation somewhere in your program. I'm afraid the above information is not nearly enough for anyone else to guess what might be happening. You need to use your debugger to isolate the section of code where it occurs.

One of these days I'm going to think of a really clever signature.

ForNow12-Aug-12 12:47

12-Aug-12 12:47

Hi,

I tracked my exception problem to OUT OF MEMORY as I hadn't checked the return code from my CDialog::Create

Since I am doing Interprocess communication with a console program I allocate most of my objects on the Heap

So my question(s) now are

1) How can I tell how much heap storage is allocated to my app
2) Is there anyway from the Visual Studio debugger to tell how much heap I have used

The only information I have is from task manager in the memory coulmn (private working set) says I am using 2,540 for my process

My laptop has 3.00 gb I think I could go up to 4 gb though I don't think adding more memory is the root of the problem

thanks

Bram van Kampen12-Aug-12 14:45

Bram van Kampen

12-Aug-12 14:45

Hi,

ForNow wrote:
1) How can I tell how much heap storage is allocated to my app

1) Derrive All classes from a common abstract class. 'MyCommonClass'
2) Declare a Static property: 'QWORD MyCommonClass::m_qw_AllocMem=0;'
3) Declare a Pure Virtual Function 'DWORD MyCommonClass::_GetSize()=0'
4) Write a Contructor:'MyCommonClass::MyCommonClass(){m_qw_AllocMem+=_GetSize();}'
5) Write a Destructor:'MyCommonClass::~MyCommonClass(){m_qw_AllocMem-=_GetSize();}'

ForNow wrote:
2) Is there anyway from the Visual Studio debugger to tell how much heap I have
used

Well I'm using C++ 5.00, and, No, there is none there.

ForNow wrote:
The only information I have is from task manager in the memory coulmn (private
working set) says I am using 2,540 for my process

My laptop has
3.00 gb I think I could go up to 4 gb though I don't think adding more memory is
the root of the problem

Well I dont'know what you are trying to achieve. I take it that you've only one thread. Also, you will get the same message if you exhaust the stack. This can happen if you have an Not Terminating recursion. (A recursion is a routine calling itself)

A 'RichEdit' is not an easy control to set up. It relies on COM Objects to do its bidding. I have always avoided this control for that reason. COM objects, by their nature are linked at Runtime, the details of the actual DLL and Function to be called extracted from the Registry. That latter process is notoriouisly slow, and consumes large amounts of memory.

Also, some libaries simply report 'Out Of Memory' when any other error occurs, which the author did not document further.

Hope this was usefull,

Bram van Kampen Smile | :)

Richard Andrew x6412-Aug-12 15:12

Richard Andrew x64

12-Aug-12 15:12

What do you put in the body of _GetSize()?

The difficult we do right away...
...the impossible takes slightly longer.

Bram van Kampen13-Aug-12 11:24

Bram van Kampen

13-Aug-12 11:24

Hi,

Richard Andrew x64 wrote:
What do you put in the body of _GetSize()?

In the Base Class we have _GetSize()=0; (Pure Virtual Function)

In each of the Derrived classes:

C++

int MyClass::_GetSize(){return sizeof(*this);}

Because the function is declared Pure Virtual in the base class, the compiler will insist that an implementation of a derrived class includes the function declaration and definition for _GetSize() (i.e.: One cannot 'forget' to include it.)
Regards

Bram.

Bram van Kampen

Richard Andrew x6413-Aug-12 12:10

Richard Andrew x64

13-Aug-12 12:10

Brilliant!

The difficult we do right away...
...the impossible takes slightly longer.

Richard MacCutchan12-Aug-12 21:44

12-Aug-12 21:44

1. See the comments in MSDN on operator new[^].
2. Not that I am aware of, as I have never run into this problem.

It may well be that you are going in the wrong direction with this issue. You need to go back to your application and try to determine why you are running out of memory, rather than trying to find out how much may be available.

One of these days I'm going to think of a really clever signature.

ForNow13-Aug-12 2:56

13-Aug-12 2:56

Hi,

I have 4 CWinThread objects which are wrappers for 4 CAsyncObjects I commented out the creation of these objects and still I get an out of memory when trying to do the create for the modeless dialog box

I am going to start post to see if there are any plug-in to the Visual Studio debugger which track Heap storage

Thanks

Richard MacCutchan13-Aug-12 3:02

13-Aug-12 3:02

You have changed your explanation of the problem from your original post; where did this modeless dialog come into the equation? As I said above, you really need to spend some time going through your code to find out where (and why) you are using all this storage.

One of these days I'm going to think of a really clever signature.

ForNow13-Aug-12 7:01

13-Aug-12 7:01

Sorry I was getting exceptions and wasn't sure truth is I didn't check the return codes

I just did some reading in a Book MFC internals and there is a section there about memory leaks using the CMemoryState functions

I am going track the heap memory I use

Thanks

VINSON_13-Aug-12 20:54

VINSON_

13-Aug-12 20:54

C++

OnSize(UINT nType, int cx, int cy)
{
    IsWindow(xxx.GetSafeHwnd())
    {
         //move your window
    }
}

Richard MacCutchan13-Aug-12 21:26

CSplitterWnd::GetPane asserts with CFormView pane

13-Aug-12 21:26

What does this mean and why have you posted it to me?

One of these days I'm going to think of a really clever signature.

Vaclav_11-Aug-12 5:14

Vaclav_

11-Aug-12 5:14

I have a working static splitter frame and need to retrieve pane based on CFormView.
I am getting assertion in GetPane MFC (4.0 / VC 6.0) function , and only on this type of splitter pane.
Plain CView works fine.
I did search on similar problems and it looks like the CFormView is the problem.

Any suggestion how to fix this?

Please no “ upgrade to xxxx”, not an option.

CWnd* CSplitterWnd::GetPane(int row, int col) const
{
ASSERT_VALID(this);
CWnd* pView = GetDlgItem(IdFromRowCol(row, col));
ASSERT(pView != NULL); // panes can be a CWnd, but are usually CViews
return pView;
}

Your help is as allways appreciated.
Cheers Vaclav

Re: CSplitterWnd::GetPane asserts with CFormView pane

Stephen Hewitt11-Aug-12 7:28

Stephen Hewitt

11-Aug-12 7:28

Which asset?

Steve

how to reference a c# DLL from a c++ DLL

gs_murphy@ntlworld.com10-Aug-12 2:55

gs_murphy@ntlworld.com

10-Aug-12 2:55

Hello

This is my first post, so excuse me if its in the wrong place, I need to reference a public class within a c# dll, Let me set the scene,

lets call the c# dll 2 and the c++ DLL 1, Within dll 1 i have an int main(void) and I have referenced DLL 2 in the project, I have referenced the namespace in DLL 2 thus using namespace startProc, within that I have two classes the class i wish to get to is called Processstarter, within there there is a public static void run(args1,args2)

When i try and access run from within the in main(void)I get an error "Error c3861:Run: Identifier Not found", Please forgive me as I'm new to C++, I prefer c# instead.

Does this make sense what I'm trying to do?

All i want to do is call a method in a class in a namespace in a c# dll.

Help!!!

Re: how to reference a c# DLL from a c++ DLL

Software_Developer10-Aug-12 4:21

Software_Developer

10-Aug-12 4:21

Look [here] and/or read [this] article.

Re: how to reference a c# DLL from a c++ DLL

Richard MacCutchan10-Aug-12 21:42