Re: C/C++ files with "Ex" suffixes - C / C++ / MFC Discussion Boards

Variable in flash memory - how to write?

elelont29-Dec-14 20:43

elelont2

9-Dec-14 20:43

Hi,
I read that i can set a variable in flash memory like this (PIC32):

C++

uint8 Gain_factor_Den_17[128] __attribute__((space(prog), section(".table_flash_control")));

But what happens when i change that variable, flash has some requirements (e.g. need to erase page before writing etc). Who will handle that?

Re: Variable in flash memory - how to write?

Jochen Arndt9-Dec-14 21:33

Jochen Arndt

9-Dec-14 21:33

The variable is read only for your program. It is up to you to handle writing to it.

See the Microchip article Data EEPROM Emulation for PIC18, PIC24, dsPIC, PIC32[^]. There is also a library that emulates an EEPROM using the program flash memory.

But you should take care of the limited write endurance of your PIC device. If you need to change the variable frequently, you should use an external EEPROM.

Re: Variable in flash memory - how to write?

elelont29-Dec-14 22:39

elelont2

9-Dec-14 22:39

Thanks for the response, but i am still a little confused.

Just theoretically, what happens if i were to write:

C++

uint8 Table[128] __attribute__((space(prog), section(".table_flash_control"))); // Create variable in flash memory
...
Table[0] = 13; // Is it written to flash now?

Unfortunately i cannot try it, just trying to understand the logic. I am aware that the flash memory has only some certain write lifespan.

Re: Variable in flash memory - how to write?

Jochen Arndt9-Dec-14 23:28

Jochen Arndt

9-Dec-14 23:28

The flash memory of the PIC controllers is the program memory where code is stored. You can initialize the variable at compile time and it will be written together with the program code.

To write to the program memory by the running program you need to execute special instructions. For the PIC 32 see section 5. Flash Programming[^ PDF] of the PIC32 Family Reference Manual.

A compiler or assembler may provide functions or macros to perform the writing or compilers may have built-in support for writing. So the answer if the value is written depends on the used compiler. But if the compiler does not support writing to flash memory, you will get an error at compile time.

Re: Variable in flash memory - how to write?

elelont210-Dec-14 0:06

elelont2

10-Dec-14 0:06

Thanks, that clears it up!

C/C++ files with "Ex" suffixes

david211149-Dec-14 12:10

david21114

9-Dec-14 12:10

I noticed in the microsoft windows library they had two versions of what i assumed with similar files.

filename.h/filename.cpp and filenameEx.h/filenameEx.cpp

Anyone know how this "Ex" suffix is used? and what the relationship if any between the non-Ex and the "Ex" version?

Kind regards,

David

Re: C/C++ files with "Ex" suffixes

Garth J Lancaster9-Dec-14 13:25

Garth J Lancaster

9-Dec-14 13:25

it really depends on the company/implementation - I doubt there's any 'standard' meaning, eg 'Example', 'Extension' - the only way to know for sure is a side-by-side comparison using [insert name of your favourite diff/compare tool here]

Re: C/C++ files with "Ex" suffixes

David Crow9-Dec-14 16:49

David Crow

9-Dec-14 16:49

david21742 wrote:

Anyone know how this "Ex" suffix is used? and what the relationship if any between the non-Ex and the "Ex" version?

I always interpreted it as an "extended" version.

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Re: C/C++ files with "Ex" suffixes

«_Superman_»9-Dec-14 19:05

«_Superman_»

9-Dec-14 19:05

Basically it stands for an extended version.
Microsoft follows 2 conventions for extensions or newer versions of files / APIs / classes.

MFC has a CDialog class which is now extended to CDialogEx.
CDialogEx exists in a file called AfxDialogEx.h

There are several extended versions of APIs that follow this convention -
CreateWindow - CreateWindowEx
RegOpenKey - RegOpenKeyEx

The other convention that is followed is to add the numbers 2, 3, 4 ... to the end of the name.

Files that follow this convention are -
AfxPriv.h, AfxPriv2.h
AfxCmn.inl, AfxCmn2.inl, AfxCmn3.inl

This convention is followed by the COM interfaces -
IClassFactory, IClassFactory2
IPersistFolder, IPersistFolder2, IPersistFolder3

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

Re: C/C++ files with "Ex" suffixes

david2111412-Dec-14 3:32

david21114

12-Dec-14 3:32

thank you very much. i had to name something where it was in appropriate to overload, and I couldn't think of an appropriate name. i saw something in microsoft's thread or mutex library that used that naming convention. I should have realized Ex meant "extended", duh. Kind regards, Java | [Coffee]

NM_CUSTOMDRAW in an ATL dialog based application

aks.9-Dec-14 3:00

aks.

9-Dec-14 3:00

I have an ATL dialog based applications.
I have a custom list control derived from CListCtrl with message map
BEGIN_MESSAGE_MAP( MyListCtrl, CListCtrl )
ON_NOTIFY_REFLECT( NM_CUSTOMDRAW, &MyListCtrl::OnNMCustomDraw )
END_MESSAGE_MAP()
void MyListCtrl, ::OnNMCustomDraw( NMHDR *pNMHDR, LRESULT *pResult )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<nmlvcustomdraw*>( pNMHDR);

// Take the default processing
*pResult = CDRF_DODEFAULT;

if( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
else if( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )
{
int nRow = static_cast<int>(pLVCD->nmcd.dwItemSpec );
if( true == MyArray[nRow].bIsOlder )
{
pLVCD->clrText = RGB( 128, 128, 128 );
}
pResult = CDRF_DODEFAULT;
}
}
But I am not getting ant reflected message from the parent dialog.

I know that it can be done by using the REFLECT_NOTIFICATIONS() in the parent class. But I read that we have to derive the CListCtrl from CContained window. Is it the right way, if so what are things I have to take care.

Is there any better solution to resolve this issue?

aks

Re: NM_CUSTOMDRAW in an ATL dialog based application

Richard MacCutchan9-Dec-14 6:03

Richard MacCutchan

9-Dec-14 6:03

Are you certain that this works in ATL? According to http://msdn.microsoft.com/en-us/library/eeah46xd.aspx[^], this is only for MFC 4.0.

A Chinese blog about integrating MS Detours Library and Mhook library

Jamming18-Dec-14 15:11

Jamming1

8-Dec-14 15:11

Hello everyone, there is an article in Chinese discussing MS Detours API hooking library and Mhook library. I don't understand how to download the attachment and I can't understand the article. Could anyone who understands Chinese help me out here? Much appreciated in advance!! Please

Re: A Chinese blog about integrating MS Detours Library and Mhook library

Garth J Lancaster8-Dec-14 16:32

Garth J Lancaster

8-Dec-14 16:32

well, you might want to include the link to the article so people can find it

Re: A Chinese blog about integrating MS Detours Library and Mhook library

Jamming18-Dec-14 21:07

Jamming1

8-Dec-14 21:07

Here is the link:
标题: Detours x64 [Draft] [^]

Re: A Chinese blog about integrating MS Detours Library and Mhook library

Richard MacCutchan8-Dec-14 22:04

Richard MacCutchan

8-Dec-14 22:04

I suggest you post your question in http://www.codeproject.com/Forums/1580230/General-Chinese-Topics.aspx[^].

Re: A Chinese blog about integrating MS Detours Library and Mhook library

Jamming19-Dec-14 3:07

Jamming1

9-Dec-14 3:07

You're right. It's already been posted there now. Thanks

Is there a way to move the right-most button of a CMFCToolbar to the right most position (of the rect) ?

Maximilien8-Dec-14 4:38

Maximilien

8-Dec-14 4:38

Based on the "Visual C++ 2008 Feature Pack" sample VisualStudioDemo

I have a toolbar (CMFCToolbar) in a docking pane (CDockPane) that contains operations to be done on the content of the docking pane.

Currently, all the toolbar buttons are "aligned" from the left side; as it is expected when working with a toolbar.

Is there a way to move the right-most button in the toolbar to be at the right-most side or the rect (of the toobar) ?

for example ( in ascii art) to have something like this (toolbar is between [] )

C++

==================================================
| [button1|button2|button3|             button4] |
|------------------------------------------------|
|                                                |

The toolbar rect spans the whole width of the docking pane (also resizes when the docking pane resizes)

Looking at the CMFCToolbar documentation and code (afxtoolbar.cpp/.h) does not seem to offer some API to do that.

So, Am I chasing a wild goose?

Thanks.

Max.

I'd rather be phishing!

Re: Is there a way to move the right-most button of a CMFCToolbar to the right most position (of the rect) ?

Eugen Podsypalnikov12-Dec-14 1:28

Eugen Podsypalnikov

12-Dec-14 1:28

Yes, of course... Smile | :)

C++

// CYourToolBar : public CMfcToolBar

/*virtual*/ void CYourToolBar::AdjustLocations()
{
  __super::AdjustLocations();

  if (GetSafeHwnd())
  {
    int iCount(GetCount());
    if (iCount)
    {
      CRect crClient(0, 0, 0, 0);
      GetClientRect(crClient);

      CMFCToolBarButton* pcButton(GetButton(iCount - 1));
      if (pcButton)
      {
        CRect crPos(pcButton->Rect());
        if (crClient.right > crPos.right)
        {
          crPos.OffsetRect(crClient.right - crPos.right, 0);
          pcButton->SetRect(crPos);
          UpdateTooltips();
        }
      }
    }
  }
}

They sought it with thimbles, they sought it with care;
They pursued it with forks and hope;
They threatened its life with a railway-share;
They charmed it with smiles and soap. Smile | :)

modified 12-Dec-14 7:37am.

Re: Is there a way to move the right-most button of a CMFCToolbar to the right most position (of the rect) ?

Maximilien12-Dec-14 3:20

Maximilien

12-Dec-14 3:20

Excellent !!!

plug the code right in and works nearly ok; I have some minoe redraw issue that should be easy to track down.

Thumbs Up | :thumbsup:

Thanks.

I'd rather be phishing!

MFC Grid Control does not show cells content

georox6-Dec-14 2:37

georox

6-Dec-14 2:37

Hi All,

I'm facing the following strange problem using MFC Grid Control (by Chris Maunder) in my VS2010 MFC application:

I've included the CGridCtrl control in a dialog in order to let the user to edit data. It works fine but sometime when I open the dialog the cells content is not displayed but it's covered by the cell background color.

Unfortunately I can't solve the problem because it only happens randomly. I tried to call Invalidate() to both the CGridCtrl control and the dialog but it doesn't solve.

Any help would be greatly appreciated.

Thanks in advance.

Gianni

Re: MFC Grid Control does not show cells content

SoMad6-Dec-14 14:53

SoMad

6-Dec-14 14:53

Normally we would tell you to post this question in the forum at the bottom of the article: MFC Grid control 2.27[^], but I think it is ok for you to post it here as well.
Although Chris is around all the time, he is obviously very busy so there is no guarantee he is able to answer your question.

It is a very old project by now (it is article #8 here on CodeProject!), but I see that Chris did update it not too long ago. In your explanation of the problem, you need to include which version of Windows you are running it on an make sure to mention whether it is 32 or 64 bits.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Print a long CString

Gagnon Claude5-Dec-14 17:32

Gagnon Claude

5-Dec-14 17:32

Hi,
I have a C++ program with MFC.

I utilize the OnPrint() mechanism to print a Cstring line by line with pDC->TextOut().

That is working the first time I print.

If I repeat the print job, the page is blank.

I don't understand why.

Here is a portion of OnPrint():

CString resToken;

I print the Cstring one line at a time.

pDC->(TextOut(pt.x, pt.y + j * m_nHautLigne, resToken);

Does it have a better way to do the printing?

Why the page is blank the second time?

Do I have to reset something?

Thanks,

Re: Print a long CString

enhzflep5-Dec-14 20:26

enhzflep

5-Dec-14 20:26

From things you've said, I think you're talking about printing on paper instead of a screen.
There is indeed a process to follow when doing so, it involves telling the print sub-system that you've printed a page and wish to print another in the same print-job.

If indeed producing a hard-copy output is your aim, you may find the following of some use: Answer --> I want to print an image from a class library project without any gui.[^]

You can and should enumerate the available printers in your system and allow the user to choose from them. In this example, I've simply used the printer's name, as seen in Control Panel\Hardware and Sound\Devices and Printers in Win7.

"When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down 'happy'. They told me I didn't understand the assignment, and I told them they didn't understand life." - John Lennon

Re: Print a long CString

Richard MacCutchan5-Dec-14 22:18

Richard MacCutchan

5-Dec-14 22:18

Gagnon Claude wrote:

C++

pDC->(TextOut(pt.x, pt.y + j * m_nHautLigne, resToken);

That does not really tell us anything useful. You need to show where in your code you check for end of page, and exactly what index values you start with on the second page.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.