Re: How to share data in a same dll loaded by different process? - C / C++ / MFC Discussion Boards

Re: Changing the Font of a Dialog Static Label

Hamid_RT13-Oct-06 1:04

Hamid_RT

13-Oct-06 1:04

If you have a variable for their you can use of m_Static.SetFont(GetFont());

WhiteSky

Re: Changing the Font of a Dialog Static Label

David Crow13-Oct-06 3:06

David Crow

13-Oct-06 3:06

See the Extras section of this article.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

COM Object

LOUIS Christian12-Oct-06 20:44

LOUIS Christian

12-Oct-06 20:44

The situation is :
-launch of release application using my COm object => memory leaks when I use Function to get data with an SafeArray.
- launch of release application in VC++ 6.0 with debug => no memory leak.

What is the difference, what are dll that are used? Have someone an explication?
Thank you for a response Confused | :confused:

and help

LOUIS Christian

Re: COM Object

prasad_som12-Oct-06 21:01

prasad_som

12-Oct-06 21:01

Post code, that giving this problem.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: COM Object

Hamid_RT13-Oct-06 8:15

Hamid_RT

13-Oct-06 8:15

if you have a memory leak you can use of visual Leak detector - Enhanced Memory Leak detection for visual C++ [^]maybe its some helpful for you

WhiteSky

How to lock object externally?

kiranin12-Oct-06 20:12

kiranin

12-Oct-06 20:12

Hi,

For some odd reason, I am not able to Register the COleDropTarget.
I have been working with my project for a while, so I suspect it is
something within my project.

I do have the member variable COleDropTarget m_dropTarget in the header.
Then, in the OnInitialUpdate, I call m_dropTarget.Register(this).

// register drop target
BOOL b = m_dropTarget.Register(this);

It keeps failing at the if(CoLockObjectExternal()) shown below.

Does anybody know what CoLockObjectExternal means?

BOOL COleDropTarget::Register(CWnd* pWnd) 
{ 
 ASSERT_VALID(this); 
 ASSERT(m_hWnd == NULL); // registering drop target twice? 
 ASSERT_VALID(pWnd); 


 LPUNKNOWN lpUnknown = (LPUNKNOWN)GetInterface(&IID_IUnknown); 
 ASSERT(lpUnknown != NULL); 


 // the object must be locked externally to keep LRPC connections alive 
 if (CoLockObjectExternal(lpUnknown, TRUE, FALSE) != S_OK) 
  return FALSE;

How to share data in a same dll loaded by different process?

Best Kiluyar12-Oct-06 19:27

Best Kiluyar

12-Oct-06 19:27

Hi,

I write a dll which will be loaded by different application. Currently, I need to share some data between the same dlls loaded in different processes. How can I do? Is there a simple way?
I consider to use a file to stored the data shared. But I must write/read the data frequently. So I think use file is not a good way.

Re: How to share data in a same dll loaded by different process?

Don Fletcher12-Oct-06 21:10

Don Fletcher

12-Oct-06 21:10

Hi,

You should look into "shared memory" - it is relatively easy and will accomplish what you want.

Try this one: http://www.codeproject.com/threads/sm.asp[^]

Re: How to share data in a same dll loaded by different process?

Blake Miller13-Oct-06 4:29

Blake Miller

13-Oct-06 4:29

You can place the data into a shared data segment.
Be sure to protect access to it with some sort of thread-safe synchronization mechanism.

Any sufficiently gross incompetence is nearly indistinguishable from malice.

access database

With_problem12-Oct-06 18:02

With_problem

12-Oct-06 18:02

Good day everyone, Rose | [Rose]

I'm doing a project with Vc++6.0 database MS Access

I'm struggling with the connection and coding with database.

Does anyone know where I can get a tutorial of how to connect to database and manipulate with data?

Thanks for your help in advance.

Re: access database

prasad_som12-Oct-06 19:15

prasad_som

12-Oct-06 19:15

abrakadbra wrote:
Does anyone know where I can get a tutorial of how to connect to database and manipulate with data?

Here[^]

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: access database

Hamid_RT12-Oct-06 19:47

Hamid_RT

12-Oct-06 19:47

See Microsoft Access in this[^] link

WhiteSky

Re: access database

David Crow13-Oct-06 3:05

David Crow

13-Oct-06 3:05

abrakadbra wrote:
Does anyone know where I can get a tutorial of how to connect to database and manipulate with data?

I show how to do that here.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Bizarre VC++ compiler error

ljr2412-Oct-06 16:24

ljr24

12-Oct-06 16:24

I keep getting this error from the compiler which I'm trying to decipher (if it even is an error), that pops up and misteriously disappears with no realation to the changes I've made to the code.

ReflectRefract virtual void * __thiscall std::length_error::`vector deleting destructor'(unsigned int)" (??_Elength_error@std@@UAEPAXI@Z) from CChildWndArranger.obj
Replaced symbol(s):
"public: virtual void * __thiscall std::logic_error::`scalar deleting destructor'(unsigned int)" (??_Glogic_error@std@@UAEPAXI@Z) from CChildWnd.obj
"public: virtual void * __thiscall std::out_of_range::`scalar deleting destructor'(unsigned int)" (??_Gout_of_range@std@@UAEPAXI@Z) from CChildWnd.obj

and this other error

ReflectRefract virtual __thiscall std::length_error::~length_error(void)" (??1length_error@std@@UAE@XZ) from CChildWndArranger.obj
Replaced symbol(s):
"public: virtual __thiscall std::logic_error::~logic_error(void)" (??1logic_error@std@@UAE@XZ) from CChildWnd.obj
"public: virtual __thiscall std::out_of_range::~out_of_range(void)" (??1out_of_range@std@@UAE@XZ) from CChildWnd.obj

I'm using VS .NET 2002 sp1. Help would be greatly appreciated.

Re: Bizarre VC++ compiler error

prasad_som12-Oct-06 20:39

prasad_som

12-Oct-06 20:39

Can you show code, probably causing this error?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Printing bitmaps from a frame grabber

Bob Hickey12-Oct-06 16:22

Bob Hickey

12-Oct-06 16:22

I am working on an MFC application (Visual Studio/C++) that has to grab a screen shot from a frame grabber and send it to the default printer with landscape orientation. This has to be done with no operator intervention other than clicking on a "Print" button in the main dialog - no preview or print dialog. I'm able to grab the frame, but I'm having no success with the printing.

Any help would be greatly appreciated.

Bob.

Re: Printing bitmaps from a frame grabber

Hamid_RT12-Oct-06 19:54

Hamid_RT

12-Oct-06 19:54

How to send and what happen when you send?

WhiteSky

Re: Printing bitmaps from a frame grabber

Steve S12-Oct-06 21:40

Steve S

12-Oct-06 21:40

CPrintDialog dlg(FALSE);
dlg.GetDefaults();

If the call returns non-zero, will have filled in everything, including a printer DC. You can then use this to do your printing, although if you want landscape, you will need to alter the DEVMODE stuff to suit.

Steve S
Developer for hire

Re: Printing bitmaps from a frame grabber

Bob Hickey14-Oct-06 16:00

Bob Hickey

14-Oct-06 16:00

Thanks for the suggestions.... I think I should have worded my original question a little better though.

What I have is not a "bitmap" in the MFC sense, but a pointer to a big bunch of pixels. I can't seem to figure out how to get these in a form that can be printed - what comes out on the printer is just a black rectangle.

Thanks in advance...

Bob.

Dialog 'hang' after C procedure called.

searcher0812-Oct-06 15:56

searcher08

12-Oct-06 15:56

I have completed this dialog window reading in filenames and a progress bar to indicate progress. A timer is used to update the progress bar.

However, when I called a C procedure that is computationally intensive, all the edit boxes and menu went blank. The worst thing was that the progress bar was not incrementing. Do take note that the program is running fine except for these side effects. The processed output was tested to be correct.

Before I include the C procedure, testing was done to make sure the dialog windows work well with the progress bar etc.

Please advise if the computationally intensive C procedure resulted in this issue. If yes, how do I overcome it.

searcher08

Re: Dialog 'hang' after C procedure called.

Christian Graus12-Oct-06 15:58

Christian Graus

12-Oct-06 15:58

Your app needs to be multithreaded, so the UI updates while your code is taking up lots of CPU. Otherwise, the paint messages are not handled, and your window is not drawn.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

Re: Dialog 'hang' after C procedure called.

XuShanghua12-Oct-06 17:07

XuShanghua

12-Oct-06 17:07

Can I look your code! May be I can make it better! and then sent it to you.

---++Xu Shanghua

Re: Dialog 'hang' after C procedure called.

Hamid_RT12-Oct-06 19:51

Hamid_RT

12-Oct-06 19:51

You send a thread to Mr Christian Graus Roll eyes | :rolleyes:

you can answer directly to sender question Smile | :)

WhiteSky

Re: Dialog 'hang' after C procedure called.

searcher0813-Oct-06 7:43

searcher08

13-Oct-06 7:43

I have not done multi-threading before but looking at the reference books and online tutorial, they are all related to classes or objects. I am only calling a C procedure with a parameter in it.

The function needs to be in this form. Do I have to convert my C-procedure to this format? Mine is of the format void decode(char *).

UINT MyThreadProc( LPVOID pParam ) // taken from MSDN
{
CMyObject* pObject = (CMyObject*)pParam;

if (pObject == NULL ||
!pObject->IsKindOf(RUNTIME_CLASS(CMyObject)))
return 1; // if pObject is not valid

// do something with 'pObject'

return 0; // thread completed successfully
}

Next will be to begin the thread:
pNewObject = new CMyObject;
AfxBeginThread(MyThreadProc, pNewObject);

Where do I put my C-procedure in the above code?
How do I know that the thread has ended?

Thank you.

searcher08

Re: Dialog 'hang' after C procedure called.

Christian Graus13-Oct-06 8:03

Christian Graus

13-Oct-06 8:03

Any function that starts with Afx is part of MFC. You can write threaded code without using MFC, and therefore without this format.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog

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