How to cancel long time drawing - C / C++ / MFC Discussion Boards

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Re: How to add Event handler to dynamically created Button

hemlat13-Apr-09 23:05

hemlat

13-Apr-09 23:05

thanks for your reply.I have declared one function.I have added entry in message map.
It is working for me.

Re: How to add Event handler to dynamically created Button

Hamid_RT13-Apr-09 23:54

Hamid_RT

13-Apr-09 23:54

You can insert this code on your code and then if you want you can make your button.
#define IDC_DYNAMICBUTTON 3000

BEGIN_MESSAGE_MAP(CMFCDlg, CDialog)
ON_BN_CLICKED(IDC_DYNAMICBUTTON,&CMFCDlg::OnBnClickedbutton)
END_MESSAGE_MAP()

void CMFCDlg::OnBnClickedbutton()
{
}

//header file
public:
afx_msg void OnBnClickedbutton();

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

How do I catch the 0xC0000005 Exception?

mildred-frontfree13-Apr-09 21:33

mildred-frontfree

13-Apr-09 21:33

I need to catch the 0xC0000005 Exception in my code. I've tried try{}catch(CException *e){}, but it didn't work.

Re: How do I catch the 0xC0000005 Exception?

_AnsHUMAN_ 13-Apr-09 21:41

_AnsHUMAN_

13-Apr-09 21:41

I think you are on the look out for First and Second chance exception[^]

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: How do I catch the 0xC0000005 Exception?

mildred-frontfree13-Apr-09 21:44

mildred-frontfree

13-Apr-09 21:44

Well, I've already searched Google, And I found using SEH could resolve this problem. But in my case, the code which throw the Exception is a dll. So the SEH didn't work for me.

Re: How do I catch the 0xC0000005 Exception?

ParagPatel13-Apr-09 23:35

ParagPatel

13-Apr-09 23:35

normal C++ not handling "0xC0000005 Access Violation Error"" exception, you need to give more compiler option to handle it.

but you can try "__try __except", exception handling of C, it will help you. Usage[^]

Parag Patel

Re: How do I catch the 0xC0000005 Exception?

mildred-frontfree13-Apr-09 23:42

mildred-frontfree

13-Apr-09 23:42

Thanks for your suggestion!
I tried it before, but it didn't work. Anyway, I found it is better to fix this problem in the dll file which throw the exception using __try__catch.

How to cancel long time drawing

fitatc13-Apr-09 21:31

fitatc

13-Apr-09 21:31

I am writing a code to do a long time draw like:

void MyDialog::DoSlowDraw(DWORD tDelay){
     while(notFinished){
        DrawNextLine(); // like LineTo()....
        Sleep(tDelay);
     }
 }

And it's better to have a "cancel button" because it may take a long time according to tDelay.
---------------------
Cry | :((

My try:
To handle "cancle button clicked Message" , Drawing must be done by another thread.

UINT DrawProc( LPVOID pParam )
{
    CMyDialog* pform = (CMyDialog*)pParam;
    int timeDelay = pform->timeD;
    Line_list* pLines = pform->m_pLines;
    CClientDC cdc(pform);
    //Draw....

It's worked, but as far as I know
1. Work thread should not touch the GUI ---- (Do the drawing).
2. MFC object should not passed to another thread ---- (passing drawing data by CMyDialog*)

Confused | :confused:

Is there a good way to cancle long time drawing.

Re: How to cancel long time drawing

David Crow14-Apr-09 3:11

David Crow

14-Apr-09 3:11

fitatc wrote:
Is there a good way to cancle long time drawing.

See here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: How to cancel long time drawing

fitatc14-Apr-09 22:31

fitatc

14-Apr-09 22:31

May be You misunderstanding my qustion because of my poor english.
My Question is "How to do multiThread thing in one GUI thread." in another word.

But by your advise, I did find the answer from old Qustions By another guy:
http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=570370[^]

Re: How to cancel long time drawing

David Crow15-Apr-09 3:02

David Crow

15-Apr-09 3:02

fitatc wrote:
May be You misunderstanding my qustion because of my poor english.

I understood you perfectly. If you are drawing in a worker thread and you need to cancel that thread, my advice is the way to go. Using a message pump is an antiquated and largely unused 16-bit Windows solution.

Re: How to cancel long time drawing

fitatc16-Apr-09 16:31

fitatc

16-Apr-09 16:31

Sorry for my late response,(I am in a busy work now)

You are right, but before that,
Confused | :confused:

Do you think it is OK to draw in the work thread?
I mean, a good design? because drawing is touching the GUI I thought, maybe I was wrong.

Re: How to cancel long time drawing

David Crow17-Apr-09 2:23

David Crow

17-Apr-09 2:23

fitatc wrote:
Do you think it is OK to draw in the work thread?

I would think not. Have the worker thread post a message to the main thread (that owns the UI).

How to retrieve bits from a file using MFC

Pankaj D.Dubey13-Apr-09 20:36

Pankaj D.Dubey

13-Apr-09 20:36

I am writing a code to read the bits from the file. Starting from first bit, i can read the whole file, and can retrieve the whole data as well. But if i want to retrieve the bits from somewhere between the file, how should i do this? One more thing, i am doing a string comparision of a module(and that module repeats several times in the file) and then i am retrieving the bits hence i can,t apply character counting.

It was a woman who drove me to drink but I never got opportunity to thank her

Re: How to retrieve bits from a file using MFC

Cedric Moonen13-Apr-09 20:56

Cedric Moonen

13-Apr-09 20:56

dubeypankaj wrote:
But if i want to retrieve the bits from somewhere between the file, how should i do this?

It depends on how you are reading your file. Are you using an ifstream, a FILE, a CFile, ... ? Typically, you can set the file pointer (e.g. CFile::Seek, ifstream::seekg, ...). You should look at the documentation for more information.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: How to retrieve bits from a file using MFC

KarstenK13-Apr-09 21:13

KarstenK

13-Apr-09 21:13

Read the file in binary mode completly in a buffer, and than you can do what you want. $Shucks | :-\$

Press F1 for help or google it.
Greetings from Germany

Regwrite in bat file

p_196013-Apr-09 20:09

p_1960

13-Apr-09 20:09

Hi,
May i know how can read and write registry thru batch file.....

Re: Regwrite in bat file

_AnsHUMAN_ 13-Apr-09 20:19

_AnsHUMAN_

13-Apr-09 20:19

Link[^]

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: Regwrite in bat file

birajendu13-Apr-09 20:19

birajendu

13-Apr-09 20:19

U can use reg command to do so. to know more http://commandwindows.com/reg.htm[^]

birajendu
CyberG India
Delhi
India

HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

birajendu13-Apr-09 20:02

birajendu

13-Apr-09 20:02

Hi,

I would like to build an win32 application which sould not inherit from explorer.exe. By default all MFC/Win 32 applications are loaded in explorer.exe. so any crash of application is causing crash to explorer and vice versa..

So i need to find out a way where my application wont be loaded in explorer.

Thanks in advance.

Birajendu
SonicWALL India.
Bangalore.
India

Re: HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

_AnsHUMAN_ 13-Apr-09 20:14

_AnsHUMAN_

13-Apr-09 20:14

birajendu wrote:
win32 application which sould not inherit from explorer.exe

I will tell you a trick, try to figure out where your application is crashing and why.
Fix the bug.

You need to google first, if you have "It's urgent please" mentioned in your question.
Wink | ;-)

_AnShUmAn_

Re: HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

birajendu13-Apr-09 20:26

birajendu

13-Apr-09 20:26

Obviosly i will do that. But that is not the only solution. It would be nice if we can luch programs with out inheriting from explorer.exe. I saw some apllication from some trusted venders used to do so.. they dont load their application on explorer.

birajendu
CyberG India
Delhi
India

Re: HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

Cedric Moonen13-Apr-09 20:35

Cedric Moonen

13-Apr-09 20:35

birajendu wrote:
It would be nice if we can luch programs with out inheriting from explorer.exe

Well, that's the case. I have no clue about what you mean by "inheriting explorer"... If your application crashes, explorer doesn't crash. They are two independant things, so why would they interfere ? Unless maybe you are talking about something specific like a shell extension ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

birajendu14-Apr-09 1:01

birajendu

14-Apr-09 1:01

yeah.. not exactly inheriting.. but all the applications in window by default load on explorer, some thing like child process of explorer. And my application is also doing the same. But i saw some applications like MacAfee client are independent.

birajendu
CyberG India
Delhi
India

Re: HOW TO MAKE A WIN32 APPLICATION NOT INHERITING FROM EXPLORER.EXE?

David Crow14-Apr-09 3:15

David Crow

14-Apr-09 3:15

birajendu wrote:
But i saw...

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