C / C++ / MFC Discussion Boards

benjymous10-Jun-05 4:31

10-Jun-05 4:31

Has anyone else seen asserts getting thrown when the condition blatantly evaluates to true when viewed in the debugger?

I think the application I've inherited just wants to cause me grief :-S

---------------------------
Microsoft Visual C++ Debug Library
---------------------------
Debug Assertion Failed!

File: z:\sdk\microsoft\vc71\atlmfc\include\afxtempl.h
Line: 321

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.

(Press Retry to debug the application)
---------------------------
Abort Retry Ignore
---------------------------

afxtempl.h line 321 is

ASSERT(nIndex >= 0 && nIndex < m_nSize);

and
nIndex = 180
m_nSize = 181

arrgh!!!!!

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Re: Insane asserts

Roger Garrett10-Jun-05 4:46

Roger Garrett

10-Jun-05 4:46

That sure looks pretty weird.

Maybe try adding some parentheses:

ASSERT((nIndex >= 0) && (nIndex < m_nSize));

or...

BOOL bItIsTrue = ((nIndex >= 0) && (nIndex < m_nSize));
ASSERT(bItIsTrue);

and see how it behaves,

Re: Insane asserts

benjymous10-Jun-05 5:02

benjymous

10-Jun-05 5:02

That was my thought as well, until I realised that the misbehaving code is part of MFC, so not something I can tinker with $Shucks | :-\$

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Re: Insane asserts

Roger Garrett10-Jun-05 5:25

Roger Garrett

10-Jun-05 5:25

Are you certain that you're looking at the correct ASSERT, i.e. the correct position within the correct afxtempl.h file? Did the debugger take you directly to the offending line of code, or did you just look for the afxtempl.h file and go to the specified line? I took a look at afxtempl.h on my machine and that line number doesn't have an ASSERT. There's lots of references to m_nSize but noone contained within an ASSERT. So maybe you're looking at a wrong afxtempl.h file.

Re: Insane asserts

JWood10-Jun-05 5:04

JWood

10-Jun-05 5:04

Ususally it's the other way around it should assert when an index is outside the size of the container. Where is it located? If it is a bug in MFC, you might be able to avoid it by using a another overloaded operator/function to steer it away from that code.

Re: Insane asserts

BlackDice10-Jun-05 9:32

BlackDice

10-Jun-05 9:32

I had this problem once. I don't know if this is the same with you, but I actually had the project in RELEASE mode instead of DEBUG while stepping through it. that made the values show up incorrectly.

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Disable or Enable a Button

Hachaso10-Jun-05 3:51

Hachaso

10-Jun-05 3:51

Hi!

I'm wondering how to Disable and Enable a button.
For example I'm trying to create a small program where you mark a checkbox, doing
this Enables the button to continue. If it's unchecked the button is disabled.

To make it disabled is easy, cause I make it as default as disabled.
My problem is how do I do to Enable it when the checkbox is checked?

I'm writing it in Win32 API...no MFC

Please help!

GetDlgItem(IDC_YourButton)->EnableWindow(true);

bghuang10-Jun-05 3:58

bghuang

10-Jun-05 3:58

true/false

Re: GetDlgItem(IDC_YourButton)->EnableWindow(true);

Bob Stanneveld10-Jun-05 4:06

Bob Stanneveld

10-Jun-05 4:06

Hachaso wrote:
I'm writing it in Win32 API...no MFC

Your code snippet is MFC code, Hachaso is using the Win32 API's... D'Oh! | :doh:

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... is the police. - Conspiracy brother

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Re: Disable or Enable a Button

Bob Stanneveld10-Jun-05 4:02

Bob Stanneveld

10-Jun-05 4:02

Hello,

Does the following code help?

::EnableWindow(::GetDlgItem(hYourDlgHandle, IDC_YOURBTNCTRLID), bEnable);

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... is the police. - Conspiracy brother

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WDM -- INF file & makefile Differences between X86 and X86-64/AMD64

Neha.marwaha10-Jun-05 2:01

Neha.marwaha

10-Jun-05 2:01

I have to port 32-bit driver on 64 bit application.

Could anybody tell me the INF file & makefile Differences between X86 (32-bit) and X86-64/AMD64.

Re: WDM -- INF file & makefile Differences between X86 and X86-64/AMD64

Alexander ^M.,10-Jun-05 3:03

Alexander ^M.,

10-Jun-05 3:03

Easy!
Change the [Manufacturer] section like that:
[Manufacturer]
%<name>%=<section name>, NTamd64

Now there has to be another section called [<section name>.NTamd64], which is followed by the device descriptions.

This is the way how to convert an inf file for a x64 driver.

For more information, also for other platforms, have a look at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/install/hh/install/create-inf_7b2e3686-a26f-4383-8e78-16725443ecb4.xml.asp[^].

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

IWebBrowser anchor doesn't work?

ThinkingPrometheus10-Jun-05 1:37

ThinkingPrometheus

10-Jun-05 1:37

hiho@ll

i'm using the simplebrowser from this site (http://www.codeproject.com/miscctrl/simplebrowserformfc.asp)
and i have the following problem:

i'm loading a website from a local file which has anchors defined to jump e.g. to the bottom of the file

using the simplebrowser i can navigate through web using google and the anchors are working!

using my local file i get "blank#anchoridentifaction" in the IWebBrowser window
??

anybody knows what could be the problem?
if i open the local file using IE the anchors are working!! but with simplebrowser they don't

is it a problem of simplebrowser itself or of the IWebBrowser interface?
may i have to set some options?

thx@ll

Urgent help needed for printing the content of RichEditControl

P. Gnana Prakash10-Jun-05 1:20

P. Gnana Prakash

10-Jun-05 1:20

Hi all,

I am developing dialog based application with RichEditControl. In my application, the requirement is send the richedit control data to the printer.

if any one have the snippet for the same, please let me know.

In mircrosoft site "http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/richedit/richeditcontrols/aboutricheditcontrols.asp" i found that using EM_FORMATRANGE and EM_DISPLAYBAND messages we can attain the print functionality. But i don't know how to implement it. If any one know please let me know.

Regards,
Gnanaprakash Ponnusamy

A Journey of thousand miles must begin with a single step.

Question about MultiThreading

Aqueel10-Jun-05 0:51

Aqueel

10-Jun-05 0:51

Hello
I am working with MultiThreading in MFC. I have written following piece in my code. But there is an error. Can anyone tell me why this error is comming.

Code is...

void CMyThreadrDlg::OnCreateThread()
{
if (m_check) // if check box is checked
{
int *i = new int(10000);
CWinThread *pThread = AfxBeginThread(getTime, i);
}
}

UINT CMyThreadDlg::getTime(LPVOID param)
{
DWORD result =0 ;

MessageBox("Thread created", "Success");

AfxEndThread(0);
return result;

}

Error is there where I have wrote,
CWinThread *pThread = AfxBeginThread(getTime, i);

Error Message is...

none of the 3 overloads can convert parameter 1 from type 'unsigned int (void *)'
Please help me

Thanks
Aqueel A. Mirza

We Believe in Excellence

Re: Question about MultiThreading

Cedric Moonen10-Jun-05 1:04

Cedric Moonen

10-Jun-05 1:04

The problem is that you pass to AfxBeginThread a member function of a class. This won't work because a member function does't not have the same calling convention as a standard function (the this pointer is passed implicitely).

Thus you need to use a global function. If your thread needs to access some member variables of the class that started the thread, you can pass the pointer to the class in the parameter:

UINT getTime(LPVOID param)<br />
{<br />
CMyThreadDlg* pDlg = (CMyThreadDlg*)param;<br />
<br />
//Do things with pDlg...<br />
<br />
//Don't need to call AfxEndThread because the thread will finish automatically when this function returns<br />
return 0;<br />
}<br />

And to spawn the thread:

void CMyThreadrDlg::OnCreateThread() <br />
{<br />
if (m_check) // if check box is checked<br />
{<br />
CWinThread *pThread = AfxBeginThread(getTime, this);  // pass the this pointer in the argument<br />
}<br />
}<br />

Also, you don't need to call AfxEndThread before leaving the thread function because the thread will automatically finishes when this function exits.

Re: Question about MultiThreading

Stlan10-Jun-05 1:14

Stlan

10-Jun-05 1:14

But if you want absolutely that the thread procedure be a member of the class, there is a simple solution: declare the thread procedure as static function member and pass this pointer as parameter to the thread, so that you are able to call a non-static member function of the class as true thread procedure.

class A<br />
{<br />
  public:<br />
  VOID StartThread();<br />
<br />
  private:<br />
  static LRESULT ThreadProc(LPVOID pParam);<br />
  VOID DoThread();<br />
}<br />
<br />
VOID A::StartThread()<br />
{<br />
  AfxBeginThread(ThreadProc, this);<br />
}<br />
<br />
LRESULT A::ThreadProc (LPVOID pParam)<br />
{<br />
  A *This = (A*)pParam;<br />
  This->DoThread();<br />
  return 0L;<br />
}<br />
<br />
VOID A::DoThread()<br />
{<br />
  // Do something here...<br />
}

Re: Question about MultiThreading

Cedric Moonen10-Jun-05 2:06

Cedric Moonen

10-Jun-05 2:06

Yes of course...
But the only advantage I see in this method is to avoid having a global function. Is there any other advantage ?

Re: Question about MultiThreading

Stlan10-Jun-05 2:19

Stlan

10-Jun-05 2:19

It's perhaps only a matter of design but I assume that the worker thread is part of the object and is related to its internal working. So for me, it makes sense that the thread procedure be physically a function member of the class so that it can access to other private data (which the global function can't) Anyway I don't like too much global functions in C++.

Re: Question about MultiThreading

David Crow10-Jun-05 6:19

David Crow

10-Jun-05 6:19

See here.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Constructing a parser

dittygrail9-Jun-05 23:33

dittygrail

9-Jun-05 23:33

I need to construct a parser.My application is in MFC.
How to build a parser with simple construction procedure.
It also has to applicable for the project objects.
please avoid the concept of Activex scripting...

Re: Constructing a parser

Stlan10-Jun-05 0:11

Stlan

10-Jun-05 0:11

Not sure to understand what you mean. If you need to parse a string containing items separated by known constant characters, it may be sufficient to use CString::Tokenize; then you need to build a structure representing the logical content of the string, so that it will be easier then to manipulate the data. It's actually a very vast subject.

Re: Constructing a parser

toxcct10-Jun-05 0:24

toxcct

10-Jun-05 0:24

not sure i understand neither, but if you want a not too difficult method to parsing a language, you could read my article VisualCalc...

cheers,

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Constructing a parser

toxcct10-Jun-05 1:31

toxcct

10-Jun-05 1:31

CodeProject Parsers...[^]

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Constructing a parser

ThatsAlok10-Jun-05 1:41

ThatsAlok

10-Jun-05 1:41

You getting very fast these days, How dare, you use your HAND for TYPING! Mad | :mad:

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cheers,
Alok Gupta

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