C / C++ / MFC

6-Feb-02 12:31

Hi everyone. I have a few buttons on a dialog, and when the window resizes, I want the buttons to stay at a fixed distance from the bottom of the dialog window's client area.

<br />
CRect rect;<br />
GetClientRect(rect);<br />
// put 40 pixels up from bottom of screen<br />
rect.bottom -= 40<br />
GetDlgItem(IDC_BTN_ADDITEM)->MoveWindow(rect);<br />

I even tried making the button a variable, and tried doing m_btnAddItem.MoveWindow(rect), and it also caused the same assertion.

When the code executes, I get an assertion error in winocc.cpp, line 279, below

<br />
void CWnd::MoveWindow(int x, int y, int nWidth, int nHeight, BOOL bRepaint)<br />
{<br />
	ASSERT(::IsWindow(m_hWnd));<br />
...<br />
}<br />
<br />
Can anyone tell me the proper way to move the control, so it does not assert? Thanks in advance!

Joaquín M López Muñoz6-Feb-02 12:35

6-Feb-02 12:35

On which function of your dialog is this code inserted?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

John Clump6-Feb-02 14:48

6-Feb-02 14:48

In OnSize()

Josh Koppang6-Feb-02 12:42

6-Feb-02 12:42

You're calling MoveWindow before it has an h_Wnd
try this;

<br />
if(GetDlgItem(IDC_BTNADDITEM)->m_hWnd)<br />
  MoveWindow(rect);<br />

Josh Koppang6-Feb-02 12:49

6-Feb-02 12:49

Sorry, I meant for it to be this:

if(::IsWindow(GetDlgItem(IDC_BTNADDITEM)->m_hWnd))
MoveWindow(rect, TRUE);

Are you calling it from OnSize? I did this in my own code, and when it is resized when it is initially displaying it, I guess it doesn't have an m_hWnd. If it still doesn't work, use class wizard to create a class for it (control class) then use that to get the m_hWnd

Josh

John Clump6-Feb-02 16:19

6-Feb-02 16:19

That worked, thanks! I just had to change m_hWnd to GetSafeHwnd(), it causes an access violation if you use m_hWnd.

This brings up another question. I am resizing in the code below, which does center the button horozontally and keeps the button at the same place vertically.

<br />
	CRect rect;<br />
	<br />
	rect.left = cx - (415 + 102);<br />
	rect.right = rect.left + 40;<br />
	rect.bottom = cy - 40;<br />
	rect.top = rect.bottom - 14;<br />
	<br />
	if(::IsWindow(GetDlgItem(IDC_BTN_ADD)->GetSafeHwnd()))<br />
		GetDlgItem(IDC_BTN_ADD)->MoveWindow(rect, TRUE);<br />

In the code above, I specify 40 to be the width of the button, and the 14 to be the height. But when the button is drawn, the button appears to be 10 in height, if it were drawn in the resource editor, and the width appears to be about 25. Is there way to adjust this, so the button appears like it would in the resource editor, that is, with a height of 10 and a width of 40?

Josh Koppang6-Feb-02 23:39

6-Feb-02 23:39

For grins, try using the other version of MoveWindow() and specify the width and height in the parameters, and seee if that works.

Josh

John Clump7-Feb-02 17:46

7-Feb-02 17:46

I tried it, and it still produced buttons which are too small. At the risk fo sounding dumb (which isn't uncommon for me Smile | :)

) I always assumed that the resource editor and code functions all used the same units (pixels). If they are not the same, is there a formula or ratio to convert resource editor units to code units, so to speak?

jagadish bharath2-Aug-02 0:47

jagadish bharath

2-Aug-02 0:47

May be try this
GetDlgItem(IDC_BTN_ADDITEM)->ShowWindow(SW_HIDE);
GetDlgItem(IDC_BTN_ADDITEM)->MoveWindow(rect);
GetDlgItem(IDC_BTN_ADDITEM)->ShowWindow(SW_SHOW);

First word

6-Feb-02 12:05

Is there a specific code for MS C++ 6.0 to find the length of the FIRST word in ANY string.
Ex: (This is my sentence)

The length of the first word is 4.

Thank you

Re: First word

Michael Dunn6-Feb-02 12:03

Michael Dunn

6-Feb-02 12:03

Use strtok:

LPCTSTR szSentence = _T("This is the stuff.");
LPCTSTR pszWord;
 
  pszWord = _tcstok ( szSentence, _T(" ") ); // Find first token, using " " (space) as the delimiter.

--Mike--
"Everyone has figured out what 'service pack' really means, so they had to go and change the language. Perhaps this is what Bill was talking about in the 'security is top priority' letter."
-- Daniel Ferguson, 1/31/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

Re: First word

Josh Koppang6-Feb-02 12:16

6-Feb-02 12:16

http://www.codeproject.com/string/tokenizer.asp

<br />
CTokenizer tok("This is my Sentence", " ");<br />
CString sen;<br />
<br />
if(toh.Next(sen))<br />
  sen.GetLength();<br />
<br />

Think this is right

Josh

Re: First word

Joaquín M López Muñoz6-Feb-02 12:18

6-Feb-02 12:18

Another method, if you happen to like iostreams:

std::string sentence="One ring to bind them all";
std::string first_word;
std::istringstream(sentence)>>first_word;
std::string::size_type length_first_word=first_word.size();

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Mem leak detection

alex.barylski6-Feb-02 11:57

alex.barylski

6-Feb-02 11:57

Hey all.

new/delete in there default implementation use the default heap returned by GetProcessHeap()(????)

If this is correct, does this mean I could manually detect memory leaks by comparing the HeapSize at startup to HeapSize at destruction...?

What about detecting GDI, or Virtual, GLobal, Malloc memory leaks...?

Can I use GlobalMemoryStatus() again to find the difference of memory useage(Would indicate memory leakage???) at startup and destrcution...? This probably wouldn't be that accurate huh...? How do tools like Stress return there values, is this an example of GlobalMemStatus()...?

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Mem leak detection

Joaquín M López Muñoz6-Feb-02 12:10

Error reading standard string resources

6-Feb-02 12:10

new/delete uses a private heap, so I'm afraid GetProcessHeap won't do. Fortunately, in debug mode you can use

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt__crtmemdifference.asp">_CrtMemDifference</a>

and related functions (in <crtdbg.h>) to check for memory leaks caused by C run-time library allocations (malloc, realloc and new).
As for other functions that also allocate memory, I don't know (right off the top of my hat) of any easy method to detect leaks.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Mem leak detection

alex.barylski6-Feb-02 12:34

alex.barylski

6-Feb-02 12:34

Thanx again Joaquín.

This will do for now...

Cheers Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

6-Feb-02 10:41

Hello,
I have problems in one of my applications (others are very similar and without this problem).
The problem is:
When I run application I've got ASSERTION FAIL in file DOCSINGL.CPP at line 216

// use generic 'untitled'VERIFY(strDocName.LoadString(AFX_IDS_UNTITLED));

I don't know why it cannot find string with ID AFX_IDS_UNTITLED. If I define it manualy in a string table, I can run just a Debug version. A Release version give me unhandled exception in KERNEL32.dll
I included all standard files(afxres.rc,...).
Can anybody help me please?
Thanks
Peter

Re: Error reading standard string resources

Joaquín M López Muñoz6-Feb-02 11:50

Re: Error reading standard string resources

6-Feb-02 11:50

Try with the "Rebuild all" command. Sometimes the dependency engine goes nuts and plays little tricks like that.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Josh Koppang6-Feb-02 12:39