C / C++ / MFC

21-Mar-07 4:57

Hi,

//i have this:

char **Temp;
Temp = (char **)malloc(sizeof(char *));
*Temp = (char *)malloc(MAX_LIST);

//ok... now i want free the allocate memory...with..

free(Temp); <== Ok This work
free(*Temp); <== this NOT work

have you got an idea??? D'Oh! | :doh:

thanks a lot...

Cool | :cool:

Raiz82

toxcct21-Mar-07 5:05

toxcct

21-Mar-07 5:05

revert the order...

free(*Temp); //this first
free(Temp);

btw, are you coding in C or C++ ? because, if C++, then you'd better use new/delete (or new[]/delete[])

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Ing.Raiz8221-Mar-07 5:13

21-Mar-07 5:13

i use C++,

but i had reverted the order too.... but don't work...

this is the complete code of this section...

char **Temp;
Temp = (char **)malloc(sizeof(char *));
*Temp = (char *)malloc(MAX_LIST);
DWORD size = MAX_LIST;
CString sTemp,sTemp2;

if (RegQueryValueEx(pParentWnd->m_ListKey, RSS_KEY,0,NULL,(unsigned char *)*Temp,&size) == ERROR_SUCCESS)
{
//Temp[size] = '\0';

while(**Temp != '\0')
{
sTemp = strsepRss(Temp,';');

m_cRss1Combo.AddString(sTemp);
m_cRss2Combo.AddString(sTemp);
}

m_cRss1Combo.SetCurSel(0);
m_cRss2Combo.SetCurSel(1);
}
else
{
m_cRss1Combo.AddString(ECHO_LINK);
m_cRss2Combo.AddString(ECHO_LINK);
m_cRss1Combo.SetCurSel(0);
m_cRss2Combo.SetCurSel(0);
}

//posiziona i due combo box sul rss precedentemente salvato
if((m_cRss1Combo.FindStringExact(-1,pParentWnd->m_sRss1)) != -1)
m_cRss1Combo.SetCurSel(m_cRss1Combo.FindStringExact(-1,pParentWnd->m_sRss1));

if((m_cRss2Combo.FindStringExact(-1,pParentWnd->m_sRss2)) != -1)
m_cRss2Combo.SetCurSel(m_cRss2Combo.FindStringExact(-1,pParentWnd->m_sRss2));

UpdateString(pParentWnd->m_iVisualizationControl);

free(*Temp);//giulio
free(Temp);

but i don't understand....

Help me!!! ehhehehehehehhe

bye

David Crow21-Mar-07 5:19

21-Mar-07 5:19

Ing.Raiz82 wrote:
if (RegQueryValueEx(pParentWnd->m_ListKey, RSS_KEY,0,NULL,(unsigned char *)*Temp,&size) == ERROR_SUCCESS)

Have you tried:

BYTE Temp[1024];
DWORD size = sizeof(Temp);
if (RegQueryValueEx(pParentWnd->m_ListKey, RSS_KEY, 0, NULL, Temp, &size) == ERROR_SUCCESS)
    ...

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

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

Ing.Raiz8221-Mar-07 5:35

21-Mar-07 5:35

thanks for the interest.... but... if i change this....

/*
char **Temp;
Temp = (char **)malloc(sizeof(char *));
*Temp = (char *)malloc(MAX_LIST);
DWORD size = MAX_LIST;
*/

BYTE Temp[1024];
DWORD size = sizeof(Temp);
CString sTemp,sTemp2;

if (RegQueryValueEx(pParentWnd->m_ListKey, RSS_KEY,0,NULL,Temp,&size) == ERROR_SUCCESS)
{
//Temp[size] = '\0';

while(**Temp != '\0')
{
sTemp = strsepRss(Temp,';'); <==

////////////////Problem////////////////////
i have problem here because strsepRss ask char ** stringp
//////////////////////////////////////////

m_cRss1Combo.AddString(sTemp);
m_cRss2Combo.AddString(sTemp);
}

m_cRss1Combo.SetCurSel(0);
m_cRss2Combo.SetCurSel(1);
}
else
{
m_cRss1Combo.AddString(ECHO_LINK);
m_cRss2Combo.AddString(ECHO_LINK);
m_cRss1Combo.SetCurSel(0);
m_cRss2Combo.SetCurSel(0);
}

//posiziona i due combo box sul rss precedentemente salvato
if((m_cRss1Combo.FindStringExact(-1,pParentWnd->m_sRss1)) != -1)
m_cRss1Combo.SetCurSel(m_cRss1Combo.FindStringExact(-1,pParentWnd->m_sRss1));

if((m_cRss2Combo.FindStringExact(-1,pParentWnd->m_sRss2)) != -1)
m_cRss2Combo.SetCurSel(m_cRss2Combo.FindStringExact(-1,pParentWnd->m_sRss2));

UpdateString(pParentWnd->m_iVisualizationControl);

//free(*Temp);//giulio
free(Temp);

sorry but i'm a novice of c++...

thanks still...

Giulio

David Crow21-Mar-07 5:41

21-Mar-07 5:41

Ing.Raiz82 wrote:
i have problem here because strsepRss ask char ** stringp

So just use strtok().

Or, since you are using MFC, use a CString object, and AfxExtractSubString().

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

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

Ing.Raiz8221-Mar-07 6:12

Re: malloc / free [modified]

21-Mar-07 6:12

thanks you so much... now work...

sorry for the time...

thanks

Giulio

toxcct21-Mar-07 5:19

toxcct

21-Mar-07 5:19

1) you don't initialize the memory allocated
2) please use new[]/delete[] instead of malloc()/free()
3) prefer using containers such as std::vector if you need dynamic arrays (good for arrays of arrays too)
4) please also use <pre></pre> tags when posting code blocks

-- modified at 11:29 Wednesday 21st March, 2007

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Laxman Auti21-Mar-07 5:26

Laxman Auti

21-Mar-07 5:26

Ing.Raiz82 wrote:
but i don't understand....

Do you really required double pointer???
looking at code, I don't think so it is required.

You could use single pointer to do same job.

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Change font and colors in a listbox!

Laxman Auti21-Mar-07 5:18

Laxman Auti

21-Mar-07 5:18

Generally allocation of memory is from TOP-to-BOTTOM approch. and deallocation of memory is BOTTOM-to-TOP approch.

Allocate => parent -> child -> subchild.<br />
Deallocate => subchild -> child ->parent.

if you deallocate parent first, then it looses the reference to child and finally subchild also which will leads to memory leaks. Smile | :)

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

olssoninc21-Mar-07 4:45

olssoninc

21-Mar-07 4:45

Hello!
I have now try to find information about changing font and color on a specific item in a listbox without succeed.

I find a "turtorial" on http://www.codersource.net/mfc_clistbox_font.html witch is describing exactly how to make a function cald MyListbox whitch change the font and color of a item in a listbox.

The problem is... I dont have any ide how to use it? Is it anybody who can help me get this function working and I will be very happy!

How do a declare declare LPDRAWITEMSTRUCT?

Thank you all!

//Anders

Conversion from CString to const char *

ilgale21-Mar-07 4:08

ilgale

21-Mar-07 4:08

How can I convert the content of a CString object into
a "const char *" type in a VS2005 UNICODE MFC application?

In VS6 there were only CString class... now, in VS2005,
developing UNICODE projects, is still good to use CString
or is better use CStringW or CStringT ?

Thanks a lot !

Re: Conversion from CString to const char *

toxcct21-Mar-07 4:22

toxcct

21-Mar-07 4:22

use CString. it is a conveniant shortcut to either CStringA (ansi builds) or CStringW (unicode builds).

with this, always use _T() marco around your litteral strings.

and to convert from a CString object, use the LPCTSTR (or LPTSTR if constness is too much), mixed if needed with conversion macros such as T2W, T2A, CT2W, CT2A, etc... (Clikety[^])

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

The Simplest of Graphics

alimanishere21-Mar-07 3:35

21-Mar-07 3:35

Hi,

We need help to create a window and display three variables with big fonts. How do we do this, we don't need nothing complicated. Please help!

alex

ilgale21-Mar-07 4:14

ilgale

21-Mar-07 4:14

Take a look to this class, it offers a very usefull interface !

http://www.codeproject.com/staticctrl/clabel.asp[^]

alimanishere21-Mar-07 23:45

21-Mar-07 23:45

nice demo program but it is a bit complicated for us. we have only been programming c++ for three weeks and we need something simpler and easier to follow with a few commands/functions. thanks

David Crow21-Mar-07 4:39

21-Mar-07 4:39

Your problem can be broken down into at least three smaller problems:

1) Create a window
2) Display data
3) Use a font other than the default

Which part do you need help with? Are you using MFC?

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

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

alimanishere21-Mar-07 22:26

21-Mar-07 22:26

we would like to get help with 2)display data and 3)Use a font other than the default. And yes, we are using MFC.

thank you for taking your time.

David Crow22-Mar-07 2:48

22-Mar-07 2:48

alimanishere wrote:
we would like to get help with 2)display data...

In the OnPaint() handler, use TextOut().

alimanishere wrote:
3)Use a font other than the default.

Select a new font into the DC used by the OnPaint() handler.

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

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

alimanishere23-Mar-07 0:30

23-Mar-07 0:30

ok thanks..but how do you change the font size?

David Crow23-Mar-07 7:59