Multiple Dialog - C / C++ / MFC Discussion Boards

cmk4-Sep-04 11:46

4-Sep-04 11:46

*(*pNode)[7] is the same as :
Node* (*pNode)[7];
And reads as : a pointer to an array of 7 Node pointers.
Two pointers, two things need to be allocated.

1.
*(*pNode)[7] you have two * and an index [7]
*(*(*pNode)+i) you have three * and an index i
These don't match.

Instead use either :
*((*pNode)+i) = NULL;
or,
(*pNode)[i] = NULL;

2. for( ...
Before you can initialize pNode you have to allocate it. Remember pNode is a 'pointer ...'.
i.e.
pNode = (Node*(*)[7])calloc(7, sizeof(Node*));
Also, by using calloc you don't need to loop to initialize.

3. **pNode = new Node;
What are you trying to do ? pNode is a pointer to an array. Here you only ever access first element.
You likely want to use syntax from 1. i.e. (*pNode)[i] = new Node;

Might be able to help more if you explain the context of its use.

...cmk

Save the whales - collect the whole set

Re: C++ question.

WREY4-Sep-04 12:20

WREY

4-Sep-04 12:20

Thanks for responding. I appreciate it.

Yes, you are very correct that by my doing the following:

**pNode = new Node;

I am only accessing the first of 7 Nodes. But then notice the next statement:

(**pNode)->Lvl = 1;

in which I start filling in data to that first node (which happens to be my root node). Later on, through the use of the "for" statement I begin to fill in the rest of the array this way (as an example):

for(short i=1; i<limit; ++i)
for(short j=0; j<7; ++j)
{
(*(*pNode+i)+j)->Lvl = *(lvlData+j);
(*(*pNode+i)+j)->lvlNode = *(nodeData+j);
... etc.
}

=============================

Inside the Node structure, there is still a third array to which I assign data this way:

*((*(*pNode+i)+j)->nodesUp+k) = *(nodeCnt+k);

=============================

It was the initial allocating of memory to the "j" level of the array that was holding me back.

Thanks for the help. I appreciate it.

Smile | :)

William

Fortes in fide et opere!

Re: C++ question.

WREY5-Sep-04 3:11

WREY

5-Sep-04 3:11

If you will kindly indulge me one more time, I forgot to mentioned that I'm using:

free(pNode);

to deallocate the memory. Is that OK, or should I do a 'delete' on the individual Nodes I dynamically created, BEFORE doing the 'free(pNode)'?

Thanks. I appreciate the use of your valuable time.

Smile | :)

William

Fortes in fide et opere!

Re: C++ question.

tomerab5-Sep-04 4:36

tomerab

5-Sep-04 4:36

Hi,
1.) struct Node
{
// various types
} *(*pNode)[7];

this is not a ptr to a 2-dimensional array. This is an array of ptr to ptr.
To make it clearer you can rewrite it:
typedef Node **PtrPtrNode;
PtrPtrNode ppNode[7];

2.) initilalize it as follows:
for (int i = 0; i < 7; i++)
{
pNode[i] = new (Node*);
*(pNode[i]) = new Node[5];
}

3.) filling a node is done as follows:
Node* pNodeArray = NULL;
for (int i = 0; i < 7; i++)
{
pNodeArray = *(pNode[i]);
for (int j = 0; j < 5; j++)
{
pNodeArray[j].Lvl = 0;
}
}

4) releasing:
for (int i = 0; i < 7; i++)
{
delete [](*(pNode[i]));
delete pNode[i];
}
}

I didn't compile it but I hope it's 'error free'
Regards, Tomer

Re: C++ question.

WREY5-Sep-04 6:02

WREY

5-Sep-04 6:02

Confer Lippman's "C++ Primer", page 414 (about 3/4 down the page) under Section 8.4.3, and see his example of a two dimensional array of which I similarly used.

I can quote you my references, quote me yours.

William

Fortes in fide et opere!

Re: C++ question.

tomerab5-Sep-04 19:31

tomerab

5-Sep-04 19:31

Sorry,
I was wrong Frown | :(

you were right Smile | :)

I was confused between *(*pNode)[7] and **pNode[7] which are two different things.

TreeView set check with InsertItem

LukeV4-Sep-04 7:00

LukeV

4-Sep-04 7:00

Hi,

is there a way to check an item when using InsertItem()? I'm trying to use SetCheck after InsertItem but it won't work!

How can I do that?

Thanks!

Multiple Dialog

Grahamfff4-Sep-04 5:59

Grahamfff

4-Sep-04 5:59

I have an MFC dialog based application containing several modeless dialogs.

A user has asked that one of the dialogs be multiple; i.e. the particular dialog displays data from an internal database and wants up to 5 instances of this dialog display showing various filtered views on he database.

So my question as I have all the code for managing the display dialog, can this dialog be made into an dialog array. Or are they another way extra instances of this dialog can be created.

Any suggestions for this unforeseen problem.

grahamfff

Re: Multiple Dialog

Anonymous4-Sep-04 8:10

Anonymous

4-Sep-04 8:10

That is the beauty of a class. All it's data objects are self contained. So, provided it is a modeless dialog, you can create as many instances of it as you like. And yes, you can do it from an array if you want too.

Re: Multiple Dialog

Grahamfff5-Sep-04 8:48

Grahamfff

5-Sep-04 8:48

Thanks for your post.

Just one question I can't see how to do an array of Modeless dialogs.

ANy help appreciated.

grahamfff

UNICODE problem.

Irek Zielinski4-Sep-04 5:43

Irek Zielinski

4-Sep-04 5:43

Hi to all

Recently I decided to move my application to UNICODE. All is near done (it complies and works (most of the time)) but I found a strange problem.

When I have some unicode string in for example WCHAR szTest[100] table - calling AfxMessageBox or SetWindowText on dialogs - displays unicode strings correctly.

But if I try to SetWindowText the same string into static control (or button) it shows a garbage text. Spy++ utility reports that those static controls and buttons are Unicode windows.

Any idea why it works this way?
Thanks for your time!
Irek

Check out my software at: http://www.ireksoftware.com

Re: UNICODE problem.

Michael Dunn5-Sep-04 6:14

Michael Dunn

5-Sep-04 6:14

If you're using VC 6, you need to manually edit the .rc file and change the dialogs to use MS Shell Dlg as the font instead of MS Sans Serif.

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
Laugh it up, fuzzball.
"That probably would've sounded more commanding if I wasn't wearing my yummy sushi pajamas."
-- Buffy

Re: UNICODE problem.

Irek Zielinski5-Sep-04 10:27

Irek Zielinski

5-Sep-04 10:27

Thanks Michael - that solved the problem. I wonder why it's not mentioned even a single time in MSDN...

Very best regards!
Irek

Check out my software at: http://www.ireksoftware.com

CDC GetWindowExt WinXP->Win98

FriendOfAsherah4-Sep-04 3:47

FriendOfAsherah

4-Sep-04 3:47

Hi GURUS
Ive transfered a program from WinXP back to Win98 (VC++6,MFC)
Trying to print on the same printer I get following problem:
Code:
m_PrintDC.SetMapMode( MM_HIMETRIC );
CSize winsize = m_PrintDC.GetWindowExt();

In WinXP I get the correct size of the window in HiMetric
(about 20100x27000) but in Win98 I always get 2450 x 2450 !!
I also cannot change (SetWindowExt, SetViewportExt ) to anything.
Calling m_PrinterDC.GetMapMode() results in MM_HIMETRIC !
The GetDeviceCaps(HORZSIZE)... works fine !.
But calling LineTo() with values in the range of the devicecaps is outside WindowExt/Org so it doesnt work -
Where does this difference come from ? Is there any default in XP which I have to Set for Windows 98. (another mapping mode ?)..
pls help, -> thx !

opening a wav file in programming visual c++

sysrye4-Sep-04 3:26

sysrye

4-Sep-04 3:26

i want to open a wav file and get the file from my drive c harddisk. what commands should be used to get the wav file??Thanks i really badly needed the commands.Thanksss!!!Help me out Smile | :)

Re: opening a wav file in programming visual c++

Joel Holdsworth4-Sep-04 5:34

Joel Holdsworth

4-Sep-04 5:34

http://www.wotsit.org/search.asp?page=8&s=music[^] <- This site should give you some help with that. It should give you the format of the data to read. Be careful when loading the sound data, as it could take up a lot of memory.

Joel Holdsworth

Re: opening a wav file in programming visual c++

Anonymous4-Sep-04 14:29

Anonymous

4-Sep-04 14:29

thanks a lot man!!! Smile | :)

Mapping COM port ????

zahid_ash4-Sep-04 2:38

zahid_ash

4-Sep-04 2:38

HI ,

I know the IP adress of other System. and it COM port name COM1.

I want to mapp it virtualy on my system.

How can i do it.
any sample

thanx

Regards.

About Windows Services

zahid_ash4-Sep-04 2:34

zahid_ash

4-Sep-04 2:34

HI,

As i know we can write Windows services for Windows 2000 and Windows XP .

Can we write them for Windows 98.
if yes , is it done in same way as for 2000 and XP.

or any change

thanx

Regards.

Simple PNG loading...

Joel Holdsworth4-Sep-04 2:17

Joel Holdsworth

4-Sep-04 2:17

I need a really Easy, Compatible and preferably Lightweight way to load PNG files to a DIB. I also need the alpha channel to be read correctly. So far I've looked at CxImage (rather heavyweight, and discontinued by David Pizzolero), libpng (very difficult to compile or link in MSVC7) and http://www.codeproject.com/bitmap/graphicsuite.asp[^] (but this requires a recent version of IE). Does anyone have any suggestions?

Joel Holdsworth

Re: Simple PNG loading...

C^hris L^osinger4-Sep-04 13:18

C^hris L^osinger

4-Sep-04 13:18

if you'll allow me a blatant advertisement, i can recommend my company's own library, ImgSource. it does tons more than just loading PNGs, but the linker will ensure that only the parts you use will get used, so you won't get penalized if you don't use it all. PNG support should add about 100K to your app.

here's a sample:

<br />
// three lines to get a PNG into a DIB<br />
HISSRC hSrc = IS3OpenFileSource(filename);<br />
HGLOBAL hDIB = IS3ReadImageToDIB(hSrc,...);<br />
IS3CloseSource(hSrc);<br />
<br />
BITMAPINFOHEADER *pDIB = (BITMAPINFOHEADER *)hDIB;<br />
<br />
...<br />
<br />
// delete it when you're done.<br />
GlobalFree(hDIB);<br />

-c

Software | Cleek

Re: Simple PNG loading...

Joel Holdsworth5-Sep-04 3:52

Joel Holdsworth

5-Sep-04 3:52

Wow thanks! That could well be my solution Smile | :)

Joel Holdsworth

visual c++, pocket pc, xml and Python

ajaybrar4-Sep-04 1:06

ajaybrar

4-Sep-04 1:06

has anyone done work in this direction?
you can call c/c++ code from python and there is a version of python for pocket pc.
and i have written a few simple dll's that work from python on pocket pc
the problem is in xml processing - i tried the code at http://www.codeproject.com/soap/ce_xml.asp but as soon as i put the Python wrappers around it and point to the Python include files, i get errors
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5395) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'const unsigned short *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5396) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [4]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5404) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [100]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5413) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [12]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5414) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [100]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5417) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short *' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5420) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [10]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
C:\Windows CE Tools\wce300\Pocket PC 2002\atl\include\atlbase.h(5421) : error C2664: '__WinCE_OutputDebugStringA' : cannot convert parameter 1 from 'unsigned short [2]' to 'const char *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
stl_eVC\wce_defs.h(47) : warning C4005: 'assert' : macro redefinition
C:\hons\pocketpc\python_ce_build\Python-2.3.4\PC\WinCE\assert.h(7) : see previous definition of 'assert'

any ideas why or how to get around it.

cheers

Re: visual c++, pocket pc, xml and Python

Gary R. Wheeler4-Sep-04 2:30

Gary R. Wheeler

4-Sep-04 2:30

It looks like you need to set things to compile for UNICODE rather than ANSI.

Software Zen: delete this;

Re: visual c++, pocket pc, xml and Python

ajaybrar4-Sep-04 2:42

ajaybrar

4-Sep-04 2:42

umm and how do i set that?

thanks

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