Re: Associative Arrays? - C / C++ / MFC Discussion Boards

Jon Hulatt22-Mar-02 1:09

22-Mar-02 1:09

Hi,

I want to implement an object that can look up a string in a table and return an integer based on that string. Is there a nice MFC class to do this for me?

jon

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Associative Arrays?

Tomasz Sowinski22-Mar-02 1:21

Tomasz Sowinski

22-Mar-02 1:21

If you insist on MFC, use CMapStringToPtr. Pointers are just integers.

You may also consider std::map.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Associative Arrays?

Jon Hulatt22-Mar-02 2:58

Jon Hulatt

22-Mar-02 2:58

tsk. Tomasz, you just made me use STL for the first time. I lost my STL virginity.

I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!

FYI, so you can rip it to pieces (and I know you're gonna hate the CString):

std::map<CString,int> l;
map <CString, int> :: const_iterator matching_item;

l.insert( map <CString, int> :: value_type ( CString("bob"), 20 ));
l.insert( map <CString, int> :: value_type ( CString("alf"), 23 ));
l.insert( map <CString, int> :: value_type ( CString("fred"), 19 ));
l.insert( map <CString, int> :: value_type ( CString("steve"), 12 ));
l.insert( map <CString, int> :: value_type ( CString("stu"), 45 ));
l.insert( map <CString, int> :: value_type ( CString("jon"), 2 ));
l.insert( map <CString, int> :: value_type ( CString("jim"), 543 ));

matching_item  = l.find ( CString("jon"));
int d = matching_item->second;

thanks for your help!

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Associative Arrays?

Jon Hulatt22-Mar-02 2:59

Jon Hulatt

22-Mar-02 2:59

Am i right in thinking that I can use any of my own defined classes in STL? provided I include things like comparison operators, etc etc ??

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Associative Arrays?

Tomasz Sowinski22-Mar-02 3:00

Tomasz Sowinski

22-Mar-02 3:00

Yes. AFAIR, std::map requires only operator < - it's actually a tree, while MFC maps are hashtables.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Associative Arrays?

Tomasz Sowinski22-Mar-02 3:04

Tomasz Sowinski

22-Mar-02 3:04

Jon Hulatt wrote:
know you're gonna hate the CString

I'm not going to hate CString. If something works, let it work Smile | :)

Just FYI, STL has the std::string class.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Associative Arrays?

Jon Hulatt22-Mar-02 3:32

Jon Hulatt

22-Mar-02 3:32

Tomasz Sowinski wrote:
Just FYI, STL has the std::string class

This much I know. But the app is heavily MFC right now; CFile, CStdioFile, CAsyncSocket, etc etc.

What i'm using the map for is to turn mime-type strings into default file extensions. I'm now using a <CString,CString>> pair for the map, the first is the type (eg. CString("application/x-msword")) and the second is the default file extension (eg. CString("doc")). My source data, which ultimately came from a Socket, is currently in a big char buffer. But I can't see that std::map<LPCSTR,LPSTR> would do what i wanted, because two pointers to "application/x-msword" point to the same data, but probably in different places, so the internal comparisons won't work.

Really, I probably should never have used char buffers. But I understand them, whereas this STL thing is new to me (i've avoided it for as long as possible!!!). So, in the short term for this project, since it's use of MFC already means it runs like a lubricated turd, I might as well just make life easier by creating a CString out of my LPCSTR.

Smile | :)

thanks again

Sorry to dissapoint you all with my lack of a witty or poignant signature.

Re: Associative Arrays?

Christian Graus22-Mar-02 10:29

Christian Graus

22-Mar-02 10:29

Jon Hulatt wrote:
I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!

I think I found my new sig.

I'll just mention that it's easier to insert into a map like this:

l[CString("bob")] = 20;
l[CString("alf")] = 23;

You can also extract like this, but the downside is if the item you try to extract does not exist, it will be created, so you need to do this:

if (l.end() != l.find(Cstring("bob")))
assert(20 == l[CString("bob")]);

You've inspired me, I'll finally pull it together and write my set/map article today.

P.S. when you post STL code or anything else that uses templates, don't forget to turn off HTML in the post, so all the code is posted.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm thinking of getting married for companionship and so I have someone to cook and clean." - Martin Marvinski, 6/3/2002

Confused by WM_SIZING

Hans Ruck22-Mar-02 1:02

Hans Ruck

22-Mar-02 1:02

Could anyone give some indication about interpreting the nSide parameter of OnSizing (WM_SIZING) in a MFC application?
It looks like taking random values.

rechi

Re: Confused by WM_SIZING

Tomasz Sowinski22-Mar-02 1:37

Tomasz Sowinski

22-Mar-02 1:37

Works as advertised on my machine. Are you getting values other than WMSZ_xxx flags?

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Confused by WM_SIZING

Hans Ruck22-Mar-02 1:45

Hans Ruck

22-Mar-02 1:45

I get WMSZ_xxx flags in strange combinations.
For example, i use top-right corner to resize and i get WMSZ_BOTTOMLEFT activated. It doesn't have any sense for me.

rechi

Re: Confused by WM_SIZING

Tomasz Sowinski22-Mar-02 1:54

Tomasz Sowinski

22-Mar-02 1:54

Strange. I can't reproduce it here. Did you override WM_NCHITTEST?

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Confused by WM_SIZING

Hans Ruck22-Mar-02 1:51

Hans Ruck

22-Mar-02 1:51

I didn't do anything but writing OnSizing for a dialog window.

rechi

Re: Confused by WM_SIZING

Tomasz Sowinski22-Mar-02 2:01

Tomasz Sowinski

22-Mar-02 2:01

I'm tested this with dialog - and everything works OK. Are you using some 3rd party resizable dialog class?

BTW: you don't have your monitor rotated 180 degrees, do you? Smile | :)

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Confused by WM_SIZING

Hans Ruck22-Mar-02 2:02

Hans Ruck

22-Mar-02 2:02

It's an ordinary resizing dialog.
The combinations are so confusing that it shouldn't work even if i would rotate the TV 180 degrees. Eek! | :eek:

rechi

Re: Confused by WM_SIZING

Tomasz Sowinski22-Mar-02 2:39

Tomasz Sowinski

22-Mar-02 2:39

What do you mean by 'combinations'? WMSZ_xxx are not bit flags - they're just numbers from 1..8 range. If you're using bitwise operators for testing, you may get strange results.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Confused by WM_SIZING

Hans Ruck22-Mar-02 3:00

Hans Ruck

22-Mar-02 3:00

Now it's clear; i've been using them as bit flags.
Thanks!

rechi

encyption demo

22-Mar-02 1:01

beginner
hi im trying to get this code to work, so it would create a table with the alphabet and then allow me to access it using a cipher technique called vigenere. most of the code below is a mess and i cant make sense of it
any help would be appreciated

//fill- create a table 26 by 26 with the alpabet in each row
for (row= 0; row<=25; row++)
{
for (col=0; col=25 =; col++)
{
ch++; ch> 'z'; ch = 'a';
}
}
// access

m_typed = table[row][key]

Confused | :confused:

Changing color of item in list control

Ganesh Ramaswamy22-Mar-02 1:00

Ganesh Ramaswamy

22-Mar-02 1:00

I have to change the color if a item on list control, once the user does a double click on it. I have handled the double click and i have the item and subitem details. How can i go abt after this to chage the color of that item

Ganesh M Ramaswamy

Re: Changing color of item in list control

Tomasz Sowinski22-Mar-02 1:23

Tomasz Sowinski

22-Mar-02 1:23

If you want items to have different colors, you'll need to custom-draw the list control. There should be articles about that right here on CodeProject - look in the 'List Control' section.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Changing color of item in list control

Ganesh Ramaswamy22-Mar-02 2:44

Ganesh Ramaswamy

22-Mar-02 2:44

Yeah.But the thing is i am not getting a WM_CUSTOMDRAW when double click is made on list control. Am i missing something. Should i get WM_CUSTOMDRAW for double click on item also. thanks for ur time.

Re: Changing color of item in list control

Tomasz Sowinski22-Mar-02 2:42

Tomasz Sowinski

22-Mar-02 2:42

Try to invalidate item rectangle. You can get it from CListCtrl::GetItemRect.

Tomasz Sowinski -- http://www.shooltz.com
** If you're going to rape, pillage and burn, be sure to do things in that order. **

Re: Changing color of item in list control

Michael Dunn22-Mar-02 4:59

Michael Dunn

22-Mar-02 4:59

Use ListView_RedrawItems() to redraw any item you want.

--Mike--
Rollin' in my 5.0
With the rag-top down so my hair can blow.
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
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ATL question ???

jancsi22-Mar-02 0:27

jancsi

22-Mar-02 0:27

Hi!
I made an ATL composite control with ATL wizzard .
I want to place my custom draw slider on it . In the slider class it is defined

BEGIN_MESSAGE_MAP(CClipSlider, CSliderCtrl)
...
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomdraw)

It seems that the parent ATL control does not reflect the message NM_CUSTOMDRAW

How Can I make this to work???or other way to have my custom draw slider??
Thankx Cry | :((

xxx

Re: ATL question ???

Tim Smith22-Mar-02 3:33

Tim Smith

22-Mar-02 3:33

REFLECT_NOTIFICATIONS needs to be in your parent window class and REFLECTED_NOTIFY_CODE_HANDLER needs to be in your child window class.

ON_NOTIFY_REFLECT is from MFC.

Tim Smith

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