C / C++ / MFC

4-Jul-05 21:10

Why doesn't SetActivePage() work? It is what I call from the propertysheet's OnInitDialog() function and it works fine for me. I just make sure it is the last thing called in OnInitDialog() before it returns.

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using CMap

laiju4-Jul-05 18:34

laiju

4-Jul-05 18:34

I have declared the following in my application.
CMap<cstring,lpcstr,cwnd*,cwnd*> m_map;
I have a windows explorer like setup.
When i click a node in the tree i need to display an MDI Window.
So i have mapped the node item's text (LPCSTR) to that of the window pointer .So when i click a node i use CMap to get the window pointer and display the window.
Now when i alternatively click the windows i get the window pointer and i want to correspondingly shift the focus on the tree items.
So my question is how do i look up the key ( i.e LPCSTR) when i have the value (i.e.. CWnd*).

laiju

laiju4-Jul-05 18:42

laiju

4-Jul-05 18:42

I have declared the following in my application.
"CMap < CString,LPCSTR,CWnd*,CWnd* > m_map"
I have a windows explorer like setup.
When i click a node in the tree i need to display an MDI Window.
So i have mapped the node item's text (LPCSTR) to that of the window pointer .So when i click a node i use CMap to get the window pointer and display the window.
Now when i alternatively click the windows i get the window pointer and i want to correspondingly shift the focus on the tree items.
So my question is how do i look up the key ( i.e LPCSTR) when i have the value (i.e.. CWnd*).
.

laiju

Christian Graus4-Jul-05 19:13

4-Jul-05 19:13

Is there any reason you're using CMap instead of map, in the C++ standard library ? CMap, CList, CArray,etc. were all written only as a stopgap until the stl came online. They are really crappy in comparison.

You need to build a second map that goes the other way. Even if you iterate through the keys collection, checking for the value ( which is a very lousy thing to have to do ), there's no guarentee that your value appears only once, so there's no guarentee you'll find the right key.

Christian Graus - Microsoft MVP - C++

Ravi Bhavnani4-Jul-05 19:15

4-Jul-05 19:15

You'll need to iterate through all keys and check if each key's value matches the CWnd* you're searching for.

/ravi

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Christian Graus4-Jul-05 19:20

4-Jul-05 19:20

But that only works if each CWnd is only in there once. And it's damn ugly.

Christian Graus - Microsoft MVP - C++

Ravi Bhavnani4-Jul-05 19:26

4-Jul-05 19:26

True. What he really needs is a multimap.

/ravi

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Christian Graus4-Jul-05 19:33

4-Jul-05 19:33

Does multimap let you search the values ?

Christian Graus - Microsoft MVP - C++

Ravi Bhavnani4-Jul-05 19:37

4-Jul-05 19:37

Sorry, I meant a bi-directional map, not a multi-map. Blush | :O

/ravi

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PJ Arends4-Jul-05 21:39

4-Jul-05 21:39

I have used map and multimap, and read about but never used hash_map and hash_multimap. What exactly do you mean by a bi-directional map? I always thought bi-directional containers were containers that had both forward and reverse iterators, but that definition does not seem to be what is being discussed here. What I think you mean is a map where both the key and value are unique, and has a find() member that can find either the key or the value. Is there such a beast? If so what is it called and where can I get it?

Currently I am just using a map for this functionality, I check to make sure the value is unique before I add a new value to the map, and I sequentially iterate the map, comparing values, until I find the ~~key~~value I am looking for. If there is a better implementation out there I would be interested in learning about it.

Ravi Bhavnani5-Jul-05 4:59

5-Jul-05 4:59

PJ Arends wrote:
What I think you mean is a map where both the key and value are unique, and has a find() member that can find either the key or the value.
Yes, exactly.

PJ Arends wrote:
If so what is it called and where can I get it?
I don't know. I'm tempted to write one, but I doubt I'll come up with anything revolutionary (i.e. very efficient). A hashmap of pairs, with uniqueness enforced on values is what comes to mind.

/ravi

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PJ Arends5-Jul-05 10:33

5-Jul-05 10:33

Thanks Ravi. I thought you were refering to an already existing implementation that I did not know about. I guess I have to stick to my home-brewed hack.

Joaquín M López Muñoz5-Jul-05 11:04

Joaquín M López Muñoz

5-Jul-05 11:04

An off-the-sheld bidirectional map is provided here[^]; unfortunately, it doesn't work with MSVC 7.1. For a more comprehensive solution, allow me to suggest you take a look at the Boost Multi-index Containers Library[^], which enables the construction of bidirectional maps and more.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!

PJ Arends5-Jul-05 11:17

5-Jul-05 11:17

Thanks Joaquín, your CP article looks interesting. I will DL the code and play with it to see if it fits my needs Smile | :)

Maximilien5-Jul-05 2:51

Maximilien

5-Jul-05 2:51

a tought ...

if the strings are unique, make a map that points to ( a pointer to ) a structure containing a CWnd and a HTREEITEM

when you create the CWnd, attach the structure to the CWnd ( as a member of the class )
when you create the Tree Item, attach the structure to the Item ( CTreeCtrl::SetItemData )

when you click on the window, you can find exactly which item to highlight; and when you click on the tree item you have the pointer to the CWnd.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Taskbar Application

zhaopi4-Jul-05 18:28

zhaopi

4-Jul-05 18:28

I want to build a background service application, which means when the user start the application, it will just show an icon in the task bar. And of course user can double click the icon to configure the service setting.

So the issue is how to put it into the task bar...

Re: Taskbar Application

Christian Graus4-Jul-05 18:30

4-Jul-05 18:30

It's a testament to how great this site is that when I do a google in response to people who ask questions that have obviously been answered a million times online before, the first[^] hit refers back to the Code Project.

Christian Graus - Microsoft MVP - C++

Re: Taskbar Application

zhaopi4-Jul-05 18:32

zhaopi

4-Jul-05 18:32

thanks so much,
sorry to repeat such an old question to bother...but anyway your link will make it easy for me to get to the right place~

^-^ Big Grin | :-D

Re: Taskbar Application

Christian Graus4-Jul-05 19:14

handling WM_MOUSEWHEEL between two views

4-Jul-05 19:14

It's no worry for me to answer you, it's more that to succeed as a developer, you need to do some research before asking questions Smile | :)

Christian Graus - Microsoft MVP - C++

retro_coder4-Jul-05 18:10

retro_coder

4-Jul-05 18:10

Hi,

Sorry for this crosspost from WTL message board but I didn't get an answer there.

In my main frame I have a splitter pane with two views. I want to scroll the appropriate window when the mouse hovers over it. What is the best way to do this?

I was thinking of handling the WM_MOUSEWHEEL message and checking if the cursor is within the bounds of the view's rectangle (using GetCursorPos() and GetWindowRect()) but I think it might cause other problems.

I also tried using WM_MOUSEHOVER and WM_MOUSELEAVE but I am not sure how to best implement them.

Is there another way?

Thanks in advance.

Re: handling WM_MOUSEWHEEL between two views

Christian Graus4-Jul-05 18:30