C / C++ / MFC

C^hris L^osinger13-Jun-02 4:26

C^hris L^osinger

13-Jun-02 4:26

the typical way of doing this is to put a pointer to a data structure in the item data value for each tree item. this "data structure" can be anything you want: a class, an array, a list, a vector, a simple structure, etc.. the trick is to make sure the things you are pointing to remain active as long as the tree is alive, because don't want pointers on the tree pointing at objects that aren't alive any more!.

so, in pseudo-code:

pObject = new SomeObject;
tree.SetItemData(treeItem, (DWORD)pObject);
...
...
...
then, when you have to use the tree's data:
DWORD dwData = tree.GetItemData(treeItem);
SomeObject *pObject = (SomeObject *)dwData;
pObject->DoSomething();

-c

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Steve L.13-Jun-02 5:07

Steve L.

13-Jun-02 5:07

That looks great, just one question. Would SomeObject be my list or array or whatever I use?

-Raffi

C^hris L^osinger13-Jun-02 5:40

C^hris L^osinger

13-Jun-02 5:40

yes, exactly.

-c

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Image Processing?

MightyThor15-Jul-02 9:25

MightyThor

15-Jul-02 9:25

Hi,

I have a question a bit similar to this one.
I have a tree control that contains different types of items. Since there are three kinds of classes, i cannot use a type casting. First, i need to find the type of the object.

I intend to use something like below :

DWORD selectedItem = (DWORD) m_treeMain.GetItemData(
m_treeMain.GetSelectedItem() );

if( selectedItem.IsKindOf( RUNTIME_CLASS( CBand ) )
// Pop appropriate menu

But i can't use "." operator with selectedItem.

How should i do it?

Thank you.

Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

C^hris L^osinger15-Jul-02 10:19

C^hris L^osinger

15-Jul-02 10:19

tough one...

i would derive all three objects from a common base class.

then cast selectedItem to a pointer to that base class, and try the IsKindOf on that.

-c

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redeemer13-Jun-02 2:50

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 2:50

Rama Krishna Vavilala13-Jun-02 3:06

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 3:06

You need #define _WIN32_IE 0x500

redeemer13-Jun-02 3:43

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 3:43

it says the same + a macro redefinition warning of _WIN32_IE

Rama Krishna Vavilala13-Jun-02 3:52

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 3:52

Defined it is stdafx.h replace any definition if it already exists

redeemer13-Jun-02 3:58

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 3:58

I'm not sure what you meant, but if i remember correctly, stdafx is used for MFC, and i'm not using MFC.

Rama Krishna Vavilala13-Jun-02 6:49

Re: Where is BIF_USENEWUI defined? MSDN says i can use it but VC says unknown identifier.

13-Jun-02 6:49

You should do this before including windows.h.

You can also change it in the project settings. In C/C++ -> Preprocessor -> Symbol Defines add _WIN32_IE = 0x500

James R. Twine13-Jun-02 18:02

James R. Twine

13-Jun-02 18:02

   Just a small FWI: stdafx.h is (usually) used as the header file that creates the pre-compiled header (PCH) file.  It has nothing to do with MFC.

   The reason it was mentioned to put the #define _WIN32_IE 0x500 (near the top) of the stdafx.h file was so that it was #defined before the inclusion of any win32 header files that might be looking for that symbol.

   Lastly, you may need to update your SDK files (Platform SDK) in order to get a header file that has the BIF_USENEWUI value in it.  The "stock" files you get in an VC++ 6.0 install will not have it.

   Peace!

-=- James.
"Some People Know How To Drive, Others Just Know How To Operate A Car."
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How do i get an the iItem property of an item in a ListView if i have it's lParam value?

redeemer13-Jun-02 1:40

Re: How do i get an the iItem property of an item in a ListView if i have it's lParam value?

13-Jun-02 1:40

I can't use ListView_GetItem cause it requires iItem to be filled...

13-Jun-02 1:53

Try to use ListView_FindItem.

int ListView_FindItem(HWND hwnd, int iStart, const LPLVFINDINFO plvfi);

typedef struct tagLVFINDINFO
{
UINT flags;
LPCTSTR psz;
LPARAM lParam;
POINT pt;
UINT vkDirection;
} LVFINDINFO, FAR* LPFINDINFO;

1. Initialize a LVFINDINFO structure with your lParam value and flags set to
LVFI_PARAM.
2. Then call ListView_FindIntem with iStart = -1.
3. Returned value is what you need to get all other properties.

Re: How do i get an the iItem property of an item in a ListView if i have it's lParam value?

redeemer13-Jun-02 2:01

Re: How do i get an the iItem property of an item in a ListView if i have it's lParam value?

13-Jun-02 2:01

Thanks man!

srinivas vaithianathan13-Jun-02 8:17

srinivas vaithianathan

13-Jun-02 8:17

if your lparam is a ptr to a data structure, may be you can store the hitem in it when you create your listview items

Add MFC support to ATL project

Hans Ruck13-Jun-02 0:52

Hans Ruck

13-Jun-02 0:52

Do you know how should i add MFC support to ATL project?
When i try to use #include <afxwin.h> in stdafx.h and i declare a CString in a method i get the following:

Linking...
mfcs42d.lib(dllmodul.obj) : error LNK2005: _DllMain@12 already defined in a.obj
mfcs42d.lib(dllmodul.obj) : warning LNK4006: _DllMain@12 already defined in a.obj; second definition ignored
   Creating library Debug/a.lib and object Debug/a.exp
LINK : warning LNK4098: defaultlib "MSVCRT" conflicts with use of other libs; use /NODEFAULTLIB:library
Debug/a.dll : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

I've defined _AFXDLL and _USRDLL in the project settings and still doesn't work.

rechi

Rama Krishna Vavilala13-Jun-02 1:02

13-Jun-02 1:02

Here is how you fix it

1. Add a CWinApp derived class add InitIntance and ExitInstance functions.

2. Define _AFXDLL, _USRDLL

3. Move code from DllMain to appropriate InitInstance or ExitInstance method

4. Remove DllMain

Build and it will compile Smile | :)

Nish Nishant13-Jun-02 1:23

Nish Nishant

13-Jun-02 1:23

Rama Krishna wrote:
1. Add a CWinApp derived class add InitIntance and ExitInstance functions.

2. Define _AFXDLL, _USRDLL

3. Move code from DllMain to appropriate InitInstance or ExitInstance method

4. Remove DllMain

Also set the linker option to link with MFC statically or dynamically

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Summer Love and Some more Cricket [New Win]

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Rama Krishna Vavilala13-Jun-02 1:17

13-Jun-02 1:17

Nish - Native CPian wrote:
Also set the linker option to link with MFC statically or dynamically

Defining _AFXDLL sets dynamic link.