Re: Running one function but different paths for a number of menu items - C / C++ / MFC Discussion Boards

Jeremy Falcon30-Jan-03 8:00

30-Jan-03 8:00

A timer continues until you either call KillTimer() or the thread terminates - take its message queue with it. If you don't need the timer; however, it's best to destroy it to save CPU cycles.

Jeremy Falcon
Imputek

Dynamic Change Between Single/Multi select i CListCtrl

Michael Olsen30-Jan-03 4:32

Michael Olsen

30-Jan-03 4:32

Hello all,

I have a problem with my app. i have a CListCtrl where i need to change between Multiple selected and single selected with a check box.

I have been looking through the articles but didnt find anything.

Can anyone help me please?

In advance thanks, Michael Olsen

Re: Dynamic Change Between Single/Multi select i CListCtrl

Navin30-Jan-03 4:53

Navin

30-Jan-03 4:53

I am assuming the CListCtrl is similar in this regard to the CListBox. If anyone knows of a good way to do this with CListCtrl, I want to know too.

But I do know you can't do it with a listbox. The Windows designers apparently never figured that someone might want to switch between single select and multiple select at run-time...

So your options are as follows:
Green Alien | [Alien]

Create *two* list controls, right on top of each other, one is a Multiselect, the other is a Single select. Show only the one you want at any given time. Whenever you change between Single and Multiple select, show the appropriate list, and synchronize the contents. The disadvantage is that functions that do something to the list control have to be smart enough to know which one to use... or you have to make a wrapper class around the list controls to handle it.

Green Alien | [Alien]

Create a custom control, or derive a new control from CListCtrl and do the rest of the functionality manually. Then post it on CP as an article. Big Grin | :-D

You can pick your friends, and you can pick your nose, but you can't pick your friend's nose.

Re: Dynamic Change Between Single/Multi select i CListCtrl

User 665830-Jan-03 5:44

User 6658

30-Jan-03 5:44

Try this, but I haven't tested it:

ModifyStyle(0, LVS_SINGLESEL); // disable multiple selections
ModifyStyle(LVS_SINGLESEL, 0); // enable multiple selections

regards

modified 12-Sep-18 21:01pm.

Running one function but different paths for a number of menu items

ns30-Jan-03 4:27

30-Jan-03 4:27

Is this the way to get one handler to run but have different code executed depending on the menu item clicked? Is there some other technique?

In the OnMYMenu() handler, I did:

CString strA, strB, strC;
CString str1 = "A";

CString str2 = "B";

CString str3 = "C";

mmenu->GetMenuString(ID_PALETTEA, strA, MF_BYCOMMAND);

mmenu->GetMenuString(ID_PALETTEB, strB, MF_BYCOMMAND);

mmenu->GetMenuString(ID_PALETTEC, strC, MF_BYCOMMAND);

if(strA == str1)
{
       dostuff();
    }

if(strB == str2)
{

     m_palette.bitCount = 0;

}  etc

Thanks

Appreciate your help,
ns

Re: Running one function but different paths for a number of menu items

HENDRIK R30-Jan-03 4:47

HENDRIK R

30-Jan-03 4:47

Perhaps you should have a look at ON_COMMAND_RANGE for your message map. It's the "normal";) way to get the same function called for different menu items.

Re: Running one function but different paths for a number of menu items

ns30-Jan-03 5:04

30-Jan-03 5:04

I'm on it.......it looks really cool! Now I'm trying to code it, but I do have a sample so I'm fairly certain I can do it. Many many thanks.....this was precisely what I needed.

BTW, whats your suggestion on getting dynamic menu items to run a function (no ID range is set since the number is not known at all .....) - cant use ON_RANGE for that....I tried doing win2Ks WM_MENUCOMMAND but no luck. Do you have any suggestions?

Appreciate your help,
ns

Re: Running one function but different paths for a number of menu items

HENDRIK R30-Jan-03 5:12

HENDRIK R

30-Jan-03 5:12

ns wrote:
BTW, whats your suggestion on getting dynamic menu items to run a function (no ID range is set since the number is not known at all .....) - cant use ON_RANGE for that....I tried doing win2Ks WM_MENUCOMMAND but no luck. Do you have any suggestions?

I'm not sure whether it really works (because never needed it) but I think overwriting CWnd's OnCommand could work.

Re: Running one function but different paths for a number of menu items

ns30-Jan-03 6:02

30-Jan-03 6:02

Question: Do you think the compiler etc can handle it if I set aside say 500 IDs ?

Can I do this: in resource.h

#define ID_START 5000
#define ID_END 5500

Then as I go through doing AppendMenu

for (int i = ID_START; i < ID_END; i++)
{
     psubMenu->AppendMenu(MF_STRING, i, tempSub);

}

Then I could use the On_COMMAND_RANGE....

Appreciate your help,
ns

Re: Running one function but different paths for a number of menu items

HENDRIK R30-Jan-03 21:24

HENDRIK R

30-Jan-03 21:24

Uhm ... I must admit I never thought of such a solution. but as I see it, it could work, provided that there's no other ID defined between 5000 and 5500. Give it a try and you'll know whether it's practical or not.;)

Cannot open include file: 'iphlpapi.h'

Anonymous30-Jan-03 4:16

Anonymous

30-Jan-03 4:16

I want to use 'iphlpapi.h' (I want to be able to use GetAdaptersInfo) in a MFC application, but I get this message:
Cannot open include file: 'iphlpapi.h'

What can I do?

Thanks

-- n

Re: Cannot open include file: 'iphlpapi.h'

Andreas Saurwein30-Jan-03 4:47

Andreas Saurwein

30-Jan-03 4:47

install the platform SDK (see msdn.microsoft.com/sdk[^])

Holy Sh*t! I'm speechless. (hey, that's a first) Marc Clifton, The Lounge

Re: Cannot open include file: 'iphlpapi.h'

Anonymous30-Jan-03 21:28

Anonymous

30-Jan-03 21:28

Thanks, I just realized after posting this question.

Sorry!

Thanks a lot.

-- n

Re: Cannot open include file: 'iphlpapi.h'

Anonymous30-Jan-03 21:47

Anonymous

30-Jan-03 21:47

Yes, I just installed the SDK.
But I get this error:
c:\program files\microsoft visual studio\vc98\include\iphlpapi.h(183) : error C2065: 'PMIB_ICMP_EX' : undeclared identifier

Any ideas.

Thanks

Re: Cannot open include file: 'iphlpapi.h'

naradaji31-Jan-03 3:22

naradaji

31-Jan-03 3:22

It's solved including the right directories in tools / options / directories.

Thanks

CbitmapButton work as a checkbox ?

Maximilien30-Jan-03 4:13

Maximilien

30-Jan-03 4:13

Is it possible to do it ?

I created a CButton in a dialog, and made it a CBitmapButton :

// myDialog.h
  CBitmapButton myButton;
...

// myDialog.cpp
  DDX_Control(pDX, IDC_OPTION_PANEL_CHECKBOX, m_myButton);
...
BOOL myDialog::OnInitDialog() 
{
 CDialog::OnInitDialog();
 myButton.SetButtonStyle( BS_AUTOCHECKBOX  ); // also tried BS_CHECKBOX 
 myButton.LoadBitmaps(IDB_SHOW_HIDE_OPTION_PANEL_UP,IDB_SHOW_HIDE_OPTION_PANEL_DOWN );
 myButton.SizeToContent();
...
}

If I do SetButtonStyle( BS_AUTOCHECKBOX ) I loose the bitmaps and the button becomes a simple checkbox button.

Did I miss the obvious ?

Thanks.

Max.

SysListView32

shivpal30-Jan-03 3:32

shivpal

30-Jan-03 3:32

Hi,

I want to use this control in my win32 program (not mfc) through rc file.
When I use this control, the dialog box is not displaying.
Can anybody help please?

RC file excerpts:
CONTROL "",IDC_LIST1,"SysListView32",LVS_ALIGNLEFT | WS_BORDER |
WS_TABSTOP,81,10,60,50
Thanks in advance.

Regards,
Shivpal

Did you forget to initialize common controls?

30-Jan-03 3:45

void InitCommonControls(VOID);

Re: Did you forget to initialize common controls?

shivpal30-Jan-03 3:59

shivpal

30-Jan-03 3:59

Yes. I did it and its working now Smile | :)

Thanks a lot
Shivpal

Destructor question, STL map

ns30-Jan-03 3:13

30-Jan-03 3:13

WHy is this happening?

I have:

CImage & ImageRemus = m_PaletteMap[m_PalRemus];

If I put a breakpoint at this line and step in ,it crashes if I try to advance to next line of code (step over).

But if I put a breakpoint in the destructor of my CImage class, and say run to next breakpoint from this first breakpoint, it steps into the destructor!!!! (It crashes there).

Question is why is it stepping into the destructor?

Appreciate your help,
ns

Re: Destructor question, STL map

AlexO30-Jan-03 3:36

AlexO

30-Jan-03 3:36

There is not enough information, so I am going to guess.
1. member at position m_PalRemus does not exist.
2. CImage default constructor does not initialize object properly OR you did not overwrite copy constructor.

Could you show the whole function and exact declaration of the map. The declaration of CImage would help too.

Resolved, thanks

ns30-Jan-03 4:02

30-Jan-03 4:02

Hi Alex,

I stil dont know why it went into the destructor. But I found out that I hadnt initialized a member in the constructor, so it was pointing to some invalid address. Then in the destructor I was having it delete that pointer if it existed. It did exist because it wasnt initialized and then it tried to delete it. The big mystery is --- why did it even go into the destructor in the first place? After i fixed the error (omission), and put breakpoints in the destructor, the program never did venture into the destructor .....puzzled. Confused | :confused:

Appreciate your help,
ns

Re: Resolved, thanks

AlexO30-Jan-03 4:30

AlexO

30-Jan-03 4:30

Here is simplified explanation
std::map<key, type=""> operator[]:
1. check if member at Key position exist (same as calling map::find(Key))
2. if does not exist create new value
a. Create temporary object of Type (call to Type::Type() constructor)
b. Copy the temporary obect to the position [Key](call to Type::Type(const Type &) constructor)
c. Destroy temporary obect(call to Type::~Type())
3. Return Type& to the element at Key position

Thanks!!

ns30-Jan-03 4:40

30-Jan-03 4:40

Thats really clarified the process to me. Thank you so much....now it makes perfect sense!! Smile | :)

Appreciate your help,
ns

Re: Destructor question, STL map

Zdeslav Vojkovic30-Jan-03 4:02

Zdeslav Vojkovic

30-Jan-03 4:02

the definition of std::map<>::operator[] says it returns value of insert(value_type(key, T())).
this value_type(key, T()) creates temporary T object (CImage in your case) using default constructor. This temp object is destroyed when operator[] exits, therefore the destructor is called.

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