C / C++ / MFC

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 19:42

Suresh H wrote:
int F;
HWND HCBF = GetDlgItem(hwnd, IDC_CB);
SendMessage(HCBF , CB_GETITEMDATA,(WPARAM)F, 0);

Here , you have not initialized F.
Passing junk values as index. Pass index you want there.

CB_GETITEMDATA is not right message to send in this case, too.
You need to use CB_GETLBTEXT.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Suresh H16-Jan-07 19:49

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 19:49

Hi Prasad,

Thanks for the response.

Actually I want to extract the value of the Combo Box (user selected value)
In combo box we have values from 0,1,2,3 ---- so on when user selects some value fro list any number , I want to extract that number and I want to use that number in the program.
Can u please tell me what I have to do ??

Hamid_RT16-Jan-07 19:51

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 19:51

You must use of CB_GETCURSEL for get index to currently selected item instead use of 0

WhiteSky

prasad_som16-Jan-07 19:58

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 19:58

This code should suffice,

int nIndx =::SendMessage(hCombo,CB_GETCURSEL,0,0);
TCHAR buff[100];
::SendMessage(h,CB_GETLBTEXT,(WPARAM)nIndx,(LPARAM)buff);
//buff will contain text returned

Prasad
Notifier using ATL | Operator new[],delete[][^]

Hamid_RT16-Jan-07 20:08

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:08

And he needs to a convert atoi Wink | ;)

WhiteSky

prasad_som16-Jan-07 20:10

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:10

WhiteSky wrote:
And he needs to a convert atoi

Why ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Hamid_RT16-Jan-07 20:16

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:16

If he wants to use of numeric values

WhiteSky

Suresh H16-Jan-07 20:20

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:20

Thanks WhiteSky for the Response, yr info is also very use full for me. I will keep a note of that.

Hamid_RT16-Jan-07 20:32

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:32

Thank you

WhiteSky

prasad_som16-Jan-07 20:21

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:21

Ok, you was refering to extracting numbers.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Hamid_RT16-Jan-07 20:30

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:30

And also one other thing if he wants to use CB_GETCURSEL(return values) for works on his programs(not for combobox)its not good idea because it returns -1,0,1,...but if he has values like 100,200,300 on his combobox... return values of CB_GETCURSEL not helpfuls Wink | ;)

WhiteSky

prasad_som16-Jan-07 20:35

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:35

WhiteSky wrote:
CB_GETCURSEL(return values) for works on his programs(not for combobox)

WhiteSky wrote:
its not good idea because it returns -1,0,1,...but if he has values like 100,200,300 on his combobox... return values of CB_GETCURSEL not helpfuls

I'm really not getting , what you are trying to say?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Hamid_RT16-Jan-07 20:42

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:42

I said its better he uses of value on combobox Wink | ;)

WhiteSky

prasad_som16-Jan-07 20:44

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:44

Haven't you seen this[^]?

Prasad
Notifier using ATL | Operator new[],delete[][^]

Suresh H16-Jan-07 20:14

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:14

Thanks Prasad Code is working.

Thanks for taking some time for me and helping me.

In yr code 1st line was enough for me

int nIndx =::SendMessage(hCombo,CB_GETCURSEL,0,0);

since in the combo box I have values from 0,1,2,3,4,5 and so on …
so as I get the Index number value will be the same as the CB content.
I did not know about the CB index. Thank you very much. Smile | :)

prasad_som16-Jan-07 20:23

Re: Getting the Combo Box selected item using Win32 API.

16-Jan-07 20:23

Suresh H wrote:
since in the combo box I have values from 0,1,2,3,4,5 and so on …
so as I get the Index number value will be the same as the CB content.

Seems very strange logic.
But, use CB_GETLBTEXT message, as it will not be the case always.

Prasad
Notifier using ATL | Operator new[],delete[][^]

Suresh H16-Jan-07 20:30

16-Jan-07 20:30

Yes Prasad I will make use of it.

Bad Style!

jhwurmbach16-Jan-07 22:33

jhwurmbach

16-Jan-07 22:33

For CB_GETLBTEXT, MSDn says:

lParam
Pointer to the buffer that receives the string. The buffer must have sufficient space for the string and a terminating null character.

With your 100 TCHARS you might or might not be ok.

MSDN gives the solution in the next sentence:

You can send a CB_GETLBTEXTLEN message prior to the CB_GETLBTEXT message to retrieve the length, in TCHARs, of the string.

So, the code-snippet would better be:

int nIndx =::SendMessage(hCombo,CB_GETCURSEL,0,0);
const LRESULT nSize = ::SendMessage(hCombo, CB_GETLBTEXTLEN, (WPARAM)nIndx, 0);
TCHAR buff[nSize+1];
::SendMessage(h,CB_GETLBTEXT,(WPARAM)nIndx,(LPARAM)buff);
//buff will contain text returned

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Re: Bad Style!

prasad_som17-Jan-07 1:47