Re: Not able to add Item in Combo Box - C / C++ / MFC Discussion Boards

Re: Not able to add Item in Combo Box

Nishad S29-Oct-07 1:49

Nishad S

29-Oct-07 1:49

I have tried it.
It is working fine... Frown | :(

What is the return value of the SendMessage?

- NS -

Re: Not able to add Item in Combo Box

GauranG Shah29-Oct-07 2:05

GauranG Shah

29-Oct-07 2:05

I am using this code in Modeless Dialog Box. Can it be the source of problem ? This is what I am getting.

lr=  SendMessage(hCombo,(UINT)CB_ADDSTRING,(WPARAM)0,(LPARAM)ValueName); //lr ==0
  dError = GetLastError();  // dError == 1460
 lr=  SendMessage(hCombo,(UINT)CB_ADDSTRING,(WPARAM)0,(LPARAM)ValueName); // l2 == 0
dError = GetLastError();  // dError == 1460
 lr=  SendMessage(hCombo,(UINT)CB_ADDSTRING,(WPARAM)0,(LPARAM)ValueName); //lr == 0
dError = GetLastError();  // dError == 1460
lr=  SendMessage(hCombo,(UINT)CB_GETCOUNT,(WPARAM)0,(LPARAM)0); //lr == 3
dError = GetLastError();  // dError == 1460

[ Screen Capture ][ Tool Tip ]

Re: Not able to add Item in Combo Box

Nishad S29-Oct-07 2:10

Nishad S

29-Oct-07 2:10

I got the problem... Smile | :)

CB_ADDSTRING has no effect on last error.

Try like this and you will get the answer...

SetLastError( 10 );
SendDlgItemMessage( hDlg, IDC_COMBO1, CB_ADDSTRING, 0, (LPARAM)L"Apple" );

- NS -

Re: Not able to add Item in Combo Box

GauranG Shah29-Oct-07 2:24

GauranG Shah

29-Oct-07 2:24

Thnx Again. But its NOT working. I tried you code in WM_INITDIALOG and in Button even also. But its not showing anything in the combo box.

[ Screen Capture ][ Tool Tip ]

Re: Not able to add Item in Combo Box[solved]

GauranG Shah29-Oct-07 2:29

GauranG Shah

29-Oct-07 2:29

sorry for my post. It was happpening due to the silly mistake. the hight of the comobox was too small to show the charcters in it. I just take the new combo box with greater hight and problem solved.

Thnx a lot for your help

[ Screen Capture ][ Tool Tip ]

Re: Not able to add Item in Combo Box[solved]

Nishad S29-Oct-07 2:31

Nishad S

29-Oct-07 2:31

OK... kindly ignore my next solution... ha ha... Wink | ;)

- NS -

Re: Not able to add Item in Combo Box[solved]

Hamid_RT29-Oct-07 2:41

Hamid_RT

29-Oct-07 2:41

Wow so your problem wasnt combobbox and your answer was MoveWindow Big Grin | :-D

Re: Not able to add Item in Combo Box

Nishad S29-Oct-07 2:29

Nishad S

29-Oct-07 2:29

But the return value is the indication of success and again the count is correct as per your previous post... What kind of combobox is that? Can you check your code by doing as follows?

1. Add some items to combobox and through the resource editor
2. Comment out the dynamic item adding (CB_ADDSTRING) codes
3. Run the application and test it

- NS -

Re: Not able to add Item in Combo Box

Roger Broomfield29-Oct-07 2:16

Roger Broomfield

29-Oct-07 2:16

CB_ADDSTRING returns the index of the item added, or CB_ERR ( = -1) if an error occurs, CB_ERRSPACE if insufficient space available. You add 3 items of the same value, each time the return value is 0, this is totally consistent with a combobox that has the CBS_SORT style. Furthermore the CB_GETCOUNT return value is 3 indicating that 3 items were infact added. Also there is no indication in the documentation of CB_ADDSTRING that it calls SetLastError() when an error occurs.

Re: Not able to add Item in Combo Box

saravana00129-Oct-07 0:43

saravana001

29-Oct-07 0:43

U can add a string to a combo box using

CString string1;
m_combobox.AddString(String1);

here m_combobox is the member variable of the combo box.

Regards..
Saravana..

Provided...

CPallini29-Oct-07 0:52

CPallini

29-Oct-07 0:52

Provided you're usign MFC, my dear (the OP uses Win32 API)...
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: Not able to add Item in Combo Box

GauranG Shah29-Oct-07 1:05

GauranG Shah

29-Oct-07 1:05

Thnx but I am using WIN32 based Dialog Box.

[ Screen Capture ][ Tool Tip ]

Re: Not able to add Item in Combo Box

Hamid_RT29-Oct-07 2:38

Hamid_RT

29-Oct-07 2:38

Your code is working for me how did you make combobox can you show that code?

CListCtrl problem: How to set the item state to selected state?

fantasy121529-Oct-07 0:04

fantasy1215

29-Oct-07 0:04

I extended my own ListCtrl class

CMyListCtrl: public CListCtrl

My wanted function: when I press 'CTRL + A', select all rows in the list control.
I implement the OnKeyDown(prarameters) method and map the ON_WM_KEYDOWN message.
But I don't know how to set the selected state of items, Anyone could help me?

Re: CListCtrl problem: How to set the item state to selected state?

CPallini29-Oct-07 0:09

CPallini

29-Oct-07 0:09

Have a look at SetItemState method.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: CListCtrl problem: How to set the item state to selected state?

Nishad S29-Oct-07 0:12

Nishad S

29-Oct-07 0:12

Use SetItemState( -1, LVIS_SELECTED, LVIS_SELECTED );

- NS -

Re: CListCtrl problem: How to set the item state to selected state?

fantasy121529-Oct-07 1:04

fantasy1215

29-Oct-07 1:04

thx very much,
Actually I'm not sure about SetItemState, now I have your example.

CRectTracker

kk.tvm28-Oct-07 23:24

kk.tvm

28-Oct-07 23:24

Hi
In my program CRectTracker class is used to resize a window. How to control rectangle ( shadow rectangle draws while dragging mouse) while resizing the window. I use TrackRubberBand function.

thanks in advance

-RisKhan-

about time and time_t

George_George28-Oct-07 22:18

George_George

28-Oct-07 22:18

Hello everyone,

In MSDN for time function,

time_t time(
time_t *timer
);

http://msdn2.microsoft.com/en-us/library/1f4c8f33(VS.80).aspx

the return value of time is time_t, but in the Return Value section, it mentioned,

Return the time as seconds elapsed since midnight, January 1, 1970. There is no error return.

So, I am wondering whether time_t could be represented as elapsed number of seconds correctly and safely -- no data lost if we convert return value to unsigned long?

Like,

unsigned long second = time (NULL);

thanks in advance,
George

Re: about time and time_t

Roger Broomfield28-Oct-07 23:08

Roger Broomfield

28-Oct-07 23:08

In time.h

typedef long time_t;

Re: about time and time_t

George_George28-Oct-07 23:39

George_George

28-Oct-07 23:39

Thanks Roger,

Your answer is helpful!

regards,
George

DllRegisterServer

George_George28-Oct-07 21:57

George_George

28-Oct-07 21:57

Hello everyone,

I am wondering when function DllRegisterServer will be invoked? I am using Visual Studio 2005 to develop an in-process native (unmanaged) C++ COM. I am wondering when it will be invoked?

1. During the build process or during the DLL initialization process?
2. I find this function only works for debug mode, not release mode. Is that correct?

In MSDN,

http://msdn2.microsoft.com/en-us/library/ms682162.aspx

there are not too much information about when this method will be invoked and whether it works for both debug mode code and release mode code.

thanks in advance,
George

Re: DllRegisterServer

CPallini29-Oct-07 0:59

CPallini

29-Oct-07 0:59

DllRegisterServer it's typically called when you need to register the COM component (for instance, by regsvr32). Note: usually Visual Studio registers the component as (if I remember well) a post build step.

George_George wrote:
2. I find this function only works for debug mode, not release mode. Is that correct?

No. The function must work also in release mode, otherwise you cannot deploy (the release mode) component.

Hope that helps.

Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: DllRegisterServer

George_George29-Oct-07 2:10

George_George

29-Oct-07 2:10

Thanks CPallini,

I do not explicitly call regsvr32 in build process. For the build process, I
simply use Visual Studio 2005 IDE to build. Smile | :)

I suspect regsvr32 invokes DllRegisterServer since I set the following
option to yes in debug configuration,

Linker --> General --> Register Output to yes

But I am not sure. Any comments?

regards,
George

Re: DllRegisterServer

Paresh Chitte29-Oct-07 2:42

Paresh Chitte

29-Oct-07 2:42

George_George wrote:
I do not explicitly call regsvr32 in build process. For the build process, I
simply use Visual Studio 2005 IDE to build.

I suspect regsvr32 invokes DllRegisterServer since I set the following
option to yes in debug configuration,

Linker --> General --> Register Output to yes

Custom build step is at

Project | Properties | Custom Build Step | Command Line.

Here you will find something like

regsvr32  /s/c "$(TargetPath)"<br />
echo regsvr32 exec. time > "$(OutDir)\regsvr32.trg"

Regards,
Paresh.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.