Question

How to create a listview

Asked by: OutlawZ

Hello,
i've been trying to create a listview. I dont get any compile errors but it cant create the listview either when i run the program.
Ill post the WndProc only so it wont look messy with all the codes. And its the only important thing you need to see i guess.


LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
      switch(msg)
      {
      case WM_CREATE:
            //draw the listview
            lstv_schedule = CreateWindowEx(WS_EX_CLIENTEDGE,WC_LISTVIEW,"schedule", LVS_ICON | WS_CHILD | LVS_AUTOARRANGE | LVS_SINGLESEL | LVS_SHOWSELALWAYS,20,20, 30,40, hwnd,(HMENU)IDB_SCHEDULE,((LPCREATESTRUCT)lParam)->hInstance,NULL);
            
            
            //lstv_schedule = CreateWindowEx(0, WC_LISTVIEW, "", LVS_ICON | WS_CHILD | LVS_AUTOARRANGE | LVS_SINGLESEL | LVS_SHOWSELALWAYS, 0, 0, 640, 480, hwnd, (HMENU)IDB_SCHEDULE, GetModuleHandle(NULL), NULL);
            

            if(lstv_schedule==NULL){
            MessageBox(NULL, "Could not create the window properly.", "Error", MB_OK | MB_ICONERROR);
            PostQuitMessage(0);
            }

            break;

      /*** On Exit ***/
      case WM_CLOSE:
            DestroyWindow(hwnd);
            break;
      case WM_DESTROY:
            PostQuitMessage(0);
            break;
      default:
            return DefWindowProc(hwnd,msg,wParam,lParam);
      }

      return 0;
}


I get the messagebox everytime that it couldnt create the listview.
Can someone please tell me what i've been doing wrong.

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Asked On
2005-07-31 at 13:16:44ID21510670
Tags

wc_listview

Topic

C++ Programming Language

Participating Experts
5
Points
125
Comments
11

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Answers

 

by: jweston1Posted on 2005-07-31 at 14:59:05ID: 14566412

You can try calling InitCommonControlsEx with ICC_LISTVIEW_CLASSES. It requires commctrl.h and comctl32.lib.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/common/functions/initcommoncontrolsex.asp

 

by: AlexFMPosted on 2005-07-31 at 22:03:29ID: 14567551

What is WC_LISTVIEW? I think it should be SysListView32.
Call GetLastError after CreateWindowEx, what is it's return value?

 

by: hemakumarPosted on 2005-08-01 at 00:42:58ID: 14568006

1)InitCommonControls.
2)Use the classname as "SysListView32"

like which are specified avove.

3)use WS_VISIBLE style
or explicitly call ShowWindow(for the handle,..,);

 

by: OutlawZPosted on 2005-08-01 at 03:42:34ID: 14568673

Thanks for the help so far, im gonna try this out later this day. Im not at home right now so thats why i cant do it.

 

by: PlanetCppPosted on 2005-08-01 at 06:20:04ID: 14569576

WC_LISTVIEW = SysListView32, but f you use WC_LISTVIEW then if something changes in the future you'll still be good

 

by: hemakumarPosted on 2005-08-01 at 06:39:14ID: 14569721

#define  WC_LISTVIEWA "SysListView32"
#define  WC_LISTVIEWW  L"SysListView32"

used for ansi and unicode versions what u have said is right. it is better to use WC_LISTVIEW and u have an advantage for compilation and for future even if the classname changes there should be no problem.

 

by: OutlawZPosted on 2005-08-01 at 11:48:10ID: 14572709

I've got it working now. But i was wondering about what hemakumar said.
Why would i need

#define  WC_LISTVIEWA "SysListView32"
#define  WC_LISTVIEWW  L"SysListView32"

Cause it also work without that?
Anywayz heres the code, maybe its also usefull for someone else.

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
      switch(msg)
      {
      case WM_CREATE:
            //draw the listview            
            InitCommonControls();
            lstv_schedule = CreateWindowEx(WS_EX_CLIENTEDGE,WC_LISTVIEW,"schedule", WS_VISIBLE | WS_CHILD,20,20, 30,40, hwnd,(HMENU)IDB_SCHEDULE,((LPCREATESTRUCT)lParam)->hInstance,NULL);
            
            
            break;            


      /*** On Exit ***/
      case WM_CLOSE:
            DestroyWindow(hwnd);
            break;
      case WM_DESTROY:
            PostQuitMessage(0);
            break;
      default:
            return DefWindowProc(hwnd,msg,wParam,lParam);
      }

      return 0;
}

 

by: jweston1Posted on 2005-08-01 at 11:57:36ID: 14572803

You seem to be calling InitCommonControls inside the WM_CREATE message. Calling it once in your main function should be enough.

 

by: jweston1Posted on 2005-08-01 at 11:59:10ID: 14572816

Or, I should say the WM_CREATE message handler.

 

by: hemakumarPosted on 2005-08-01 at 23:53:39ID: 14576824

// I've got it working now. But i was wondering about what hemakumar said.
Why would i need
#define  WC_LISTVIEWA "SysListView32"
#define  WC_LISTVIEWW  L"SysListView32"
Cause it also work without that?
It will work without that is true.

Take little time to understand what that macro means.

select WC_LISTVIEW  in ur code AND right click go to definition .Then u will understand what i said.I never specified to use those macros.I was trying to explain u to understand what is the definition of macro.

Thank u.

 

by: itsmeandnobodyelsePosted on 2005-08-02 at 02:21:26ID: 14577372

>>>> Why would i need
>>>> #define  WC_LISTVIEWA "SysListView32"
>>>> #define  WC_LISTVIEWW  L"SysListView32"

MS sometimes works with 'A' and 'W' extension in macros. The purpose is to redefine the original function name either to a ANSI (8bit characters) or UNICODE (16bit character) alternative, e. g. for the sample above there could be preprocessor code somewhere in a system header above that is like

#ifdef UNICODE
#    define WC_LISTVIEW WC_LISTVIEWW  
#else
#    define WC_LISTVIEW WC_LISTVIEWA  
#endif


If your source includes that header directly or indirectly, you now are working with ANSI string "SysListView32". But when turning your project to a UNICODE project, you automatically would use the UNICODE version of CreateWindowEx - maybe switched by macro as well - that  requires a wide character string.

Regards, Alex

P:S: Though I know what happens I don't like these amcros. I never saw a project that could be switched from ANSI to UNICODE by simply defining the UNICODE macro. On the other hand you can't properly debug code parts that are defined by macro and if somehow some defines were mixed up you need days or weeks to clean up that stuff.

20120131-EE-VQP-002

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