listView question
in [MFC]
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From: Rich on 15 Feb 2005 20:45 Hi guys, I am using listView on Dialog and need to refresh it with a button, the following is the code. void CMyList::OnBnClickedRun(int ix, float x) { CString str; m_myList.InsertColumn(0, "Name1", LVCFMT_LEFT, 100); m_myList.InsertColumn(1, "Name2", LVCFMT_LEFT, 100); m_myList.DeleteAllItems(); LV_ITEM lvItem; lvItem.mask = LVIF_TEXT | LVIF_STATE; lvItem.state = 0; lvItem.stateMask = 0; str.Format(" %d", ix); m_myList.InsertItem(0, str); str.Format("%3.1f", x); m_myList.SetItemText(0, 1, str); } When I first click the refresh button, everything is alright. But when I click the button again, I always get a message The exception Breakpoint A breakpoint has been reached.... When click cancel to debug it, I always get to here #undef _CrtDbgBreak _CRTIMP void _cdecl _CrtDbgBreak( void ) { DebugBreak(); } Any body has some idea what's wrong with my code? Many thanks! rich
From: Scott McPhillips [MVP] on 15 Feb 2005 21:16 Rich wrote: > Hi guys, > > I am using listView on Dialog and need to refresh it with a button, the > following is the code. > > void CMyList::OnBnClickedRun(int ix, float x) > { > CString str; > m_myList.InsertColumn(0, "Name1", LVCFMT_LEFT, 100); > m_myList.InsertColumn(1, "Name2", LVCFMT_LEFT, 100); > > m_myList.DeleteAllItems(); > LV_ITEM lvItem; > lvItem.mask = LVIF_TEXT | LVIF_STATE; > lvItem.state = 0; > lvItem.stateMask = 0; > str.Format(" %d", ix); > m_myList.InsertItem(0, str); > str.Format("%3.1f", x); > m_myList.SetItemText(0, 1, str); > > } > > When I first click the refresh button, everything is alright. But when I > click the button again, I always get a message > > The exception Breakpoint > A breakpoint has been reached.... > > When click cancel to debug it, I always get to here > > #undef _CrtDbgBreak > > _CRTIMP void _cdecl _CrtDbgBreak( > void > ) > { > DebugBreak(); > } > > Any body has some idea what's wrong with my code? Many thanks! > > rich Why are you inserting (again!) the first two columns each time? To analyze the debug break study the stack window when you hit the break. This window will lead you back to the exact line in your code that caused the problem. Also check the output window to see if the CRT has sent you an error message. -- Scott McPhillips [VC++ MVP]
From: Rich on 16 Feb 2005 01:03 Thanks Scott. I put some edit boxes to input data and listView to output the results on a Dialog. So when I make some change in the input, I want to get a new list of results. I've tried a few things: 1. to avoid re-inserting the headers, I jump the two lines in second times and thereafter, error will appear at the first inserting of item; 2. use deleteAll() to clear current listView and write again, error appears at the delete line; But in the same program, I used a similar listView in a formView class and it works well. Really strange. Thanks again. rich "Scott McPhillips [MVP]" wrote: > > Why are you inserting (again!) the first two columns each time? > > To analyze the debug break study the stack window when you hit the > break. This window will lead you back to the exact line in your code > that caused the problem. Also check the output window to see if the CRT > has sent you an error message. > > -- > Scott McPhillips [VC++ MVP] > >
From: Joseph M. Newcomer on 16 Feb 2005 14:34 This is a pretty useless error report. What is the call stack? This is critical. It may well be that what you are seeing is heap damage caused by some other malfunction in your program. In this case, the line that detects the problem (which is what you are possibly seeing) is completely unrelated to the code that CAUSED the problem. But without the critical call stack traceback, it is impossible to tell what is going on, because ALL breaks caused by various error conditions go to CrtDbgBreak, so that is completely meaningless. It is also meaningless to know that it came from your list insert code, unless we know the execution path between the two events. Given the detail you have provided, the only possible answer to what is wrong with your program is "your program is broken". Why aren't you setting the columns once in OnInitDialog? Then you don't have to do anything special to "skip" their initialization! joe On Tue, 15 Feb 2005 17:45:09 -0800, "Rich" <Rich(a)discussions.microsoft.com> wrote: >Hi guys, > >I am using listView on Dialog and need to refresh it with a button, the >following is the code. > >void CMyList::OnBnClickedRun(int ix, float x) >{ > CString str; > m_myList.InsertColumn(0, "Name1", LVCFMT_LEFT, 100); > m_myList.InsertColumn(1, "Name2", LVCFMT_LEFT, 100); > > m_myList.DeleteAllItems(); > LV_ITEM lvItem; > lvItem.mask = LVIF_TEXT | LVIF_STATE; > lvItem.state = 0; > lvItem.stateMask = 0; > str.Format(" %d", ix); > m_myList.InsertItem(0, str); > str.Format("%3.1f", x); > m_myList.SetItemText(0, 1, str); > >} > >When I first click the refresh button, everything is alright. But when I >click the button again, I always get a message > >The exception Breakpoint >A breakpoint has been reached.... > >When click cancel to debug it, I always get to here > >#undef _CrtDbgBreak > >_CRTIMP void _cdecl _CrtDbgBreak( > void > ) >{ > DebugBreak(); >} > >Any body has some idea what's wrong with my code? Many thanks! > >rich Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
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