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i want to display data from text file in list view and in tree view root will be file name, but i dont know how to do it, the problem is with displaying text file data in list view, i don't know anything about that.
text file data is very simple
it is just a square matrix of double values like:
21.06 34.06 5.0
12.78 45.25 6.9
12.89 45.98 5.5
in list view i want to display it.
Have a look at the MFC CListCtrl class
First, have a look at CStdioFile Class and/or at How to read a text file line by line?.
Next, to parse each particular line, use CString::Tokenize.
Finally, fill the listview control, using CListCtrl methods, as Victor already suggested.
these are the things i can just read and understand im totally new at this can smone plz give me step by step guide and some sample code, i know how to create list view and adding items and columns but i dont know how to do it with file i have done reading file line by line using other method at some other place for storing values in matrix but i dont know reading here for list view, can smone help me with sample code for the example i quoted in first post
Well, why don't you ask for the entire program then? Ovidiu already provided links to examples, so why don't you start by looking at them and give them a try. You shouldn't expect others to do your work. Instead you should try harder by yourself.
Even advanced programmers can be "totally new" in some circumstances until reading and understanding the documentation. That's programmer's life, often you have to sweat a little instead of asking others to do all the work for you, for free.
Just giving some more hints:
- If using MFC, to fill a listview, have a look at CListCtrl::InsertColumn, CListCtrl::InsertItem, and CListCtrl::SetItem / CListCtrl::SetItemText.
- If not using MFC but plain WinAPI, have a look at LVM_INSERTCOLUMN, LVM_INSERTITEM, and LVM_SETITEM / LVM_SETITEMTEXT.
- For documetation details and examples, have a search in MSDN Library.
- Also you can have a look in Codeguru's ListView Control Articles.
After that, if something isn't yet clear and/or doesn't work as expected, show us what you have tried to do, then we can help you with more details and advices.
And here is a quick example, filling a listview control by using MFC:
Of course, you can notice that's not exactly for copy-paste purpose.Code:const int nColCount = 10;
const int nRowCount = 100;
CString strText;
// add listview columns
for(int nCol = 0; nCol < nColCount; nCol++)
{
strText.Format(_T("Column %d"), nCol);
m_listCtrl.InsertColumn(nCol, strText, LVCFMT_LEFT, 100, nCol);
}
// add and set listview items
for(int nItem = 0; nItem < nRowCount; nItem++)
{
m_listCtrl.InsertItem(nItem, NULL);
for(int nSubItem = 0; nSubItem < nColCount; nSubItem++)
{
strText.Format(_T("Item (%02d, %02d)"), nItem, nSubItem);
m_listCtrl.SetItemText(nItem, nSubItem, strText);
}
}
It's to just to show "HOW TO", like many other examples you can find over the internet, in manuals, documentation, tutorials, and so on.
Next, you have to sweat a little and adapt it to your specific requirements/needs.
i dont have any problem with creating right view, thanx for your help but i already know that, what im asking is about reading file and tokenizing and then getting access to that read data for displaying. my questions
i have tried reading file and have made ReadTextFile(...) member function of listview class
Q1. is this function called automatically somewhere or i have to call it explicitly
Q2. if i have to call it explicitly somewhere im confused ,how to provide its parameters i.e LPCTSTR pszFileName, CStringArray& arrLines from where did i get them
Q3. tokenize is used to parse string so first i have to get string from arrlines right?arrLines.Add(strLine); is used to add string ,which function is better to be used for getting string from arrlines?
pardon me for asking basics but im quite new to visual c++ thats why.
1) You would have to call it explicitly. Why would you think otherwise?Quote:
Originally Posted by tspga
2) You know the name of the file, not us. I don't really see why you need a CStringArray at all, but it could be a member of your view class.
3) ovidiucucu gave you links in post #3.
i have to get the file name from open file dialog so i must call this function in either openfile or open document and then pass it on to this read function
and question 3 was asked after viewing those links i have viewed but you have not Q3 was about the things not mention in that link
Is your application SDI, MDI or dialog-based?
Is your class which keeps the listview control derived from CListView or CListCtrl?
CString str( arr.GetData() ); i tried this and getting errors like
CString(const class CString &)' : cannot convert parameter 1 from 'class CString *' to 'const class CString &' when i try this
CAtlString str( arr.GetData() ); it says
error C2065: 'CAtlString' : undeclared identifier
E:\MyProjects\my interface\CExerciseDoc.cpp(93) : error C2146: syntax error : missing ';' before identifier 'str'
E:\MyProjects\my interface\CExerciseDoc.cpp(93) : error C2065: 'str' : undeclared identifier
when i include header #include "cstringt.h" it says header file not found.
yes it is SDI and windows explorer based, and has dialogs from menu
class CRightView : public CListView
yes this is the case.
yes it is SDI and windows explorer based, and has dialogs from menu
class CRightView : public CListView
yes this is the case.
This is wrong, and I just can guess your intention is to extract an element from an array (CStringArray).Quote:
Originally Posted by tspga
For doing that, you have to use CStringArray methods GetAt, ElementAt, or operator [].
You should give such information from the beginning. Now, it's pretty clear what you want to accomplish.Quote:
Originally Posted by tspga
Let's try to solve it, step by step!
Presume we have CDemoDocument and CDemoListView, derived from CDocument and CListView, respectively.
First, in document-view architecture it's good to keep data in the document class (the class derived from CDocument). To avoid a bi-dimensional array, I would like to suggest an array of strings, each element being a line read from a text file.
So, step 1: add a CStringArray member to CDemoDocument and a public method to retrieve in the CDemoListView class.
[ to be continued ]Code:class CDemoDocument : public CDocument
{
// ...
// Attributes
private:
CStringArray m_arrLines;
// Operations
public:
CStringArray& GetDocumentData() {return m_arrLines;}
// ...
};
[ continued ]
Step 2: Read from text file and fill CDemoDocument::m_arrLines.
One common place to load the document is the overridden CDocument::Serialize.
However, this is not the best place in our case. We can get a CFile*pointer from CArchive argument or the file name. First is no use, because we need CStdioFile* (derived from CFile*). Also, we cannot use the file name because further we canget a share violation.
So better let's override CDocument::OnOpenDocument and simply call _ReadTextFile, similar to the method from that FAQ mentioned earlier.
Code:class CDemoDocument : public CDocument
{
// ...
// Attributes
private:
CStringArray m_arrLines;
// Operations
public:
CStringArray& GetDocumentData() {return m_arrLines;}
// ...
// ...
// Overrides
virtual BOOL OnOpenDocument(LPCTSTR lpszPathName);
// Implementation
private:
void _ReadTextFile(LPCTSTR pszFileName, CStringArray& arrLines);
};
[ to be continued ]Code:BOOL CDemoDocument::OnOpenDocument(LPCTSTR lpszPathName)
{
if (!CDocument::OnOpenDocument(lpszPathName))
return FALSE;
_ReadTextFile(lpszPathName, m_arrLines);
return TRUE;
}
void CDemoDocument::_ReadTextFile(LPCTSTR pszFileName, CStringArray& arrLines)
{
arrLines.RemoveAll();
CString strLine;
TRY
{
CStdioFile file(pszFileName, CFile::modeRead);
while(file.ReadString(strLine))
arrLines.Add(strLine);
}
CATCH_ALL(e)
{
e->ReportError(); // shows what's going wrong
}
END_CATCH_ALL
}
[ continued ]
Step 3: Filling the list.
When a file has been open, the MFC document-view (SDI/MDI) framework automatically calls the virtual method CView::OnUpdate.
Bingo! Here is the right place to fill the list.
What we have to do is to override OnUpdate, get data from the document which is an array of strings, tokenize each string and finally fill thelist. Like a walking in the park. :)
Here is the code copleting my example:
Code:class CDemoListView : public CListView
{
//...
// Generated message map functions
protected:
DECLARE_MESSAGE_MAP()
virtual void OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint);
// Implementation
private:
int _GetListColumnCount() const;
void _ClearList();
void _FillList();
};
Code:void CDemoListView::OnUpdate(CView* pSender, LPARAM lHint, CObject* pHint)
{
_ASSERT((GetStyle() & LVS_TYPEMASK) == LVS_REPORT); // set report style, dude!
_ClearList();
_FillList();
}
Code:void CDemoListView::_ClearList()
{
CListCtrl& listCtrl = GetListCtrl();
// delete all list items
listCtrl.DeleteAllItems();
// delete all list columns
CHeaderCtrl* pHeader = listCtrl.GetHeaderCtrl();
const int nColCount = _GetListColumnCount();
if(nColCount > 0)
{
for(int nCol = 0; nCol < nColCount; nCol++)
{
pHeader->DeleteItem(0);
}
}
}
Code:void CDemoListView::_FillList()
{
CListCtrl& listCtrl = GetListCtrl();
// get the document data
CDemoDocument* pDoc = GetDocument();
CStringArray& arrLines = pDoc->GetDocumentData();
// fill the list
const int nLineCount = (int)arrLines.GetCount();
for(int nLine = 0; nLine < nLineCount; nLine++)
{
// add an emtpty item
listCtrl.InsertItem(nLine, NULL);
// now, let's tokenize the line and fill sub-items
CString strLine = arrLines.GetAt(nLine);
CString strToken, strCaption;
int nTokenCount = 0; // count tokens
int nCurPos = 0; // used in tokenize
// first token
strToken = strLine.Tokenize(_T(" "), nCurPos);
while(!strToken.IsEmpty())
{
++nTokenCount;
const int nCol = nTokenCount - 1;
const int nColCount = _GetListColumnCount();
if(nTokenCount > nColCount)
{
// more tokens than colums, so add a new column
strCaption.Format(_T("Column %d"), nCol);
listCtrl.InsertColumn(nCol, strCaption, LVCFMT_LEFT, 100, nCol);
}
// set subitem text
listCtrl.SetItemText(nLine, nCol, strToken);
// next token
strToken = strLine.Tokenize(_T(" "), nCurPos);
}
}
}
Final notes:Code:int CDemoListView::_GetListColumnCount() const
{
CListCtrl& listCtrl = GetListCtrl();
int nColCount = 0;
// count the header items in order to get the number of colums
CHeaderCtrl* pHeader = listCtrl.GetHeaderCtrl();
if(NULL != pHeader)
{
nColCount = pHeader->GetItemCount();
}
return nColCount;
}
- This is just a brief example. Although it works, you have to test, complete and solve bugs if any.
- If something is going wrong or is not enough clear, please do not hesitate to ask!
- You owe me a couple of beers (virtual, of course). :)
thankyou for your help, small and may be last question e.g there is object named sol of type solutions im calling updateAllViews and passing this object, doing type cast that object, after which it automatically goes to onupdate of left view and ryt view, but im stuck with ryt view i dont know how to give that data to onselchnge function that data has to be passed to onupdate ryt? then how should i send it to onselchnge , actually i dont know how to use onupdate of list view with onselchange of left view, kindly try to reply soon its urgent