C / C++ / MFC

10-May-02 8:10

I have a CTreeCtrl on my program
I want CTreeCtrl display data from database
I use ItemData to store id(key) from database, use item’s text to store text from database and then I need something to store the type of node

Please, anyone have any ideas how to solve this stupid problem.
sorry for bad english
Thanx

Confused | :confused:

mvorobiov

Navin10-May-02 8:13

Navin

10-May-02 8:13

You can cram a pointer into the item data. The pointer can point to an arbitrary structure which, in your case, might be the database id and the node type.

Of course, if you plan on ever compiling this app on a 64 bit machine, you'll have to be careful how you do this becuase pointer sizes will change. Smile | :)

No generalization is 100% true.
Not even this one.

mvorobiov10-May-02 8:27

10-May-02 8:27

Bingo!
Thanks i'll try it.

pnpfriend10-May-02 8:16

10-May-02 8:16

your data are like this...?
key text
--- ----
1 item1
2 item2

if i might probably just insert in this way like, item1 as a label of ctreectrl item and 1 (key) as item data.
the function might look like

<br />
TV_INSERTSTRUCT treeStruct<br />
memset (&treeStruct,0,sizeof(treeStruct));<br />
<br />
HTREEITEM parent = NULL;<br />
//add data to tree as parent<br />
parent = AddToTree(key,text,treeStruct,parent);<br />
<br />
// if you want data to be child <br />
AddToTree(key,text,treeStruct,parent);<br />
<br />
//function definition<br />
HTREEITEM AddToTree(int key,char text[_MAX_FNAME], TV_INSERTSTRUCT treeStruct, HTREEITEM Parent)<br />
{<br />
<br />
  treeStruct.hParent = Parent;<br />
  treeStruct.hInsertAfter = TVI_SORT;<br />
  treeStruct.item.mask = TVIF_TEXT | TVIF_PARAM;<br />
  treeStruct.item.cchTextMax = 500;<br />
  treeStruct.item.pszText = text;  // tree item label: folder name or file name<br />
  treeStruct.item.lParam = (DWORD)key;<br />
  Parent= m_TreeCtrl.InsertItem(&treeStruct); // insert to the tree control<br />
  return Parent;<br />
}<br />
<br />

hope it will help

mvorobiov10-May-02 8:37

10-May-02 8:37

No my data like this

node type 1 = Buildings
node type 2 = Employees
node type 3 = Department

I need to store in TreeItem, for example
BuildingID, BuildingName, NodeType1
EmployeeID, EmployeeName, NadeType2

NodeType need to resolve what type of node cliked by user
and what type of child node insert to current node
i have few collection of this objects(Buildings, Employees)
couse node type use to resolve in what collection search appropriate
object

Confused | :confused:

Derek Lakin10-May-02 8:47

Derek Lakin

10-May-02 8:47

I've used the item image for this kind of thing before. Have a different image for different node types (one for Buildings, one for Employees, etc). Then you do a check for the image of the selected node, which gives you the node type Cool | :cool:

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

mvorobiov10-May-02 8:55

10-May-02 8:55

yes i think about this too
that's my back up

but may by some ideas of using cChildren in TV_ITEM structure

thank you for your answer

pnpfriend10-May-02 9:05

10-May-02 9:05

hmm.. i can't help i . i'm having my own trouble with sorting my file tree .
dont' mind if i ask you?? or any of you since you guys knows more about treectrl than me.

CArray

pnpfriend10-May-02 7:59

10-May-02 7:59

how can i use CArray.
i have class called FileInfo

<br />
class FileInfo<br />
{<br />
  public : <br />
    int status;<br />
    CString path;<br />
    CString name;<br />
    CString size;<br />
    CString createdTime;<br />
    CString lastWrite;<br />
    CString lastAccess;<br />
    CString type;<br />
};<br />

and i want to put FileInfo into CArray. so I declear like this

<br />
CArray <' FileInfo*,FileInfo* '> *fileArray; // ignore the ' single quote. it is not there in my application. <br />
<br />
// add to array<br />
FileInfo *fileinfo = new FileInfo();<br />
fileinfo->name = "hi hi";<br />
fileArray->Add(fileinfo);<br />
<br />

i got run time error. no error for compile time
how can i fix that?

Martin Ziacek10-May-02 8:10

Martin Ziacek

10-May-02 8:10

CArray <FileInfo, FileInfo &> fileArray;

Navin10-May-02 8:14

Navin

10-May-02 8:14

Or, alternatively, use CTypedPtrArray to store pointers.

No generalization is 100% true.
Not even this one.

pnpfriend10-May-02 9:00

10-May-02 9:00

would it be the way to use CTypedPrtArray??

<br />
CTypedPtrArray <FileInfo,FileInfo*> *a;<br />
  FileInfo *fileinfo = new FileInfo();<br />
  FileInfo *fileinf = new FileInfo();<br />
<br />
  fileinfo->name = "he ha";<br />
  a->Add(fileinfo);<br />
  <br />
  fileinf = a->GetAt(0);<br />
  MessageBox(fileinf->name);<br />

Navin10-May-02 9:35

Navin

10-May-02 9:35

Not quite. CTypedPtrArray is, like CArray, a template class. You can get more info from MSDN, but in a nutshell:

CTypedPtrArray<CPtrArray, FileInfo *> a;

Then do the rest like you had there. Note that since it is an array of pointers, you are responsible for deleteing the pointers when necessary.

No generalization is 100% true.
Not even this one.

pnpfriend10-May-02 9:02

10-May-02 9:02

i got it. now.

<br />
CTypedPtrArray <CPtrArray,FileInfo*> a;<br />
  FileInfo *fileinfo = new FileInfo();<br />
  FileInfo *fileinf = new FileInfo();<br />
<br />
  fileinfo->name = "he ha";<br />
  a.Add(fileinfo);<br />
  <br />
  fileinf = a.GetAt(0);<br />
  MessageBox(fileinf->name);<br />

rose!

thanks

pnpfriend10-May-02 8:46

10-May-02 8:46

uh... i dont' know how to use it.. coz i get run time error again.. Confused | :confused:

please tell me how.

this is what i did

<br />
CArray <FileInfo,FileInfo &>*a;<br />
  FileInfo fileinfo;;<br />
<br />
  fileinfo.name = "testing... testing....";<br />
  a->Add(fileinfo);<br />
  FileInfo fileInfo;<br />
<br />
  fileInfo = a->GetAt(0);<br />
  MessageBox(fileInfo.name);<br />

Martin Ziacek10-May-02 8:53

Martin Ziacek

10-May-02 8:53

I am sorry, I should be more specific. Do this:

CArray <FileInfo, FileInfo &> fileArray;
FileInfo fileinfo;

fileinfo.name = ...
fileArray.Add(fileinfo);
...
fileinfor = fileArray[0];
MessageBox(fileInfo.name);

Rose | [Rose]

pnpfriend10-May-02 9:08