How to populate a TreeView made in resource script - c++

Question

I have to make a C++, VSPackage that contains a TreeView. I added one in the default dialog window of the project resource script (*.rc) from the toolbox window. The problem is that I don't know how to add items to it.
I looked on many websites but they have code for C# or other types of projects.
I found a project made by Song Ho Ahn and also the source code that can be found at the bottom of this website TreeView.
I tried to go to the TreeView properties window to see if there is something so I can add items to it and then finding a way to replace them, but nothing. I tried to use the code he written just to help me find a solution to my problem, but I couldn't find it. Maybe it's the "handler" and the "parent", which I don't know how to use.
void set(HWND parent, int id, bool visible=true)
{
this->parent = parent;
handle = GetDlgItem(parent, id);
if(!visible) disable();
}
I want to mention that I'm a beginner with VSPackage and that I didn't made a project this big before.
If somebody can explain to me what to do, send me on a path or even say that I'm stupid and the solution is a simple one, I will appreciate it very much.

Answer 1

In the snippet you've posted, you're using native WIN32 API. So you might look into the documentation of TVM_INSERTITEM message.
Here is a little snippet to add a single entry to a TreeView control (regardless if created by a resource script or a call of CreateWindow(..)):
TVITEM tvi;
TVINSERTSTRUCT tvins;
HTREEITEM hItem;
/* setup new item */
tvi.mask = TVIF_TEXT; // just text
tvi.pszText = "Hello TreeView!";
tvi.cchTextMax = 0; // ignored if creating the item
/* setup insertion structure of item */
tvins.hParent = TVI_ROOT; // insert item at root level
tvins.item = tvi; // item description setup above
tvins.hInsertAfter = NULL; // instert on top of the tree view
hItem = (HTREEITEM)SendMessage(GetDlgItem(hWnd, IDC_TREEVIEW), // update parameters of GetDlgItem(..) according to your code
TVM_INSERTITEM,
0,
(LPARAM)(LPTVINSERTSTRUCT)&tvins);
if (hItem == NULL)
{
/* something went wrong */
}