Creating a TreeView problem

[C#er]

Hi fellows

I`m trying to create a treeview in my app but I don`t have any sucess.
I`ve read the Microsoft article http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/treeview/treeview.asp
and I`ve tried to do something like that. The problem is that whem I create a node in a function that I created it returns NULL. I think that my code is right, so what`s going on??
Thanks for the support.

Below is my code

I created my treeview like this:

treeViewHwnd = CreateWindowEx(WS_EX_LEFT, WC_TREEVIEW, "theTreeView", WS_CHILD|WS_VISIBLE|TVS_EDITLABELS|TVS_HASBUTTONS|TVS_HASLINES|TVS_LINESATROOT, 0, 0, 150, 600, hwnd, NULL, hCurrentInstance, NULL);


treeViewHwnd is a global HWND.

In this part I want to put a node in the treeview

case WM_CHAR:
{
switch(wParam)
{
case 'a':
{
InitCommonControls();
treeViewHwnd = GetDlgItem(hwnd, IDC_TREE1);
OpenedWindows(GetForegroundWindow());
for(int i = 0 ; i < sNameHwnds.size() ; i++)
{
InsertNodeInTV(hwnd, sNameHwnds[i], 1);
MessageBox(NULL, sNameHwnds[i].c_str(), "", MB_OK);
break;
}
break;
}


And here I create the node:

#define IDC_TREE1 10
HTREEITEM InsertNodeInTV(HWND tvHwnd, string sNodeName, int iLevel)
{
static HTREEITEM ParentItem, BeforeItem, RootItem;
ParentItem = (HTREEITEM)TVI_FIRST;
BeforeItem = RootItem = NULL;
TVINSERTSTRUCT treeViewInsert;
treeViewInsert.item.mask = TVIF_TEXT;
treeViewInsert.item.pszText = (char*)sNodeName.c_str();
treeViewInsert.item.cchTextMax = sizeof(treeViewInsert.item.pszText)/treeViewInsert.item.pszText[0];
treeViewInsert.hInsertAfter = TVI_ROOT;
treeViewInsert.hParent = NULL;
ParentItem = (HTREEITEM)SendDlgItemMessage(tvHwnd, IDC_TREE1, TVM_INSERTITEM, 0, (LPARAM)&treeViewInsert);
if(ParentItem == NULL)MessageBox(NULL, "aaa", "", MB_OK);
return ParentItem;
}

[Viorel]

I think you should try this:

Move the InitCommonControls call to the begining of your program. I suppose it must be executed before you create the tree.
For HMENU parameter of CreateWindowEx, specify the ID of your control: CreateWindowEx(. . ., (HMENU)IDC_TREE1, . . .).

I hope this helps.

[C#er]

I have done what you`ve said and some other things and works perfectly.


Thanks