Thread: Getting the lParam associated to a treeview's item?

Try the following.

Code:

char gbff[300];
DWORD dwValue;
HTREEITEM htree;

htree=(HTREEITEM)SendMessage(theTreeViewControlHandle,TVM_GETNEXTITEM,(WPARAM)TVGN_ROOT,(LPARAM)htree);
memset(&tvi,0,sizeof(tvi));
tvi.mask=TVIF_PARAM|TVIF_TEXT;
tvi.pszText=gbff;
tvi.cchTextMax=300;
//tvi.lParam=dwValue;No need to set this value. It will be set in the output.
tvi.hItem=htree;
SendMessage(GetDlgItem(hwnd,ARBRE),TVM_GETITEM,0,(LPARAM)&tvi);

MessageBox(hwnd,gbff,"",MB_OK);
sprintf(gbff,"%d, %d",LOWORD(tvi.lParam),HIWORD(tvi.lParam)); // Pass tvi.lmParam instead of dwValue.
MessageBox(hwnd,gbff,"",MB_OK);

Hello SoLoMoN BaNdA, thanks for your time.

I tryed but I get the same result. That's how I add the new item

Code:

TV_ITEM tvi;
TVINSERTSTRUCT tvis;
memset(&tvi,0,sizeof(tvi));
tvi.mask=TVIF_TEXT|TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_STATE;
tvi.state=TVIS_BOLD;
tvi.pszText=TEXT(root);
tvi.cchTextMax=lstrlen(tvi.pszText);
tvi.iImage=1;
tvi.iSelectedImage=1;
tvi.lParam=MAKELPARAM(14,852);

memset(&tvis,0,sizeof(tvis));
tvis.hParent=TVI_ROOT;
tvis.hInsertAfter=TVI_LAST;
tvis.item=tvi;
SendMessage(arbre,TVM_INSERTITEM,0,(LPARAM)&tvis);

I think that there's no error, if not the item won't be added. Maybe I'm doing something wrond here but I can't see what.

Niara

Uf, what a silly problem: I was missing the TVIF_STATE on the tv_item mask. Problem solved, now it works.

Thanks for read it.
Niara

Originally Posted by Niara

Hello SoLoMoN BaNdA, thanks for your time.

I tryed but I get the same result. That's how I add the new item

I think that there's no error, if not the item won't be added. Maybe I'm doing something wrond here but I can't see what.

Niara

Yes. that is how you should add the item, because for that you have to send all the information about that item.
But in this case, since you want info rather than send info, you do not have to set lParam to the value of dwValue. Even if you did, the changes in lParam will not be show in dwValue.

Originally Posted by Niara

I was missing the TVIF_STATE on the tv_item mask. Problem solved, now it works.Niara

Yes, I missed it too. But even then, I believe that you should make the changes I mentioned. Please tell me if I am wrong. I didn't compile and see.

Hey SoLoMoN BaNdA, you're right.

After testing your first post's code I didn't modifyed the

Code:

sprintf(gbff,"%d, %d",LOWORD(tvi.lParam),HIWORD(tvi.lParam))

part on my code, but I still thought that assigning a dword variable to the 'tv_item.lParam' would work, such as it works with listviews. but after read your last post I tryed and does not work, like the 'lParam' value is only to assign value, not to retrieve.

Thank's to clarify that last point.
Niara