SHBrowseForFolder and SHGetPathFromIDList

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When I display a directory tree (via SHBrowseForFolder and SHGetPathFromIDList) starting at a directory of my choosing, that directory is always at the bottom of the display panel. Is there a way to get it to start out somewhere else (like the middle of the panel)?

(Sorry about not including a picture but I can't seem to attach one.)

Posted 8-Apr-11 9:15am

tom_delorenzo

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OriginalGriff 8-Apr-11 15:25pm

You can't post images anywhere except as your Profile Picture and in Articles - the main reason being that the forums are not moderated, and with some of the idiots we get here, NSFW images would be posted very quickly! Since this could lead to the site becoming unavailable behind corporate firewalls, the rule is: "no pictures, no problem"

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Nish Nishant · Answer 1 · 2011-04-08T10:38:00

Solution 1

Is this Windows 7 by any chance? If so could it be this reported bug?

http://connect.microsoft.com/VisualStudio/feedback/details/518103/bffm-setselection-does-not-work-with-shbrowseforfolder-on-windows-7[^]

Posted 8-Apr-11 10:38am

Nish Nishant

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tom_delorenzo 8-Apr-11 17:37pm

I am on Windows XP

mbue · Answer 2 · 2011-04-08T15:38:00

Solution 2

You can adjust the scroll position inside your callback function:

case BFFM_SELCHANGED:
  if(This->_do_center_selection)
  {
    enum{ IDC_TREE = 0x3741, };
    This->_do_center_selection = This->_keep_center_selection;

    SCROLLINFO      si = {sizeof(SCROLLINFO),SIF_POS|SIF_RANGE|SIF_PAGE, };
    HWND            htree = GetDlgItem(hDlg,IDC_TREE);
    HTREEITEM        htir,htic,htis;
    int              count,pos;
    if(IsWindow(htree))
    {
      htir = TreeView_GetRoot(htree);
      htis = TreeView_GetSelection(htree);
      htic = TreeView_GetChild(htree,htir);
      for(count=pos=0;htic;htic=TreeView_GetNextVisible(htree,htic),count++){ if(htis==htic) pos=count; }
      GetScrollInfo(htree,SB_VERT,&si);
      si.nPage /= 2;
      if((pos>(int)(si.nMin+si.nPage)) && (pos<=(int)(si.nMax-si.nMin-si.nPage)))
      {
        si.nMax = si.nPos - si.nMin + si.nPage;
        for(;pos<si.nMax;pos++) PostMessage(htree,WM_VSCROLL,MAKEWPARAM(SB_LINEUP,0),0);
        for(;pos>si.nMax;pos--) PostMessage(htree,WM_VSCROLL,MAKEWPARAM(SB_LINEDOWN,0),0);
      }
    }
  }
break;

Good luck.

Posted 8-Apr-11 15:38pm

mbue

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tom_delorenzo 12-Apr-11 13:11pm

Thank you. Unfortunately, I cannot get this to compile no matter what I do. I'm not very proficient at C++ so a lot of what goes on behind the scenes is a complete mystery to me. I don't understand what "This->_do_center_selection" means nor do I understand why I can get the argument descriptions for all of the "TreeView_Getxxxx" macros but at the same time get an "error C2065: 'sndmsg' : undeclared identifier" error that points at "htir = TreeView_GetRoot(htree);". Another thing that I find confusing is that I get the error message "error C2660: 'CWnd::PostMessageA' : function does not take 4 parameters" but when I look up Post Message it shows that it takes 4 parameters. Why does it report an error for "PostMessageA" when I have used "PostMessage"?

mbue 13-Apr-11 8:45am

Can you post the code how you have implemented the callback function.
The This variable is a pointer to my class i've casted to from the parameter in the callback function. Put the PostMessage into the global scope (like ::PostMessage). To use the Tree-control macros you have to include #include <commctrl.h>.
Regards.

tom_delorenzo 13-Apr-11 12:45pm

Here's the code (minus the "This->" stuff (which I had no idea what to do with))

int CALLBACK CMergeTab::BrowseCallbackProc(HWND hwnd,UINT uMsg,LPARAM lp, LPARAM pData) { SCROLLINFO si = {sizeof(SCROLLINFO),SIF_POS|SIF_RANGE|SIF_PAGE, }; HTREEITEM htir,htic,htis; int count,pos; switch(uMsg) { case BFFM_INITIALIZED: { if(strlen(NG2_tmpDir) == 0) GetCurrentDirectory(sizeof(NG2_tmpDir)/sizeof(TCHAR),NG2_tmpDir); // WParam is TRUE since you are passing a path. // It would be FALSE if you were passing a pidl. ::SendMessage(hwnd,BFFM_SETSELECTION,TRUE,(LPARAM)NG2_tmpDir); break; } case BFFM_SELCHANGED: { if(strlen(NG2_tmpDir) == 0) { // Set the status window to the currently selected path. if (SHGetPathFromIDList((LPITEMIDLIST) lp ,NG2_tmpDir)) ::SendMessage(hwnd,BFFM_SETSTATUSTEXT,0,(LPARAM)NG2_tmpDir); } // try and get the pre-selected directory to be in the middle of the display panel htir = TreeView_GetRoot(hwnd); htis = TreeView_GetSelection(hwnd); htic = TreeView_GetChild(hwnd,htir); for(count=pos=0;htic;htic=TreeView_GetNextVisible(hwnd,htic),count++) { if(htis==htic) pos=count; } ::GetScrollInfo(hwnd,SB_VERT,&si); si.nPage /= 2; if((pos>(int)(si.nMin+si.nPage)) && (pos<=(int)(si.nMax-si.nMin-si.nPage))) { si.nMax = si.nPos - si.nMin + si.nPage; for(;pos<si.nmax;pos++)>si.nMax;pos--) ::PostMessage(hwnd,WM_VSCROLL,MAKEWPARAM(SB_LINEDOWN,0),0); } break; } default: break; } return 0; }

The following are the error messages I get (at htir = TreeView_GetRoot(hwnd);) error C2065: 'sndmsg' : undeclared identifier error C2440: '=' : cannot convert from ''unknown-type'' to 'HTREEITEM' [all of the TreeView_Getxxxx statements get the C2440 error message]

tom_delorenzo 13-Apr-11 12:48pm

OMG - I'm sorry about the code posting. It is completely unreadable. I've tried putting the code and/or inline code tags around it but it doesn't have much of an effect. Maybe you can cut and paste it where it will show up better. Thanks again. BTW - the #include for commctrl.h was added after the first compilation try. It doesn't seem to have any effect.

mbue 13-Apr-11 15:53pm

substitute the TreeView-macros:


htir = (HTREEITEM)::SendMessage(htree,TVM_GETNEXTITEM,TVGN_ROOT,0);
htis = (HTREEITEM)::SendMessage(htree,TVM_GETNEXTITEM,TVGN_CARET,0);
htic = (HTREEITEM)::SendMessage(htree,TVM_GETNEXTITEM,TVGN_CHILD,(LPARAM)htir);
for(count=pos=0;htic;htic=(HTREEITEM)::SendMessage(htree,TVM_GETNEXTITEM,TVGN_NEXTVISIBLE,(LPARAM)htic),count++){ if(htis==htic) pos=count; }

Good luck.

tom_delorenzo 13-Apr-11 16:23pm

Thanks, that solved the compilation issues. However, during execution, all values (htir, htis, htic, pos and count) end up being zero. Ultimately, no action takes place as we never get to the PostMessage code. Note that where you have htree (defined as htree = GetDlgItem(hDlg,IDC_TREE);) I am using hwnd (the HWND value being passed into the callback). Is that the culprit? I'd have left htree in there but I didn't know what hDlg was defined as and IDC_TREE is defined as a constant (???).

mbue 14-Apr-11 0:43am

hDlg is the window handle of the browse dialog (first parameter). IDC_TREE is constant and the control id of the tree control that displays the folder items.
Regards.

tom_delorenzo 14-Apr-11 12:10pm

I added enum {IDC_TREE = 0x3741,}; and HWND htree = ::GetDlgItem(hwnd,IDC_TREE); and replaced hwnd with htree (as you initially had) in the TreeView macros. I got the same results. Everything returned a zero. Unless you really have a burning desire to see this through to the end I don't think it pays for either of us to spend any more time on it. It was, after all, a cosmetic problem. I really appreciate the time you have spent. Thank you again for your efforts.