Re: SHSimpleIDListFromPath Fails, GetLastError()=126

I'm guessing it has something to do with the string you are passing through
not really being a wide string as you are casting. The function you're
calling is always wanting a pointer to a constant wide string so you could
prefix with L"C:\\MYDIR\\". I think it's a fluke that the others worked
(or maybe you didn't do break point on them or something). Note difference
here. I always use Unicode for any program that uses SHfunctions and mostly
Unicode for all programs these days. Even so, the string is ANSI unless you
cast it. Using the _T() macro wouldn't work here because these functions
always want wide chars.


This is the function I use for browsing folders. I use MFC so some of this
has some code for that in it, but ... note that you can set the initial
folder in the BROWSEINFO object. I'm not sure if this is what you're trying
to do or not. I just set root to NULL (always starting at the top) but you
could modify this to add that functionality pretty easily (and I think I may
do that as well now that I think of it).

Tom

//
// SetSelProc
// Callback procedure to set the initial selection of the browser.
int CALLBACK SetSelProc( HWND hWnd, UINT uMsg, LPARAM lParam, LPARAM
lpData )
{
    switch(uMsg) {
        case BFFM_INITIALIZED:
        {
            // Set start directory
            ::SendMessage( hWnd, BFFM_SETSELECTION, TRUE, lpData );
            // Remove the ? from the caption
            DWORD dwStyle = ::GetWindowLong(hWnd, GWL_EXSTYLE);
            ::SetWindowLong(hWnd, GWL_EXSTYLE, dwStyle &
~WS_EX_CONTEXTHELP);
        }
        break;

        case BFFM_SELCHANGED:
        {
            // Set the window text to the path
            TCHAR szText[MAX_PATH] = {0};
            ::SHGetPathFromIDList(reinterpret_cast<LPITEMIDLIST>(lParam),
szText);
        ::SetWindowText(hWnd,szText);
        }
        break;

        case BFFM_VALIDATEFAILED:
        // Msg("\"%s\" is a wrong path name.",
reinterpret_cast<LPTSTR>(lParam));
        return 1;
    }
    return 0;
}

//
// FolderBrowswer
// Display a folder browser allowing the user to browse for a directory.
//
BOOL FolderBrowser(CWnd *pWnd, CString& title, CString& dir, CString
&initial, BOOL bAll, BOOL bCreate)
{
    BOOL r = FALSE;
    LPMALLOC pMalloc;
    TCHAR buffer[MAX_PATH]; // Retrieve the task memory allocator.
    if (SUCCEEDED(::SHGetMalloc(&pMalloc))) {

        // Fill in a BROWSEINFO structure, setting the flag toindicate
        // that we are only interested in file systemdirectories.
        BROWSEINFO bi;
        ZeroMemory(&bi,sizeof(BROWSEINFO));
        bi.hwndOwner = pWnd->GetSafeHwnd();
        bi.pidlRoot = NULL;
        bi.pszDisplayName = NULL;
        bi.lpszTitle = (LPCTSTR) title;
        if(!bAll)
            bi.ulFlags = BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS |
BIF_DONTGOBELOWDOMAIN;
        else
            bi.ulFlags = BIF_RETURNFSANCESTORS | BIF_RETURNONLYFSDIRS;

        if(bCreate)
            bi.ulFlags |= BIF_NEWDIALOGSTYLE;

        bi.iImage = 0;
        bi.lpfn = SetSelProc;
        bi.lParam = (LPARAM)(LPCTSTR)initial;

        // Display the browser.
        LPITEMIDLIST item_list = ::SHBrowseForFolder(&bi);

        // If the user selected a folder...
        if (item_list) {
            // Convert the item ID to a pathname, and copy it to the
            // out parameter.
            if (::SHGetPathFromIDList(item_list, buffer)) {
                dir = buffer;
                dir = AddSlash(dir);
                r = TRUE;
            }
            // Free the PIDL allocated by SHBrowseForFolder
            pMalloc->Free(item_list);
        } // Release the shell's allocator
        pMalloc->Release();
    }
    return r;
}

Tom

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