private int _browseCallbackHandler(IntPtr hDlg, int msg, IntPtr lParam, IntPtr lpData)
{
switch (msg)
{
case Win32.BFFM_INITIALIZED:
// remove context help button from dialog caption
int lStyle = Win32.GetWindowLong(hDlg, Win32.GWL_STYLE);
lStyle &= ~Win32.DS_CONTEXTHELP;
Win32.SetWindowLong(hDlg, Win32.GWL_STYLE, lStyle);
lStyle = Win32.GetWindowLong(hDlg, Win32.GWL_EXSTYLE);
lStyle &= ~Win32.WS_EX_CONTEXTHELP;
Win32.SetWindowLong(hDlg, Win32.GWL_EXSTYLE, lStyle);
_adjustUi(hDlg, lpData);
break;
case Win32.BFFM_SELCHANGED:
{
bool ok = false;
StringBuilder sb = new StringBuilder(Win32.MAX_PATH);
if (Win32.SHGetPathFromIDList(lParam, sb))
{
ok = true;
string dir = sb.ToString();
IntPtr hEdit = Win32.GetDlgItem(hDlg, CtlIds.PATH_EDIT);
Win32.SetWindowText(hEdit, dir);
#if UsingStatusText
// We're not using status text, but if we were, this is how you'd set it
Win32.SendMessage(hDlg, Win32.BFFM_SETSTATUSTEXTW, 0, dir);
#endif
#if SHBrowseForFolder_lists_links
// This check doesn't seem to be necessary - the SHBrowseForFolder dirtree doesn't seem to list links
Win32.SHFILEINFO sfi = new Win32.SHFILEINFO();
Win32.SHGetFileInfo(lParam, 0, ref sfi, Marshal.SizeOf(sfi), Win32.SHGFI_PIDL | Win32.SHGFI_ATTRIBUTES);
// fail if pidl is a link
if ((sfi.dwAttributes & Win32.SFGAO_LINK) == Win32.SFGAO_LINK)
{
ok = false;
}
#endif
}
// if invalid selection, disable the OK button
if (!ok)
{
Win32.EnableWindow(Win32.GetDlgItem(hDlg, CtlIds.IDOK), false);
}
break;
}
}
return(0);
}
public DialogResult ShowDialog(IWin32Window owner)
{
InitData initdata = new InitData(this, owner.Handle);
Win32.BROWSEINFO bi = new Win32.BROWSEINFO
{
iImage = 0,
hwndOwner = owner.Handle
};
if (Win32.SHGetSpecialFolderLocation(owner.Handle, (int)RootFolder, ref bi.pidlRoot) != 0)
{
bi.pidlRoot = IntPtr.Zero;
}
bi.lpszTitle = "";
bi.ulFlags = Win32.BIF_RETURNONLYFSDIRS; // do NOT use BIF_NEWDIALOGSTYLE or BIF_STATUSTEXT
if (ShowEditbox)
{
bi.ulFlags |= Win32.BIF_EDITBOX;
}
if (!ShowNewFolderButton)
{
bi.ulFlags |= Win32.BIF_NONEWFOLDERBUTTON;
}
bi.lpfn = _browseCallbackHandler;
// Initialization data, used in _browseCallbackHandler
IntPtr hInit = Marshal.AllocHGlobal(Marshal.SizeOf(initdata));
Marshal.StructureToPtr(initdata, hInit, true);
bi.lParam = hInit;
IntPtr pidlSelectedPath = IntPtr.Zero;
try
{
pidlSelectedPath = Win32.SHBrowseForFolder(ref bi);
StringBuilder sb = new StringBuilder(256);
if (Win32.SHGetPathFromIDList(pidlSelectedPath, sb))
{
SelectedPath = sb.ToString();
return(DialogResult.OK);
}
}
finally
{
// Caller is responsible for freeing this memory.
Marshal.FreeCoTaskMem(pidlSelectedPath);
}
return(DialogResult.Cancel);
}