public static String getFileSystemPath(int csidl)
{
IntPtr pIDL = new IntPtr();
int hRes = ShellApi.SHGetSpecialFolderLocation(IntPtr.Zero, (ShellApi.CSIDL)csidl, ref pIDL);
if (hRes != 0)
{
//throw Marshal.ThrowExceptionForHR(hRes);
// TODO exception for hRes
return(null);
}
StringBuilder builder = new StringBuilder(1024);
if (ShellApi.SHGetPathFromIDList(pIDL, builder))
{
return(builder.ToString());
}
else
{
return(null);
}
}
protected override bool RunDialog(IntPtr hWndOwner)
{
bool result = false;
if (_rootFolderLocation == IntPtr.Zero)
{
ShellApi.SHGetSpecialFolderLocation(hWndOwner, (ShellApi.CSIDL) this._rootFolder, ref _rootFolderLocation);
if (_rootFolderLocation == IntPtr.Zero)
{
ShellApi.SHGetSpecialFolderLocation(hWndOwner, 0, ref _rootFolderLocation);
if (_rootFolderLocation == IntPtr.Zero)
{
throw new InvalidOperationException("FolderBrowserDialogNoRootFolder");
}
}
}
_hwndEdit = IntPtr.Zero;
//_uiFlags = 0;
if (_dontIncludeNetworkFoldersBelowDomainLevel)
{
_uiFlags += BrowseFlags.BIF_DONTGOBELOWDOMAIN;
}
if (this._newStyle)
{
_uiFlags += BrowseFlags.BIF_NEWDIALOGSTYLE;
}
if (!this._showNewFolderButton)
{
_uiFlags += BrowseFlags.BIF_NONEWFOLDERBUTTON;
}
if (this._showEditBox)
{
_uiFlags += BrowseFlags.BIF_EDITBOX;
}
if (this._showBothFilesAndFolders)
{
_uiFlags += BrowseFlags.BIF_BROWSEINCLUDEFILES;
}
if (Control.CheckForIllegalCrossThreadCalls && (Application.OleRequired() != ApartmentState.STA))
{
throw new ThreadStateException("DebuggingException: ThreadMustBeSTA");
}
IntPtr pidl = IntPtr.Zero;
IntPtr hglobal = IntPtr.Zero;
try
{
ShellApi.BROWSEINFO browseInfo = new ShellApi.BROWSEINFO();
hglobal = Marshal.AllocHGlobal(MAX_PATH * Marshal.SystemDefaultCharSize);
this._callback = new ShellApi.BrowseCallbackProc(this.FolderBrowserCallback);
browseInfo.pidlRoot = _rootFolderLocation;
browseInfo.hwndOwner = hWndOwner;
browseInfo.pszDisplayName = hglobal;
browseInfo.lpszTitle = this._descriptionText;
browseInfo.ulFlags = _uiFlags;
browseInfo.lpfn = this._callback;
browseInfo.lParam = IntPtr.Zero;
browseInfo.iImage = 0;
pidl = ShellApi.SHBrowseForFolder(ref browseInfo);
if (((_uiFlags & BrowseFlags.BIF_BROWSEFORPRINTER) == BrowseFlags.BIF_BROWSEFORPRINTER) ||
((_uiFlags & BrowseFlags.BIF_BROWSEFORCOMPUTER) == BrowseFlags.BIF_BROWSEFORCOMPUTER))
{
this._selectedPath = Marshal.PtrToStringAuto(browseInfo.pszDisplayName);
result = true;
}
else
{
if (pidl != IntPtr.Zero)
{
StringBuilder pszPath = new StringBuilder(MAX_PATH);
ShellApi.SHGetPathFromIDList(pidl, pszPath);
this._selectedPathNeedsCheck = true;
this._selectedPath = pszPath.ToString();
result = true;
}
}
}
finally
{
ShellApi.IMalloc sHMalloc = GetSHMalloc();
sHMalloc.Free(_rootFolderLocation);
_rootFolderLocation = IntPtr.Zero;
if (pidl != IntPtr.Zero)
{
sHMalloc.Free(pidl);
}
if (hglobal != IntPtr.Zero)
{
Marshal.FreeHGlobal(hglobal);
}
this._callback = null;
}
return(result);
}
private int FolderBrowserCallback(IntPtr hwnd, int msg, IntPtr lParam, IntPtr lpData)
{
switch (msg)
{
case BrowseForFolderMessages.BFFM_INITIALIZED:
if (this._selectedPath.Length != 0)
{
PInvoke.User32.SendMessage(new HandleRef(null, hwnd), BrowseForFolderMessages.BFFM_SETSELECTIONW, 1, this._selectedPath);
if (this._showEditBox && this._showFullPathInEditBox)
{
// get handle to the Edit box inside the Folder Browser Dialog
_hwndEdit = PInvoke.User32.FindWindowEx(new HandleRef(null, hwnd), IntPtr.Zero, "Edit", null);
PInvoke.User32.SetWindowText(_hwndEdit, this._selectedPath);
}
}
break;
case BrowseForFolderMessages.BFFM_IUNKNOWN:
IntPtr iunknown = lParam;
IntPtr iFolderFilterSite;
if (iunknown == IntPtr.Zero)
{
break;
}
System.Runtime.InteropServices.Marshal.QueryInterface(
iunknown,
ref IID_IFolderFilterSite,
out iFolderFilterSite);
Object obj = System.Runtime.InteropServices.Marshal.GetTypedObjectForIUnknown(
iFolderFilterSite,
System.Type.GetType("ShellLib.IFolderFilterSite"));
ShellLib.IFolderFilterSite folderFilterSite = (ShellLib.IFolderFilterSite)obj;
FilterByExtension filter = new FilterByExtension();
filter.ValidExtensions = _validExtensions;
filter.DontExpandZip = _dontExpandZip;
folderFilterSite.SetFilter(filter);
break;
case BrowseForFolderMessages.BFFM_SELCHANGED:
IntPtr pidl = lParam;
if (pidl != IntPtr.Zero)
{
if (((_uiFlags & BrowseFlags.BIF_BROWSEFORPRINTER) == BrowseFlags.BIF_BROWSEFORPRINTER) ||
((_uiFlags & BrowseFlags.BIF_BROWSEFORCOMPUTER) == BrowseFlags.BIF_BROWSEFORCOMPUTER))
{
// we're browsing for a printer or computer, enable the OK button unconditionally.
PInvoke.User32.SendMessage(new HandleRef(null, hwnd), BrowseForFolderMessages.BFFM_ENABLEOK, 0, 1);
}
else
{
//IntPtr pszPath = Marshal.AllocHGlobal(MAX_PATH * Marshal.SystemDefaultCharSize);
StringBuilder pszPath = new StringBuilder(MAX_PATH);
bool haveValidPath = ShellApi.SHGetPathFromIDList(pidl, pszPath);
String displayedPath = pszPath.ToString();
// whether to enable the OK button or not. (if file is valid)
PInvoke.User32.SendMessage(new HandleRef(null, hwnd), BrowseForFolderMessages.BFFM_ENABLEOK, 0, haveValidPath ? 1 : 0);
// Maybe set the Edit Box text to the Full Folder path
if (haveValidPath && !String.IsNullOrEmpty(displayedPath))
{
if (_showEditBox && _showFullPathInEditBox)
{
if (_hwndEdit != IntPtr.Zero)
{
PInvoke.User32.SetWindowText(_hwndEdit, displayedPath);
}
}
if ((_uiFlags & BrowseFlags.BIF_STATUSTEXT) == BrowseFlags.BIF_STATUSTEXT)
{
PInvoke.User32.SendMessage(new HandleRef(null, hwnd), BrowseForFolderMessages.BFFM_SETSTATUSTEXT, 0, displayedPath);
}
}
}
}
break;
}
return(0);
}