public static string Show(IWin32Window owner, string title, BrowseForFolderOptions options)
{
NativeMethods.BROWSEINFO mbif = new NativeMethods.BROWSEINFO();
mbif.hwndOwner = owner == null ? IntPtr.Zero : owner.Handle;
mbif.lpfn = IntPtr.Zero;
mbif.lpszTitle = title;
mbif.ulFlags = (uint)options;
int itemlstptr = 0;
itemlstptr = NativeMethods.SHBrowseForFolder(mbif);
IntPtr sourcePath = Marshal.AllocCoTaskMem(256);
bool bRes = false;
string dirPath = null;
if (itemlstptr >= 0)
{
bRes = NativeMethods.SHGetPathFromIDList(itemlstptr, sourcePath);
dirPath = Marshal.PtrToStringAnsi(sourcePath);
}
Marshal.FreeCoTaskMem(sourcePath);
if (dirPath != null && dirPath.Trim() == "")
{
dirPath = null;
}
return(dirPath);
}
private async Task<StorageFolder> PickSingleFolderAsyncImpl()
{
NativeMethods.BROWSEINFO pbi = new NativeMethods.BROWSEINFO();
pbi.ulFlags = 0x41;
pbi.pszDisplayName = new string('\0', 256);
IntPtr pidl = NativeMethods.SHBrowseForFolder(ref pbi);
if(pidl != IntPtr.Zero)
{
IntPtr pathp = Marshal.AllocHGlobal(256);
bool success = NativeMethods.SHGetPathFromIDList(pidl, pathp);
Marshal.FreeCoTaskMem(pidl);
if (success)
{
string path = Marshal.PtrToStringAnsi(pathp);
Marshal.FreeHGlobal(pathp);
return new StorageFolder(path);
}
}
return null;
}
private async Task <StorageFolder> DoPickSingleFolderAsync()
{
NativeMethods.BROWSEINFO pbi = new NativeMethods.BROWSEINFO();
pbi.ulFlags = 0x41;
pbi.pszDisplayName = new string('\0', 256);
IntPtr pidl = NativeMethods.SHBrowseForFolder(ref pbi);
if (pidl != IntPtr.Zero)
{
IntPtr pathp = Marshal.AllocHGlobal(256);
bool success = NativeMethods.SHGetPathFromIDList(pidl, pathp);
Marshal.FreeCoTaskMem(pidl);
if (success)
{
string path = Marshal.PtrToStringAnsi(pathp);
Marshal.FreeHGlobal(pathp);
return(new StorageFolder(path));
}
}
return(null);
}
private DialogResult ShowNativeDialog(IWin32Window owner)
{
var rootFolder = IntPtr.Zero;
NativeMethods.SHGetSpecialFolderLocation(owner.Handle, (int)RootFolder, ref rootFolder);
if (rootFolder == IntPtr.Zero)
{
NativeMethods.SHGetSpecialFolderLocation(owner.Handle, (int)Environment.SpecialFolder.Desktop, ref rootFolder);
if (rootFolder == IntPtr.Zero)
{
throw new InvalidOperationException("Cannot resolve root folder");
}
}
uint options = NativeMethods.BIF_NEWDIALOGSTYLE;
if (ShowEditBox)
{
options |= NativeMethods.BIF_EDITBOX;
}
if (!ShowNewFolderButton)
{
options |= NativeMethods.BIF_NONEWFOLDERBUTTON;
}
var result = IntPtr.Zero;
var displayName = IntPtr.Zero;
var selectedPath = IntPtr.Zero;
try
{
var bi = new NativeMethods.BROWSEINFO();
displayName = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
selectedPath = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
bi.pidlRoot = rootFolder;
bi.hwndOwner = owner.Handle;
bi.pszDisplayName = displayName;
bi.lpszTitle = Description;
bi.ulFlags = options;
result = NativeMethods.SHBrowseForFolder(bi);
if (result != IntPtr.Zero)
{
NativeMethods.SHGetPathFromIDList(result, selectedPath);
SelectedPath = Marshal.PtrToStringAuto(selectedPath);
return(DialogResult.OK);
}
return(DialogResult.Cancel);
}
finally
{
NativeMethods.CoTaskMemFree(rootFolder);
if (result != IntPtr.Zero)
{
NativeMethods.CoTaskMemFree(result);
}
if (selectedPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(selectedPath);
}
if (displayName != IntPtr.Zero)
{
Marshal.FreeHGlobal(displayName);
}
}
}
protected override bool RunDialog(IntPtr hwndOwner)
{
bool result = false;
IntPtr pidlRoot = IntPtr.Zero,
pszPath = IntPtr.Zero,
pidlSelected = IntPtr.Zero;
SelectedPath = string.Empty;
try
{
if (RootType == RootType.SpecialFolder)
{
NativeMethods.SHGetFolderLocation(hwndOwner, (int)RootSpecialFolder, IntPtr.Zero, 0, out pidlRoot);
}
else // RootType == Path
{
uint iAttribute;
NativeMethods.SHParseDisplayName(RootPath, IntPtr.Zero, out pidlRoot, 0, out iAttribute);
}
var browseInfo = new NativeMethods.BROWSEINFO
{
HwndOwner = hwndOwner,
Root = pidlRoot,
DisplayName = new string(' ', 256),
Title = Title,
Flags = (uint)_dialogOptions,
LParam = 0,
Callback = HookProc
};
// Show dialog
pidlSelected = NativeMethods.SHBrowseForFolder(ref browseInfo);
if (pidlSelected != IntPtr.Zero)
{
result = true;
pszPath = Marshal.AllocHGlobal(260 * Marshal.SystemDefaultCharSize);
NativeMethods.SHGetPathFromIDList(pidlSelected, pszPath);
SelectedPath = Marshal.PtrToStringAuto(pszPath);
}
}
finally // release all unmanaged resources
{
NativeMethods.IMalloc malloc = NativeMethods.GetSHMalloc();
if (pidlRoot != IntPtr.Zero)
{
malloc.Free(pidlRoot);
}
if (pidlSelected != IntPtr.Zero)
{
malloc.Free(pidlSelected);
}
if (pszPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszPath);
}
Marshal.ReleaseComObject(malloc);
}
return(result);
}
protected override bool RunDialog(IntPtr hwndOwner)
{
bool result = false;
IntPtr pidlRoot = IntPtr.Zero,
pszPath = IntPtr.Zero,
pidlSelected = IntPtr.Zero;
SelectedPath = string.Empty;
try
{
if (RootType == RootType.SpecialFolder)
{
NativeMethods.SHGetFolderLocation(hwndOwner, (int) RootSpecialFolder, IntPtr.Zero, 0, out pidlRoot);
}
else // RootType == Path
{
uint iAttribute;
NativeMethods.SHParseDisplayName(RootPath, IntPtr.Zero, out pidlRoot, 0, out iAttribute);
}
var browseInfo = new NativeMethods.BROWSEINFO
{
HwndOwner = hwndOwner,
Root = pidlRoot,
DisplayName = new string(' ', 256),
Title = Title,
Flags = (uint) _dialogOptions,
LParam = 0,
Callback = HookProc
};
// Show dialog
pidlSelected = NativeMethods.SHBrowseForFolder(ref browseInfo);
if (pidlSelected != IntPtr.Zero)
{
result = true;
pszPath = Marshal.AllocHGlobal(260*Marshal.SystemDefaultCharSize);
NativeMethods.SHGetPathFromIDList(pidlSelected, pszPath);
SelectedPath = Marshal.PtrToStringAuto(pszPath);
}
}
finally // release all unmanaged resources
{
NativeMethods.IMalloc malloc = NativeMethods.GetSHMalloc();
if (pidlRoot != IntPtr.Zero)
{
malloc.Free(pidlRoot);
}
if (pidlSelected != IntPtr.Zero)
{
malloc.Free(pidlSelected);
}
if (pszPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszPath);
}
Marshal.ReleaseComObject(malloc);
}
return result;
}
private DialogResult ShowNativeDialog(IWin32Window owner)
{
var rootFolder = IntPtr.Zero;
NativeMethods.SHGetSpecialFolderLocation(owner.Handle, (int)RootFolder, ref rootFolder);
if (rootFolder == IntPtr.Zero)
{
NativeMethods.SHGetSpecialFolderLocation(owner.Handle, (int)Environment.SpecialFolder.Desktop, ref rootFolder);
if (rootFolder == IntPtr.Zero)
throw new InvalidOperationException("Cannot resolve root folder");
}
uint options = NativeMethods.BIF_NEWDIALOGSTYLE;
if (ShowEditBox)
options |= NativeMethods.BIF_EDITBOX;
if (!ShowNewFolderButton)
options |= NativeMethods.BIF_NONEWFOLDERBUTTON;
var result = IntPtr.Zero;
var displayName = IntPtr.Zero;
var selectedPath = IntPtr.Zero;
try
{
var bi = new NativeMethods.BROWSEINFO();
displayName = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
selectedPath = Marshal.AllocHGlobal(NativeMethods.MAX_PATH * Marshal.SystemDefaultCharSize);
bi.pidlRoot = rootFolder;
bi.hwndOwner = owner.Handle;
bi.pszDisplayName = displayName;
bi.lpszTitle = Description;
bi.ulFlags = options;
result = NativeMethods.SHBrowseForFolder(bi);
if (result != IntPtr.Zero)
{
NativeMethods.SHGetPathFromIDList(result, selectedPath);
SelectedPath = Marshal.PtrToStringAuto(selectedPath);
return DialogResult.OK;
}
return DialogResult.Cancel;
}
finally
{
NativeMethods.CoTaskMemFree(rootFolder);
if (result != IntPtr.Zero)
NativeMethods.CoTaskMemFree(result);
if (selectedPath != IntPtr.Zero)
Marshal.FreeHGlobal(selectedPath);
if (displayName != IntPtr.Zero)
Marshal.FreeHGlobal(displayName);
}
}
