private string SelectFolder(string caption, string initialPath, IntPtr parentHandle)
{
this.initialPath = initialPath;
StringBuilder sb = new StringBuilder(256);
IntPtr bufferAddress = Marshal.AllocHGlobal(256);;
IntPtr pidl = IntPtr.Zero;
var bi = new BROWSEINFO();
bi.hwndOwner = parentHandle;
bi.pidlRoot = IntPtr.Zero;
bi.lpszTitle = caption;
bi.ulFlags = Shell32.BIF_NEWDIALOGSTYLE | Shell32.BIF_SHAREABLE;
bi.lpfn = new BrowseCallBackProc(OnBrowseEvent);
bi.lParam = IntPtr.Zero;
bi.iImage = 0;
try
{
pidl = Shell32.SHBrowseForFolder(ref bi);
if (true != Shell32.SHGetPathFromIDList(pidl, bufferAddress))
{
return(null);
}
sb.Append(Marshal.PtrToStringAuto(bufferAddress));
}
finally
{
// Caller is responsible for freeing this memory.
Marshal.FreeCoTaskMem(pidl);
}
return(sb.ToString());
}
/// <summary>
/// Displays the "open folder" dialog and returns the selected path name.
/// </summary>
/// <param name="title">Title of dialog.</param>
/// <returns>The path of selected folder.</returns>
public static string OpenFolderDialog(string title)
{
var lpbi = new BrowseInfo
{
lpszTitle = title,
ulFlags = BIFlags.BIF_RETURNONLYFSDIRS
};
var pidl = Shell32.SHBrowseForFolder(lpbi);
var pszPath = new char[256];
if (Shell32.SHGetPathFromIDList(pidl, pszPath))
{
var fdrPath = new string(pszPath);
return(fdrPath.Substring(0, fdrPath.IndexOf('\0')));
}
return(string.Empty);
}
private void btnBrowseMachine_Click(object sender, EventArgs e)
{
IntPtr pidlRet = IntPtr.Zero;
IntPtr pidlRoot = IntPtr.Zero;
Shell32.SHGetSpecialFolderLocation(this.Handle, (int)Shell32.FolderID.NetworkNeighborhood, out pidlRoot);
try
{
Shell32.BROWSEINFO bi = new Shell32.BROWSEINFO();
IntPtr buffer = Marshal.AllocHGlobal(Win32Utils.MAX_PATH);
bi.hwndOwner = this.Handle;
bi.pidlRoot = pidlRoot;
bi.lpszTitle = "Browse for Machine";
bi.pszDisplayName = buffer;
bi.ulFlags = (int)(Shell32.BrowseInfoFlags.BIF_BROWSEFORCOMPUTER |
Shell32.BrowseInfoFlags.BIF_NONEWFOLDERBUTTON);
pidlRet = Shell32.SHBrowseForFolder(ref bi);
if (pidlRet != IntPtr.Zero)
{
string machineName = Marshal.PtrToStringAuto(bi.pszDisplayName).ToUpper();
cboMachine.Text = machineName;
InsertRecentMachine(machineName);
}
// Free the buffer we've allocated on the global heap
Marshal.FreeHGlobal(buffer);
}
finally
{
Shell32.IMalloc malloc;
Shell32.SHGetMalloc(out malloc);
malloc.Free(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
malloc.Free(pidlRet);
}
}
}
/// <summary>
/// Displays the folder browser dialog.
/// </summary>
/// <param name="hwndOwner">Handle to the window that owns the dialog box.</param>
/// <returns>
/// If the user clicks the OK button of the dialog that is displayed, true is returned; otherwise, false.
/// </returns>
protected override bool RunDialog(IntPtr hwndOwner)
{
var result = false;
IntPtr pidlRoot = IntPtr.Zero,
pszPath = IntPtr.Zero,
pidlSelected = IntPtr.Zero;
SelectedPath = string.Empty;
try
{
if (UseSpecialFolderRoot)
{
Shell32.SHGetFolderLocation(hwndOwner, (int)RootSpecialFolder, IntPtr.Zero, 0, out pidlRoot);
}
else // RootType == Path
{
uint iAttribute;
Shell32.SHParseDisplayName(RootPath, IntPtr.Zero, out pidlRoot, 0, out iAttribute);
}
var browseInfo = new BrowseInfo
{
HwndOwner = hwndOwner,
Root = pidlRoot,
DisplayName = new string(' ', 256),
Title = Title,
Flags = _dialogOptions,
LParam = 0,
Callback = HookProc
};
// Show dialog
pidlSelected = Shell32.SHBrowseForFolder(ref browseInfo);
if (pidlSelected != IntPtr.Zero)
{
result = true;
pszPath = Marshal.AllocHGlobal(260 * Marshal.SystemDefaultCharSize);
Shell32.SHGetPathFromIDList(pidlSelected, pszPath);
SelectedPath = Marshal.PtrToStringAuto(pszPath);
}
}
finally // release all unmanaged resources
{
var malloc = 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);
}
