private static Win32.IMalloc getShMalloc()
{
var mallocArray1 = new Win32.IMalloc[1];
Win32.Shell32.SHGetMalloc(mallocArray1);
return(mallocArray1[0]);
}
/// <summary>
/// Gets the SH malloc.
/// </summary>
/// <returns></returns>
private static Win32.IMalloc GetSHMalloc()
{
Win32.IMalloc[] mallocArray1 = new Win32.IMalloc[1];
Win32.Shell32.SHGetMalloc( mallocArray1 );
return mallocArray1[0];
}
/// <summary>
/// Shows the folder browser dialog box with the specified owner window.
/// </summary>
public DialogResult ShowDialog(IWin32Window owner)
{
IntPtr pidlRoot = IntPtr.Zero;
// Get/find an owner HWND for this dialog.
IntPtr hWndOwner;
if (owner != null)
{
hWndOwner = owner.Handle;
}
else
{
hWndOwner = Win32.GetActiveWindow();
}
// Get the IDL for the specific startLocation.
Win32.Shell32.SHGetSpecialFolderLocation(hWndOwner, (int)startLocation, out pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
return(DialogResult.Cancel);
}
int mergedOptions = (int)publicOptions | (int)privateOptions;
if ((mergedOptions & (int)Win32.Shell32.BffStyles.NewDialogStyle) != 0)
{
if (System.Threading.ApartmentState.MTA == Application.OleRequired())
{
mergedOptions = mergedOptions & (~(int)Win32.Shell32.BffStyles.NewDialogStyle);
}
}
IntPtr pidlRet = IntPtr.Zero;
try {
// Construct a BROWSEINFO.
Win32.Shell32.BROWSEINFO bi = new Win32.Shell32.BROWSEINFO();
IntPtr buffer = Marshal.AllocHGlobal(MAX_PATH);
bi.pidlRoot = pidlRoot;
bi.hwndOwner = hWndOwner;
bi.pszDisplayName = buffer;
bi.lpszTitle = descriptionText;
bi.ulFlags = mergedOptions;
// The rest of the fields are initialized to zero by the constructor.
// bi.lpfn = null; bi.lParam = IntPtr.Zero; bi.iImage = 0;
// Show the dialog.
pidlRet = Win32.Shell32.SHBrowseForFolder(ref bi);
// Free the buffer you've allocated on the global heap.
Marshal.FreeHGlobal(buffer);
if (pidlRet == IntPtr.Zero)
{
// User clicked Cancel.
return(DialogResult.Cancel);
}
// Then retrieve the path from the IDList.
StringBuilder sb = new StringBuilder(MAX_PATH);
if (0 == Win32.Shell32.SHGetPathFromIDList(pidlRet, sb))
{
return(DialogResult.Cancel);
}
// Convert to a string.
directoryPath = sb.ToString();
} finally {
Win32.IMalloc malloc = GetSHMalloc();
malloc.Free(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
malloc.Free(pidlRet);
}
}
return(DialogResult.OK);
}
