public static extern IntPtr SHBrowseForFolder([In] UnsafeNativeMethods.BROWSEINFO lpbi);
/// <summary>
/// When overridden in a derived class, specifies a common dialog box.
/// </summary>
/// <param name="hwndOwner">A value that represents the window handle of the owner window for the common dialog box.</param>
/// <returns>true if the dialog box was successfully run; otherwise, false.</returns>
protected override bool RunDialog(IntPtr hwndOwner)
{
IntPtr root = IntPtr.Zero;
bool flag = false;
UnsafeNativeMethods.Shell32.SHGetSpecialFolderLocation(hwndOwner, (int)Environment.SpecialFolder.Desktop, ref root);
int browseInfoFlags = NativeMethods.BIF_NEWDIALOGSTYLE;
if (!_showNewFolderButton)
{
browseInfoFlags += NativeMethods.BIF_NONEWFOLDERBUTTON;
}
IntPtr pidl = IntPtr.Zero;
IntPtr hglobal = IntPtr.Zero;
IntPtr pszPath = IntPtr.Zero;
try
{
hglobal = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
pszPath = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
_callback = new UnsafeNativeMethods.BrowseCallbackProc(OnBrowseCallbackProc);
UnsafeNativeMethods.BROWSEINFO lpbi = new UnsafeNativeMethods.BROWSEINFO();
lpbi.pidlRoot = root;
lpbi.hwndOwner = hwndOwner;
lpbi.pszDisplayName = hglobal;
lpbi.lpszTitle = _descriptionText;
lpbi.ulFlags = browseInfoFlags;
lpbi.lpfn = _callback;
lpbi.lParam = IntPtr.Zero;
lpbi.iImage = 0;
pidl = UnsafeNativeMethods.Shell32.SHBrowseForFolder(lpbi);
if (pidl != IntPtr.Zero)
{
UnsafeNativeMethods.Shell32.SHGetPathFromIDList(pidl, pszPath);
_selectedPathNeedsCheck = true;
_selectedPath = Marshal.PtrToStringAuto(pszPath);
flag = true;
}
}
finally
{
UnsafeNativeMethods.IMalloc sHMalloc = GetSHMalloc();
sHMalloc.Free(root);
if (pidl != IntPtr.Zero)
sHMalloc.Free(pidl);
if (pszPath != IntPtr.Zero)
Marshal.FreeHGlobal(pszPath);
if (hglobal != IntPtr.Zero)
Marshal.FreeHGlobal(hglobal);
_callback = null;
}
return flag;
}