private Win32API.IMalloc GetSHMalloc()
{
var ppMalloc = new Win32API.IMalloc[1];
Win32API.Shell32.SHGetMalloc(ppMalloc);
return(ppMalloc[0]);
}
/// <summary>
///
/// </summary>
/// <param name="hwndOwner"></param>
/// <returns></returns>
protected override bool RunDialog(System.IntPtr hwndOwner)
{
IntPtr ptr1 = IntPtr.Zero;
bool flag1 = false;
Win32API.SHGetSpecialFolderLocation(hwndOwner, (int)m_rootFolder, ref ptr1);
if (ptr1 == IntPtr.Zero)
{
Win32API.SHGetSpecialFolderLocation(hwndOwner, 0, ref ptr1);
if (ptr1 == IntPtr.Zero)
{
throw new Exception("FolderBrowserDialogNoRootFolder");
}
}
//Initialize the OLE to current thread.
Application.OleRequired();
IntPtr ptr2 = IntPtr.Zero;
try
{
Win32API.BROWSEINFO browseinfo1 = new Win32API.BROWSEINFO();
IntPtr ptr3 = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
IntPtr ptr4 = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
Win32API.BrowseCallbackProc proc1 = new Win32API.BrowseCallbackProc(this.FolderBrowserDialog_BrowseCallbackProc);
browseinfo1.pidlRoot = ptr1;
browseinfo1.hwndOwner = hwndOwner;
browseinfo1.pszDisplayName = ptr3;
browseinfo1.lpszTitle = m_descriptionText;
browseinfo1.ulFlags = 0x40;
browseinfo1.lpfn = proc1;
browseinfo1.lParam = IntPtr.Zero;
browseinfo1.iImage = 0;
ptr2 = Win32API.SHBrowseForFolder(browseinfo1);
string s = Marshal.PtrToStringAuto(ptr3);
if (ptr2 != IntPtr.Zero)
{
Win32API.SHGetPathFromIDList(ptr2, ptr4);
this.m_selectedPath = Marshal.PtrToStringAuto(ptr4);
Marshal.FreeHGlobal(ptr4);
Marshal.FreeHGlobal(ptr3);
flag1 = true;
}
}
finally
{
Win32API.IMalloc malloc1 = GetSHMalloc();
malloc1.Free(ptr1);
if (ptr2 != IntPtr.Zero)
{
malloc1.Free(ptr2);
}
}
return(flag1);
}
/// <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 = Win32API.GetActiveWindow();
}
// Get the IDL for the specific startLocation.
Win32API.Shell32.SHGetSpecialFolderLocation(hWndOwner, (int)startLocation, out pidlRoot);
if (pidlRoot == IntPtr.Zero)
{
return(DialogResult.Cancel);
}
int mergedOptions = (int)publicOptions | (int)privateOptions;
if ((mergedOptions & (int)Win32API.Shell32.BffStyles.NewDialogStyle) != 0)
{
if (System.Threading.ApartmentState.MTA == Application.OleRequired())
{
mergedOptions = mergedOptions & (~(int)Win32API.Shell32.BffStyles.NewDialogStyle);
}
}
IntPtr pidlRet = IntPtr.Zero;
try
{
// Construct a BROWSEINFO.
Win32API.Shell32.BROWSEINFO bi = new Win32API.Shell32.BROWSEINFO();
IntPtr buffer = Marshal.AllocHGlobal(MAX_PATH);
bi.pidlRoot = pidlRoot;
bi.hwndOwner = hWndOwner;
bi.pszDisplayName = buffer;
bi.lpszTitle = Description;
bi.ulFlags = mergedOptions;
bi.lpfn = new Win32API.Shell32.BFFCALLBACK(callback);
// The rest of the fields are initialized to zero by the constructor.
// bi.lParam = IntPtr.Zero; bi.iImage = 0;
// Show the dialog.
pidlRet = Win32API.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 == Win32API.Shell32.SHGetPathFromIDList(pidlRet, sb))
{
return(DialogResult.Cancel);
}
// Convert to a string.
SelectedPath = sb.ToString();
}
finally
{
Win32API.IMalloc malloc = GetSHMalloc();
malloc.Free(pidlRoot);
if (pidlRet != IntPtr.Zero)
{
malloc.Free(pidlRet);
}
}
return(DialogResult.OK);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
private Win32API.IMalloc GetSHMalloc()
{
Win32API.IMalloc[] mallocArray1 = new Win32API.IMalloc[1];
Win32API.SHGetMalloc(mallocArray1);
return(mallocArray1[0]);
}
