protected override bool RunDialog(IntPtr hWndOwner)
{
IntPtr zero = IntPtr.Zero;
bool flag = false;
NativeMethods.SHGetSpecialFolderLocation(hWndOwner, (int)this.rootFolder, ref zero);
if (zero == IntPtr.Zero)
{
NativeMethods.SHGetSpecialFolderLocation(hWndOwner, 0, ref zero);
if (zero == IntPtr.Zero)
{
throw new InvalidOperationException("FolderBrowserDialogNoRootFolder");
}
}
int num = 0x40;
if (!this.showNewFolderButton)
{
num += 0x200;
}
IntPtr pidl = IntPtr.Zero;
IntPtr hglobal = IntPtr.Zero;
IntPtr pszPath = IntPtr.Zero;
try
{
NativeMethods.BROWSEINFO lpbi = new NativeMethods.BROWSEINFO();
hglobal = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
pszPath = Marshal.AllocHGlobal((int)(260 * Marshal.SystemDefaultCharSize));
this.callback = new BrowseCallbackProc(this.FolderBrowserDialog_BrowseCallbackProc);
lpbi.pidlRoot = zero;
lpbi.hwndOwner = hWndOwner;
lpbi.pszDisplayName = hglobal;
lpbi.lpszTitle = this.descriptionText;
lpbi.ulFlags = num;
lpbi.lpfn = this.callback;
lpbi.lParam = IntPtr.Zero;
lpbi.iImage = 0;
pidl = NativeMethods.SHBrowseForFolder(lpbi);
if (pidl != IntPtr.Zero)
{
NativeMethods.SHGetPathFromIDList(pidl, pszPath);
this.selectedPathNeedsCheck = true;
this.selectedPath = Marshal.PtrToStringAuto(pszPath);
flag = true;
}
}
finally
{
NativeMethods.IMalloc sHMalloc = GetSHMalloc();
sHMalloc.Free(zero);
if (pidl != IntPtr.Zero)
{
sHMalloc.Free(pidl);
}
if (pszPath != IntPtr.Zero)
{
Marshal.FreeHGlobal(pszPath);
}
if (hglobal != IntPtr.Zero)
{
Marshal.FreeHGlobal(hglobal);
}
this.callback = null;
}
return(flag);
}
public static extern IntPtr SHBrowseForFolder(ref NativeMethods.BROWSEINFO lpbi);
