public string SelectOutDir()
        {
            OpenDialogDir ofn2 = new OpenDialogDir();

            ofn2.pszDisplayName = new string(new char[2000]);; // 存放目录路径缓冲区  
            ofn2.lpszTitle      = "Open Project";              // 标题  
                                                               //ofn2.ulFlags = BIF_NEWDIALOGSTYLE | BIF_EDITBOX; // 新的样式,带编辑框  
            IntPtr pidlPtr = DllOpenFileDialog.SHBrowseForFolder(ofn2);

            char[] charArray = new char[2000];
            for (int i = 0; i < 2000; i++)
            {
                charArray[i] = '\0';
            }

            DllOpenFileDialog.SHGetPathFromIDList(pidlPtr, charArray);
            string fullDirPath = new String(charArray);

            fullDirPath = fullDirPath.Substring(0, fullDirPath.IndexOf('\0'));
            return(fullDirPath);
        }
 public static extern IntPtr SHBrowseForFolder([In, Out] OpenDialogDir ofn);