目的:根据目录内容,建立一个菜单。菜单项为目录中的文件和子目录(以弹出方式显示)。
解决方案:遍历子目录,建立一个文件路径数组。菜单项的ID是数组的索引。当用户单击某个菜单项时,从数组中读取文件路径并执行相应的操作。
细节:
首先,我们需要一个菜单。新建立的菜单将作为此菜单的子菜单。
CMenu* pmenuFavorites=new CMenu;
pmenuFavorites->CreatePopupMenu();
然后读取目录,建立菜单
BuildFavoritesMenu(szPath, 0, pmenuFavorites);
最后,将菜单连接到已有菜单上面去
CMenu* pMenu=m_menuPopup.GetSubMenu(0);
pMenu->ModifyMenu(m_iMenuPosition,MF_BYPOSITION|MF_POPUP| MF_STRING,(UINT)(pmenuFavorites->GetSafeHmenu()),_T("动态菜单"));
pmenuFavorites->Detach();
delete pmenuFavorites;
其它的都很简单,但是建立这个菜单很麻烦
申明一个变量来存文件路径
CStringArray m_astrFavoriteURLs;
int CWorkBenchDlg::BuildMenu(LPCTSTR pszPath, int nStartPos, CMenu* pMenu)
{
CString strPath(pszPath);//path to start from
CString strPath2;//path to start from,with trailing backslash
CString str;//menu item text
WIN32_FIND_DATA wfd;
HANDLE h;
int nPos;
int nEndPos;
int nNewEndPos;
int nLastDir;
TCHAR buf[INTERNET_MAX_PATH_LENGTH];
CStringArray astrFavorites;
CStringArray astrDirs;
CMenu* pSubMenu;
// make sure there's a trailing backslash
if(strPath[strPath.GetLength() - 1] != _T('\\'))
strPath += _T('\\');
strPath2 = strPath;
strPath += _T("*.*");
// now scan the directory, first for files and then for subdirectories
//make a array of full pathnames.
h = FindFirstFile(strPath, &wfd);
if(h != INVALID_HANDLE_VALUE)
{
nEndPos = nStartPos;
do
{
if((wfd.dwFileAttributes & (FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_HIDDEN|FILE_ATTRIBUTE_SYSTEM))==0)
{
str = wfd.cFileName;//file name
lstrcpy(buf,strPath2 + str);//file full pathname
if(str.Right(4) .CompareNoCase(_T(".url"))==0)
{
// an .URL file is formatted just like an .INI file, so we can
// use GetPrivateProfileString() to get the information we want
//fill the buf with URL
::GetPrivateProfileString(_T("InternetShortcut"), _T("URL"),
_T(""), buf, INTERNET_MAX_PATH_LENGTH,
strPath2 + str);
str = str.Left(str.GetLength() - 4);//the name of URL
}
if(str.Right(4) .CompareNoCase( _T(".lnk"))==0)
{
//fill the buf with link target
CGlobal::ResolveShortCut(NULL,strPath2 + str,buf);
str = str.Left(str.GetLength() - 4);
}
//TODO:add other format process here
//这里对.url文件和.lnk文件做了处理,去掉了扩展名。lnk文件的处理参见http://support.microsoft.com/support/kb/articles/Q130/6/98.asp 。可以对其他格式的文件进行处理并更改菜单文字。
// scan through the array and perform an insertion sort
// to make sure the menu ends up in alphabetic order
for(nPos = nStartPos ; nPos < nEndPos ; ++nPos)
{
if(str.CompareNoCase(astrFavorites[nPos]) < 0)
break;
}
astrFavorites.InsertAt(nPos, str);
m_astrFavoriteURLs.InsertAt(nPos, buf);
++nEndPos;
}
} while(FindNextFile(h, &wfd));
FindClose(h);
// Now add these items to the menu
for(nPos = nStartPos ; nPos < nEndPos ; ++nPos)
{
pMenu->AppendMenu(MF_STRING | MF_ENABLED, 0xe00 + nPos, astrFavorites[nPos]);
}
// now that we've got all files, check the subdirectories for more
nLastDir = 0;
h = FindFirstFile(strPath, &wfd);
ASSERT(h != INVALID_HANDLE_VALUE);
do
{
if(wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
// ignore the current and parent directory entries
if(lstrcmp(wfd.cFileName, _T(".")) == 0 || lstrcmp(wfd.cFileName, _T("..")) == 0)
continue;
for(nPos = 0 ; nPos < nLastDir ; ++nPos)
{
if(astrDirs[nPos].CompareNoCase(wfd.cFileName) > 0)
break;
}
pSubMenu = new CMenu;
pSubMenu->CreatePopupMenu();
// call this function recursively.
nNewEndPos = BuildFavoritesMenu(strPath2 + wfd.cFileName, nEndPos, pSubMenu);
if(nNewEndPos != nEndPos)
{
// only intert a submenu if there are in fact files in the subdirectory
nEndPos = nNewEndPos;
pMenu->InsertMenu(nPos, MF_BYPOSITION | MF_POPUP | MF_STRING, (UINT)pSubMenu->m_hMenu, wfd.cFileName);
pSubMenu->Detach();
astrDirs.InsertAt(nPos, wfd.cFileName);
++nLastDir;
}
delete pSubMenu;
}
} while(FindNextFile(h, &wfd));
FindClose(h);
}
return nEndPos;
}
好了,菜单建立完了。万事大吉?没有。还要写命令处理函数。
afx_msg void OnMenu(UINT nID)
{
ShellExecute(NULL,NULL,m_astrFavoriteURLs[nID-0xe00],NULL,NULL,SW_SHOWDEFAULT);
}
和消息映射
……
//}}AFX_MSG_MAP
ON_COMMAND_RANGE(0xe00, 0xfff, OnMenu)
END_MESSAGE_MAP()
这里我使用了0xe00到0xfff作为命令ID的范围,所以最多有512个文件菜单项(够用吗?不够用自己写一个数好了)。因为通常命令的ID大于327xx,所以不会和其他菜单冲突(倒是可能会和按钮ID冲突,自己注意一下资源ID范围就OK啦)。
好了,编译,运行,通过!
唯一的遗憾是没有文件的图标。由于我对操作系统不是很熟悉,不知道怎么才能得到文件的图标并画到菜单上面去。欢迎各方高人指教!
在Windows ME和Visual C++6 SP5下测试通过。