Dialog that can remember last selected folder, using MFC


//下面的代码将调出一个选择目录的对话框
BROWSEINFO bi;
char Buffer[MAX_PATH];
bi.hwndOwner = m_hWnd;
bi.pidlRoot = NULL;
bi.pszDisplayName = Buffer;
bi.lpszTitle = "Select drectory";
bi.ulFlags = BIF_RETURNONLYFSDIRS | BIF_NEWDIALOGSTYLE | BIF_VALIDATE;
bi.iImage = 0;

  //注册一个callback,来设定目录选择对话框的初始选择目录
  //这里假设lastpath是用来记录初始选择目录的字串指针
  //即打开选择目录对话框时,默认选择上一回选择的目录

  if (lastpath != NULL)   //该值可以存放于全局变量或存储于配置文件中
  {
   bi.lParam = lastpath; //传给callback的参数,即初始选择的目录路径
  }
  else
  {
      bi.lParam = NULL;
  }

  bi.lpfn = BrowseCallbackProc;   //注册回调函数

LPITEMIDLIST pIDList = SHBrowseForFolder(&bi);  //显示目录选择对话框

if(pIDList)
{
SHGetPathFromIDList(pIDList, Buffer);   //获取用户选择的目录
Global_Free(pIDList);//记得释放pIDList,这里函数名记不太清了,大伙可以查下MSDN
}





//回调函数的实现,主要响应两个消息
inline int CALLBACK BrowseCallbackProc(HWND   hwnd,   UINT   uMsg,   LPARAM   lParam,   LPARAM   lpData)
{
    lParam = lParam;
    switch(uMsg)
    {
    case BFFM_INITIALIZED:  //初始化时,选择我们记录的路径
        {
            ::SendMessage(hwnd,BFFM_SETSELECTION,TRUE,(LPARAM)lpData);
        }
        break;
    case BFFM_SELCHANGED:   //目录选择改变时,记录选择的目录
        {
            ::SendMessage(hwnd,BFFM_SETSTATUSTEXT,0,lpData);  
        }
        break;
    }
    return 0;
}

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