仿Explorer的目录树视图类_系统软件_学习笔记★闵涛★计算机学习电脑编程软硬件技巧


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仿Explorer的目录树视图类

作者：闵涛文章来源：闵涛的学习笔记点击数：4152 更新时间：2009/4/25 0:44:57

{
CTreeCtrl* pCtrl = (CTreeCtrl*) lParamSort;

LPFOLDERNODE lpfn1 = (LPFOLDERNODE)lParam1;
LPFOLDERNODE lpfn2 = (LPFOLDERNODE)lParam2;
if(lpfn1 == NULL || lpfn2 == NULL) return 0;

// 虚拟文件夹排在前面,并且不改变原顺序
if((lpfn1->dwAttributes & SFGAO_FILESYSTEM) == 0 &&
  (lpfn2->dwAttributes & SFGAO_FILESYSTEM) == 0)
  return 0;
else if((lpfn1->dwAttributes & SFGAO_FILESYSTEM) == 0)
  return -1;
else if((lpfn2->dwAttributes & SFGAO_FILESYSTEM)==0)
  return 1;
// 真正的文件夹排在虚拟文件夹之后,且按字母顺序(不区分大小写)
else if((lpfn1->dwAttributes & SFGAO_FOLDER) &&
  (lpfn1->dwAttributes & SFGAO_FOLDER))
  return stricmp(lpfn1->cPath, lpfn2->cPath);
else if(lpfn1->dwAttributes & SFGAO_FOLDER)
  return -1;
else if(lpfn2->dwAttributes & SFGAO_FOLDER)
  return 1;
else
  // 其它的排在最后面,按字母序(不区分大小写)
  return stricmp(lpfn1->cPath, lpfn2->cPath);
}

// AttachFolders unconditionally attaches child folders to the
// node passed in Node. If there are any, it also starts a thread
// to watch for changes in the tree structure.
BOOL CShellFolderView::AttachFolders(HTREEITEM hNode)
{
CWaitCursor cur; // 显示等待光标
BOOL bRet = FALSE;

BOOL bChildren = TRUE;
CTreeCtrl& tree = GetTreeCtrl();
tree.SetRedraw(FALSE); // 禁止控件更新窗口,以免插入时闪烁
//tree.EnableWindow(FALSE);

CString strPath = GetPath(hNode); // The full path for the node.
LPFOLDERNODE lpfn = (LPFOLDERNODE)tree.GetItemData(hNode);

// If the node being expanded is a root, get the volume serial number
// and lop off the backslash.
if(strPath.GetLength() <= 3)
{
lpfn->Vol_Ser = GetVol_Ser(strPath);
}

// Enumerate the folder''''s contents.
IEnumIDList*    pEnum = NULL;
if(lpfn->pShellFolder->EnumObjects(m_hWnd, SHCONTF_FOLDERS | SHCONTF_INCLUDEHIDDEN,
  &pEnum) == NOERROR)
{
  bChildren = FALSE;
  pEnum->Reset();      // Reset the enumerate interface
  ULONG   u = 1;       // Enumerate context.
  LPITEMIDLIST   lpidlChild = NULL;
  while(pEnum->Next(1, &lpidlChild, &u) == NOERROR)
  {
   // 为每个PIDL创建对应的树结点(包含其中的虚拟文件夹)
   HTREEITEM hChild = CreateFolderNode(lpidlChild, hNode, TRUE);
   // 释放PIDL
   m_pMalloc->Free(lpidlChild);
   if(hChild != NULL)
   {
    // 调整结点的类型
    bChildren = TRUE;
    LPFOLDERNODE lpfnChild = (LPFOLDERNODE)tree.GetItemData(hChild);
    switch(lpfnChild->fType)
    {
    case ftMyComputer:
    case ftNetNode:
     lpfnChild->Vol_Ser = GetVol_Ser(lpfnChild->cPath);
     break;
    default:
     lpfnChild->Vol_Ser = lpfn->Vol_Ser;
     bRet = TRUE;
     break;
    }
   }
  }
  // 释放枚举接口
  pEnum->Release();
}
// 调整父结点的属性
TVITEM tvi;
tvi.mask = TVIF_CHILDREN;
tvi.cChildren = bChildren?1:0;
tvi.hItem = hNode;
tree.SetItem(&tvi);

// Alphabetize the nodes, unless the parent is MyComputer or
// Network Neighborhood.
switch(lpfn->fType)
{
case ftMyComputer:
case ftNetworkNeighborhood:
  break;
default:{   // 排序所有子结点(根据给定的回调函数)
  TVSORTCB tvs;
  tvs.hParent = hNode;
  tvs.lpfnCompare = ShortItemProc;
  tvs.lParam = (LPARAM)&tree;
  tree.SortChildrenCB(&tvs);
  }break;
}

if(bRet)
{
  // 如果还没有的话,则启动一个线程,开始监视该文件夹的变化
  if(lpfn->pMonitorThread == NULL)
  {
   lpfn->pMonitorThread = new CFolderChangeMonitor(strPath, m_hWnd, (WPARAM)hNode);
  }
}

// 可以更新窗口了
tree.SetRedraw(TRUE);
// tree.EnableWindow(TRUE);
return bRet;
}

// This routine is used only for diskettes. It returns the volume serial
// number of a disk in the drive--if there is no disk there, it returns
// -1. It''''s used whenever the user clicks on a node, to determine whether
// he has swapped diskettes, necessitating a discard of all nodes for the
// affected drive.
// For volumes other than diskettes, it returns a dummy value of 1,
// as -1 is used to signify a diskette drive that isn''''t loaded.
LONG CShellFolderView::GetVol_Ser(LPCTSTR strDriver)
{
LONG result = -1;

// If there is no path it''''s My Computer -- exit now
if(strlen(strDriver) == 0)
return result;

// If the driver isn''''t removeable, we dont have to do this
CString strPath = strDriver[0] + ":\\";
strPath.MakeLower();

if(::GetDriveType(strPath) != DRIVE_REMOVABLE)
{
  result = 1;
  return result;
}
// I f there''''s no disk in the drive, bail out with a result = -1.
DWORD dwVSN, dwMCL, dwFSF;
if(GetVolumeInformation(strPath, NULL, 0, &dwVSN, &dwMCL, &dwFSF, NULL, 0))
{
  result = (LONG) dwVSN;
}
else
  result = -1;
return result;
}

// ShowDesktop is performed when Create posts a WM_SHOWDESKTOP
// message, so we see the correct value of fFolderOptions.
void CShellFolderView::ShowDesktop()
{
CTreeCtrl& tree = GetTreeCtrl();

PATHINFO PathInfo;
GetSpecialFolder(CSIDL_DESKTOP, &PathInfo);
//strDesktopPath = PathInfo.cPath;

// 创建桌面这个根结点
HTREEITEM hDesktop = CreateFolderNode(PathInfo.pidl, NULL, TRUE);
LPFOLDERNODE lpfn = (LPFOLDERNODE)tree.GetItemData(hDesktop);
FILEPATHLIST fpl;
GetLongFilePath(lpfn->pShellFolder, lpfn->pidl, &fpl);
tree.SetItemText(hDesktop, fpl.cNormal);
strcpy(lpfn->cPath , PathInfo.cPath);
lpfn->fType = ftDesktop;

// 展开桌面
AttachFolders(hDesktop);

tree.Expand(hDesktop, TVE_EXPAND);
}

// 展开指定的结点,如果需要的话,附加创建其下子结点
int CShellFolderView::Expand(HTREEITEM hNode, UINT nCode)
{
if(GetTreeCtrl().GetChildItem(hNode) == NULL)
{
AttachFolders(hNode);
}
return GetTreeCtrl().Expand(hNode, nCode);
}

// 将路径转化为PIDL,如果失败,返回NULL
LPITEMIDLIST PathToIDList(LPCTSTR lpszPath)
{
OLECHAR szOleStr[MAX_PATH];
IShellFolder* pDesktop = NULL;
LPITEMIDLIST lpidl = NULL;
// 使用桌面的IShellFolder来转换,这将生成一个绝对的PIDL
if(SHGetDesktopFolder(&pDesktop) != NOERROR)
return NULL;

// 将路径转换成宽字符格式
MultiByteToWideChar(CP_A

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