创建文件夹浏览器

Posted 2021-05-17 skdev

 

一 实例

 

二 思路

1 GetLocalDeviceString 可获得当前电脑的盘符，即c:d:e:，盘符之间以’/0’相隔。

2 GetFileAttributes 用来判断是否文件夹。

dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY&&strcmp(cFileName,".")!=0&&strcmp(cFileName,"..")!=0 即表示该文件为文件夹。

3 FindFirstFile 查找指定路径的第一个文件。

4 FindNextFile 查找下一个文件。

5 hTreeItem=(HTREEITEM)SendMessage(hTree,TVM_GETNEXTITEM,TVGN_PARENT , (LPARAM)tvi.hItem); 获取当前结点的父结点，用以获得所选择结点的路径。

6 hTreeItem=(HTREEITEM)SendMessage(hwTree,TVM_GETNEXTITEM,TVGN_CHILD , (LPARAM)hTItem); 获取当前结点目录的子文件，用以获取第一个子目录。

7 hTreeItem=(HTREEITEM)SendMessage(hwTree,TVM_GETNEXTITEM,TVGN_NEXT , (LPARAM)hTItem); 获取当前结点的下一个结点，用以列出子目录。

8 思路描述

由于遍历电脑的所有文件夹既浪费时间，影响性能，也没必要。我们只需展示当前目录的所有子目录，而子目录只需用+来表示是否包有子目录，而+只要检测到该目录包有一个子目录即可。所以只需搜索当前层和下一层的第一个文件夹即可。每次展开一个文件夹之后，下次就不需再检测了，因而性能相对来说好多了。

第一次显示，只搜索第一个文件夹，使其有+或-；当点击该目录时，搜索当前目录的子目录，若搜索到第一个子目录，则用+表示。

如何对所选择文件夹进行展开？① 选取当前目录；② 对该目录按上面规则展开。

展开全部和展开局部：展开全部指展开当前目录的所有子目录；展开局部指展开当前目录的一两个子目录。当点击某个目录时，然后展开当前目录的全部和展开所有子目录的局部。

如何对已存在的目录不再展开？如果已存在的项<=2，则删除已打开，再展开全部；否则不处理。

三 代码

folder.h///

#include <windows.h>

#include <commctrl.h>

#include <stdio.h>

#include "resource.h"

 

#pragma comment(lib,"comctl32.lib")

 

int                   InitTreeView(HWND hwndTree,HINSTANCE hInstance);

int                   FindDir(HTREEITEM hTItem,char dir[]);

int                   ExpandAll(HTREEITEM hTItem,char dir[]);

int                   IsItemExist(HTREEITEM hTItem,char dir[]);

 

/folder.cpp/

#include "folder.h"

 

HWND            hwTree;

HTREEITEM hTreeItem[10];

 

/*树形列表

名称：InitTreeView

功能：初始化树形控件

参数：hwndTree 为树形列表控件句柄，hInstance为程序句柄

*/

int InitTreeView(HWND hwndTree,HINSTANCE hInstance)

{

       int                         tx=0,i,len;

       char               Driver[50],p[20],dir[200];

       TV_INSERTSTRUCT tvs;

       TV_ITEM                    tvi;

 

       hwTree=hwndTree;

       HIMAGELIST himgl;

       himgl=ImageList_Create(16,16,ILC_COLOR16,1,10);

       i=ImageList_AddIcon(himgl,LoadIcon(hInstance,(LPCTSTR)IDI_FCLOSE));

       i=ImageList_AddIcon(himgl,LoadIcon(hInstance,(LPCTSTR)IDI_FIXED));

       i=ImageList_AddIcon(himgl,LoadIcon(hInstance,(LPCTSTR)IDI_COMPUTER));

       i=ImageList_AddIcon(himgl,LoadIcon(hInstance,(LPCTSTR)IDI_FOPEN));

       himgl=TreeView_SetImageList(hwndTree,himgl,TVSIL_NORMAL);

 

       tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

       tvi.pszText ="我的电脑";

       tvi.iImage=2;

       tvi.iSelectedImage=2;

       tvs.hInsertAfter=TVI_LAST;

       tvs.hParent=TVI_ROOT;

       tvs.item =tvi;

       hTreeItem[0]=TreeView_InsertItem(hwndTree,&tvs);      

   ///以下为分为盘符C：D：等的功能

       GetLogicalDriveStrings(50,Driver);

       i=0;

       while(1)

       {

              len=strlen(&Driver[i]);

              if(len==0)

                     break;           

              sprintf(dir,"%s*",&Driver[i]);

              Driver[i+len-1]='/0';

              sprintf(p,"%s",&Driver[i]);

              tx=0;

              tvs.hParent=hTreeItem[tx];

              tvi.pszText=p;

              tvi.cchTextMax=strlen(tvi.pszText);

              tvi.iImage=1;

              tvi.iSelectedImage=1;

              tvs.item=tvi;

              tx++;

              hTreeItem[tx]=TreeView_InsertItem(hwndTree,&tvs);                   

              FindDir(hTreeItem[tx],dir);

              i+=len+1;

       }    

       SendMessage(hwndTree,TVM_EXPAND,TVE_EXPAND|TVE_EXPANDPARTIAL,(LPARAM)hTreeItem[0]);

       return 1;

}

/*名称：FinDir

 功能：展开局部，即展为子目录的第一个或第二个目录

 参数：hTItem当前目录的句柄，dir 当前目录的路径

*/

int FindDir(HTREEITEM hTItem,char dir[])

{

       TV_INSERTSTRUCT tvs;

       TV_ITEM       tvi;     

       WIN32_FIND_DATA fdata;

       HANDLE               hF=NULL;

 

       tvs.hParent=hTItem;

       hF=FindFirstFile (dir,&fdata);

       if (hF == INVALID_HANDLE_VALUE)

       {

        FindClose(hF);

        return 0;

       }

       else if(fdata.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY&&strcmp(fdata.cFileName,".")!=0&&strcmp(fdata.cFileName,"..")!=0)

       {           

              tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

              tvs.hInsertAfter=TVI_LAST;    

              tvi.pszText=fdata.cFileName;

              tvi.cchTextMax=strlen(tvi.pszText);

              tvi.iImage=0;

              tvi.iSelectedImage=3;

              tvs.item=tvi;

              TreeView_InsertItem(hwTree,&tvs);

        }

       while(FindNextFile(hF,&fdata)!=0)

       {

              if(fdata.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY&&strcmp(fdata.cFileName,".")!=0&&strcmp(fdata.cFileName,"..")!=0)

              {

              tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

              tvs.hInsertAfter=TVI_LAST;    

              tvi.pszText=fdata.cFileName;

              tvi.cchTextMax=strlen(tvi.pszText);

              tvi.iImage=0;

              tvi.iSelectedImage=3;

              tvs.item=tvi;

              TreeView_InsertItem(hwTree,&tvs);

              break;

              }

       }

       FindClose(hF);

       return 1;

}

/*名称：ExpandAll

 功能：展开全部，展开当前的所有子目录

 参数：hTItem当前目录句柄，dir为当前目录的路径

*/

int ExpandAll(HTREEITEM hTItem,char dir[])

{

       char                      path[200];

       TV_INSERTSTRUCT           tvs;

       TV_ITEM                           tvi;  

       WIN32_FIND_DATA           fdata;

       HANDLE                      hF=NULL;

       HTREEITEM                hexpanitem;

 

       tvs.hParent=hTItem;

       sprintf(path,"%s//*",dir);

       hF=FindFirstFile (path,&fdata);

       if (hF == INVALID_HANDLE_VALUE)

       {

        FindClose(hF);

        return 0;

       }

       else if(fdata.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY&&strcmp(fdata.cFileName,".")!=0&&strcmp(fdata.cFileName,"..")!=0)

       {           

              tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

              tvs.hInsertAfter=TVI_LAST;    

              tvi.pszText=fdata.cFileName;

              tvi.cchTextMax=strlen(tvi.pszText);

              tvi.iImage=0;

              tvi.iSelectedImage=3;

              tvs.item=tvi;

              hexpanitem=TreeView_InsertItem(hwTree,&tvs);

              sprintf(path,"%s//%s//*",dir,fdata.cFileName);

              FindDir(hexpanitem,path);

        }

       while(FindNextFile(hF,&fdata)!=0)

       {

              if(fdata.dwFileAttributes==FILE_ATTRIBUTE_DIRECTORY&&strcmp(fdata.cFileName,".")!=0&&strcmp(fdata.cFileName,"..")!=0)

              {

              tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

              tvs.hInsertAfter=TVI_LAST;    

              tvi.pszText=fdata.cFileName;

              tvi.cchTextMax=strlen(tvi.pszText);

              tvi.iImage=0;

              tvi.iSelectedImage=3;

              tvs.item=tvi;

              hexpanitem=TreeView_InsertItem(hwTree,&tvs);

              sprintf(path,"%s//%s//*",dir,fdata.cFileName);

              FindDir(hexpanitem,path);

              }

       }

       FindClose(hF);

       return 1;

}

/*名称：IsItemExist

 功能：判断当前目录是否已全部展开，用以判断若是展开则不必再展开全部

 参数：hTItem为当前目录句柄，dir为当前目录的路径

*/

int IsItemExist(HTREEITEM hTItem,char dir[])

{

       HTREEITEM         hTreeItemtemp;

       int                         count;

 

       hTreeItemtemp=(HTREEITEM)SendMessage(hwTree,TVM_GETNEXTITEM,TVGN_CHILD,(LPARAM)hTItem);   

       if(hTreeItemtemp==NULL)

                     return 0;

       hTItem=hTreeItemtemp;

       count=1;

       while(1)

       {

              hTreeItemtemp=(HTREEITEM)SendMessage(hwTree,TVM_GETNEXTITEM,TVGN_NEXT,(LPARAM)hTItem);

              if(hTreeItemtemp==NULL)

                     break;

              hTItem=hTreeItemtemp;

              count++;

              if(count>=3)

                     return 1;

       }

       while(1)

       {

              hTreeItemtemp=(HTREEITEM)SendMessage(hwTree,TVM_GETNEXTITEM,TVGN_PREVIOUS,(LPARAM)hTItem);

              SendMessage(hwTree,TVM_DELETEITEM,0,(LPARAM)hTItem);

              if(hTreeItemtemp==NULL)

                     return 0;

              hTItem=hTreeItemtemp;

       }

       return 1;

}

 

/main.cpp///

HWND            hTree;

LPNM_TREEVIEW        pnmtv; 

char                buff[50];

char                buffPath[MAX_PATH],tempPath[MAX_PATH];

TV_ITEM                     tvi;

HTREEITEM          hTreeItemtemp;

case WM_NOTIFY:       

              pnmtv=(NM_TREEVIEW FAR *)lParam;

              if(pnmtv->hdr.code==TVN_SELCHANGED||pnmtv->hdr.code==TVN_ITEMEXPANDING)

              {                                

                     tvi.mask=TVIF_IMAGE|TVIF_SELECTEDIMAGE|TVIF_TEXT;

                     tvi.hItem=pnmtv->itemNew.hItem;

                     tvi.pszText=buff;

                  tvi.cchTextMax=50;     

                     hTree=GetDlgItem(hDlg,ID_TREE_FOLDER);

                     SendMessage(hTree,TVM_GETITEM,0,(LPARAM)(TV_ITEM FAR*)&tvi);

                     if(strcmp(buff,"我的电脑")==0)

                            return 0;

                     sprintf(buffPath,"%s",buff);

                     strcpy(tempPath,buffPath);                

                     while(1)

                     {

                            hTreeItemtemp=(HTREEITEM)SendMessage(hTree,TVM_GETNEXTITEM,TVGN_PARENT,(LPARAM)tvi.hItem);

                            tvi.mask=TVIF_TEXT;

                            tvi.hItem=hTreeItemtemp;

                            tvi.pszText=buff;

                            tvi.cchTextMax=50;     

                            SendMessage(hTree,TVM_GETITEM,0,(LPARAM)(TV_ITEM FAR*)&tvi);                

                            if(strcmp(buff,"我的电脑")==0)

                                   break;

                            sprintf(buffPath,"%s//%s",buff,tempPath);

                            strcpy(tempPath,buffPath);

                     }

                     SetDlgItemText(hDlg,ID_SRCPATH,buffPath);

                     if(!IsItemExist(pnmtv->itemNew.hItem,buffPath))

                            ExpandAll(pnmtv->itemNew.hItem,buffPath);

              }    

              break;