當您使用FILESYSTEMOBJECT物件來獲得某個目錄下的檔案清單的時候,您有沒有發現無法控制它們的排序方式,例如按照名字排序,按照副檔名排序,按照檔案大小排序等等,讓我們試著用陣列給它們排排序兒。
如果您想透過名字排序,那將是非常簡單的,但是假如你想透過檔案大小或檔案創立時間等等來排序的時候,那麼將有點麻煩。我們將透過二維數組做到這一點。
下面的程式碼示範如何透過選擇排序方式達到的我們目的,點選排序,點兩次就反著排了。
<HTML> <HEAD> <TITLE>文件排序示範</TITLE> </HEAD> <BODY> <% ' 設定一個演示目錄,:) CONST DIRECTORY = / ' 用常數定義排序方式 CONST FILE_NAME = 0 '依名字排序…依次類推 CONST FILE_EXT = 1 CONST FILE_TYPE = 2 CONST FILE_SIZE = 3 CONST FILE_CREATED = 4 CONST FILE_MODIFIED = 5 CONST FILE_ACCESSED = 6 '取得排序指令,預設為依照名字排序 req = Request(sortBy) If Len(req) < 1 Then sortBy = 0 Else sortBy = CInt(req) req = Request(priorSort) If Len(req) < 1 Then priorSort = -1 Else priorSort = CInt(req) '設定倒序 If sortBy = priorSort Then reverse = true priorSort = -1 Else reverse = false priorSort = sortBy End If ' 接下來開始我們真正的程式碼了。 。 。 path = Server.MapPath(DIRECTORY) Set fso = CreateObject(Scripting.FileSystemObject) Set theCurrentFolder = fso.GetFolder(path) Set curFiles = theCurrentFolder.Files ' 給這些文件做一個循環 Dim theFiles() ReDim theFiles(500) ' 我隨便定的一個大小 currentSlot = -1 ' start before first slot ' 我們將文件的所有相關資訊放到陣列裡面 For Each fileItem in curFiles fname = fileItem.Name fext = InStrRev(fname, .) If fext < 1 Then fext = Else fext = Mid(fname,fext+1) ftype = fileItem.Type fsize = fileItem.Size fcreate = fileItem.DateCreated fmod = fileItem.DateLastModified faccess = fileItem.DateLastAccessed currentSlot = currentSlot + 1 If currentSlot > UBound(theFiles) Then ReDim Preserve theFiles(currentSlot + 99) End If ' 放到數組裡 theFiles(currentSlot) = Array(fname,fext,ftype,fsize,fcreate,fmod,faccess) Next ' 現在都在陣列裡了,開始下一步 fileCount = currentSlot ' 檔案數 ReDim Preserve theFiles(currentSlot) ' 排序 ' (8 表示string) If VarType(theFiles(0)(sortBy)) = 8 Then If reverse Then kind = 1 Else kind = 2 ' 給予字元排序 Else If reverse Then kind = 3 Else kind = 4 '數字、時間。 。 。 End If For i = fileCount TO 0 Step -1 minmax = theFiles(0)(sortBy) minmaxSlot = 0 For j = 1 To i Select Case kind Case 1 mark = (strComp(theFiles(j)(sortBy), minmax, vbTextCompare) < 0) Case 2 mark = (strComp(theFiles(j)(sortBy), minmax, vbTextCompare) > 0) Case 3 mark = (theFiles(j)(sortBy) < minmax) Case 4 mark = (theFiles(j)(sortBy) > minmax) End Select If mark Then minmax = theFiles(j)(sortBy) minmaxSlot = j End If Next If minmaxSlot <> i Then temp = theFiles(minmaxSlot) theFiles(minmaxSlot) = theFiles(i) theFiles(i) = temp End If Next ' 結束 %> <FORM Name=doSort Method=Get> <INPUT Type=Hidden Name=priorSort Value=<% = priorSort %>> <INPUT Type=Hidden Name=sortBy Value=-1> </FORM> <SCRIPT Language=JavaScript> function reSort(which) { document.doSort.sortBy.value = which; document.doSort.submit(); } </SCRIPT> <CENTER> <FONT Size=+2> 顯示<% = (fileCount+1) %> 該目錄下的檔案<% = path %> </FONT> <P> 點選排序,再點一次反向排序 <P> <TABLE Border=1 CellPadding=3> <TR> <TH><A HREF=javascript:reSort(0);>檔名</A></TH> <TH><A HREF=javascript:reSort(1);>副檔名</A></TH> <TH><A HREF=javascript:reSort(2);>型別</A></TH> <TH><A HREF=javascript:reSort(3);>大小</A></TH> <TH><A HREF=javascript:reSort(4);>建立時間</A></TH> <TH><A HREF=javascript:reSort(5);>上次修改時間</A></TH> <TH><A HREF=javascript:reSort(6);>最後造訪時間</A></TH> </TR> <% For i = 0 To fileCount Response.Write <TR> & vbNewLine For j = 0 To UBound(theFiles(i)) Response.Write <TD> & theFiles(i)(j) & </TD> & vbNewLine Next Response.Write </TR> & vbNewLine Next %> </TABLE> </BODY> </HTML> |