mainunit.pas

《Delphi7经典问题解析》源代码

unit mainunit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons,FileCtrl;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Label1: TLabel;
    Label2: TLabel;
    ComboBox1: TComboBox;
    Edit1: TEdit;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    BitBtn3: TBitBtn;
    Label3: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
    procedure Edit1Change(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
    procedure BitBtn3Click(Sender: TObject);
  private
    { Private declarations }
  public
    function CurrentIsValidDir(SearchRec:TSearchRec):integer;
    procedure RecurSearchFile(CurrentDir:string;SearchFileType:string;SearchResult:TStrings;var Number:integer);
    { Public declarations }
  end;

var
  Form1: TForm1;
  TotalFileNumbers:Integer;
  SearchFileType:String;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
 TotalFileNumbers:=0;
 SearchFileType:='*.txt';
end;

function TForm1.CurrentIsValidDir(SearchRec:TSearchRec):integer;
begin
if ((SearchRec.Attr <> 16) and
    (SearchRec.Name<>'.')  and
    (SearchRec.Name<>'..')) then
  Result:=0
  else if ((SearchRec.Attr = 16) and
           (SearchRec.Name<>'.') and
           (SearchRec.Name<>'..')) then
  Result:=1
  else
  Result:=2;
end;

Procedure TForm1.RecurSearchFile(CurrentDir:string;SearchFileType:string;SearchResult:TStrings;var Number:integer);
var
 i:integer;
 Subdir:TStringList;
 SearchRec:TsearchRec;
begin
//第一次调用FindFirst和FindNext查找符合要求的文件
 if (FindFirst(CurrentDir+SearchFileType, faAnyFile, SearchRec)=0) then
  begin
   repeat
    if CurrentIsValidDir(SearchRec)=0 then
      begin
       Inc(Number);
       Searchresult.Add(CurrentDir+SearchRec.Name);
      end;
    application.ProcessMessages ;
   until (FindNext(SearchRec) <> 0);
  end;
 FindClose(SearchRec);

//以下是递归部分，查找各子目录。
 Subdir:=TStringList.Create;
 if (FindFirst(CurrentDir+'*.*', faDirectory, SearchRec)=0) then
  begin
   repeat
    if CurrentIsValidDir(SearchRec)=1 then
     begin
      Subdir.Add(SearchRec.Name);
     end;
    application.ProcessMessages ;
   until (FindNext(SearchRec) <> 0);
  end;
 FindClose(SearchRec);
 for i:=0 to Subdir.Count-1 do
  begin
   RecurSearchfile(CurrentDir+Subdir.Strings[i]+'\',SearchFileType,Searchresult,Number);
  end;

//资源释放并返回结果。
 Subdir.Free;
end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
 Case ComboBox1.ItemIndex of
  0:SearchFileType:='*.txt';
  1:SearchFileType:='*.bmp';
  2:SearchFileType:='*.mp3';
  3:SearchFileType:='*.*';
 end;
end;

procedure TForm1.Edit1Change(Sender: TObject);
begin
 if Edit1.Text='' then
  BitBtn2.Enabled:=False
 else
  BitBtn2.Enabled:=True; 
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
var
 SelectDir:string;
begin
 if SelectDirectory(SelectDir, [sdAllowCreate, sdPerformCreate, sdPrompt],0) then
  begin
   if length(SelectDir) > 3 then
    SelectDir:=SelectDir+'\';
   Edit1.Text:=SelectDir;
  end;
end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
 memo1.lines.Clear ;
 TotalFileNumbers:=0;
 RecurSearchFile(Edit1.Text,SearchFileType,memo1.lines, TotalFileNumbers);
 Label3.Caption:='查找结果显示:'+'一共在当前目录下找到'+IntToStr(TotalFileNumbers)+'个'+SearchFileType+'类型的文件';
end;

procedure TForm1.BitBtn3Click(Sender: TObject);
begin
 Close;
end;

end.