Question

如果我执行它，我的应用程序将不会响应，直到找到所有文件和它们到列表框我的问题是如何使这个功能多线程，以避免不相应的情况！我仍然是Delphi novoice

procedure TfrMain.FileSearch(const PathName, FileName : string; txtToSearch : string; const InDir : boolean);
var Rec  : TSearchRec;
    Path : string;
    txt  : string;
    fh   : TextFile;
    i    : integer;
begin


Path := IncludeTrailingBackslash(PathName);
if FindFirst(Path + FileName, faAnyFile - faDirectory, Rec) = 0 then
 try
   repeat

     AssignFile(fh, Path + Rec.Name);
     Reset(fh);
     Readln(fh,txt);

     if ContainsStr(txt, txtToSearch) then
        ListBox1.Items.Add(Path + Rec.Name);

   until FindNext(Rec) <> 0;
 finally
   FindClose(Rec);

 end;

If not InDir then Exit;

if FindFirst(Path + '*.*', faDirectory, Rec) = 0 then
 try
   repeat
    if ((Rec.Attr and faDirectory) <> 0)  and (Rec.Name<>'.') and (Rec.Name<>'..') then
     FileSearch(Path + Rec.Name, FileName, txtToSearch, True);
   until FindNext(Rec) <> 0;
 finally
   FindClose(Rec);
 end;
end;

Answer 1

Here您可以找到有关使用OmniThreadLibrary实施的后台文件扫描程序的文章。

Answer 2

您可以将文件扫描内容放入线程中，当工作完成后，向主窗体发送一条Windows消息，然后更新列表框（未测试的代码，将其作为伪代码）：

const 
  WM_FILESEARCH_FINISHED = WM_USER + 1;

TFileSearchThread = class (TThread)
private
  FPath       : String;
  FFileNames  : TStringList;
protected
  procedure Execute; override;
public
  constructor Create (const Path : String);
  destructor Destroy; override;
  property FileNames : TStrings read FFileNames;
end;

constructor TFileSearchThread.Create (const Path : String);
begin
  inherited Create (True);
  FPath := Path;
  FFileNames := TStringList.Create;
end;

destructor TFileSearchThread.Destroy;
begin
  FreeAndNil (FFileNames);
  inherited;
end;

procedure TFileSearchThread.Execute;  
begin
  // do your file search here, adding each file to FFileNames
  PostMessage (MainForm.Handle, WM_FILESEARCH_FINISHED, 0, 0);
end;

您可以像这样使用它：

Thead := TFileSearchThread.Create (Path);
Thread.Start;

并且主窗体将有一个这样的消息处理程序：

type
  TMainForm = class(TForm)
    ListBox1: TListBox;
  private
    procedure WMFileSearchFinished (var Msg : TMessage); message WM_FILESEARCH_FINISHED;
  public
    { Public declarations }
  end;

implementation

procedure TMainForm.WMFileSearchFinished (var Msg : TMessage);
begin
  ListBox1.Items.AddStrings (Thread.FileNames);
end;

delphi文件搜索多线程

2 个答案: