Source Code



Check two files are equal

  • anonymous
  • Feb 22' 14
  • Delphi
  • 277
  • 90
  • United States

Source one

 


function Are2FilesEqual(const File1, File2: TFileName): Boolean;
var
  ms1, ms2: TMemoryStream;
begin
  Result := False;
  ms1 := TMemoryStream.Create;
  try
    ms1.LoadFromFile(File1);
    ms2 := TMemoryStream.Create;
    try
      ms2.LoadFromFile(File2);
      if ms1.Size = ms2.Size then
        Result := CompareMem(ms1.Memory, ms2.memory, ms1.Size);
    finally
      ms2.Free;
    end;
  finally
    ms1.Free;
  end
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if Opendialog1.Execute then
    if Opendialog2.Execute then
      if Are2FilesEqual(Opendialog1.FileName, Opendialog2.FileName) then
        ShowMessage('Files are equal.');
end;

 

Source Two


function FilesAreEqual(const File1, File2: TFileName): Boolean;
const  
  BlockSize = 65536;
var  
  fs1, fs2: TFileStream;  
  L1, L2: Integer;  
  B1, B2: array[1..BlockSize] of Byte;
begin  
  Result := False;  
  fs1 := TFileStream.Create(File1, fmOpenRead or fmShareDenyWrite);
  try    
    fs2 := TFileStream.Create(File2, fmOpenRead or fmShareDenyWrite);
    try      
      if fs1.Size = fs2.Size then 
      begin        
        while fs1.Position .Size do 
        begin          
          L1 := fs1.Read(B1[1], BlockSize);
          L2 := fs2.Read(B2[1], BlockSize);
          if L1  L2 then 
          begin            
            Exit;
          end;          
          if not CompareMem(@B1[1], @B2[1], L1) then Exit;        
        end;        
        Result := True;      
      end;    
    finally      
      fs2.Free;    
    end;  
  finally    
    fs1.Free;  
  end;
end;

 

  • Tags : check, equal, files
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