DelphiBasics
FileExists
Function
Returns true if the given file exists SysUtils unit
 function FileExists ( const FileName : string ) : Boolean;
Description
The FileExists function returns True if the given FileName file exists.
 
The file is searched for in the current directory.
 
False may be returned if the user is not authorised to see the file.
Related commands
FileSearch Search for a file in one or more directories
FileSize Gives the size in records of an open file
FileGetAttr Gets the attributes of a file
FileSetAttr Sets the attributes of a file
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Example code : Check for a file before and after deleting it
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  SysUtils,   // Unit containing the FileExists command
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  fileName : string;
  myFile   : TextFile;
  data     : string;

begin
  // Try to open a text file for writing to
  fileName := 'Test.txt';
  AssignFile(myFile, fileName);
  ReWrite(myFile);

  // Write to the file
  Write(myFile, 'Hello World');

  // Close the file
  CloseFile(myFile);

  // Reopen the file in read mode
  Reset(myFile);

  // Display the file contents
  while not Eof(myFile) do
  begin
    ReadLn(myFile, data);
    ShowMessage(data);
  end;

  // Close the file for the last time
  CloseFile(myFile);

  // Now see if the file exists
  if FileExists(fileName)
  then ShowMessage(fileName+' exists OK')
  else ShowMessage(fileName+' does not exist');

  // Delete the file and look again
  DeleteFile(fileName);
  if FileExists(fileName)
  then ShowMessage(fileName+' still exists!')
  else ShowMessage(fileName+' no longer exists');
end;
 
end.
Hide full unit code
   Hello World
   Test.txt exists OK
   Test.txt no longer exists
 
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