| Description |
The Append procedure opens a file given by FileHandle to allow subsequent writes to append to the end of the file.
You must use AssignFile to assign a file to the FileHandle before using Append.
This is often used when logging information - existing log data must be preserved, with the new log information appended to the end.
Use Write or WriteLn to write to the file after this Append is executed.
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| Related commands |
| AssignFile |
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Assigns a file handle to a binary or text file |
| TextFile |
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Declares a file type for storing lines of text |
| Write |
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Write data to a binary or text file |
| WriteLn |
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Write a complete line of data to a text file |
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| Example code : Appending a line of text to an existing file |
// 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
// The System unit does not need to be defined
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
myFile : TextFile;
text : string;
begin
// Try to open the Test.txt file for writing to
AssignFile(myFile, 'Test.txt');
ReWrite(myFile);
// Write a couple of well known words to this file
WriteLn(myFile, 'Hello');
WriteLn(myFile, 'World');
// Close the file
CloseFile(myFile);
// Reopen to append a final line to the file
Append(myFile);
// Write this final line
WriteLn(myFile, 'Final line added');
// Close the file
CloseFile(myFile);
// Reopen the file for reading
Reset(myFile);
// Display the file contents
while not Eof(myFile) do
begin
ReadLn(myFile, text);
ShowMessage(text);
end;
// Close the file for the last time
CloseFile(myFile);
end;
end.
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| Hide full unit code |
Hello
World
Final line added
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