| Description |
The ReWrite procedure opens a file given by FileHandle for writing.
You must use AssignFile to assign a file to the FileHandle before using Reset.
If the file does not exist, it is created.
If the file already exists, the contents are lost, and new data is added to the start.
Use Write or WriteLn to write to the file after this ReWrite is executed.
Version 1
Is used for text files.
Version 2
Is for binary files. The optional RecordSize value is used to override the default 128 byte record size
for binary (untyped) files. For such files, only BlockRead and BlockWrite can be used.
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| Related commands |
| Append |
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Open a text file to allow appending of text to the end |
| AssignFile |
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Assigns a file handle to a binary or text file |
| CloseFile |
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Closes an open file |
| File |
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Defines a typed or untyped file |
| Reset |
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Open a text file for reading, or binary file for read/write |
| TextFile |
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Declares a file type for storing lines of text |
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| Example code : Writing and reading lines of text to/from a text 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 the file in read only mode
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
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