procedure AssignPrn ( var FileHandle : TextFile ) ;
Description
The AssignPrn procedure assigns the printer to a FileHandle. This means that subsequent text writing to this file gets rerouted to the printer. This provides a simpl and easy way of dumping out text to a printer.
Notes
Warning : The AssignPrn mechanism is useful for simple programs, but lacks any control over printing for a real application.
Related commands
AssignFile Assigns a file handle to a binary or text file
CloseFile Closes an open file
ReWrite Open a text or binary file for write access
Write Write data to a binary or text file
WriteLn Write a complete line of data to a text file
Example code : Print a few words to the printer
var
myFile : TextFile;
printDialog : TPrintDialog;
begin
// Create a printer selection dialog
printDialog := TPrintDialog.Create(Form1);
// If the user has selected a printer (or default), then print!
if printDialog.Execute then
begin
// Try to open a printer file
AssignPrn(myFile);
// Now prepare to write to the printer
ReWrite(myFile);
// Write a couple of well known words to this file -
// they will be printed instead
WriteLn(myFile, 'Hello');
WriteLn(myFile, 'World');
// Close the file
CloseFile(myFile);
end;
end;
Show full unit code
After the user selects a printer, the following text is printed in a small font at the top left of the page:
Hello
World