mathes
asked on
I/O error 104 when printing a file
Hi experts,
with the following source code, I try to print an ASCII text file on my printer:
procedure TfrmPrintFile.Button3Click
var filename: string;
printer:textfile;
begin
if opendialog1.execute then
filename:=opendialog1.file
assignPrn (printer);
{$I-} rewrite (printer); {$I+}
if ioresult<>0 then halt;
while not eof (printer)
do writeln (printer,filename);
closefile(printer);
end;
Unfortunately Delphi complains about an I/O error Nr. 104
in the line:
while not eof (printer)
What am I doing wrong here?
With kind regards
Christian
with the following source code, I try to print an ASCII text file on my printer:
procedure TfrmPrintFile.Button3Click
var filename: string;
printer:textfile;
begin
if opendialog1.execute then
filename:=opendialog1.file
assignPrn (printer);
{$I-} rewrite (printer); {$I+}
if ioresult<>0 then halt;
while not eof (printer)
do writeln (printer,filename);
closefile(printer);
end;
Unfortunately Delphi complains about an I/O error Nr. 104
in the line:
while not eof (printer)
What am I doing wrong here?
With kind regards
Christian
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Hi. Your code produces the error on the "EOF(printer)" statement. It happends because the printer isn't concidered a readable device, so you can read it to find it's end. Therefore you have to avoid this statement.
To print your file you write something like this:
var filename, s: string;
printer, t: textfile;
begin
if opendialog1.execute then
filename:=opendialog1.file
try
assignPrn(printer);
rewrite(printer);
reset(t, FileName);
while not eof(t) do begin
readln(t, s);
writeln(printer, s);
end;
finally
closefile(t);
closefile(printer);
end;
end;
-Sorry I was unclear and not specific.
All the best,
--Matvey
To print your file you write something like this:
var filename, s: string;
printer, t: textfile;
begin
if opendialog1.execute then
filename:=opendialog1.file
try
assignPrn(printer);
rewrite(printer);
reset(t, FileName);
while not eof(t) do begin
readln(t, s);
writeln(printer, s);
end;
finally
closefile(t);
closefile(printer);
end;
end;
-Sorry I was unclear and not specific.
All the best,
--Matvey
ASKER
Dear Matvey,
thank you for reviewing my code concerning file printing. Now all works perfectly
as I like it.
Please excuse my unclear question. Of course it was well intended from
you when you provided me with details about font settings. I did not tell
you that I prefer a spartanic printout in this specific case.
With kind regards.
Christian
thank you for reviewing my code concerning file printing. Now all works perfectly
as I like it.
Please excuse my unclear question. Of course it was well intended from
you when you provided me with details about font settings. I did not tell
you that I prefer a spartanic printout in this specific case.
With kind regards.
Christian
ASKER
I basically know how one can print a file. But I don't know my error in the posted source. So can you please review my code and stick please a little bit closer at it with your reply? (You did not explain to me the error 104). In this situation I don't need to set a specific font. A simple printout will perfectly meet my expectations. Moreover I don't know at program start what I want to print. This decision is made by the user during run time of the program. This is the reason why I have to open a file and send its content to the printer. In my specific situation I can't send a certain string to the printer- as you do it in your sample code- because the concrete content of the strings are not known at program start.
So please, try it again.
With kind regards
Christian