Question on importing text from files

Hi I've been working on how to make my program manage to input 32 8-bit vectors in from one file (infile.txt) and write changed values into another file (outfile.txt). Here is the code that is relevant to file reading/writing:

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
library STD;
use ieee.std_logic_textio.all;
use std.textio.all;

entity quickSorter is
generic (infile : string := "infile.txt";
outfile : string := "outfile.txt");
end quickSorter;

architecture Behavioral of quickSorter is
begin
controller : process
variable tempData : std_logic_vector(7 downto 0);
variable tempString : bit_vector(7 downto 0);
variable sortArray : dataArray;
variable fresult : file_open_status := status_error;
variable tempLine : line;
file in_fd : text open read_mode is infile;
file out_fd : text open write_mode is outfile;
begin

--debug file processes
file_open (fresult, in_fd, infile, read_mode);
if (fresult /= OPEN_OK) then
assert false
report "usage: quickSort"
severity failure;
end if;
file_open (fresult, out_fd, outfile, write_mode);
if (fresult /= open_ok) then
assert false
report "usage: quickSort"
severity failure;
end if;

--read file
while (not endfile(in_fd)) loop
readline (in_fd, tempLine);
read (tempLine, tempString);
end loop;

--misc code
--code which generates conditions for
--the for loop underneath

--write file
for loop
write (tempLine, tempString);
writeLine (out_fd, tempLine);
end loop;

wait;
end process;
end Behavioral;

The entire program compiles correctly, syntax-wise.
However, the simulation always ends on the line after
file_open (fresult, in_fd, infile, read_mode);
which unfortunately means the file is incapable of being opened.
I have added two user document source files to the project (infile.txt and outfile.txt).
I have removed all code besides the relevant infile/outfile coding.
Could someone please help me fix the error?
Thanks for the assistance in advance.
In case of reference, this is run with Xilinx software in vhdl code.

boingboing

[scottcarl]

The file_open command is not needed. Check out the subtle changes I made to your code to see how this works now. You have to place all the incoming data into an array (sortArray) and then write it back out. Generate a counter (v_count) that will tell you how many you read in and how many are needed to write out.

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
library STD;
use ieee.std_logic_textio.all;
use std.textio.all;

entity quickSorter is
generic (infile : string := "infile.txt";
outfile : string := "outfile.txt");
end quickSorter;

architecture Behavioral of quickSorter is
begin
controller : process
variable tempData : std_logic_vector(7 downto 0);
variable tempString : std_logic_vector(7 downto 0);
type dataArray is array(1 to 8) of std_logic_vector(7 downto 0);
variable sortArray : dataArray;
variable fresult : file_open_status := status_error;
variable tempLine : line;
variable v_count : integer := 0;
file in_fd : text open read_mode is infile;
file out_fd : text open write_mode is outfile;
begin


--read file
while (not endfile(in_fd)) loop
	v_count := v_count + 1;
readline (in_fd, tempLine);
read (tempLine, tempString);
  sortArray(v_count) := tempString; 
end loop;

--misc code
--code which generates conditions for 
--the for loop underneath

--write file
for i in 1 to v_count loop
  write (tempLine, sortArray(i));
  writeLine (out_fd, tempLine);
end loop;

wait; 
end process;
end Behavioral;

scottcarl