Writing to and reading from a file using the C/AL code

Even though the XMLport takes care of the file integration requirements, sometimes we may want to perform this activity by using the C/AL code. This recipe will demonstrate how to read or write from a file using the C/AL code.

How to do it...

1. Let's start by creating a new codeunit from Object Designer.

2. Add the following global variables:

   Name	Type	Length
   StremOut	OutStrem
   FileOut	File
   StremIn	InStrem
   FileIn	File
   TextLine	Text	250

3. Add the following code in the OnRun trigger:

   IF NOT FileOut.CREATE('D:\NAVFile.txt') THEN
     IF NOT FileOut.OPEN('D:\NAVFile.txt') THEN
       ERROR('Unable to write to file!');
   FileOut.CREATEOUTSTREAM(StreamOut);
   StreamOut.WRITETEXT('Line 1');
   StreamOut.WRITETEXT();
   StreamOut.WRITETEXT('Line 2');
   StreamOut.WRITETEXT();
   FileOut.CLOSE;
   IF NOT FileIn.OPEN('D:\NAVFile.txt') THEN
     ERROR('Unable to read file!');
   FileIn.CREATEINSTREAM(StreamIn);
   WHILE NOT StreamIn.EOS DO BEGIN
     StreamIn.READTEXT(TextLine...