What is the difference between the CommaIO and Comma7IO classes?

Question

There is no documentation in the help file as to the purpose of the Comma7IO class, just that it extends the CommaIO class.

What is the difference?

Answer 1

To support read and write of different formats of external files, MorphX features a range of different Io classes; CommaIo for comma separated files, Comma7Io for comma separated 7 bit files, BinaryIo for binary files and AsciiIo for plain text files.

From this link: RE: [Axapta-Knowledge-Village] Somthing cool - IO

Answer 2

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static void TestComma7Io(Args _args)
{
    str                 testString  = 'ABCDEFG~ÀÁÂÃÄÅÆÇÈÉÊË~HIJKLMNOP';
    str                 filename    = @"C:\TMP\test1.txt";
    str                 mode        = 'W';
    Io                  io;
    container           con;
    FileIoPermission    perm;
    ;

    perm = new FileIoPermission(filename, mode);

    if (!perm)
        return;

    perm.assert();

    // BP deviation documented.
    io = new Comma7Io(filename, mode);

    if (io)
        io.write(testString);

    CodeAccessPermission::revertAssert();
}

and check the content of the file: "ABCDEFG~\300\301\302\303\304\305\306\307\310\311\312\313~HIJKLMNOP". As you see, 8-bit characters have been replaced with their octal codes.

If you replace io = new Comma7Io(filename, mode); with io = new CommaIo(filename, mode); the original string will be written to the file: "ABCDEFG~ÀÁÂÃÄÅÆÇÈÉÊË~HIJKLMNOP".