Re: IFS I-O Problems -- RPG400-L

I am using the IFS IO API's and am having a problem creating a file inan RPG IV program. I am getting back a -1 in the File Descriptor whenusing the OPEN.

The system will set errno to tell you what failed. More info aboutchecking errno can be found at the following link:

http://www.scottklement.com/rpg/ifs_ebook/errors.html

My file name is \root\ifsreports\JEFF\corbtch.xls,


problems:

a) The root of the IFS is simply "/" you do not need/want to specify theword "root".

b) You have the slashes backward. You've mistakenly used the Windows-stylebackslashes (that look like this "\") instead of the Unix-style forwardslashes ("/")


Therefore, I think your path should probably look like this:

     /ifsreports/JEFF/corbtch.xls

Also, please make sure that you trim any trailing blanks from the filenamebefore passing it to open(). (That seems to be a common gotcha for peoplewho are new to the IFS... they leave the blanks in and think that theywon't matter -- they do, and the file that it creates WILL have the blanksat the end, which makes it very difficult to work with!)

Open_Flag is O_CREAT + O_WRONLY + O_CODEPAGE, Mode_Flag is S_IWUSR +S_IRUSR + S_IRGRP + S_IROTH. Is there any way to determine what it doesnot like?

That's what errno is for. Though, I'm pretty sure it's the pathname --but you should NEVER write a program that doesn't give a meaningful errormessage when something fails. ALWAYS have code that checks errno if open()fails, and tells the user what went wrong.


        fd = open('/blah/blah': O_CREAT+O_WRONLY+O_CODEPAGE
                              : S_IWUSR + S_IRGRP + S_IROTH
                              : 1252 );
        if ( fd = -1 );
           ptrToErrno = syserrno();
           msg = %str(strerror(errno));
           // SHOW MESSAGE TO USER!
        endif;

Seriously, you'll have a lot of headaches down the road if you don't giveyour users helpful information about the reasons why the APIs fail.