How to append to a file

Dynamics 365 Business Central/NAV Developers Forum
1

Hi all. I am trying to append to a file. I use f.SEEK(f.LEN) to move the pointer to the end of the file. When I try to write somthing in use of f.WRITE(somthing) after f.SEEK(f.LEN) I have a error message say ‘The operating system cannot gain access to the file.’. From the debugger I can see the file is opened and the length of file is found which is 1010 and the current position is 1010. How can I move the pointer to next position? I tried f.SEEK(f.LEN+1) and it didn’t work. Same error message popped up. Thanks

2

Hi April! Have you set File.WRITEMODE(TRUE) ? Also, File.TEXTMODE(TRUE) ? Regards, Jörg

3

Maybe file has read-only attribute [:D] -

4

Well, it looks like no one has idea how to do it?

5

For some reasons I can’t see the reply on my computer. Perhaps I deleted all cookies from my Internet Explorer. Now I am using my workmate’s computer before I fix the settings of mine. Joerg, I did set writemode and textmode to true. Still doesn’t work. Arthur, the file is not read-only. I designed a text file will be generated by running a report at first time. When the user run it again, the new data populated will append to the file. There is no file property setup in this case. Thanks anyway.

6

Thanks, guys. It is working now.

7

Hi April, Could you please share with us what the solution was? You mentioned that it was not due to writemode/textmode or the file property. So what was it? :wink:

8

As i too hate thread without solutions … here my assumption: You receive this error if you make WRITEMODE(TRUE) after opening/creating of file!