Create folder if it doesn't exist.

[Schaggo]

Hi,

I am trying to check if a folder exists and if not create it.
The folder structure is "/images/[imageset]/monochrome", "/images/[imageset]/color". As in /images/1/monochrome, /images/2/monochrome, ...

When uploading initially via

   String ftpprobestring = "/images/img" + String(counter) ;
   String ftpprobestring1 = ftpprobestring + "/col";
   String ftpprobestring2 = ftpprobestring + "/bw";
   ftp.OpenConnection();
   ftp.InitFile("TYPE A");
  
  ftp.MakeDir(ftpprobestring.c_str());
   ftp.MakeDir(ftpprobestring1.c_str());
   ftp.MakeDir(ftpprobestring2.c_str());
   ftp.CloseConnection();

every the program works like expected.
But if I want to create a folder that already exists I get a "550" for each attempt to create a folder - even if the following folders do not exist. For example the folder /1/ exists but the folders /monocrome/ and /color/ do not exist - I still get 3 answers "550".

I tried to create a list and check if one of the strings in said list contains the respective expressions - no success.

Is there a way to check if a folder exists and then create it?
Or use the server message like ftp.changeworkdir; if (server message == 550 ) makedir?

Cheers

[ldab]

I am trying to check if a folder exists and if not create it.

How?

But if I want to create a folder that already exists I get a "550" for each attempt to create a folder - even if the following folders do not exist. For example the folder /1/ exists but the folders /monocrome/ and /color/ do not exist - I still get 3 answers "550".

The highlighted was confusing, can you please elaborate?

Is there a way to check if a folder exists and then create it?

Not as a FTP commands: https://en.wikipedia.org/wiki/List_of_FTP_commands
You will need to do it manually, by checking if the folder exists. You can use ContentList(const char * dir, String * list) in order to check if the folder exists.

[Schaggo]

Hey thanks a lot for the response.
And also thanks A LOT for providing this library!

How?

I first tried with a string list via ContentList and a for loop to check if an entry contains the dynamic variable. I encountered a problem that the list got too big for the memory I have available.

But I found your answer to #11
This made me understand the Getftpanswer function.
So I added a an "Exists" function that is basically copy paste of ChangeWorkDir and a ExistStatus function that is a copy paste of GetftpAnswer, but sets an external flag "doesexist" instead of _isconnected.

I'm pretty sure there is a more elegant way, but this seems to work in the situations described above and doesn't use much memory.

Thanks again.

[ldab]

Sure that are better implementation, working with strings take a lot of memory, it would be better with char array, etc...

FTP by definition have some limitations :)