How to enforce JMP to open a file in read only mode?

Georg

Dear all,

I use a method to update Addins like described in https://community.jmp.com/t5/JMP-Scripts/How-to-write-self-updating-JMP-add-ins/ta-p/21932/jump-to/first-unread-message  by @Jeff_Perkinson . There a file "metadata.jmp" Needs to be opened when JMP starts. I experienced some Problems with Opening this file automatically by many users, because under some circumstances a user might Keep that file opened for a Long time (without knowing this), and then I'm not able to update this files.

 

Also in other cases (large datatables shared by many users) it May be good to open files in Read only mode.

 

Is there a possibility to enforce JMP to open a data table etc. in Read only mode?

ih

I'm not sure how to open a file as read only (if anyone knows please chime in), but here are some ideas that might help you alleviate your issue:

• Change file permissions so most users have read-only access to that file.
• Make the section of code that needs the file open short and simple, and wrap it in a try block.  After the try block that handle the file operations, or in the catchExpr section, include code to close the file.  For example:

  try(
  	//Work with the file here
  	dt = Open("a file");
  	values = dt:Column << get values;
  	dt << Close;
  	
  ,	//This is the catchExpr, it is executed on an error.
  	
  	//Make sure the file is closed, but don't throw another if it wasn't open.
  	try( dt << Close ); 
  	
  	//Now raise an error.
  	throw( "Error working with metadata file: " || char( Exception_msg ) );
  );
  
  
  //Or you could close the file in a subsequent try function
  try(
  	//Work with the file here
  	dt = Open("a file");
  	values = dt:Column << get values;
  );
  try( dt << Close ); 
  
  
  //Now do any time consuming functions on the data extracted from that file
  //show(values);