This tip was originally published in the Developer's Club on the Uniface web site by Leo van den Berge, but it is so useful I just have to repeat it here.
File name entry and ASN file redirections
When a function within IDF requires the name of a file it allows the user to either enter a name manually, or displays a standard filebox which allows the user to browse through the directory structure. However, a filename which is chosen via a filebox is always returned fully qualified (eg:
C:\projects\data\fname.txt) whereas a name entered manually may not be. If the ASN file contains an entry that matches that filename (eg:
*.TXT = TEXT/*.TXT) then this redirection is applied to the fully qualified filename, turning it from a valid name into an invalid one. This can cause hours of confusion as the function within IDF is given a perfectly valid file name, but it refuses to work because it is being redirected to a non-existent folder.
To avoid this confusion any redirection specified in the ASN file should NOT be applied to any fully qualified filename.
Assignments for FilenameSpecification is based on a 3 parts recognition.
general disk + directory specification separated by a colon ':' a slash '/' or a backslash '\'
type or extension separated by a dot (.)
All these parts can be specified separately to allow more flexible assignments. Therefore the problem mentioned here that specs loaded via a filebox are remapped due to assignment can simple avoided by be more specific in the assignment.
this will indeed map all files with the extension "bmp" to directory c:\bitmap but with the following assignments
*\*.bmp *\*.bmp *.bmp c:\bitmap\*.bmp
means that when a (bmp) file has a directory specification it will be mapped to its own, and only when there is no directory specification it will mapped to directory
This was just an example for bitmaps but a more common assignment will be:
[FILES] *\*.* *\*.* ; keep all files with disk/directory spec *.txt c:\text\*.txt ; map following by specific (defaults) *.bmp c:\bitmap\*.bmp ; map etc etc etc
2nd November 2001