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   ► KBDesktop Data...Paradox & Ob...ObjectPAL Co...OPAL: Commands   Print This     
  From the July 2010 Issue of Prestwood eMag
Paradox OPAL: Commands:
Finding the Path of a File
Posted 11 years ago on 6/3/2008
Take Away: ObjectPAL example where user selects a file and you extract the path.


With the FileSystem commands, you can change your working directory, manipulate files on a disk, get the time and date from a file, and so on.

Suppose that you want to add a routine to a button that opens up the Paradox browser, browse for a file, select a file, and place its full path in a field. (This task is harder than it should be.)

Step By Step

1. Create a new form with a field and a button on it. Name the field fldFile and label the button Browse (see Figure 2).

2. In the pushButton event, type lines 3--23.

 1: ;Button :: pushButton
 2: method pushButton(var eventInfo Event)
 3: var
 4:   sFilename  String
 5:   fbi  FileBrowserInfo
 6: endVar
 8: if fileBrowser(sFileName, fbi) then
 9: ;A File was selected.
10:else;If no file is selected,
11:  return  ;then return.
14:  ;Find path of file.
15:  switch
16:  case isDir(fbi.alias)
17:    : fldFile.value = fbi.alias + fbi.path + sFilename
18:  case sFilename.subStr(1,6) = ":PRIV:"
19:    : sFilename = sFilename.subStr(7, sFilename.size() - 6)
20:    fldFile.value = getAliasPath(":PRIV:") + "\\" + sFilename
21:  otherwise
22:    : fldFile.value = getAliasPath(fbi.alias) + "\\" + fbi.path + sFilename
23:   endSwitch
24: endMethod

3. Check the syntax, save the form as FINDPATH.FSL, and run it. Click the Browse button and choose a file. Try choosing files from the current working directory and from another directory using an alias.

In step 2, lines 3--6 declare an sFilename string variable to receive the name of the file in line 8 and an fbi FileBrowserInfo variable for use with fileBrowser(), also in line 8. Lines 15--23 determine the path of the file.


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