B4X Requires Chilkat v11.0.0+

Find ZIP Entries Matching a Wildcard Pattern Using EntryMatching

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This example demonstrates how to use the EntryMatching method to find ZIP entries whose stored paths match a wildcard pattern.

The wildcard character * matches zero or more characters. The comparison is performed against the full stored path within the ZIP archive.

This method is useful for:

• Finding files having a particular extension
• Locating files within specific subdirectories
• Searching ZIP archives without manually iterating through every entry

Suppose the ZIP archive contains:

docs/
docs/readme.txt
docs/manual.pdf
images/logo.png
images/banner.jpg
data/config/settings.json

Notice that the ZIP archive contains an explicit directory entry named docs/. ZIP archives may optionally contain separate directory entries in addition to file entries.

When searching with the pattern docs/*, the first matching entry could therefore be the directory entry docs/ rather than a file contained within that directory.

The example searches for:

• The first .png file
• The first entry beneath the docs directory
• The first JSON file anywhere within the ZIP archive

B4X

Dim success As Boolean = False

'  Open an existing ZIP archive.
Dim zip As ChilkatZip
zip.Initialize("zip")

success = zip.OpenZip("example.zip")
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


Dim entry As ChilkatZipEntry
entry.Initialize("entry")

'  ------------------------------------------------------------
'  Find the first .png file in the ZIP archive.

success = zip.EntryMatching("*.png", entry)

If success = True Then
    Log("Found PNG file:")
    Log("  " & entry.FileName)
    Log("")
End If


'  ------------------------------------------------------------
'  Find the first entry beneath the docs directory.
'  
'  Note: ZIP archives may optionally contain explicit directory
'  entries such as "docs/" in addition to file entries.
'  Therefore, the first matching entry could be the directory
'  itself rather than a file contained within the directory.

success = zip.EntryMatching("docs/*", entry)

If success = True Then
    Log("First matching docs entry:")
    Log("  " & entry.FileName)
    Log("  IsDirectory = " & entry.IsDirectory)
    Log("")
End If


'  ------------------------------------------------------------
'  Find the first JSON file anywhere in the ZIP archive.

success = zip.EntryMatching("*.json", entry)

If success = True Then
    Log("Found JSON file:")
    Log("  " & entry.FileName)
    Log("")
End If


'  ------------------------------------------------------------
'  The matching is performed against the full stored ZIP path.
'  For example:
'  
'      docs/readme.txt
'      images/logo.png
'      data/config/settings.json
'  
'  The wildcard '*' matches zero or more characters.

zip.CloseZip

Log("Done.")