PowerShell

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

PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$success = $false

# Open an existing ZIP archive.
$zip = New-Object Chilkat.Zip

$success = $zip.OpenZip("example.zip")
if ($success -eq $false) {
    $($zip.LastErrorText)
    exit
}

$entry = New-Object Chilkat.ZipEntry

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

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

if ($success -eq $true) {
    $("Found PNG file:")
    $("  " + $entry.FileName)
    $("")
}

# ------------------------------------------------------------
# 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 -eq $true) {
    $("First matching docs entry:")
    $("  " + $entry.FileName)
    $("  IsDirectory = " + $entry.IsDirectory)
    $("")
}

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

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

if ($success -eq $true) {
    $("Found JSON file:")
    $("  " + $entry.FileName)
    $("")
}

# ------------------------------------------------------------
# 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()

$("Done.")