(PowerBuilder) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

Note: This example requires Chilkat v11.0.0 or greater.

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integer li_rc
integer li_Success
oleobject loo_Zip
oleobject loo_Zip2
oleobject loo_Entry

li_Success = 0

// ------------------------------------------------------------
// First create a sample ZIP archive containing a small text file.

loo_Zip = create oleobject
li_rc = loo_Zip.ConnectToNewObject("Chilkat.Zip")
if li_rc < 0 then
    destroy loo_Zip
    MessageBox("Error","Connecting to COM object failed")
    return
end if

li_Success = loo_Zip.NewZip("c:/temp/sampleText.zip")
if li_Success = 0 then
    Write-Debug loo_Zip.LastErrorText
    destroy loo_Zip
    return
end if

// Add a small text file from memory.
li_Success = loo_Zip.AddString("myApp/docs/hello.txt","Hello from a ZIP entry!","utf-8")
if li_Success = 0 then
    Write-Debug loo_Zip.LastErrorText
    destroy loo_Zip
    return
end if

// Write the ZIP archive to disk and close it.
li_Success = loo_Zip.WriteZipAndClose()
if li_Success = 0 then
    Write-Debug loo_Zip.LastErrorText
    destroy loo_Zip
    return
end if

// ------------------------------------------------------------
// Now open the ZIP archive we just created.

loo_Zip2 = create oleobject
li_rc = loo_Zip2.ConnectToNewObject("Chilkat.Zip")

li_Success = loo_Zip2.OpenZip("c:/temp/sampleText.zip")
if li_Success = 0 then
    Write-Debug loo_Zip2.LastErrorText
    destroy loo_Zip
    destroy loo_Zip2
    return
end if

// Find the entry by its stored ZIP path.
loo_Entry = create oleobject
li_rc = loo_Entry.ConnectToNewObject("Chilkat.ZipEntry")

li_Success = loo_Zip2.EntryOf("myApp/docs/hello.txt",loo_Entry)

if li_Success = 0 then
    Write-Debug "Entry not found."
    destroy loo_Zip
    destroy loo_Zip2
    destroy loo_Entry
    return
end if

// Extract this single entry to the base directory:
// 
//     c:/temp/extracted
// 
// Because the entry's stored path is:
// 
//     myApp/docs/hello.txt
// 
// the file will be extracted to:
// 
//     qa_output/extracted/myApp/docs/hello.txt
// 
// The required subdirectories are created automatically.
li_Success = loo_Entry.Extract("c:/temp/extracted")
if li_Success = 0 then
    Write-Debug loo_Entry.LastErrorText
    destroy loo_Zip
    destroy loo_Zip2
    destroy loo_Entry
    return
end if

loo_Zip2.CloseZip()

Write-Debug "Entry extracted successfully."


destroy loo_Zip
destroy loo_Zip2
destroy loo_Entry