PowerBuilder

Unzip a ZIP Entry Directly into a BinData Object Using ZipEntry.UnzipToBd

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToBd method to inflate a ZIP entry directly into a BinData object.

The entry contents are uncompressed entirely in memory without creating a file on disk.

This is useful when:

• Processing ZIP entry data entirely in memory
• Avoiding temporary filesystem files
• Working with binary files such as images, PDFs, or certificates
• Passing uncompressed ZIP data directly to other APIs

The example opens a ZIP archive, locates a PDF entry, inflates it into a BinData object, and then writes the uncompressed bytes to a new file.

Suppose the ZIP archive contains:

docs/report.pdf

The entry is uncompressed directly into memory before optionally being saved to:

qa_output/report.pdf

PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Zip
oleobject loo_Entry
oleobject loo_PdfData

li_Success = 0

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

// Open an existing ZIP archive.
li_Success = loo_Zip.OpenZip("qa_data/zips/documents.zip")
if li_Success = 0 then
    Write-Debug loo_Zip.LastErrorText
    destroy loo_Zip
    return
end if

// Locate the PDF entry within the ZIP archive.
loo_Entry = create oleobject
li_rc = loo_Entry.ConnectToNewObject("Chilkat.ZipEntry")

li_Success = loo_Zip.EntryOf("docs/report.pdf",loo_Entry)
if li_Success = 0 then
    Write-Debug "ZIP entry not found."
    loo_Zip.CloseZip()
    destroy loo_Zip
    destroy loo_Entry
    return
end if

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a BinData object.
// 
// The uncompressed bytes are stored entirely in memory.
// 
loo_PdfData = create oleobject
li_rc = loo_PdfData.ConnectToNewObject("Chilkat.BinData")

li_Success = loo_Entry.UnzipToBd(loo_PdfData)
if li_Success = 0 then
    Write-Debug loo_Entry.LastErrorText
    destroy loo_Zip
    destroy loo_Entry
    destroy loo_PdfData
    return
end if

Write-Debug "Uncompressed size = " + string(loo_PdfData.NumBytes)
Write-Debug ""

// ------------------------------------------------------------
// Optionally save the uncompressed bytes to a file.
// 
li_Success = loo_PdfData.WriteFile("qa_output/report.pdf")
if li_Success = 0 then
    Write-Debug loo_PdfData.LastErrorText
    destroy loo_Zip
    destroy loo_Entry
    destroy loo_PdfData
    return
end if

loo_Zip.CloseZip()

Write-Debug "PDF extracted successfully."


destroy loo_Zip
destroy loo_Entry
destroy loo_PdfData