(PowerBuilder) Decompress Gzip Data In-Place Using BinData

See more Gzip Examples

This example demonstrates how to use the UncompressBd method to decompress Gzip data stored in a BinData object.

The compressed .gz file is first loaded into memory. The UncompressBd method then decompresses the data in-place, meaning the original compressed bytes in the BinData object are replaced with the uncompressed data.

After decompression, the example writes the resulting data to a file. This approach is useful when working entirely in memory before saving or further processing the uncompressed data.

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integer li_rc
integer li_Success
oleobject loo_Gzip
oleobject loo_Bd

li_Success = 0

// This example demonstrates how to decompress Gzip data stored in a BinData object.
// The decompression is done in-place, replacing the compressed data with the original data.

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

// Load a .gz file into BinData:
li_Success = loo_Bd.LoadFile("example.txt.gz")
if li_Success = 0 then
    Write-Debug loo_Bd.LastErrorText
    destroy loo_Gzip
    destroy loo_Bd
    return
end if

Write-Debug "Compressed size (bytes): " + string(loo_Bd.NumBytes)

// Uncompress the data in-place:
li_Success = loo_Gzip.UncompressBd(loo_Bd)
if li_Success = 0 then
    Write-Debug loo_Gzip.LastErrorText
    destroy loo_Gzip
    destroy loo_Bd
    return
end if

Write-Debug "Decompressed size (bytes): " + string(loo_Bd.NumBytes)

// Save the uncompressed data to a file:
li_Success = loo_Bd.WriteFile("example.txt")
if li_Success = 0 then
    Write-Debug loo_Bd.LastErrorText
    destroy loo_Gzip
    destroy loo_Bd
    return
end if

Write-Debug "File successfully uncompressed to example.txt"


destroy loo_Gzip
destroy loo_Bd