PowerBuilder

Fetch Web Pages from Local Cache

See more HTTP Examples

Demonstrates how to keep a local cache to avoid re-fetching web pages. PowerBuilder

integer li_rc
oleobject loo_Http
string ls_Html

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

// Define a cache directory and set the number of levels based on the anticipated size of the cache.
loo_Http.AddCacheRoot("c:/example/httpCache/")

// up to 256 sub-directories under the cache root will be created as needed to hold cached GET's.
loo_Http.NumCacheLevels = 1

// Tell the http object to fetch from the cache if possible.
loo_Http.FetchFromCache = 1

// Also tell the http object to update the cache with newly fetched pages.
loo_Http.UpdateCache = 1

// This HTTP GET should result in a cache file getting created.
ls_Html = loo_Http.QuickGetStr("https://www.google.com/")
if loo_Http.LastMethodSuccess = 0 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Http
    return
end if

// The 1st GET was not from cache:
Write-Debug "Fetched from cache: " + string(loo_Http.LastFromCache)

// Fetching again will cause the page to be delivered from our local cache.
ls_Html = loo_Http.QuickGetStr("https://www.google.com/")
if loo_Http.LastMethodSuccess = 0 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_Http
    return
end if

// The 2nd GET is from cache:
Write-Debug "Fetched from cache: " + string(loo_Http.LastFromCache)


destroy loo_Http