(Lianja) OneDrive -- List Large Directory

Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

Note: This example requires Chilkat v9.5.0.68 or greater.

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

loHttp = createobject("CkHttp")

// Use your previously obtained access token here:
// See the following examples for getting an access token:
//    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
//    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
//    Refresh Access Token (Azure AD v2.0 Endpoint).
//    Refresh Access Token (Azure AD Endpoint).

// (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
loHttp.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"

// This example will get the DriveItems in /lots-of-files, which has 450 children..
loHttp.SetUrlVar("item_path","/lots-of-files")

loJson = createobject("CkJsonObject")
loJson.EmitCompact = .F.

// This loop will download DriveItems in sets of 50 until no more exist.
llBGetMore = .T.
// (Add the $top query parameter to define the page size, i.e. the max number of results to return).
lcNextLink = "https://graph.microsoft.com/v1.0/me/drive/root:{$item_path}:/children?$top=50"

do while (llBGetMore = .T.)

    // Get the next chunk of DriveItems
    lcResp = loHttp.QuickGetStr(lcNextLink)
    if (loHttp.LastMethodSuccess <> .T.) then
        ? loHttp.LastErrorText
        release loHttp
        release loJson
        return
    endif

    // The response should be JSON.
    loJson.Load(lcResp)

    // A successful response should return a status code of 200.
    if (loHttp.LastStatus <> 200) then
        ? loJson.Emit()
        ? "Response status = " + str(loHttp.LastStatus)
        release loHttp
        release loJson
        return
    endif

    // Iterate over the DriveItems in the JSON response:
    i = 0
    lnNumItems = loJson.SizeOfArray("value")
    do while i < lnNumItems
        loJson.I = i
        ? "name: " + loJson.StringOf("value[i].name")
        i = i + 1
    enddo

    // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
    // Otherwise, exit the loop.
    if (loJson.HasMember('"@odata.nextLink"') = .T.) then
        lcNextLink = loJson.StringOf('"@odata.nextLink"')
        ? "nextLink: " + lcNextLink
    else
        llBGetMore = .F.
    endif

enddo


release loHttp
release loJson