Xbase++

OneDrive -- List Large Directory

See more OneDrive Examples

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 v9.5.0.97 or greater.

Xbase++

LOCAL nSuccess
LOCAL oJson
LOCAL oHttp
LOCAL cResp
LOCAL i
LOCAL nNumItems
LOCAL nBGetMore
LOCAL cNextLink

nSuccess := 0

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

//  This example uses the OAuth client credentials flow.
//  See How to Create an Azure App Registration for OAuth 2.0 Client Credentials

//  Use your client ID, client secret, and tenant ID in the following lines
oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("client_id", "2871da2c-8176-4b7f-869b-2311aa82e743")
oJson:UpdateString("client_secret", "2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH")
oJson:UpdateString("scope", "https://graph.microsoft.com/.default")
oJson:UpdateString("token_endpoint", "https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token")

oHttp := CreateObject("Chilkat.Http")
oHttp:AuthToken := oJson:Emit()

//  This example will get the DriveItems in /lots-of-files, which has 450 children..
oHttp:SetUrlVar("item_path", "/lots-of-files")
oHttp:SetUrlVar("user_id", "4fe732c3-322e-4a6b-b729-2fd1eb5c6104")

oJson:EmitCompact := 0

//  This loop will download DriveItems in sets of 25 until no more exist.
nBGetMore := 1
//  (Add the $top query parameter to define the page size, i.e. the max number of results to return).
cNextLink := "https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:{$item_path}:/children?$top=25"

DO WHILE (nBGetMore == 1)

    //  Get the next chunk of DriveItems
    cResp := oHttp:QuickGetStr(cNextLink)
    IF (oHttp:LastMethodSuccess != 1)
        ? oHttp:LastErrorText
        oJson:destroy()
        oHttp:destroy()
        RETURN
    ENDIF

    //  The response should be JSON.
    oJson:Load(cResp)

    //  A successful response should return a status code of 200.
    IF (oHttp:LastStatus != 200)
        ? oJson:Emit()
        ? "Response status = " + Str(oHttp:LastStatus)
        oJson:destroy()
        oHttp:destroy()
        RETURN
    ENDIF

    //  Iterate over the DriveItems in the JSON response:
    i := 0
    nNumItems := oJson:SizeOfArray("value")
    DO WHILE i < nNumItems
        oJson:I := i
        ? "name: " + oJson: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 (oJson:HasMember('"@odata.nextLink"') == 1)
        cNextLink := oJson:StringOf('"@odata.nextLink"')
        ? "nextLink: " + cNextLink
    ELSE
        nBGetMore := 0
    ENDIF

ENDDO

oJson:destroy()
oHttp:destroy()