Chilkat Examples

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(Visual FoxPro) Lower-Level REST API Methods (Google Cloud Storage)

The FullRequest* methods, such as FullRequestBinary, FullRequestMultipart, FullRequestNoBody, FullRequestStream, FullRequestString, etc. are high-level REST API methods that both send the request and receive the response. It is often the case that an application needs make a REST call, but with a finer level of control. The Chilkat REST API provides this feature. An application can break a REST call into the following parts:

  1. Send the HTTP request. (via the SendReq* methods)
  2. Receive the HTTP response header. (ReadResponseHeader)
  3. Receive the HTTP response body. (via the ReadRespBody* methods)

This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loGAuth
LOCAL loRest
LOCAL lnBAutoReconnect
LOCAL loJsonReqBody
LOCAL loPObjVersioning
LOCAL lnResponseStatusCode
LOCAL lcResponseBodyStr

*  This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
*  It will create a bucket in Google Cloud Storage.

*  It requires the Chilkat API to have been previously unlocked.
*  See Global Unlock Sample for sample code.

loGAuth = CreateObject('Chilkat_9_5_0.AuthGoogle')
*  Obtain an access token as shown in one of the following examples:
*  See Get Access Token using a Service Account JSON Key
*  See Get Access Token using a P12 File

loRest = CreateObject('Chilkat_9_5_0.Rest')

*  Connect using TLS.
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("www.googleapis.com",443,1,lnBAutoReconnect)

*  Provide the authentication credentials (i.e. the access key)
lnSuccess = loRest.SetAuthGoogle(loGAuth)

*  Build the JSON request body for creating a bucket.
*  The only required property is the "name", but we'll add more
*  to make a better example..
loJsonReqBody = CreateObject('Chilkat_9_5_0.JsonObject')
lnSuccess = loJsonReqBody.AddStringAt(-1,"name","chilkat-bucket-c")
lnSuccess = loJsonReqBody.AddStringAt(-1,"kind","storage#bucket")
lnSuccess = loJsonReqBody.AddStringAt(-1,"location","US")
lnSuccess = loJsonReqBody.AddObjectAt(-1,"versioning")

loPObjVersioning = loJsonReqBody.ObjectOf("versioning")
lnSuccess = loPObjVersioning.AddBoolAt(-1,"enabled",1)
RELEASE loPObjVersioning

*  Show the HTTP request body we'll be sending.
? loJsonReqBody.Emit()

*  Add the required query parameter.
*  See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert
lnSuccess = loRest.AddQueryParam("project","chilkattest-1050")

*  Add the Content-Type HTTP request header.
lnSuccess = loRest.AddHeader("Content-Type","application/json; charset=UTF-8")

*  Send the REST HTTP request.
lnSuccess = loRest.SendReqStringBody("POST","/storage/v1/b",loJsonReqBody.Emit())
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJsonReqBody
    CANCEL
ENDIF

*  Read the response header.
lnResponseStatusCode = loRest.ReadResponseHeader()
IF (lnResponseStatusCode < 0) THEN
    *  We were unable to receive the response header.
    ? loRest.LastErrorText
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJsonReqBody
    CANCEL
ENDIF

IF (lnResponseStatusCode <> 200) THEN
    *  The response was not successful.  We'll still need to receive
    *  the response body, which may contain an error message from the server.
    *  If the response has no body, then the method for reading the
    *  response body can still be called.  It will simply return with an empty
    *  response body.

    *  We can examine the response header and status text:
    ? "Response status text: " + loRest.ResponseStatusText
    ? "Response header: " + loRest.ResponseHeader
ENDIF

*  Read the response body.  In this case we're expecting it to be JSON..
lcResponseBodyStr = loRest.ReadRespBodyString()
IF (loRest.LastMethodSuccess <> 1) THEN
    *  We were unable to receive the response body.
    *  Note: If the response did not include a body (such as for cases where
    *  the Content-Length header is 0, or if the response status code implicitly
    *  indicates no body, then ReadRespBodyString returns cktrue, and the
    *  responseBodyString will be an empty string.
    ? loRest.LastErrorText
    RELEASE loGAuth
    RELEASE loRest
    RELEASE loJsonReqBody
    CANCEL
ENDIF

*  Show the JSON response.
? "Json Response: " + lcResponseBodyStr

RELEASE loGAuth
RELEASE loRest
RELEASE loJsonReqBody


 

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