(MFC) Send JSON REST Request, Get JSON Response

Demonstrates sending a RESTful JSON request, and receiving a JSON response. This example will create a bucket in Google Cloud Storage (which involves sending and receiving JSON).

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example will create a bucket in Google Cloud Storage.
    bool success;

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

    CkAuthGoogle gAuth;
    // 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

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access key)
    success = rest.SetAuthGoogle(gAuth);

    // 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..
    CkJsonObject jsonReqBody;
    success = jsonReqBody.AddStringAt(-1,"name","chilkat-bucket-c");
    success = jsonReqBody.AddStringAt(-1,"kind","storage#bucket");
    success = jsonReqBody.AddStringAt(-1,"location","US");
    success = jsonReqBody.AddObjectAt(-1,"versioning");

    CkJsonObject *pObjVersioning = jsonReqBody.ObjectOf("versioning");
    success = pObjVersioning->AddBoolAt(-1,"enabled",true);
    delete pObjVersioning;

    // Show the HTTP request body we'll be sending.
    strOut.append(jsonReqBody.emit());
    strOut.append("\r\n");

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

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

    const char *jsonResponseStr = rest.fullRequestString("POST","/storage/v1/b",jsonReqBody.emit());
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show the JSON response.  (See below for a sample JSON response.)
    strOut.append("Json Response: ");
    strOut.append(jsonResponseStr);
    strOut.append("\r\n");

    // {
    //  "kind": "storage#bucket",
    //  "id": "chilkat-bucket-c",
    //  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket-c",
    //  "projectNumber": "999992999999",
    //  "name": "chilkat-bucket-c",
    //  "timeCreated": "2016-04-29T21:08:10.451Z",
    //  "updated": "2016-04-29T21:08:10.451Z",
    //  "metageneration": "1",
    //  "owner": {
    //   "entity": "project-owners-999992999999"
    //  },
    //  "location": "US",
    //  "versioning": {
    //   "enabled": true
    //  },
    //  "storageClass": "STANDARD",
    //  "etag": "CAE="
    // }
    // 


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }