(Unicode C++) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <CkJsonObjectW.h>
#include <CkAuthGoogleW.h>
#include <CkRestW.h>
#include <CkStringBuilderW.h>
#include <CkBinDataW.h>

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

    // --------------------------------------------------------------------------------------------------------
    // Note: The code for setting up the Chilkat REST object and making the initial connection can be done once.
    // Once connected, the REST object may be re-used for many REST API calls.
    // (It's a good idea to put the connection setup code in a separate function/subroutine.)
    // --------------------------------------------------------------------------------------------------------

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Google Contacts OAuth2 Access Token

    CkJsonObjectW jsonToken;
    bool success = jsonToken.LoadFile(L"qa_data/tokens/googleContacts.json");
    if (success != true) {
        wprintf(L"Failed to load googleContacts.json\n");
        return;
    }

    CkAuthGoogleW gAuth;
    gAuth.put_AccessToken(jsonToken.stringOf(L"access_token"));

    CkRestW rest;

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

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

    // ----------------------------------------------
    // OK, the REST connection setup is completed..
    // ----------------------------------------------

    // To get the photo, send the following:

    // 	GET /m8/feeds/photos/media/default/contactId

    rest.AddHeader(L"GData-Version",L"3.0");

    CkStringBuilderW sbPath;
    // Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
    const wchar_t *contactId = L"1ea2e4fe0ef24e09";
    sbPath.SetString(L"/m8/feeds/photos/media/default/{contactId}");
    int numReplacements = sbPath.Replace(L"{contactId}",contactId);

    CkBinDataW imageData;
    success = rest.FullRequestNoBodyBd(L"GET",sbPath.getAsString(),imageData);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // A 404 response indicates the contact has no photo.
    // (We could've first fetched the contact information, parsed out the 
    // photo etag, and then if no photo etag existed, we'd know the contact has no
    // photo.  Or... we can just try to download the photo and if a 404 is received,
    // we know there's no photo.  Much simpler.)
    if (rest.get_ResponseStatusCode() == 404) {
        wprintf(L"This contact has no photo.\n");
        return;
    }

    // A successful response will have a status code equal to 200.
    if (rest.get_ResponseStatusCode() != 200) {
        // If the response was not successful, then the response body
        // does not contain image data.  Instead it contains XML.
        CkStringBuilderW sbResponseBody;
        sbResponseBody.AppendBd(imageData,L"utf-8",0,0);

        wprintf(L"response status code = %d\n",rest.get_ResponseStatusCode());
        wprintf(L"response status text = %s\n",rest.responseStatusText());
        wprintf(L"response header: %s\n",rest.responseHeader());
        wprintf(L"response body: %s\n",sbResponseBody.getAsString());
        wprintf(L"request startline: %s\n",rest.lastRequestStartLine());
        wprintf(L"request header: %s\n",rest.lastRequestHeader());
        return;
    }

    // Examine the content-type in the response header so we know what file
    // extension to use (.jpg, .png, etc.)
    CkStringBuilderW sbContentType;
    sbContentType.Append(rest.responseHdrByName(L"Content-Type"));

    if (sbContentType.ContentsEqual(L"image/jpeg",false) == true) {
        imageData.WriteFile(L"qa_output/contact_photo.jpg");
    }

    if (sbContentType.ContentsEqual(L"image/png",false) == true) {
        imageData.WriteFile(L"qa_output/contact_photo.png");
    }

    wprintf(L"Content-Type: %s\n",sbContentType.getAsString());
    wprintf(L"Success.\n");
    }