(C++) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat C/C++ Library Downloads
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#include <CkJsonObject.h>
#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkStringBuilder.h>
#include <CkBinData.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

    CkJsonObject jsonToken;
    bool success = jsonToken.LoadFile("qa_data/tokens/googleContacts.json");
    if (success != true) {
        std::cout << "Failed to load googleContacts.json" << "\r\n";
        return;
    }

    CkAuthGoogle gAuth;
    gAuth.put_AccessToken(jsonToken.stringOf("access_token"));

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("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("GData-Version","3.0");

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

    CkBinData imageData;
    success = rest.FullRequestNoBodyBd("GET",sbPath.getAsString(),imageData);
    if (success != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        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) {
        std::cout << "This contact has no photo." << "\r\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.
        CkStringBuilder sbResponseBody;
        sbResponseBody.AppendBd(imageData,"utf-8",0,0);

        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        std::cout << "response body: " << sbResponseBody.getAsString() << "\r\n";
        std::cout << "request startline: " << rest.lastRequestStartLine() << "\r\n";
        std::cout << "request header: " << rest.lastRequestHeader() << "\r\n";
        return;
    }

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

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

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

    std::cout << "Content-Type: " << sbContentType.getAsString() << "\r\n";
    std::cout << "Success." << "\r\n";
    }