(Unicode C) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

Chilkat C/C++ Library Downloads
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#include <C_CkJsonObjectW.h>
#include <C_CkAuthGoogleW.h>
#include <C_CkRestW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW jsonToken;
    BOOL success;
    HCkAuthGoogleW gAuth;
    HCkRestW rest;
    BOOL bAutoReconnect;
    HCkStringBuilderW sbPath;
    const wchar_t *contactId;
    int numReplacements;
    HCkBinDataW imageData;
    HCkStringBuilderW sbResponseBody;
    HCkStringBuilderW sbContentType;

    // 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

    jsonToken = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(jsonToken,L"qa_data/tokens/googleContacts.json");
    if (success != TRUE) {
        wprintf(L"Failed to load googleContacts.json\n");
        CkJsonObjectW_Dispose(jsonToken);
        return;
    }

    gAuth = CkAuthGoogleW_Create();
    CkAuthGoogleW_putAccessToken(gAuth,CkJsonObjectW_stringOf(jsonToken,L"access_token"));

    rest = CkRestW_Create();

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

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

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

    // To get the photo, send the following:

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

    CkRestW_AddHeader(rest,L"GData-Version",L"3.0");

    sbPath = CkStringBuilderW_Create();
    // Get the photo for the contact having contactId = "1ea2e4fe0ef24e09"
    contactId = L"1ea2e4fe0ef24e09";
    CkStringBuilderW_SetString(sbPath,L"/m8/feeds/photos/media/default/{contactId}");
    numReplacements = CkStringBuilderW_Replace(sbPath,L"{contactId}",contactId);

    imageData = CkBinDataW_Create();
    success = CkRestW_FullRequestNoBodyBd(rest,L"GET",CkStringBuilderW_getAsString(sbPath),imageData);
    if (success != TRUE) {
        wprintf(L"%s\n",CkRestW_lastErrorText(rest));
        CkJsonObjectW_Dispose(jsonToken);
        CkAuthGoogleW_Dispose(gAuth);
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbPath);
        CkBinDataW_Dispose(imageData);
        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 (CkRestW_getResponseStatusCode(rest) == 404) {
        wprintf(L"This contact has no photo.\n");
        CkJsonObjectW_Dispose(jsonToken);
        CkAuthGoogleW_Dispose(gAuth);
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbPath);
        CkBinDataW_Dispose(imageData);
        return;
    }

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

        wprintf(L"response status code = %d\n",CkRestW_getResponseStatusCode(rest));
        wprintf(L"response status text = %s\n",CkRestW_responseStatusText(rest));
        wprintf(L"response header: %s\n",CkRestW_responseHeader(rest));
        wprintf(L"response body: %s\n",CkStringBuilderW_getAsString(sbResponseBody));
        wprintf(L"request startline: %s\n",CkRestW_lastRequestStartLine(rest));
        wprintf(L"request header: %s\n",CkRestW_lastRequestHeader(rest));
        CkJsonObjectW_Dispose(jsonToken);
        CkAuthGoogleW_Dispose(gAuth);
        CkRestW_Dispose(rest);
        CkStringBuilderW_Dispose(sbPath);
        CkBinDataW_Dispose(imageData);
        CkStringBuilderW_Dispose(sbResponseBody);
        return;
    }

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

    if (CkStringBuilderW_ContentsEqual(sbContentType,L"image/jpeg",FALSE) == TRUE) {
        CkBinDataW_WriteFile(imageData,L"qa_output/contact_photo.jpg");
    }

    if (CkStringBuilderW_ContentsEqual(sbContentType,L"image/png",FALSE) == TRUE) {
        CkBinDataW_WriteFile(imageData,L"qa_output/contact_photo.png");
    }

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


    CkJsonObjectW_Dispose(jsonToken);
    CkAuthGoogleW_Dispose(gAuth);
    CkRestW_Dispose(rest);
    CkStringBuilderW_Dispose(sbPath);
    CkBinDataW_Dispose(imageData);
    CkStringBuilderW_Dispose(sbResponseBody);
    CkStringBuilderW_Dispose(sbContentType);

    }