(MFC) Download Google Contact Photo

Demonstrates how to download Google Contact's photo.

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

See Also: Using MFC CString in Chilkat

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

void ChilkatSample(void)
    {
    CkString strOut;

    // 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) {
        strOut.append("Failed to load googleContacts.json");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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) {
        strOut.append("This contact has no photo.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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);

        strOut.append("response status code = ");
        strOut.appendInt(rest.get_ResponseStatusCode());
        strOut.append("\r\n");
        strOut.append("response status text = ");
        strOut.append(rest.responseStatusText());
        strOut.append("\r\n");
        strOut.append("response header: ");
        strOut.append(rest.responseHeader());
        strOut.append("\r\n");
        strOut.append("response body: ");
        strOut.append(sbResponseBody.getAsString());
        strOut.append("\r\n");
        strOut.append("request startline: ");
        strOut.append(rest.lastRequestStartLine());
        strOut.append("\r\n");
        strOut.append("request header: ");
        strOut.append(rest.lastRequestHeader());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        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");
    }

    strOut.append("Content-Type: ");
    strOut.append(sbContentType.getAsString());
    strOut.append("\r\n");
    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }