(Unicode C++) Facebook Upload Photo from Local File

Uploads a new photo with a caption from a local file.

Chilkat C/C++ Library Downloads
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#include <CkHttpW.h>
#include <CkHttpRequestW.h>
#include <CkHttpResponseW.h>

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

    CkHttpW http;

    CkHttpRequestW req;
    req.put_HttpVerb(L"POST");
    req.put_ContentType(L"multipart/form-data");
    req.put_Path(L"/v2.7/me/photos");

    // Use the previously obtained access token.
    // Note: The publish_actions scope is required to upload a photo.
    req.AddHeader(L"Authorization",L"Bearer FACEBOOK-ACCESS-TOKEN");

    // Send an "Expect: 100-continue" header in the request.
    // This causes the HTTP server to end a 100-continue response
    // immediately after receiving the HTTP header.  The client
    // (Chilkat) will receive this intermediate response, and if
    // it's not an error response, it knows that the HTTP server will
    // accept the data that is forthcoming.
    // The alternative is to get an error response after trying to upload
    // the entire contents of the files.
    req.AddHeader(L"Expect",L"100-continue");

    // Set a photo caption.
    req.AddParam(L"caption",L"Here are some penguins!");

    // Additional parameters can be added to the request by 
    // calling AddParam once per parameter.  
    // See https://developers.facebook.com/docs/graph-api/reference/user/photos
    // for more information about other optional parameters.

    // Indicate the local file to be uploaded.
    bool success = req.AddFileForUpload(L"source",L"qa_data/jpg/penguins2.jpg");
    if (success != true) {
        wprintf(L"%s\n",req.lastErrorText());
        return;
    }

    // Upload the image file..
    CkHttpResponseW *resp = http.SynchronousRequest(L"graph.facebook.com",443,true,req);
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // Examine the response body:
    const wchar_t *responseJson = resp->bodyStr();
    wprintf(L"%s\n",responseJson);

    // The response contains JSON, such as this:
    // {"id":"10210224963435862","post_id":"10224048320139890_10210224963435862"}

    delete resp;
    }