Zig Requires Chilkat v11.0.0+

Facebook Upload Photo from Local File

See more Facebook Examples

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

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example assumes Chilkat HTTP to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const http = try chilkat.Http.init();
    defer http.deinit();

    const req = try chilkat.HttpRequest.init();
    defer req.deinit();
    req.setHttpVerb("POST");
    req.setContentType("multipart/form-data");
    req.setPath("/v2.7/me/photos");

    // Use the previously obtained access token.
    // Note: The publish_actions scope is required to upload a photo.
    req.addHeader("Authorization", "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("Expect", "100-continue");

    // Set a photo caption.
    req.addParam("caption", "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.
    req.addFileForUpload("source", "qa_data/jpg/penguins2.jpg") catch {
        std.debug.print("{s}\n", .{try req.getLastErrorText(alloc)});
        return;
    };

    // Upload the image file..
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpSReq("graph.facebook.com", 443, true, req, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // Examine the response body:
    const response_json = try resp.getBodyStr(alloc);
    std.debug.print("{s}\n", .{response_json});

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