Zig

Outlook --Download Attachments for a Specific Message

See more Outlook Examples

Demonstrates how to download the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com

Zig

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

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

    var success: bool = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

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

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    http.setAuthToken("MICROSOFT_GRAPH_ACCESS_TOKEN");

    const sb_response = try chilkat.StringBuilder.init();
    defer sb_response.deinit();

    // Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
    // Note: It is also possible to use the literal string "me" for the current logged-on user.
    // For example: GET /me/messages/{message_id}/attachments

    http.clearUrlVars();
    http.setUrlVar("userPrincipalName", "chilkatsoft@outlook.com") catch {};

    // Assume we already have a message ID from previously listing the messages in a folder
    const message_id = "AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA=";
    http.setUrlVar("message_id", message_id) catch {};

    // Send the request to download the attachments.
    success = if (http.quickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments", sb_response)) true else |_| false;
    if ((!success) and (http.getLastStatus() == 0)) {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    }

    // The attachment data is contained within the JSON response.
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadSb(sb_response) catch {};
    json.setEmitCompact(false);

    std.debug.print("Status code = {d}\n", .{http.getLastStatus()});
    if (http.getLastStatus() != 200) {
        std.debug.print("{s}\n", .{try json.emit(alloc)});
        std.debug.print("Failed.\n", .{});
    }

    // This is a sample JSON response.  The code for parsing and extracting/saving the attachments
    // is shown below.

    //     {
    //       "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
    //       "value": [
    //         {
    //           "@odata.type": "#microsoft.graph.fileAttachment",
    //           "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
    //           "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    //           "name": "fishing.pdf",
    //           "contentType": "application/pdf",
    //           "size": 295680,
    //           "isInline": false,
    //           "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
    //           "contentLocation": null,
    //           "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
    //         },
    //         {
    //           "@odata.type": "#microsoft.graph.fileAttachment",
    //           "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
    //           "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    //           "name": "testCert.cer",
    //           "contentType": "application/octet-stream",
    //           "size": 1674,
    //           "isInline": false,
    //           "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
    //           "contentLocation": null,
    //           "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
    //         }
    //       ]
    //     }

    const sb_save_path = try chilkat.StringBuilder.init();
    defer sb_save_path.deinit();
    const attach_data = try chilkat.BinData.init();
    defer attach_data.deinit();
    const last_mod = try chilkat.DateTime.init();
    defer last_mod.deinit();
    const fac = try chilkat.FileAccess.init();
    defer fac.deinit();

    var i: i32 = 0;
    const num_messages = json.sizeOfArray("value");
    while (i < num_messages) {
        json.setI(i);

        std.debug.print("name: {s}\n", .{try json.stringOf(alloc, "value[i].name")});
        std.debug.print("contentType: {s}\n", .{try json.stringOf(alloc, "value[i].contentType")});
        const size_in_bytes = json.intOf("value[i].size");
        std.debug.print("size: {d}\n", .{size_in_bytes});

        // Extract the data and save to a file.
        sb_save_path.setString("qa_output/") catch {};
        sb_save_path.append(try json.stringOf(alloc, "value[i].name")) catch {};

        attach_data.clear() catch {};
        attach_data.appendEncoded(try json.stringOf(alloc, "value[i].contentBytes"), "base64") catch {};
        attach_data.writeFile(try sb_save_path.getAsString(alloc)) catch {};

        // Get the last-modified date/time and set the output file's last-mod date/time..
        last_mod.setFromTimestamp(try json.stringOf(alloc, "value[i].lastModifiedDateTime")) catch {};
        fac.setLastModified(try sb_save_path.getAsString(alloc), last_mod) catch {};

        std.debug.print("----\n", .{});

        i = i + 1;
    }

    // The output of the above loop is:
    //
    //     name: fishing.pdf
    //     contentType: application/pdf
    //     size: 295680
    //     ----
    //     name: testCert.cer
    //     contentType: application/octet-stream
    //     size: 1674
    //     ----
    //
}