Zig

Get a Header Field of a Related Item

Demonstrates the Chilkat Email.GetRelatedHeader method, which returns the value of a named header field of a related item. The first argument is the zero-based related-item index and the second is the MIME header-field name. This example reads the Content-Type header of a related style sheet.

Background: Each related item is a MIME part with its own header block. Where GetRelatedAttr extracts a single named parameter from a header, GetRelatedHeader returns the entire value of a header field — for example the full Content-Type or Content-Location line — which is handy for inspecting exactly how an embedded resource is described.

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

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

    // Demonstrates the GetRelatedHeader method, which returns the value of a header field (by
    // name) of a related item.  The first argument is the zero-based related-item index and the
    // second is the MIME header-field name.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("GetRelatedHeader example");

    // Set an HTML body and add a related style sheet (index 0).
    email.setHtmlBody("<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>");
    email.addRelatedString2("styles.css", "body { color: navy; }", "utf-8");

    // Get the Content-Type header of the first related item (index 0).
    const ct = try email.getRelatedHeader(alloc, 0, "Content-Type");
    std.debug.print("Related item 0 Content-Type: {s}\n", .{ct});
}