Zig Requires Chilkat v11.0.0+

Find a ZIP Entry by EntryID Using EntryById

See more Zip Examples

This example demonstrates how to use the EntryById method to retrieve a ZIP entry using its unique EntryID.

Each ZipEntry object has an EntryID property that uniquely identifies the entry within the currently open ZIP object.

This is useful when:

• An application stores EntryID values for later use
• ZIP entries need to be retrieved without searching by filename
• Multiple entries may have similar names or paths

The example:

• Opens a ZIP archive
• Retrieves an entry using EntryAt
• Saves the entry's EntryID
• Uses EntryById to retrieve the same entry later

Zig

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

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

    // Open an existing ZIP archive.
    const zip = try chilkat.Zip.init();
    defer zip.deinit();

    zip.openZip("example.zip") catch {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    };

    // Retrieve the first entry in the ZIP archive.
    const entry = try chilkat.ZipEntry.init();
    defer entry.deinit();

    zip.entryAt(0, entry) catch {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Original entry:\n", .{});
    std.debug.print("  FileName: {s}\n", .{try entry.getFileName(alloc)});
    std.debug.print("  EntryID: {d}\n", .{entry.getEntryID()});
    std.debug.print("\n", .{});

    // Save the EntryID for later use.
    const entry_id = entry.getEntryID();

    // Create another ZipEntry object.
    const entry2 = try chilkat.ZipEntry.init();
    defer entry2.deinit();

    // Retrieve the same entry using EntryById.
    zip.entryById(entry_id, entry2) catch {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Entry retrieved by EntryID:\n", .{});
    std.debug.print("  FileName: {s}\n", .{try entry2.getFileName(alloc)});
    std.debug.print("  EntryID: {d}\n", .{entry2.getEntryID()});
    std.debug.print("\n", .{});

    // The filenames and EntryID values should match.
    zip.closeZip();

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