Zig Requires Chilkat v11.0.0+

Remove an Entry from an Existing ZIP Using DeleteEntry

See more Zip Examples

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

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;

    // ------------------------------------------------------------
    // First create a ZIP archive containing three text files.

    const zip = try chilkat.Zip.init();
    defer zip.deinit();

    success = if (zip.newZip("original.zip")) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    }

    const charset = "utf-8";

    success = if (zip.addString("a.txt", "Contents of file A", charset)) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    }

    success = if (zip.addString("b.txt", "Contents of file B", charset)) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    }

    success = if (zip.addString("c.txt", "Contents of file C", charset)) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    }

    // Write the ZIP archive to disk.
    //
    // The ZIP now contains:
    //
    //     a.txt
    //     b.txt
    //     c.txt
    //
    success = if (zip.writeZipAndClose()) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip.getLastErrorText(alloc)});
        return;
    }

    // ------------------------------------------------------------
    // Open the existing ZIP archive for modification.

    const zip2 = try chilkat.Zip.init();
    defer zip2.deinit();

    success = if (zip2.openZip("original.zip")) true else |_| false;
    if (!success) {
        std.debug.print("{s}\n", .{try zip2.getLastErrorText(alloc)});
        return;
    }

    // Find the entry named "b.txt".
    const entry = try chilkat.ZipEntry.init();
    defer entry.deinit();

    success = zip2.entryOf("b.txt", entry);
    if (!success) {
        std.debug.print("{s}\n", .{try zip2.getLastErrorText(alloc)});
        return;
    }

    // Remove the entry from the in-memory ZIP object.
    //
    // At this point, the original ZIP file on disk is unchanged.
    // The deletion takes effect only after WriteZip or
    // WriteZipAndClose is called.
    zip2.deleteEntry(entry) catch {
        std.debug.print("{s}\n", .{try zip2.getLastErrorText(alloc)});
        return;
    };

    // Write the modified ZIP archive to a new file.
    zip2.setFileName("modified.zip");

    zip2.writeZipAndClose() catch {
        std.debug.print("{s}\n", .{try zip2.getLastErrorText(alloc)});
        return;
    };

    // The modified ZIP now contains:
    //
    //     a.txt
    //     c.txt
    //

    std.debug.print("ZIP archive updated successfully.\n", .{});
}