examples

example.zig

const std = @import("std");

pub fn readFile(fp: []const u8) !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    // 拿到一个allocator
    const allocator = gpa.allocator();

    // defer 用于执行general_purpose_allocator善后工作
    defer {
        const deinit_status = gpa.deinit();

        if (deinit_status == .leak) @panic("TEST FAIL");
    }
    const fmt = std.io.getStdOut().writer();

    if (std.fs.cwd().openFile(fp, .{})) |file| {
        defer file.close();
        const stat = try file.stat();

        const buf = try allocator.alloc(u8, stat.size);
        defer allocator.free(buf);

        try file.seekTo(0);
        const i = try file.readAll(buf);
        try fmt.print("read length is {}\n", .{i});
        try fmt.print("file's content is {s}\n", .{buf});
    } else |err| {
        try fmt.print("open {s}: {}\n", .{ fp, err });
    }
}

pub fn main() !void {
    try readFile("1.txt");
}