test_new_ffi_1.py 文件源码

def test_struct_packed(self):
        # struct nonpacked { char a; int b; };
        # struct is_packed { char a; int b; } __attribute__((packed));
        assert ffi.sizeof("struct nonpacked") == 8
        assert ffi.sizeof("struct is_packed") == 5
        assert ffi.alignof("struct nonpacked") == 4
        assert ffi.alignof("struct is_packed") == 1
        s = ffi.new("struct is_packed[2]")
        s[0].b = 42623381
        s[0].a = b'X'
        s[1].b = -4892220
        s[1].a = b'Y'
        assert s[0].b == 42623381
        assert s[0].a == b'X'
        assert s[1].b == -4892220
        assert s[1].a == b'Y'