lua table操作详解

本文转自 http://hi.baidu.com/zengfazhou/item/7733ae03eab83d334ac4a3c0

lua_gettable

lua_getglobal(L, "mytable") <== push mytable

lua_pushnumber(L, 1) <== push key 1

lua_gettable(L, -2) <== pop key 1, push mytable[1]

lua_settable

lua_getglobal(L, "mytable") <== push mytable

lua_pushnumber(L, 1) <== push key 1

lua_pushstring(L, "abc") <== push value "abc"

lua_settable(L, -3) <== mytable[1] = "abc", pop key & value

lua_rawget

用法同lua_gettable,但更快(因为当key不存在时不用访问元方法__index)

lua_rawset

用法同lua_settable,但更快(因为当key不存在时不用访问元方法__newindex)

lua_rawgeti必须为数值键

lua_getglobal(L, "mytable") <== push mytable

lua_rawgeti(L, -1, 1) <== push mytable[1]，作用同下面两行调用

--lua_pushnumber(L, 1) <== push key 1

--lua_rawget(L,-2) <== pop key 1, push mytable[1]

lua_rawseti必须为数值键

lua_getglobal(L, "mytable") <== push mytable

lua_pushstring(L, "abc") <== push value "abc"

lua_rawseti(L, -2, 1) <== mytable[1] = "abc", pop value "abc"

lua_getfield必须为字符串键

lua_getglobal(L, "mytable") <== push mytable

lua_getfield(L, -1, "x") <== push mytable["x"]，作用同下面两行调用

--lua_pushstring(L, "x") <== push key "x"

--lua_gettable(L,-2) <== pop key "x", push mytable["x"]

lua_setfield必须为字符串键

lua_getglobal(L, "mytable") <== push mytable

lua_pushstring(L, "abc") <== push value "abc"

lua_setfield(L, -2, "x") <== mytable["x"] = "abc", pop value "abc"