C/C++访问Lua中table元素方法总结

方式一：

访问key为数字的table

extern "C"{

#include <lua.h>

#include <lualib.h>

#include <lauxlib.h>

};

#pragma comment(lib,"lua5.1.lib")

int main()

{

lua_State* L = luaL_newstate();

if (luaL_loadstring(L,"back= { 0.30, 0.10, 0 }")

|| lua_pcall(L,0,0,0)) {

printf("Error Msg is %s.\n",lua_tostring(L,-1));

return -1;

}

// if (luaL_dofile(L,"test.lua")) {

// printf("Error Msg is %s.\n",lua_tostring(L,-1));

// return -1;

// }

lua_getglobal(L,"back");

if (!lua_istable(L,-1)) {

printf("'background' is not a table.\n" );

return -1;

}

int size=lua_objlen(L,-1);

for (int i=1;i<=size;i++)

{

lua_pushnumber(L,i);

lua_gettable(L,-2);

printf("%f\n",lua_tonumber(L,-1));

lua_pop(L,1);

}

lua_close(L);

return 0;

}

方式二：

访问key为字符串等任意的table

extern "C"{

#include <lua.h>

#include <lualib.h>

#include <lauxlib.h>

};

#pragma comment(lib,"lua5.1.lib")

int main()

{

lua_State* L = luaL_newstate();

if (luaL_loadstring(L,"back= { r=0.30, g=0.10, b=0 }")

|| lua_pcall(L,0,0,0)) {

printf("Error Msg is %s.\n",lua_tostring(L,-1));

return -1;

}

// if (luaL_dofile(L,"test.lua")) {

// printf("Error Msg is %s.\n",lua_tostring(L,-1));

// return -1;

// }

lua_getglobal(L,"back");

if (!lua_istable(L,-1)) {

printf("'background' is not a table.\n" );

return -1;

}

// int size=lua_objlen(L,-1);

// for (int i=1;i<=size;i++)

// {

// lua_pushnumber(L,i);

// lua_gettable(L,-2);

// printf("%f\n",lua_tonumber(L,-1));

// lua_pop(L,1);

// }

lua_pushnil(L);

while (lua_next(L,-2))

{

printf("%f\n",lua_tonumber(L,-1));

lua_pop(L,1);

}

lua_close(L);

return 0;

}

方式三：/article/10511464.html

C/C++听过key(键)或index（索引）来访问和修改Lua中的Table的内容

WriteLuaTable.lua

luat_Test1={a=123, b=456, c=789} luat_Test2={123, 456, 789}

WriteLuaTable.cpp

#include <lua.hpp> static void WriteTableFromKey(lua_State *L, const char* lpszTableName, const char* lpszTableItem, int nVal) { lua_getglobal(L, lpszTableName); lua_pushnumber(L, nVal); lua_setfield(L, -2, lpszTableItem); lua_pop(L, 1); } static void WriteTableFromIndex(lua_State *L, const char* lpszTableName, int index, int nVal) { lua_getglobal(L, lpszTableName); lua_pushnumber(L, nVal); lua_rawseti(L, -2, index); lua_pop(L, 1); } static void ReadTableFromKey(lua_State *L, const char* lpszTableName, const char* lpszTableItem) { lua_getglobal(L, lpszTableName); lua_pushstring(L, lpszTableItem); lua_gettable(L, -2); printf("%s.%s=%d\n", lpszTableName, lpszTableItem, (int)lua_tonumber(L, -1)); lua_pop(L, 2); } static void ReadTableFromIndex(lua_State *L, const char* lpszTableName, int index) { lua_getglobal(L, lpszTableName); lua_rawgeti(L, -1, index); printf("%s[%d]=%d\n", lpszTableName, index, (int)lua_tonumber(L, -1)); lua_pop(L, 2); } int main (int argc, char* argv[]) { lua_State *L = lua_open(); luaopen_base(L); luaL_dofile(L, "WriteLuaTable.lua"); ReadTableFromKey(L, "luat_Test1", "a"); ReadTableFromKey(L, "luat_Test1", "b"); ReadTableFromKey(L, "luat_Test1", "c"); puts("\n"); WriteTableFromKey(L, "luat_Test1", "a", 147); // luat_Test1['a'] = 147 WriteTableFromKey(L, "luat_Test1", "b", 258); // luat_Test1['b'] = 258 WriteTableFromKey(L, "luat_Test1", "c", 369); // luat_Test1['c'] = 369 WriteTableFromKey(L, "luat_Test1", "d", 159); // luat_Test1['d'] = 159 ReadTableFromKey(L, "luat_Test1", "a"); ReadTableFromKey(L, "luat_Test1", "b"); ReadTableFromKey(L, "luat_Test1", "c"); ReadTableFromKey(L, "luat_Test1", "d"); puts("\n--------------------------"); ReadTableFromIndex(L, "luat_Test2", 1); ReadTableFromIndex(L, "luat_Test2", 2); ReadTableFromIndex(L, "luat_Test2", 3); puts("\n"); WriteTableFromIndex(L, "luat_Test2", 1, 147); // luat_Test2[1] = 147 WriteTableFromIndex(L, "luat_Test2", 2, 258); // luat_Test2[2] = 258 WriteTableFromIndex(L, "luat_Test2", 3, 369); // luat_Test2[3] = 369 WriteTableFromIndex(L, "luat_Test2", 4, 159); // luat_Test2[4] = 159 ReadTableFromIndex(L, "luat_Test2", 1); ReadTableFromIndex(L, "luat_Test2", 2); ReadTableFromIndex(L, "luat_Test2", 3); ReadTableFromIndex(L, "luat_Test2", 4); lua_close(L); return 0; }