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        luaL_dostring 在堆栈上什么都不放?

        时间:2023-09-26

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                • 本文介绍了luaL_dostring 在堆栈上什么都不放?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我正在尝试学习 Lua 与 C++ 接口的基础知识,但遇到了一个问题.我想调用一个返回字符串的函数,然后在 C++ 端处理这个字符串,但是 luaL_dostring 似乎没有在 Lua 堆栈上放任何东西.

                  I'm trying to learn the basics of interfacing Lua with C++, but I've run into a problem. I want to call a function that returns a string, and then work with the string on the C++ side, but luaL_dostring seems to put nothing on the Lua stack.

                  即使是一个简单的测试似乎也不能正常工作:

                  Even a simple test doesn't seem to work properly:

                  lua_State* lua = lua_open();
                  luaL_openlibs(lua);
                  
                  //Test dostring.
                  luaL_dostring(lua, "return 'derp'");
                  
                  int top = lua_gettop(lua);
                  cout << "stack top is " <<top << endl;
                  
                  //Next, test pushstring.
                  lua_pushstring(lua, "derp");
                  
                  top = lua_gettop(lua);
                  cout << "stack top is " << top << endl;
                  

                  输出:

                  stack top is 0
                  stack top is 1
                  

                  有什么想法吗?

                  推荐答案

                  啊哈,发现问题了.根据 this page,在 Lua 5.1 中 luaL_dostring 忽略返回.我的代码可能适用于 Lua 5.2.

                  Aha, found the problem. According to this page, in Lua 5.1 luaL_dostring ignores returns. The code I had would probably work in Lua 5.2.

                  要更改功能,您应该使用:

                  To alter the functionality, you should use:

                  #undef luaL_dostring
                  #define luaL_dostring(L,s)  
                      (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))
                  

                  这篇关于luaL_dostring 在堆栈上什么都不放?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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