更新时间:2023-02-04 08:48:13
if(!luaL_loadstring(lua, code.c_str())){
if (lua_pcall(lua, 0, 0, 0)){
const char* error = lua_tostring(lua, -1);
lua_pop(lua, 1);
}
}
此代码将字符串加载到匿名函数中使用 luaL_loadstring()
,将它放在堆栈上,然后使用 lua_pcall(lua,0,0,0)
执行函数。
This code loads string into a anonymous function using luaL_loadstring()
, puts it on the stack and then executes the function using lua_pcall(lua, 0, 0, 0)
.
lua_pushstring(lua, "100");
lua_setglobal(lua, "gvar");
if (lua_pcall(lua, 0, 0, 0)){
const char* error = lua_tostring(lua, -1); // returns "attempt to call a nil value"
lua_pop(lua, 1);
}
这段代码将字符串推入堆栈,然后设置全局变量 gvar
。在调用 lua_setglobal()
后,堆栈上应该没有任何东西。
This piece of code pushes string onto the stack then sets global variable gvar
. There should be nothing on the stack after call to lua_setglobal()
. The var is already there.
现在,您尝试使用 lua_pcall $ c>调用位于堆栈顶部的函数$ c>,但是栈是空的 - 这就是为什么你得到
尝试调用一个nil值
消息。
Now after that you try to call a function which is at the top of the stack with lua_pcall
, but the stack is empty - that's why you get attempt to call a nil value
message.