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- Subject: Replaced print function return stack getting emptied
- From: Bruce Wheaton <bruce@...>
- Date: Sun, 6 May 2012 09:52:35 -0700
Hello, (first post, sorry if I miss some list etiquette details)
I have made a replacement print function in C++ to put what the user prints onto the stack so I can pull it off and send it out to the user on a socket.
This is my print function:
static int return_print (lua_State* L)
int nargs = lua_gettop (L);
int returns = 0;
lua_getglobal (L, "tostring");
for (int i = 1; i <= nargs; i++)
const char *s;
lua_pushvalue (L, nargs + 1); /* function to be called */
lua_pushvalue (L, i); /* value to print */
lua_call (L, 1, 1);
// don't pop - we're leaving them on the stack
It gets called and works fine - leave the stack with the original stack, plus a function and my new results, and returns the number of results. It works with 1 or more results.
Then I call some user code with:
int err = luaL_loadstring (luaVM, inCmd.toUTF8()) || lua_pcall (luaVM, 0, LUA_MULTRET, 0); // 0 args, any results
String problem = String::fromUTF8 (lua_tostring (luaVM, -1));
lua_pop (luaVM, 1); // pop error message from the stack
response = "MeshScript error: " + problem;
int nargs = lua_gettop (luaVM);
nargs is always blank.
If I use the system print, it prints to the console, and my version gets called - that seems ok.
The problem seems to occur after running my function. Part way through the post C function call my stack gets wiped.
Am I missing something?