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This won't work 100%. Namely, it won't do boolean values (since they can't be coerced), and also, you modify the stack if there's a number that's converted to a string.

// David Morris-Oliveros
// Camera & Lua Coder

Karsten Schulz wrote:
is that what u like ?
int CLuaCallBacks::_print(lua_State *lua)//DirectCallFunction
lua_pushlightuserdata(lua, pid);
lua_gettable(lua, LUA_REGISTRYINDEX);
CLuaScript *pThis = (CLuaScript *)lua_touserdata(lua, -1);

if(!pThis) return 0;
int n = lua_gettop(lua); //number of arguments
for (int i = 1; i < n; i++)
pThis->Print("%s\r\n",lua_tostring(lua, i));
return 0;

    ----- Original Message -----
    *From:* joe rossi <>
    *Sent:* Saturday, March 11, 2006 11:04 PM
    *Subject:* Lua 5.1f: How to dump stack contents from C?

    I'm using Lua 5.1 final, and I need a stack dump function.  What I
    came up with doesn't seem to print accurately, or anything at
    all.  Does anyone know how I might change this to make it work ?
    It's very difficult for me to work if I cannot see my Lua error

    static void stackDump (lua_State *L) {
          int i=lua_gettop(L);
          printf(" ----------------  Stack Dump ----------------" );
          while(  i   ) {
            int t = lua_type(L, i);
            switch (t) {
              case LUA_TSTRING:
                printf("%d:`%s'", i, lua_tostring(L, i));
              case LUA_TBOOLEAN:
                printf("%d: %s",i,lua_toboolean(L, i) ? "true" : "false");
              case LUA_TNUMBER:
                printf("%d: %g",  i, lua_tonumber(L, i));
             default: printf("%d: %s", i, lua_typename(L, t)); break;
         printf("--------------- Stack Dump Finished ---------------" );

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