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| author | Lorry Tar Creator <lorry-tar-importer@baserock.org> | 2009-08-18 20:56:02 +0000 |
|---|---|---|
| committer | Lorry <lorry@roadtrain.codethink.co.uk> | 2012-09-25 16:59:08 +0000 |
| commit | 9f8a09ed743cedd9547bf0661d518647966ab114 (patch) | |
| tree | 9c7803d3b27a8ec22e91792ac7f7932efa128b20 /Examples/lua/embed/embed.c | |
| download | swig-tarball-master.tar.gz | |
Imported from /srv/lorry/lorry-area/swig-tarball/swig-1.3.40.tar.gz.HEADswig-1.3.40master
Diffstat (limited to 'Examples/lua/embed/embed.c')
| -rw-r--r-- | Examples/lua/embed/embed.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Examples/lua/embed/embed.c b/Examples/lua/embed/embed.c new file mode 100644 index 0000000..55ea099 --- /dev/null +++ b/Examples/lua/embed/embed.c @@ -0,0 +1,85 @@ +/* embed.c a simple test for an embeded interpreter
+
+The idea is that we wrapper a few simple function (example.c)
+and write our own app to call it.
+
+What it will do is load the wrappered lib, load runme.lua and then call some functions.
+To make life easier, all the printf's have either [C] or [Lua] at the start
+so you can see where they are coming from.
+
+We will be using the luaL_dostring()/lua_dostring() function to call into lua
+
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <lua.h>
+#include <lauxlib.h>
+#include <lualib.h>
+
+/* the SWIG wrappered library */
+extern int luaopen_example(lua_State*L);
+
+/* a really simple way of calling lua from C
+ just give it a lua state & a string to execute
+Unfortunately lua keeps changing its API's.
+In lua 5.0.X its lua_dostring()
+In lua 5.1.X its luaL_dostring()
+so we have a few extra compiles
+*/
+int dostring(lua_State *L, char* str) {
+ int ok;
+#if (defined(LUA_VERSION_NUM) && (LUA_VERSION_NUM>=501))
+
+ ok=luaL_dostring(L,str); /* looks like this is lua 5.1.X or later, good */
+#else
+
+ ok=lua_dostring(L,str); /* might be lua 5.0.x, using lua_dostring */
+#endif
+
+ if (ok!=0)
+ printf("[C] ERROR in dostring: %s\n",lua_tostring(L,-1));
+ return ok;
+}
+
+
+int main(int argc,char* argv[]) {
+ lua_State *L;
+ int ok;
+ printf("[C] Welcome to the simple embedded lua example\n");
+ printf("[C] We are in C\n");
+ printf("[C] opening a lua state & loading the libraries\n");
+ L=lua_open();
+ luaopen_base(L);
+ luaopen_string(L);
+ luaopen_math(L);
+ printf("[C] now loading the SWIG wrappered library\n");
+ luaopen_example(L);
+ printf("[C] all looks ok\n");
+ printf("\n");
+ printf("[C] lets load the file 'runme.lua'\n");
+ printf("[C] any lua code in this file will be executed\n");
+ if (luaL_loadfile(L, "runme.lua") || lua_pcall(L, 0, 0, 0)) {
+ printf("[C] ERROR: cannot run lua file: %s",lua_tostring(L, -1));
+ exit(3);
+ }
+ printf("[C] We are now back in C, all looks ok\n");
+ printf("\n");
+ printf("[C] lets call the function 'do_tests()'\n");
+ ok=dostring(L,"do_tests()");
+ printf("[C] We are back in C, the dostring() function returned %d\n",ok);
+ printf("\n");
+ printf("[C] Lets call lua again, but create an error\n");
+ ok=dostring(L,"no_such_function()");
+ printf("[C] We are back in C, the dostring() function returned %d\n",ok);
+ printf("[C] it should also have returned 1 and printed an error message\n");
+ printf("\n");
+ printf("[C] Lets call lua again, calling the greeting function\n");
+ ok=dostring(L,"call_greeting()");
+ printf("[C] This was C=>Lua=>C (getting a bit complex)\n");
+ printf("\n");
+ printf("[C] all finished, closing the lua state\n");
+ lua_close(L);
+ return 0;
+}
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