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How can I call Lua scripts from a C program?

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3

I have 2 lua scripts. One require another one. So how can I call it from a C program?

For example:

main.lua

local foo = require "foo"

function main()
 foo.bar()
end

main()

foo.lua

function bar( )
 io.write("hello, world!n")
end

And this is my C program:

#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <stdio.h>
#include <stdlib.h>

int main() 
 int status, result;
 lua_State *L;
 L = luaL_newstate();
 luaL_openlibs(L);

 status = luaL_loadfile(L, "main.lua");
 if (status) 
 fprintf(stderr, "Couldn't load file: %sn", lua_tostring(L, -1));
 exit(1);
 

 result = lua_pcall(L, 0, LUA_MULTRET, 0);
 if (result) 
 fprintf(stderr, "Failed to run script: %sn", lua_tostring(L, -1));
 exit(1);
 

 lua_close(L);

 return 0;

It throws a runtime error:

Failed to run script: main.lua:130: module 'foo' not found: no field
package.preload['foo'] no file '/usr/local/share/lua/5.3/foo.lua' no
file '/usr/local/share/lua/5.3/foo/init.lua' no file
'/usr/local/lib/lua/5.3/foo.lua' no file
'/usr/local/lib/lua/5.3/foo/init.lua' no file './foo.lua' no file
'./foo/init.lua' no file '/usr/local/lib/lua/5.3/foo.so' no file
'/usr/local/lib/lua/5.3/loadall.so' no file './foo.so'

I think it is because foo.lua is not loaded into the lua virtual machine, but I can't find API like load files or do files. So what should I do?

c lua

share|improve this question

asked Mar 8 at 11:17

0x119010x11901

798

add a comment | 

3

I have 2 lua scripts. One require another one. So how can I call it from a C program?

For example:

main.lua

local foo = require "foo"

function main()
 foo.bar()
end

main()

foo.lua

function bar( )
 io.write("hello, world!n")
end

And this is my C program:

#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <stdio.h>
#include <stdlib.h>

int main() 
 int status, result;
 lua_State *L;
 L = luaL_newstate();
 luaL_openlibs(L);

 status = luaL_loadfile(L, "main.lua");
 if (status) 
 fprintf(stderr, "Couldn't load file: %sn", lua_tostring(L, -1));
 exit(1);
 

 result = lua_pcall(L, 0, LUA_MULTRET, 0);
 if (result) 
 fprintf(stderr, "Failed to run script: %sn", lua_tostring(L, -1));
 exit(1);
 

 lua_close(L);

 return 0;

It throws a runtime error:

Failed to run script: main.lua:130: module 'foo' not found: no field
package.preload['foo'] no file '/usr/local/share/lua/5.3/foo.lua' no
file '/usr/local/share/lua/5.3/foo/init.lua' no file
'/usr/local/lib/lua/5.3/foo.lua' no file
'/usr/local/lib/lua/5.3/foo/init.lua' no file './foo.lua' no file
'./foo/init.lua' no file '/usr/local/lib/lua/5.3/foo.so' no file
'/usr/local/lib/lua/5.3/loadall.so' no file './foo.so'

I think it is because foo.lua is not loaded into the lua virtual machine, but I can't find API like load files or do files. So what should I do?

c lua

share|improve this question

asked Mar 8 at 11:17

0x119010x11901

798

add a comment | 

I have 2 lua scripts. One require another one. So how can I call it from a C program?

For example:

main.lua

local foo = require "foo"

function main()
 foo.bar()
end

main()

foo.lua

function bar( )
 io.write("hello, world!n")
end

And this is my C program:

#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <stdio.h>
#include <stdlib.h>

int main() 
 int status, result;
 lua_State *L;
 L = luaL_newstate();
 luaL_openlibs(L);

 status = luaL_loadfile(L, "main.lua");
 if (status) 
 fprintf(stderr, "Couldn't load file: %sn", lua_tostring(L, -1));
 exit(1);
 

 result = lua_pcall(L, 0, LUA_MULTRET, 0);
 if (result) 
 fprintf(stderr, "Failed to run script: %sn", lua_tostring(L, -1));
 exit(1);
 

 lua_close(L);

 return 0;

It throws a runtime error:

Failed to run script: main.lua:130: module 'foo' not found: no field
package.preload['foo'] no file '/usr/local/share/lua/5.3/foo.lua' no
file '/usr/local/share/lua/5.3/foo/init.lua' no file
'/usr/local/lib/lua/5.3/foo.lua' no file
'/usr/local/lib/lua/5.3/foo/init.lua' no file './foo.lua' no file
'./foo/init.lua' no file '/usr/local/lib/lua/5.3/foo.so' no file
'/usr/local/lib/lua/5.3/loadall.so' no file './foo.so'

I think it is because foo.lua is not loaded into the lua virtual machine, but I can't find API like load files or do files. So what should I do?

c lua

share|improve this question

asked Mar 8 at 11:17

0x119010x11901

798

local foo = require "foo"

function main()
 foo.bar()
end

main()

function bar( )
 io.write("hello, world!n")
end

#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
#include <stdio.h>
#include <stdlib.h>

int main() 
 int status, result;
 lua_State *L;
 L = luaL_newstate();
 luaL_openlibs(L);

 status = luaL_loadfile(L, "main.lua");
 if (status) 
 fprintf(stderr, "Couldn't load file: %sn", lua_tostring(L, -1));
 exit(1);
 

 result = lua_pcall(L, 0, LUA_MULTRET, 0);
 if (result) 
 fprintf(stderr, "Failed to run script: %sn", lua_tostring(L, -1));
 exit(1);
 

 lua_close(L);

 return 0;

share|improve this question

asked Mar 8 at 11:17

0x119010x11901

798

share|improve this question

asked Mar 8 at 11:17

0x119010x11901

798

asked Mar 8 at 11:17

0x119010x11901

798

asked Mar 8 at 11:17

0x119010x11901

798

1 Answer
1

active

oldest

votes

2

It works fine, your foo.lua is wrong, change it to:

local foo = 

function foo.bar()
 io.write("Hello World!n")
end

return foo

and it works:

$ ls
foo.lua luabr.c main.lua
BladeMight ~/lua/tests/605
$ gcc luabr.c -llua && ./a
Hello World!

** luabr.c is your C program code.

share|improve this answer

edited Mar 8 at 11:38

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much！
  
  – 0x11901
  Mar 8 at 13:35
  

  
  
  
  

add a comment | 

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2

It works fine, your foo.lua is wrong, change it to:

local foo = 

function foo.bar()
 io.write("Hello World!n")
end

return foo

and it works:

$ ls
foo.lua luabr.c main.lua
BladeMight ~/lua/tests/605
$ gcc luabr.c -llua && ./a
Hello World!

** luabr.c is your C program code.

share|improve this answer

edited Mar 8 at 11:38

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much！
  
  – 0x11901
  Mar 8 at 13:35
  

  
  
  
  

add a comment | 

2

It works fine, your foo.lua is wrong, change it to:

local foo = 

function foo.bar()
 io.write("Hello World!n")
end

return foo

and it works:

$ ls
foo.lua luabr.c main.lua
BladeMight ~/lua/tests/605
$ gcc luabr.c -llua && ./a
Hello World!

** luabr.c is your C program code.

share|improve this answer

edited Mar 8 at 11:38

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you very much！
  
  – 0x11901
  Mar 8 at 13:35
  

  
  
  
  

add a comment | 

It works fine, your foo.lua is wrong, change it to:

local foo = 

function foo.bar()
 io.write("Hello World!n")
end

return foo

and it works:

$ ls
foo.lua luabr.c main.lua
BladeMight ~/lua/tests/605
$ gcc luabr.c -llua && ./a
Hello World!

** luabr.c is your C program code.

share|improve this answer

edited Mar 8 at 11:38

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

local foo = 

function foo.bar()
 io.write("Hello World!n")
end

return foo

$ ls
foo.lua luabr.c main.lua
BladeMight ~/lua/tests/605
$ gcc luabr.c -llua && ./a
Hello World!

share|improve this answer

edited Mar 8 at 11:38

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427

answered Mar 8 at 11:32

BladeMightBladeMight

1,5211427