lua return string c++

Question

There is a function on Lua:

STRING getClassesList()

It returns string as it is to get on c++:

This does not work:

Const char * ClassesStr;
Lua_getglobal (L, "getClassesList");
Lua_pcall (L, 1, 1, 0);
ClassesStr = lua_tostring (L, 1);

stack: 'readQuikAgent' 'attempt to call a table value'

The function is designed to obtain a list of class codes sent from the server during the communication session. The class codes in the list are separated by a comma ",". At the end of the received line, the symbol "," is always appended.

Call format:

STRING getClassesList ()

Example:

List = getClassesList ()

As a result of the above line of code, the list variable contains a string of the form:

OPTEXP, USDRUB, PSOPT, PSFUT, SPBFUT

Then you didn't show enough code. See How to create a Minimal, Complete, and Verifiable example — Yu Hao
– Yu Hao, Commented May 25, 2017 at 6:02
STRING getClassesList() is not a valid Lua function signature. — Henri Menke
– Henri Menke, Commented May 25, 2017 at 6:09
Your specific lua_pcall(L, 1, 1, 0) call expects the function and one argument on the Lua stack. You only push the function. — siffiejoe
– siffiejoe, Commented May 25, 2017 at 6:40

mksteve · Accepted Answer · 2017-05-25 06:19:03Z

2

'attempt to call table value' means that the item at the top of the lua stack is a table not a function.

So the result of the getglobal was a table, and that can not be called.

answered May 25, 2017 at 6:19

mksteve

13.4k3 gold badges31 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mike · Accepted Answer · 2017-05-25 08:28:15Z

1

It works (thank you siffiejoe):

lua_pcall(L, 0, 1, 0);
ClassesStr = lua_tostring(L, -1);

answered May 25, 2017 at 8:28

Mike

216 bronze badges

Collectives™ on Stack Overflow

lua return string c++

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related