CheckOutputArgument

C function which checks the number of output arguments present in the calling Scilab function.

Calling Sequence

CheckOutputArgument(void* _pvCtx, int iMin, int iMax)

Arguments

:pvApiCtx Scilab environment pointer, pass in “pvApiCtx” provided by

api_scilab.h

: :iMin the minimum number of output arguments which must be present

in the calling Scilab function

: :iMax the maximum number of output arguments which must be present

in the calling Scilab function

:

Description

C function which checks the number of output arguments present in the calling Scilab function. You must include api_scilab.h to benefit from this function.

If the number of arguments is not between _iMin and _iMax, we quit the C interface ( return 0;) and an error is returned in the Scilab console.

Since CheckOutputArgument is doing a return 0; within the gateway function, it is important to call this function before any memory allocation in order to avoid any memory leak.

This function replaces the deprecated CheckLhs function

Examples

In this example, the C gateway function checks for a number of output arguments which must be between 2 and 3.

#include <api_scilab.h>

`int`_ sci_mychecklhs(char * fname)
{
  CheckOutputArgument(pvApiCtx, 2, 3);

  // Read input argument

  // Perform some operations

  // Return output argument
  return 0;
}

Now, some functions testing this interface:

[A,B] = mychecklhs(); // OK, 2 output arguments
[A,B,C] = mychecklhs(); // OK, 3 output arguments
[A] = mychecklhs(); // ERROR, 1 output argument
[A,B,C,D] = mychecklhs(); // ERROR, 4 output arguments

See Also

• CheckInputArgument C function which checks the number of input arguments present in the calling Scilab function.