Scilab Website | Contribute with GitLab | Mailing list archives | ATOMS toolboxes
Scilab Online Help
5.3.1 - Français

Change language to:
English - 日本語 - Português

Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
However, this page did not exist in the previous stable version.

Aide Scilab >> API Scilab > Low level functions > Pointer reading (Scilab gateway)

Pointer reading (Scilab gateway)

How to read pointer in a gateway.

Calling Sequence

Input argument profile:

SciErr getPointer(void* _pvCtx, int* _piAddress, void** _pvPtr)

Named variable profile:

SciErr readNamedPointer(void* _pvCtx, const char* _pstName, void** _pvPtr)

Arguments

_pvCtx

Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h

_piAddress

Address of the Scilab variable.

_pvPtr

Return address of pointer.

SciErr

Error structure where is stored errors messages history and first error number.

Description

This help describes how pointer can be handled through the Scilab API.

Gateway Source

int read_pointer(char *fname,unsigned long fname_len)
{
	SciErr sciErr;
	CheckRhs(0,1);
	CheckLhs(1,1);

	if(Rhs == 0)
	{//create mode
		double* pdblData	= (double*)malloc(sizeof(double) * 2 * 2);
		pdblData[0]			= 1;
		pdblData[1]			= 3;
		pdblData[2]			= 2;
		pdblData[3]			= 4;

		sciErr = createPointer(pvApiCtx, Rhs + 1, (void*)pdblData);
	}
	else if(Rhs == 1)
	{//read mode
		int iType			= 0;
		int* piAddr			= NULL;
		void* pvPtr			= NULL;
		double* pdblData	= NULL;

		sciErr = getVarAddressFromPosition(pvApiCtx, 1, &piAddr);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		sciErr = getPointer(pvApiCtx, piAddr, &pvPtr);
		if(sciErr.iErr)
		{
			printError(&sciErr, 0);
			return 0;
		}

		pdblData = (double*)pvPtr;

		sciErr = createMatrixOfDouble(pvApiCtx, Rhs + 1, 2, 2, pdblData);
	}
	else
	{
		return 0;
	}

	if(sciErr.iErr)
	{
		printError(&sciErr, 0);
		return 0;
	}

	LhsVar(1) = Rhs + 1;
	return 0;
}

Scilab test script

b_ref = [1,2;3,4];
a = read_pointer();
b = read_pointer(a);
if or(b <> b_ref) then error("failed"), end
<< Integer writing (Scilab gateway) Low level functions Pointer writing (Scilab gateway) >>
Copyright (c) 2022-2024 (Dassault Systèmes)
Copyright (c) 2017-2022 (ESI Group)
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors 		Last updated:
Thu Mar 03 11:00:16 CET 2011