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Manuel 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) >>
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with contributors 		Last updated:
Wed Jan 26 16:24:18 CET 2011