Name

Get child item (Scilab gateway) — How to get the address of a list child.

Calling Sequence

SciErr getListItemAddress(void* _pvCtx, int* _piAddress, int _iItemNum, int** _piItemAddress)

Parameters

_pvCtx

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

_piAddress

Address of the list.

_iItemNum

Item number.

_piItemAddress

Return address of the item.

SciErr

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

Description

This help describes how to get the address of a list child.

Gateway Source

             
int get_list_info(int* _piAddress);
void insert_indent(void);

static int iLocalTab = 0;

int common_list(char *fname,unsigned long fname_len)
{
    SciErr sciErr;
    int *piAddr     = NULL;

    CheckRhs(1,1);

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

    get_list_info(piAddr);

    LhsVar(1) = 0;
    return 0;
}

int get_list_info(int* _piAddress)
{
    SciErr sciErr;
    int i       = 0;
    int iRet    = 0;
    int iItem   = 0;

    //get list item number, failed if variable is not a kind of list
    sciErr = getListItemNumber(pvApiCtx, _piAddress, &iItem);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        sciprint("This variable is not a list");
        return 0;
    }

    sciprint("List (%d items) -> address : 0x%08X) : \n", iItem, _piAddress);
    for(i = 0 ; i < iItem ; i++)
    {
        int iType           = 0;
        int* piAddrChild    = NULL;
        sciErr = getListItemAddress(pvApiCtx, _piAddress, i + 1, &piAddrChild);
        if(sciErr.iErr)
        {
            printError(&sciErr, 0);
            return 0;
        }

        sciErr = getVarType(pvApiCtx, piAddrChild, &iType);
        if(sciErr.iErr)
        {
            printError(&sciErr, 0);
            return 0;
        }

        if(iType == sci_list || iType == sci_tlist || iType == sci_mlist)
        {
            insert_indent();
            sciprint("Child %d -> ", i + 1);
            iLocalTab++;
            iRet = get_list_info(piAddrChild);
            iLocalTab--;
            if(iRet)
            {
                return 1;
            }
        }
        else
        {
            insert_indent();
            sciprint("Child %d -> address : 0x%08X\n", i + 1, piAddrChild);
        }
    }
    return 0;
}

void insert_indent(void)
{
    int i = 0;
    for(i = 0 ; i < iLocalTab ; i++)
    {
        sciprint("\t");
    }
}

Scilab test script

 
l1 = [1,2*%i,3;%i,2,3*%i];
l2 = ["may","the";"puffin","be";"with","you"];
l3 = int8([1,2,3]);
l5 = list(l1,l2,l3);
l4 = list(l5, list(l5,l5));
l6 = uint16([1000,2000,3000]);
l = list(l1,l2,l3,l6,l4,l5);
common_list(l)