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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) 2009 - DIGITEO - Sylvestre LEDRU
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ns5="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:id="StringManagement_callscilab" xml:lang="en">
<refnamediv>
<refname>String management</refname>
<refpurpose>How to manage Scilab's String read and write process using
call_scilab and api_scilab
</refpurpose>
</refnamediv>
<refsection>
<title>Description</title>
<para>This help describes how strings and matrix of strings can be handle
through the <link linkend="call_scilab">Call Scilab API</link> and <link linkend="api_scilab">api Scilab</link>.
</para>
<para>There are several functions which can be used to read / write from
the memory of Scilab. These functions are described in dedicated
pages.
</para>
<para>
<note>
Note: Access to variables is done through <link linkend="api_scilab">api Scilab</link> (named variable).
</note>
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
// This example shows how to write a Scilab string in Scilab engine
// It is the equivalent to A="my Message"; in Scilab interpretor
// See: modules/call_scilab/examples/basicExamples/readwritestring.c
// StartScilab
int row = 1, col = 1; /* Size of the matrix */
/* Declare the string */
char **myMatrixOfString = (char**)malloc(sizeof(char*) * row * col);
myMatrixOfString[0]="my Message";
char variableName[] = "A";
SciErr sciErr;
/* Write it into Scilab's memory */
sciErr = createNamedMatrixOfString(pvApiCtx, variableName, row, col, myMatrixOfString);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}
/*
* Prior to Scilab 5.2
* C2F(cwritechain)(variableName, &sizeOfMyString , myString, strlen(variableName), sizeOfMyString);
*/
printf("Display from Scilab of A:\n");
SendScilabJob("disp(A);"); /* Display A */
]]></programlisting>
<programlisting role="example"><![CDATA[
/* Load the previously set variable A */
// See: modules/call_scilab/examples/basicExamples/readwritestring.c
char variableToBeRetrieved[]="A";
int iRows = 0;
int iCols = 0;
int i,j;
int* piAddr = NULL;
int* piLen = NULL;
char** pstData = NULL;
SciErr sciErr;
//first call to retrieve dimensions
sciErr = readNamedMatrixOfString(pvApiCtx,variableToBeRetrieved,&iRows, &iCols, NULL, NULL);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}
piLen = (int*)malloc(sizeof(int) * iRows * iCols);
//second call to retrieve length of each string
sciErr = readNamedMatrixOfString(pvApiCtx,variableToBeRetrieved, &iRows, &iCols, piLen, NULL);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}
pstData = (char**)malloc(sizeof(char*) * iRows * iCols);
for(i = 0 ; i < iRows * iCols ; i++)
{
pstData[i] = (char*)malloc(sizeof(char) * (piLen[i] + 1));//+ 1 for null termination
}
//third call to retrieve data
sciErr = readNamedMatrixOfString(pvApiCtx, variableToBeRetrieved, &iRows, &iCols, piLen, pstData);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}
printf("\n");
printf("Load and display of A:\n");
for(j = 0 ; j < iCols ; j++)
{
for(i = 0 ; i < iRows ; i++)
{
/* Display the formated matrix with same scilab indice */
printf("[%d,%d] = %s\n",j+1,i+1,pstData[j* iRows + i]);
}
}
printf("\n");
free(piLen);
for(i = 0 ; i < iRows * iCols ; i++)
{
free(pstData[i]);
}
free(pstData);
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="call_scilab">Call_Scilab</link>
</member>
<member>
<link linkend="api_scilab">api Scilab</link>
</member>
<member>
<link linkend="SendScilabJob">SendScilabJob</link>
</member>
<member>
<link linkend="StartScilab">StartScilab</link>
</member>
<member>
<link linkend="BooleanManagement_callscilab">Call_Scilab: Boolean Management</link>
</member>
<member>
<link linkend="DoubleManagement_callscilab">Call_Scilab: Double Management</link>
</member>
<member>
<link linkend="boolean_reading_API">API_Scilab: Boolean Reading</link>
</member>
<member>
<link linkend="boolean_writing_API">API_Scilab: Boolean Writing</link>
</member>
<member>
<link linkend="Double_management_reading_API">API_Scilab: Double Reading</link>
</member>
<member>
<link linkend="Double_management_writing_API">API_Scilab: Double Writing</link>
</member>
<member>
<link linkend="ComplexManagement_callscilab">Complex Management</link>
</member>
</simplelist>
</refsection>
</refentry>
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