Pointer writing (Scilab gateway)
How to write pointer in a gateway.
Create from existing data.
Syntax
Input argument profile:
SciErr createPointer(void* _pvCtx, int _iVar, const void* _pvPtr)
Named variable profile:
SciErr createNamedPointer(void* _pvCtx, const char* _pstName, void const** _pvPtr)
Arguments
- _pvCtx
Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h
- _iVar
Position in the Scilab memory where you want to put the variable
- _pstName
Name of the variable for "named" functions.
- _pvPtr
Address of pointer.
- SciErr
Error structure where is stored errors messages history and first error number.
Write directly in Scilab memory.
Syntax
SciErr allocPointer(void* _pvCtx, int _iVar, 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.
Two types of functions can be used to write in the memory of Scilab.
Gateway Source
#include "api_scilab.h" int read_pointer(char *fname,void* pvApiCtx) { SciErr sciErr; CheckInputArgument(pvApiCtx, 0, 1); CheckOutputArgument(pvApiCtx, 0, 1); if(nbInputArgument(pvApiCtx) == 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, nbInputArgument(pvApiCtx) + 1, (void*)pdblData); } else if(nbInputArgument(pvApiCtx) == 1) {//read mode int iType = 0; int* piAddr = NULL; const 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, nbInputArgument(pvApiCtx) + 1, 2, 2, pdblData); } else { return 0; } if(sciErr.iErr) { printError(&sciErr, 0); return 0; } AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1; return 0; }
Scilab test script
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