Pointer reading (Scilab gateway)
How to read pointer in a gateway.
Syntax
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
#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; 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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