com_recv.c

MatLab图像传感器网络仿真平台WiSNAP

/*******************************************************************************
 * Receive a response packet from an RS-232 communications object.             *
 * Syntax: [Packet, Status] = Com_Recv(Handle, Length)                         *
 *                                                                             *
 *    Input Parameters:                                                        *
 *    ================                                                         *
 *                                                                             *
 *       Handle ------> I/O object handle (positive integer).                  *
 *       Length ------> Packet length to receive (positive integer).           *
 *                                                                             *
 *    Output Parameters:                                                       *
 *    =================                                                        *
 *                                                                             *
 *       Packet ------> Response packet (string).         	                   *
 *       Status ------> Success status (-1 = error, +1 = success).             *
 *                                                                             *
 *    See also Com_Open(), Com_Close(), Com_Send().                            *
 *                                                                             *
 * Compile: mex -v com_recv.c cmApiCom.c                                       *
 * Version: 01-22-2005                                                         *
 *                                                                             *
 * (C) 2004 Stephan Hengstler, Stanford Wireless Sensor Networks Lab           *
 *******************************************************************************/


#include <stdio.h>
#include <windows.h>
#include "mex.h"
#include "cmApiCom.h"

void mexFunction(int nlhs, mxArray *plhs[],int nrhs, const mxArray *prhs[])
{
	char 			*packet;
	double		*result1;
	HANDLE 		handle;
	int			dims[2], i, length, status;
	mxChar 		*result0;

	/* get the value(s) of the input variable(s) */
	handle 		= (int *) (int) mxGetScalar(prhs[0]);
	length		= (int) mxGetScalar(prhs[1]);

	/* call the respective subroutine(s) */
	packet 		= (char *) mxCalloc(length+1, sizeof(char));
	status		= cmComRecv(handle, packet, length, &length);

	/* set the value(s) of the output variable(s) */
	dims[0]		= 1;
	dims[1]		= length;
	plhs[0] 		= mxCreateCharArray(2, dims);
	result0		= (mxChar *) mxGetData(plhs[0]);
	for (i = 0; i < length; i++)
		result0[i]	= packet[i];
	plhs[1] 		= mxCreateDoubleMatrix(1, 1, mxREAL);
   result1		= mxGetPr(plhs[1]);
	*result1		= status;

   /* show debug information */
	if (nrhs == 3)
	{
		printf("Debug Information\n");
		printf("handle   	= %d\n", handle);
		printf("length   	= %d\n", length);
		printf("packet		= %s\n", packet);
		printf("status		= %d\n", status);
	}

	/* clean exit */
	return;
}