RFID Reader,optional with programmable logic controllers to streamline RFID

Question

RFID is used to automate the process of capturing batch production information for lot tracking. This eliminates the manual scanning typically required with a bar code solution through the use of container and location-based RFID tags interacting with readers on material-handling equipment.
RFID Reader(interrogator) is a vital RFID system component. A transmitter/receiver that reads the contents of RFID tags in the vicinity. Also called an "RFID interrogator." The maximum distance between the reader's antenna and the tag vary, depending on application.
In addition, readers can be fitted with an additional interface that converts the radio waves returned from the RFID tag into a form that can then be passed on to another system, like a computer or any programmable logic controller.
Generally speaking, RFID readers can be divided into two kinds by data collection features. One what is called smart RFID reader with advanced data collection features u2014 such as filtering of redundant tag data, is capable of controlling peripheral devices based on data read from the tag. Another what is called simple RFID reader with a lower price, is need to attach to a separate local server or a programmable logic controller for local decision making.
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Edited by: Jack Pan on Sep 26, 2008 3:16 PM

Answer 1

Problem is I wasn't compiling libnfc with my code. I've been able to use Visual Studio to compile a C file that uses libnfc (and libusb), but when I adapt the code to work with JNI, changing the main to:
JNIEXPORT jstring JNICALL Java_libnfc_Main_nativeTagID(JNIEnv *env, jobject obj) (for example)
I'm getting an error related to the libNFCNative.h. This file is supposed to aid in the creation of the dll file that the Java then uses to call functions from C.
The .h file has:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class libnfc_Main */
#ifndef _Included_libnfc_Main
#define _Included_libnfc_Main
#ifdef __cplusplus
extern "C" {
#endif
* Class:     libnfc_Main
* Method:    nativeTagID
* Signature: ()Ljava/lang/String;
JNIEXPORT jstring JNICALL Java_libnfc_Main_nativeTagID
 (JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endifThe error is as follows:
------ Build started: Project: nfc-list, Configuration: Debug Win32 ------
Linking...
  Creating library C:\Documents and Settings\Augusto\Desktop\libnfc-1.2.1-vs2005\vc-project\Debug\libNFCNative.lib and object C:\Documents and Settings\Augusto\Desktop\libnfc-1.2.1-vs2005\vc-project\Debug\libNFCNative.exp
MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
C:\Documents and Settings\Augusto\Desktop\libnfc-1.2.1-vs2005\vc-project\Debug\libNFCNative.dll : fatal error LNK1120: 1 unresolved externalsI've tried SWIG instead of JNI, but I'm having the exactly same error in Visual Studio. Anyone knows the reason for this error?