How many is the transmit's feasibility?

There is a commercial ActiveX group controls for "GPS" functions with VC/VB programming, Now we know nothing besides "User Guide" of the software, we will transmit these codes and by JAVA language programming if this project is accepted, we are considering the feasibility of the transform.

All exports, How many is the transmit's feasibility?
GempinAsked:
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gandalf94305Connect With a Mentor Commented:
There are two approaches:

- Wrap the ActiveX control functions in a JNI (Java Native Interface) interface and define the Java binding this way. You will have a low risk in your project definition phase because you don't need any source code of the ActiveX stuff in advance. Just transform the ActiveX control functions into JNI methods.

- Re-implementing the ActiveX control will involve using something like jcomm (Java serial interface communication package) and simple parsing of the incoming GPS signals. This is not very hard to do, so you should also be fine. Basically, you get a code every time interval, you parse it and store it somewhere (one thread). The API of your GPS classes would then provide access to the last GPS code received. You will have to implement more and therefore the risk of this project is higher than the first alternative. On the other hand, using JComm, you will become very portable.

First solution: on the order of max. 10 days to design, implement and test. Second solution: on the order of max. 25 days to design, implement and test (testing will be the tricky part).

Your decision.

Cheers,
--gandalf.
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heyhey_Commented:
will you have access to the sources ?
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GempinAuthor Commented:
thanx for your attention. we are considering the transmit's feasibility, it's impossible to access the source codes before we would promise and accepted the project. we may not access the codes, they are the confidential to this corporation. we only can read this software(ActiveX control) user guide and interfaces, we will reply them to do or not after we judged the transmit's feasibility. so the key of the question should be how difficult a complicated ActiveX control of VC/VB transmit into JAVA language? welcome your comment again.
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GempinAuthor Commented:
Another, I'm a C/C++ programmar and know nothing to JAVA, can you introduce some JAVA character of component model technology?
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heyhey_Commented:
1. what are ActiveX control features ?
1. what is the purpose of rewriting the code in Java ?
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GempinAuthor Commented:
1. the ActiveX controls is a components group of "GPS"(Global Positioning Systems) features, it can position and navigate road, direction and routes information in a guide board.
2. you know, JAVA have multi-platform feature, so they hope the control can be apply to multi-device as mobile, PDA, Car-navi...
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GempinAuthor Commented:
1. the ActiveX controls is a components group of "GPS"(Global Positioning Systems) features, it can position and navigate road, direction and routes information in a guide board.
2. you know, JAVA have multi-platform feature, so they hope the control can be apply to multi-device as mobile, PDA, Car-navi...
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heyhey_Commented:
GPS is hardware receiver. what exactly ActiveX is supposed to do, i.e.
- receive data from GPS (using RS232 or whatever protocolo)
- display maps and current coordinates
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GempinAuthor Commented:
1. the ActiveX controls is a components group of "GPS"(Global Positioning Systems) features, it can position and navigate road, direction and routes information in a guide board.
2. you know, JAVA have multi-platform feature, so they hope the control can be apply to multi-device as mobile, PDA, Car-navi...
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GempinAuthor Commented:
yeah, they have server group receive data from GPS, it can offer Navigation service for mobile, car... clients; client also can fill data from server with memory card, then the card can be use under windows ce platform...
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heyhey_Commented:
Java is platform independent so you cannot easily access system resources - you have to write native code for each OS specific issue.

make a list of the features that are "platform independent" and which are not.
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GempinAuthor Commented:
by the way, client guide board will also display maps and current coordinates and other infomation.
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CEHJCommented:
Java is platform independent but ActiveX is essentially a Windows technology. Using Java could give you a double impedance mismatch - between Java and ActiveX and Java and the hardware environment. You also have the problem of Java runtime size for any hardware platform you need to support. I'd stick to C/C++!
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CEHJCommented:
Of course, as heyhey says, if you had the source, things might look a little different...
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GempinAuthor Commented:
by the way, client guide board will also display maps and current coordinates and other infomation.
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GempinAuthor Commented:
then can i implement those functions with "close-relation" JAVA "CLASS" than components technology?
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GempinAuthor Commented:
Thanks gandalf94305, heyhey_ and CEHJ for your comments, they are so valuable to me.
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