String to Byte convertion related question. SMS related

Hi all
I need to ask more indepth question regarding string to bytes convertion. I need to have a constructed message format with a length of 161 bytes. Here's are the details:-
String message - 160 bytes allocation.
Message length - 1 byte allocation.
For converting the message string into byte I can use
byte b1[] = message.getBytes();
And i know to get the length of the message I can just use
message.length();
So my questions are :-
1) I need some help on how i'm supposed to convert the length message values and assign it into the message length variables which have 1 byte allocation.
2) Besides text, the message string can also be a hex value data. Hence it it possible that I can convert the hex data into byte and still maintain within the 160 bytes allocation ? Coz most of the times the hex data length will be > 160 but < 255 characters length. example :-
06050415810000024a3a7d35bd35bdb995e535bd41c9bd89b194040082986417614819817624e3105d85206605e09390391394417817817819817824e40e44e5104a04a04a05205105d85206605d8938c417614819817824e40e44e5105e05e05e06605e093903913944128128128148146800
Anyone can help ?
Thank You in Advanced

First of all. One character in a string can occupie
more than one byte in the destination array, so
String.length can be != bytes.length.
A byte in java is always signed, so the value will be
in the range -128 to +127.
KajHi Kaj,
Since you put it in that way, is there any tips u can give me on how I'm supposed to calculate the length of the string and set the value in byte ?
Or do I need to convert the string into bytes array first and then get the length ?
Thanks

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Hi Vishal,
I'll try to answer your questions as best I can.
1) It is definitely possible to preload data to the 32MB memory (per group) and start the acquisition after you have preloaded the memory. There are example programs on ni.com/support under Example Code for pattern generation and the 6534 that demonstrate which functions to use for this. Also, if your PC memory buffer is less than 32MB, it will automatically be loaded to the card. If you are in continuous mode however, you can choose to loop using the on-board memory or you can constantly be reading the PC memory buffer as you update it with your application environment.
2) Yes, your data will automatically be loaded into the card's onboard memory. It will however be transferred as quickly as possible to the DMA FIFO on the card and then transferred to the PC memory buffer through DMA. It is not going to wait until the whole onboard memory is filled before it transfers. It will transfer throughout the acquisition process.
3) Vishal, searching the example programs will give you many of the details of programming this type of application. I don't know you application software so I can't give you the exact functions but it is easiest to look at the examples on the net (or the shipping examples with your software). Now if you are acquiring 512 bytes of data, you will start to fill your onboard memory and at the same time, data will be sent to the DMA FIFO. When the FIFO is ready to send data to the PC memory buffer, it will (the exact algorithm is dependent on many things regarding how large the DMA packet is etc.).
4) If I understand you correctly, you want to know if you waste the other 6 bits if you only need to acquire on 10 lines. The answer to this is Yes. Although you are only acquiring 10 bits, it is acquired as a complete word (16bits) and packed and sent using DMA. You application software (NI-DAQ driver) will filter out the last 6 bits of non-data.
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Ron

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Both methods have been around since Java 1.1.
It's an extremely important skill to learn to read the API and become familiar with the tools you will use to program Java. Java has an extensive set of online documentation that you can even download for your convenience. These "javadocs" are indexed and categorized so you can quickly look up any class or method. Take the time to consult this resource whenever you have a question - you'll find they typically contain very detailed descriptions and possibly some code examples.
Java� API Specifications
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~

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Message was edited by: Infinite Lupe

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Message was edited by:
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