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POtransferTo Java.nio fils with 00's when run through Matlab JVM?
 

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  1. POtransferTo Java.nio fils with 00's when run through Matlab JVM?
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    <p>Im using matlab jvm with Java.Nio to copy the body of a binary file to another file without the header.</p> <p>My code is:</p> <pre><code>fromfile = java.io.RandomAccessFile(ifile, 'rw'); fromchannel = fromfile.getChannel(); tofile = java.io.FileOutputStream(ofile); tochannel = tofile.getChannel(); tochannel.position(0); fromchannel.transferTo(n,fromfile.length()-n,tochannel); tochannel.close(); fromchannel.close(); fromfile.close(); tofile.close(); </code></pre> <p>and what i want is a hexidecimal start with 7F 7F (the start of my body after header) but what im getting is:</p> <pre><code>000004e0h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 000004f0h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000500h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000510h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000520h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000530h: 00 00 00 00 00 00 00 00 00 00 00 00 00 7F 7F 2F ; ............./ 00000540h: 07 00 07 14 00 4F 00 90 00 12 03 54 04 96 05 D8 ; .....O....T.–.Ø </code></pre> <p>Etc....Etc...</p> <p>Anyone know why its outputing like this?? I can't get it to write properly???</p> <p>EDIT 001.</p> <p>the matlab function im using is:</p> <pre><code>function TrimBinary(ifile,ofile,n) fromfile = java.io.RandomAccessFile(ifile, 'rw'); fromchannel = fromfile.getChannel(); tofile = java.io.FileOutputStream(ofile); tochannel = tofile.getChannel(); tochannel.position(0); fromchannel.transferTo(n,fromfile.length()-n,tochannel); tochannel.close(); fromchannel.close(); fromfile.close(); tofile.close(); end </code></pre> <p>My test input is:</p> <pre><code>00000000h: 05 FF 49 FF F4 FD 13 FF A5 FD A5 20 AC FD 55 FE ; .ÿIÿôý.ÿ¥ý¥ ¬ýUþ 00000010h: 67 FE C7 FF BE FD 75 FE CF FE 28 20 A1 FD 3F FE ; gþÇÿ¾ýuþÏþ( ¡ý?þ 00000020h: 1C FD 4B 20 D0 FD 49 FF 62 FF E7 FF 79 FD CF FE ; .ýK ÐýIÿbÿçÿyýÏþ 00000030h: 20 FD 31 FE 31 FE 46 FE C2 FC EF FE 52 FD F0 FD ; ý1þ1þFþÂüïþRýðý 00000040h: 40 FD 37 FF 2A FD A5 FD 2F FC EA FF FB FD 92 FE ; @ý7ÿ*ý¥ý/üêÿûý’þ 00000050h: 8C FC 20 80 20 80 83 FE 81 FD 3E FF 39 FD D3 FD ; Œü € €ƒþý&gt;ÿ9ýÓý 00000060h: F1 FC 5E FC 34 FE 79 FD 83 FB 7F 7F 99 FE 2A FD ; ñü^ü4þyýƒû™þ*ý 00000070h: 20 FD AF FD 7A FC 20 80 2A FD 35 FD 20 80 20 80 ; ý¯ýzü €*ý5ý € € 00000080h: F1 FC AA FB 20 80 20 80 FF FC 12 FC 20 80 20 80 ; ñüªû € €ÿü.ü € € 00000090h: 46 FE D1 FC 20 80 20 80 20 80 5D FD 01 FF 76 FD ; FþÑü € € €]ý.ÿvý 000000a0h: FB FD E6 FC 30 02 40 FD F4 FD A4 FE BA 01 20 80 ; ûýæü0.@ýôý¤þº. € 000000b0h: 46 FE 7B FF AB 01 57 FC BC FF 57 FF 6B 01 80 FE ; Fþ{ÿ«.Wü¼ÿWÿk.€þ 000000c0h: 61 20 3E FF 58 02 68 FD 62 FF 69 FF 4A 01 D3 FD ; a &gt;ÿX.hýbÿiÿJ.Óý 000000d0h: E1 FE 0C FF EA FF 55 FE 49 FF 51 FE EE FF 93 FD ; áþ.ÿêÿUþIÿQþîÿ“ý 000000e0h: F8 20 E2 FD 25 FF CD FC 05 FF 80 FE BE FD D8 FC ; ø âý%ÿÍü.ÿ€þ¾ýØü </code></pre> <p>My function Call:</p> <pre><code>TrimBinary('testin.000','testout.000',106) </code></pre> <p>My Output:</p> <pre><code>00000000h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000010h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000020h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000030h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000040h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000050h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................ 00000060h: 00 00 00 00 00 00 00 00 00 00 7F 7F 99 FE 2A FD ; ..........™þ*ý 00000070h: 20 FD AF FD 7A FC 20 80 2A FD 35 FD 20 80 20 80 ; ý¯ýzü €*ý5ý € € 00000080h: F1 FC AA FB 20 80 20 80 FF FC 12 FC 20 80 20 80 ; ñüªû € €ÿü.ü € € 00000090h: 46 FE D1 FC 20 80 20 80 20 80 5D FD 01 FF 76 FD ; FþÑü € € €]ý.ÿvý 000000a0h: FB FD E6 FC 30 02 40 FD F4 FD A4 FE BA 01 20 80 ; ûýæü0.@ýôý¤þº. € 000000b0h: 46 FE 7B FF AB 01 57 FC BC FF 57 FF 6B 01 80 FE ; Fþ{ÿ«.Wü¼ÿWÿk.€þ 000000c0h: 61 20 3E FF 58 02 68 FD 62 FF 69 FF 4A 01 D3 FD ; a &gt;ÿX.hýbÿiÿJ.Óý 000000d0h: E1 FE 0C FF EA FF 55 FE 49 FF 51 FE EE FF 93 FD ; áþ.ÿêÿUþIÿQþîÿ“ý 000000e0h: F8 20 E2 FD 25 FF CD FC 05 FF 80 FE BE FD D8 FC ; ø âý%ÿÍü.ÿ€þ¾ýØü </code></pre> <p>What I want is That the file Starts with "7F 7F", not "00 00"???</p> <p>Can anyone reproduce this problem? Find a Solution? Know what's going on???????</p>
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    1. USAlex Byasse
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      1. POtransferTo Java.nio fils with 00's when run through Matlab JVM?
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    1. COWhat is the value of `n` here? And can you replace your pseudo-code with real code? (You're currently calling a constructor as if it were a method...)
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      1. USJon Skeet
    2. COn is 1341. this is how you write the code in matlab to utilize the internal jvm.
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      1. USAlex Byasse
    3. COOh - it would have been useful to explain that you're doing so, given that your question is only tagged `java` and `io`... please bear in mind relevant context when asking questions in future.
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