Question

我正在使用matlab jvm和Java.Nio将二进制文件的主体复制到另一个没有标题的文件中。

我的代码是：

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();

和我想要的是一个十六进制的开始7F 7F（标题后我身体的开始）但我得到的是：

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

等等...等等...

为什么这样输出？我不能正确地写它？

编辑001。

我正在使用的matlab函数是：

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

我的测试输入是：

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>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 >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

我的功能致电：

TrimBinary('testin.000','testout.000',106)

我的输出：

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 >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

我想要的是文件以“7F 7F”开头，而不是“00 00”？

发生了什么事？

Answer 1

这个问题似乎源于在Linux上通过matlab运行内部jvm ....我在windows matlab上运行相同的代码，它工作正常。我可能应该在问题中运行我运行的linux matlab但是我虽然Java（所有关于可移植性的讨论）将在任一操作系统上运行完全相同（cept用于某些内存管理的东西），但显然不是用于编写文件？ ???生病了另一个问题，看看有没有人知道为什么这么好的原因??

由于

当通过Matlab JVM运行时，传输到00.的Java.nio文件？

1 个答案: