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锁定老帖子 主题:被隐藏了的JNA
该帖已经被评为隐藏帖
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发表时间:2010-12-01
最后修改:2011-03-14
如果在windows下 import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.Platform; public class HelloWorld { public interface CLibrary extends Library { CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"), CLibrary.class); void printf(String format, Object... args); } public static void main(String[] args) { CLibrary.INSTANCE.printf("in windows\n"); for (int i = 0; i < args.length; i++) { CLibrary.INSTANCE.printf("Argument %d: %s\n", i, args[i]); } } } 如果在linux下 顺便把c复习一下,准备做一个testadd的动态库,先测一下动态库是否好使, 先写3个文件test.h test.c testadd.c test.h #include <stdio.h> void add(); test.c #include <stdio.h> #include "test.h" int main() { printf("haha\n"); add(); } testadd.c #include <stdio.h> #include <unistd.h> void add() { char name[65]; printf("this is add \n"); gethostname(name, sizeof(name)); printf("hostname=%s\n",name); system("ls"); } 生成libtestadd.so 测试一下是否好使 [root@redhat5 c]# gcc -fpic -shared -o libtestadd.so testadd.c [root@redhat5 c]# gcc -o test test.c -I. -L. -ltestadd [root@redhat5 c]# ./test haha this is add hostname=122226 a.out libtestadd.so TestAddService.class test.h biji.txt main.c TestAddService.java y.tab.c JNA.chm test TestAddService$TestAdd.class jna.jar testadd.c test.c [root@redhat5 c]# yeh,"this is add"是libtestadd.so打印的, 现在用jna调用libtestadd.so 把jna.jar放到这个目录下 编写TestAddService.java import com.sun.jna.Library; import com.sun.jna.Native; public class TestAddService { public TestAddService() { } public interface TestAdd extends Library { TestAdd INSTANCE = (TestAdd) Native.loadLibrary("testadd",TestAdd.class); public void add(); } public static void main(String[] args) { TestAdd.INSTANCE.add(); System.out.println("哦 yeh yeh jna in linux"); } } [root@redhat5 c]# javac -cp .:jna.jar TestAddService.java [root@redhat5 c]# java -cp .:jna.jar TestAddService this is add hostname=122226 a.out libtestadd.so TestAddService.class test.h biji.txt main.c TestAddService.java y.tab.c JNA.chm test TestAddService$TestAdd.class jna.jar testadd.c test.c 哦 yeh yeh jna in linux 完了,java定义一个c接口就完了 ------------------------------ 难过啊,被隐藏了,还没被喷够呢! 简单方法难道不是好方法? webservice是很优雅,不闲麻烦?如果是同一台机器也要走http协议? java和c的互相调用只是一个接口 ,未必要传指针吧,性能部分当然用c解决,java只是简单的调用一下怎么了? 庆幸有人告诉了ACE,算是没白丢30分 Adaptive Communication Environment(自适配通信环境),简称ACE。为一个以C++的Template技术所做成的开放源代码的可跨平台的网络应用程序的程序库套件。它提供了socket/threading/memory management等多种系统调用的面对对象的wrapper,使C++通信软件开发更加简单 libevent轻量级一些 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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发表时间:2010-12-01
这样的例子基本没意义,至少要看到解决结构、指针、指针的指针这些复杂的东西才有意义。
比如这个很简单的例子 typedef struct _Point { int x, y; } Point; Point translate(Point pt, int dx, int dy); 翻译成JNA就很壮观了: class Point extends Structure { public static class ByValue extends Point implements Structure.ByValue { } public int x, y; } Point.ByValue translate(Point.ByValue pt, int x, int y); ... Point.ByValue pt = new Point.ByValue(); Point result = translate(pt, 100, 100); 通过这些复杂结构的例子,JNA是不是值得学就见仁见智了。 |
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发表时间:2010-12-01
我调用 MFC 编写的 DLL,直接报出一个错来:
# # An unexpected error has been detected by Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x78212c5b, pid=1448, tid=5092 # # Java VM: Java HotSpot(TM) Client VM (1.6.0-rc-b66 mixed mode) # Problematic frame: # C [MFC80D.DLL+0x42c5b] # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x00038c00): JavaThread "main" [_thread_in_native, id=5092] siginfo: ExceptionCode=0xc0000005, reading address 0x00370036 Registers: EAX=0x7400656e, EBX=0x2715158c, ECX=0x7400656e, EDX=0x00370026 ESP=0x008bf5cc, EBP=0x008bf5d4, ESI=0x008bf608, EDI=0x008bf7e8 EIP=0x78212c5b, EFLAGS=0x00010216 Top of Stack: (sp=0x008bf5cc) 0x008bf5cc: 783e97f0 00000000 008bf5ec 78211c6d 0x008bf5dc: 27132e80 008bf608 783e97f0 27132e80 0x008bf5ec: 008bf5fc 78212dd3 008bf804 008bf608 0x008bf5fc: 008bf7f8 27152402 008bf804 008bf7d4 0x008bf60c: ec7493d5 008bf8e0 00000000 2715158c 0x008bf61c: cccccccc cccccccc cccccccc cccccccc 0x008bf62c: 008bf608 cccccccc cccccccc cccccccc 0x008bf63c: cccccccc cccccccc cccccccc cccccccc Instructions: (pc=0x78212c5b) 0x78212c4b: 00 00 8b 45 08 8b 08 8b 55 08 8b 02 8b 11 8b c8 0x78212c5b: 8b 42 10 ff d0 89 45 f8 8b 4d 08 e8 35 f2 ff ff Stack: [0x008a0000,0x008c0000), sp=0x008bf5cc, free space=125k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) C [MFC80D.DLL+0x42c5b] C [MFC80D.DLL+0x41c6d] C [MFC80D.DLL+0x42dd3] C [NetUtil.dll+0x12402] C [jna596.dll+0xcbe7] C [jna596.dll+0xc7d9] C [jna596.dll+0x4561] C [jna596.dll+0x4ec1] j com.sun.jna.Function.invokePointer(I[Ljava/lang/Object;)Lcom/sun/jna/Pointer;+0 j com.sun.jna.Function.invokeString(I[Ljava/lang/Object;Z)Ljava/lang/String;+3 j com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;Z)Ljava/lang/Object;+517 j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+214 j com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+341 j $Proxy0.GetRespone(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;+20 j CallDll.main([Ljava/lang/String;)V+7 v ~StubRoutines::call_stub Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) j com.sun.jna.Function.invokePointer(I[Ljava/lang/Object;)Lcom/sun/jna/Pointer;+0 j com.sun.jna.Function.invokeString(I[Ljava/lang/Object;Z)Ljava/lang/String;+3 j com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;Z)Ljava/lang/Object;+517 j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+214 j com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+341 j $Proxy0.GetRespone(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;+20 j CallDll.main([Ljava/lang/String;)V+7 v ~StubRoutines::call_stub --------------- P R O C E S S --------------- Java Threads: ( => current thread ) 0x26dd3800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=4892] 0x26dd1000 JavaThread "CompilerThread0" daemon [_thread_blocked, id=5556] 0x26dd0000 JavaThread "Attach Listener" daemon [_thread_blocked, id=2232] 0x26dcf000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2524] 0x26d3f000 JavaThread "Finalizer" daemon [_thread_blocked, id=2572] 0x26d3e000 JavaThread "Reference Handler" daemon [_thread_blocked, id=5404] =>0x00038c00 JavaThread "main" [_thread_in_native, id=5092] Other Threads: 0x26d3b000 VMThread [id=3156] 0x26dd6800 WatcherThread [id=3992] VM state:not at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: None Heap PSYoungGen total 57344K, used 1966K [0x22970000, 0x26970000, 0x26970000) eden space 49152K, 4% used [0x22970000,0x22b5b8d8,0x25970000) from space 8192K, 0% used [0x26170000,0x26170000,0x26970000) to space 8192K, 0% used [0x25970000,0x25970000,0x26170000) PSOldGen total 458752K, used 0K [0x06970000, 0x22970000, 0x22970000) object space 458752K, 0% used [0x06970000,0x06970000,0x22970000) PSPermGen total 12288K, used 3030K [0x02970000, 0x03570000, 0x06970000) object space 12288K, 24% used [0x02970000,0x02c659d0,0x03570000) Dynamic libraries: 0x00400000 - 0x00410000 D:\develop_tools\Java\jdk1.6.0\bin\java.exe 0x7c920000 - 0x7c9b6000 C:\WINDOWS\system32\ntdll.dll 0x7c800000 - 0x7c91e000 C:\WINDOWS\system32\kernel32.dll 0x6d010000 - 0x6d01a000 D:\develop_tools\Java\jdk1.6.0\bin\jli.dll 0x7c340000 - 0x7c396000 D:\develop_tools\Java\jdk1.6.0\bin\MSVCR71.dll 0x77da0000 - 0x77e49000 C:\WINDOWS\system32\ADVAPI32.dll 0x77e50000 - 0x77ee3000 C:\WINDOWS\system32\RPCRT4.dll 0x77fc0000 - 0x77fd1000 C:\WINDOWS\system32\Secur32.dll 0x6d770000 - 0x6d9a6000 D:\develop_tools\Java\jdk1.6.0\jre\bin\client\jvm.dll 0x77d10000 - 0x77da0000 C:\WINDOWS\system32\USER32.dll 0x77ef0000 - 0x77f39000 C:\WINDOWS\system32\GDI32.dll 0x76b10000 - 0x76b3a000 C:\WINDOWS\system32\WINMM.dll 0x76300000 - 0x7631d000 C:\WINDOWS\system32\IMM32.DLL 0x62c20000 - 0x62c29000 C:\WINDOWS\system32\LPK.DLL 0x73fa0000 - 0x7400b000 C:\WINDOWS\system32\USP10.dll 0x6d2f0000 - 0x6d2f8000 D:\develop_tools\Java\jdk1.6.0\jre\bin\hpi.dll 0x76bc0000 - 0x76bcb000 C:\WINDOWS\system32\PSAPI.DLL 0x6d720000 - 0x6d72c000 D:\develop_tools\Java\jdk1.6.0\jre\bin\verify.dll 0x6d380000 - 0x6d39f000 D:\develop_tools\Java\jdk1.6.0\jre\bin\java.dll 0x6d760000 - 0x6d76f000 D:\develop_tools\Java\jdk1.6.0\jre\bin\zip.dll 0x270d0000 - 0x27125000 D:\sys_files\TEMP\jna596.dll 0x77be0000 - 0x77c38000 C:\WINDOWS\system32\msvcrt.dll 0x27140000 - 0x2716f000 D:\sys_files\desktop\JAVA_Proxy\bin\NetUtil.dll 0x781d0000 - 0x78416000 C:\WINDOWS\WinSxS\x86_Microsoft.VC80.DebugMFC_1fc8b3b9a1e18e3b_8.0.50727.42_x-ww_c8452471\MFC80D.DLL 0x27180000 - 0x272a0000 C:\WINDOWS\WinSxS\x86_Microsoft.VC80.DebugCRT_1fc8b3b9a1e18e3b_8.0.50727.42_x-ww_f75eb16c\MSVCR80D.dll 0x77f40000 - 0x77fb6000 C:\WINDOWS\system32\SHLWAPI.dll 0x770f0000 - 0x7717b000 C:\WINDOWS\system32\OLEAUT32.dll 0x76990000 - 0x76ace000 C:\WINDOWS\system32\ole32.dll 0x5d360000 - 0x5d36a000 C:\WINDOWS\WinSxS\x86_Microsoft.VC80.MFCLOC_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_0ccc058c\MFC80CHS.DLL VM Arguments: jvm_args: -Xms512M -Xmx512M -Xss128k -XX:+AggressiveOpts -XX:+UseParallelGC -XX:NewSize=64M java_command: CallDll Launcher Type: SUN_STANDARD Environment Variables: JAVA_HOME=D:\develop_tools\Java\jdk1.6.0 CLASSPATH=.;D:\develop_tools\Java\jdk1.6.0\lib\tools.jar;D:\develop_tools\Java\jdk1.6.0\lib\dt.jar;D:\develop_tools\Java\jdk1.6.0\lib\jardiff.jar;D:\develop_tools\Java\jdk1.6.0\lib\jnlp.jar;D:\develop_tools\Java\jdk1.6.0\htmlconverter.jar;D:\develop_tools\Java\jdk1.6.0\lib\jnlp-servlet.jar;D:\DEVELO~1\DB2\IBM\SQLLIB\java\db2java.zip;D:\DEVELO~1\DB2\IBM\SQLLIB\java\db2jcc.jar;D:\DEVELO~1\DB2\IBM\SQLLIB\java\sqlj.zip;D:\DEVELO~1\DB2\IBM\SQLLIB\java\db2jcc_license_cu.jar;D:\DEVELO~1\DB2\IBM\SQLLIB\bin;D:\DEVELO~1\DB2\IBM\SQLLIB\java\common.jar PATH=D:\develop_tools\Java\jdk1.6.0\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Intel\WiFi\bin\;d:\IsoBuster; USERNAME=Administartor OS=Windows_NT PROCESSOR_IDENTIFIER=x86 Family 6 Model 23 Stepping 10, GenuineIntel --------------- S Y S T E M --------------- OS: Windows XP Build 2600 Service Pack 3 CPU:total 2 family 6, cmov, cx8, fxsr, mmx, sse, sse2 Memory: 4k page, physical 2097151k(1295464k free), swap 4194303k(4194303k free) vm_info: Java HotSpot(TM) Client VM (1.6.0-rc-b66) for windows-x86, built on Jan 5 2006 11:41:03 by "java_re" with unknown MS VC++:1310 |
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发表时间:2010-12-01
有意义???
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发表时间:2010-12-01
最后修改:2010-12-01
感谢楼上几位的回复,尤其感谢ray_linn,java和c的交互,兼顾性能和易用性不知道是否有一些更稳定的技术?
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发表时间:2010-12-01
- -!,此贴要被隐藏。
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发表时间:2010-12-01
ICE吧 这个简单
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发表时间:2010-12-01
一点都不装,java调C,可以更优雅些,比如通过webservice,没有必要调得那么生硬。
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