使用JNA调用C的DLL时,出现 Invalid memory access
@吕兵阳 你好,想跟你请教个问题:
C的原型函数:
/**
* 连接
* @param CLIENT 客户端
* @param ip 对端IP
* @param port 对端端口
*/
HFP_API void connect(CLIENT, const char*, unsigned short);
JAVA
void connect(long client, String ip, int port);
CLibrary.INSTANCE.connect(client, "58.215.39.12", 59000);
可否指教下呢?非常感谢~
java.lang.Error: Invalid memory access
at com.sun.jna.Native.invokeVoid(Native Method)
at com.sun.jna.Function.invoke(Function.java:374)
at com.sun.jna.Function.invoke(Function.java:323)
at com.sun.jna.Library$Handler.invoke(Library.java:236)
at com.sun.proxy.$Proxy2.connect(Unknown Source)
at com.maigangle.test.jna.JnaTest.simple(JnaTest.java:66)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
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评论(3)
1、各位大神,在用jna时,总是报错,如下
Exception in thread "main" java.lang.Error: Invalid memory access
at com.sun.jna.Native.invokeInt(Native Method)
at com.sun.jna.Function.invoke(Function.java:419)
at com.sun.jna.Function.invoke(Function.java:354)
at com.sun.jna.Library$Handler.invoke(Library.java:244)
at tzwy.chip.motor.$Proxy0.CH375WriteData(Unknown Source)
at tzwy.chip.motor.MotorDll.writeData(MotorDll.java:70)
at tzwy.chip.motor.MotorSingleton.initUSB(MotorSingleton.java:159)
at tzwy.chip.motor.MotorSingleton.initMotor(MotorSingleton.java:103)
at tzwy.chip.motor.MotorSingleton.main(MotorSingleton.java:21)
2、C的函数原型为
BOOL WINAPI CH375GetConfigDescr( // 读取配置描述符
ULONG iIndex, // 指定CH375设备序号
PVOID oBuffer, // 指向一个足够大的缓冲区,用于保存描述符
PULONG ioLength ); // 指向长度单元,输入时为准备读取的长度,返回后为实际读取的长度
3、jna封装为
interface MotorDllLibrary extends Library {
String fileName = "CH375DLL.DLL";
String filePath = MotorDllLibrary.class.getResource("").getPath().replaceFirst("/", "").replaceAll("%20", " ") + fileName;
MotorDllLibrary motor = (MotorDllLibrary) Native.loadLibrary(filePath, MotorDllLibrary.class);
/**
* 读取设备描述符
*
* @param index 指定CH375设备序号
* @param buff 指向一个足够大的缓冲区,用于保存描述符
* @param length 指向长度单元,输入时为准备读取的长度,返回后为实际读取的长度
* @return 0,失败;其他,成功
*/
int CH375GetDeviceDescr(int index, int[] buff, int length);
}
4、调用如下
public static void main(String[] args) {
try {
int[] s = new int[100];
int l = 0;
int deviceDescr = MotorDllLibrary.motor.CH375GetDeviceDescr(0,s,l);
System.out.println("deviceDescr:" + deviceDescr);
} catch (Exception e) {
e.printStackTrace();
}
}
5、有哪位大神知道怎么回事?
感觉不像你的错。
c函数的编写有问题。