我有一个JNI方法来访问返回Integer对象的java方法.我不想返回原始int类型,因为将修改此代码以处理Generic对象.以下是我所拥有的.我无法获得通过的Integer的值.C++方面的输出类似于
value = 0x4016f3d0
如何获得我在C++端传递的Integer对象的实际值？
请帮忙.
谢谢,
-H
GenericPeer.cpp
JNIEXPORT void JNICALL Java_GenericPeer_print (JNIEnv *jenv, jclass jcls, jobject data){
jclass peerCls = jenv->GetObjectClass(data);
jmethodID mGetValue = jenv->GetMethodID(peerCls, "getValue","()Ljava/lang/Integer;");
if(mGetValue == NULL){
return (-1);
}
jobject value = jenv->CallObjectMethod(data, mGetValue);
cout<<"value = "<<value<<endl;
}
GenericPeer.java
public class GenericPeer {
public static native void print(Data d);
static {
System.load("/home/usr/workspace/GenericJni/src/libGenericJni.so");
}
}
Data.java
public class Data {
private Integer value;
pubilc Data(Integer v){
this.value = v;
}
public Integer getValue() { return value; …我通过调用mkfifo()命令使用JNI创建命名管道.我使用的是mode = 0666.
我正在尝试使用Java写入管道,但是在写入管道时我遇到了问题.我被困在以下一行并且无法通过它.我也没有收到任何错误.
PrintWriter out = new PrintWriter((new BufferedWriter(new FileWriter(pipePath))));
请帮忙.
问候,
-H
PipePeer.java
import java.io.*;*
public class PipePeer {
private native int createPipe(String pipeName, int mode);* // --------> native method to call mkfifo(pipeName, mode);
static {
System.load("/home/user/workspace/Pipes/libpipe.so");
}
public static void main(String[] args) {
PipePeer p = new PipePeer();
PipeImplement pi = new PipeImplement();
String pipePath = "/home/user/workspace/Pipes/pipeFolderpipe1";
int mode = 0777;
int createResult = p.createPipe(pipePath, mode);
if (createResult == 0)
System.out.println("Named pipe created successfully");
else
System.out.println("Error: couldnot …我试图返回一个简单的数组,但我没有得到正确的结果.我得到以下内容
arr1[0] = 1
arr1[1] = 32767
结果应该是结果
arr1[0] = 1
arr1[1] = 15
请建议.
int *sum(int a, int b){
int arr[2];
int *a1;
int result = a+b;
arr[0]= 1;
arr[1]= result;
a1 = arr;
return a1;
}
int main(){
int *arr1 = sum(5,10);
cout<<"arr1[0] = "<<arr1[0]<<endl;
cout<<"arr1[1] = "<<arr1[1]<<endl;
return 0;
}