所以我决定对我的java代码进行dll
导入。
它的作用是计算邻居矩阵。问题是我不知道如何将矩阵作为jobjectArray
返回。
JNIEXPORT jobjectArray JNICALL Java_src_pathfinder_PathFinder_neighbourMatrixGenerator (JNIEnv * env, jobject b,...) {
int i,j;
BOOL tt=1;
jclass intClass = (*env)->FindClass(env, "java/lang/Integer");
jobjectArray row;
jobjectArray rows;
int **matrix = (int**)calloc(size, sizeof(int*));
for(i = 0; i < size; i++) {
matrix[i] = (int *) calloc(size, sizeof(int));
}
for(i=0; i<size; i++) {
row = (*env)->NewObjectArray(env, size, intClass, 0);
for(j=0; j<size; j++) {
(*env)->SetObjectArrayElement(env, row, j, (jobject)matrix[i][j]); // this line is 100% broken
}
if(tt==1) {
tt=0;rows = (*env)->NewObjectArray(env, size, (*env)->GetObjectClass(env, row), 0);
}
(*env)->SetObjectArrayElement(env, rows, i, row);
}
return rows;
}
我得到的错误:
Loaded generator.dll
counted total rects: 75
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x621e8551, pid=5336, tid=5704
#
# JRE version: Java(TM) SE Runtime Environment (8.0-b75) (build 1.8.0-ea-b75)
# Java VM: Java HotSpot(TM) Client VM (25.0-b17 mixed mode windows-x86 )
# Problematic frame:
# V [jvm.dll+0xc8551]
#
# Failed to write core dump. Minidumps are not enabled by default on client vers
ions of Windows
#
# An error report file with more information is saved as:
# C:\HnH\hs_err_pid5336.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/bugreport/crash.jsp
#
我很高兴能找到任何可能出错的线索,因为这对我来说是黑魔法
答案 0 :(得分:0)
似乎矩阵是pSize * pSize,那么首先需要新的pSize数组用于返回,然后需要新数组并存储在returnArray [i]中,并返回第一个数组。
BTW,这里显示的代码是纯java实现的良好候选者。我想如果经常调用它,性能会更好。