GetByteArrayElementsとReleaseByteArrayElements
1898 ワード
GetByteArrayElementsの公式解釈:
Returns the body of the primitive array. The result is valid until the corresponding ReleaseArrayElements function is called.Since the returned array may be a copy of the original array, changes made to the returned array will not necessarily be reflected in the original array until a corresponding ReleaseArrayElementsis called. IfisCopyis notNULL, then*isCopyis set toJNI_TRUEif a copy is made; if no copy is made, it is set toJNI_FALSE.
使用中
解決方法:http://blog.csdn.net/rainlight/article/details/818964
実は現代コードは次のようなものかもしれません
+void +KaffeJNI_ReleaseByteArrayElements(JNIEnv* env UNUSED, jbyteArray arr, jbyte* elems, jint mode) +{ + BEGIN_EXCEPTION_HANDLING_VOID();++ if (elems != unhand_array((HArrayOfByte*)arr)->body) { + switch (mode) { + case JNI_COMMIT: + memcpy(unhand_array((HArrayOfByte*)arr)->body, elems, obj_length((HArrayOfByte*)arr) * sizeof(jbyte)); + break; + case 0: + memcpy(unhand_array((HArrayOfByte*)arr)->body, elems, obj_length((HArrayOfByte*)arr) * sizeof(jbyte)); + KFREE(elems); + break; + case JNI_ABORT: + KFREE(elems); + break; + } + } + END_EXCEPTION_HANDLING(); +}
JNI_COMMIT forces the native array to be copied back to the original array in the Java virtual machine.JNI_ABORTfrees the memory allocated for the native array without copying back the new contents
Returns the body of the primitive array. The result is valid until the corresponding Release
使用中
GetByteArrayElementsbyteBuffer = env->GetByteArrayElements(buffer, JNI_FALSE);
/* 0 ， 。
， byteBuffer buffer ( )，
： env->ReleaseByteArrayElements(buffer, byteBuffer, 0);
*/ReleaseByteArrayElementsenv->ReleaseByteArrayElements(buffer, byteBuffer, JNI_FALSE);
/* , 0 m . M ,
Release . JNI_COMMIT .
*/解決方法:http://blog.csdn.net/rainlight/article/details/818964
実は現代コードは次のようなものかもしれません
+void +KaffeJNI_ReleaseByteArrayElements(JNIEnv* env UNUSED, jbyteArray arr, jbyte* elems, jint mode) +{ + BEGIN_EXCEPTION_HANDLING_VOID();++ if (elems != unhand_array((HArrayOfByte*)arr)->body) { + switch (mode) { + case JNI_COMMIT: + memcpy(unhand_array((HArrayOfByte*)arr)->body, elems, obj_length((HArrayOfByte*)arr) * sizeof(jbyte)); + break; + case 0: + memcpy(unhand_array((HArrayOfByte*)arr)->body, elems, obj_length((HArrayOfByte*)arr) * sizeof(jbyte)); + KFREE(elems); + break; + case JNI_ABORT: + KFREE(elems); + break; + } + } + END_EXCEPTION_HANDLING(); +}
JNI_COMMIT forces the native array to be copied back to the original array in the Java virtual machine.JNI_ABORTfrees the memory allocated for the native array without copying back the new contents