我有两个问题:
如何将const unsigned char *转换为jbyteArray?
JNIEXPORT jbyteArray JNICALL Java_MyJavaApplication_readValue(JNIEnv* env, jobject obj)
{
const unsigned char* someConstUnsignedChar = (gcnew MyCSharpLibrary())->readValue();
// What should be here?
return someJbyteArray;
}
如何将jbyteArray转换为const unsigned char *?
JNIEXPORT jboolean JNICALL Java_MyJavaApplication_writeValue(JNIEnv* env, jobject obj, jbyteArray someJbyteArray)
{
// What should be here?
return (gcnew MyCSharpLibrary())->writeValue(someConstUnsignedChar);
}
将const无符号char *转换为jbyteArray:
#include <mbstring.h>
JNIEXPORT jbyteArray JNICALL Java_MyJavaApplication_readValue(JNIEnv* env, jobject obj)
{
const unsigned char* someConstUnsignedChar = (gcnew MyCSharpLibrary())->readValue();
jsize len = (jsize)_mbslen(someConstUnsignedChar);
jbyteArray someJbyteArray = env->NewByteArray(len);
env->SetByteArrayRegion(someJbyteArray, 0, len, reinterpret_cast<const jbyte*>(someConstUnsignedChar));
return someJbyteArray;
}
将jbyteArray转换为const unsigned char *:
JNIEXPORT jboolean JNICALL Java_MyJavaApplication_writeValue(JNIEnv* env, jobject obj, jbyteArray someJbyteArray)
{
jsize len = env->GetArrayLength(someJbyteArray);
jbyte* body = env->GetByteArrayElements(someJbyteArray, 0);
unsigned char* someUnsignedChar = new unsigned char[len];
for (jint i = 0; i < len; i++)
{
someUnsignedChar[i] = (unsigned char)body[i];
}
bool result = (gcnew MyCSharpLibrary())->writeValue((const unsigned char*)someUnsignedChar);
env->ReleaseByteArrayElements(someJbyteArray, body, 0);
return (jboolean)result;
}
它对我有用。