我有兩個問題：如何將 const unsigned char* 轉(zhuǎn)換為 jbyteArray？JNIEXPORT jbyteArray JNICALL Java_MyJavaApplication_readValue(JNIEnv* env, jobject obj){ const unsigned char* someConstUnsignedChar = (gcnew MyCSharpLibrary())->readValue(); // What should be here? return someJbyteArray;}如何將 jbyteArray 轉(zhuǎn)換為 const unsigned char*？JNIEXPORT jboolean JNICALL Java_MyJavaApplication_writeValue(JNIEnv* env, jobject obj, jbyteArray someJbyteArray){ // What should be here? return (gcnew MyCSharpLibrary())->writeValue(someConstUnsignedChar);}
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呼喚遠(yuǎn)方
TA貢獻(xiàn)1856條經(jīng)驗 獲得超11個贊
將 const unsigned char* 轉(zhuǎn)換為 jbyteArray：
#include <tuple>
JNIEXPORT jbyteArray JNICALL Java_MyJavaApplication_readValue(JNIEnv* env, jobject obj)
{
const unsigned char* someConstUnsignedChar;
int len;
std::tie(someConstUnsignedChar, len) = (gcnew MyCSharpLibrary())->readValue();
jbyteArray someJbyteArray = env->NewByteArray((jsize)len);
env->SetByteArrayRegion(someJbyteArray, 0, len, reinterpret_cast<const jbyte*>(someConstUnsignedChar));
return someJbyteArray;
}
將 jbyteArray 轉(zhuǎn)換為 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;
}
這個對我有用。
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