JNI将原生的无符号字符转换为jbyte数组

Í有JNI函数需要返回一个jbyte数组。 该数组包含带有数据的ac结构的字节数据。 但是当我将unsinged char数组的数据传递给jbyte数组时,我得到一个错误。

C结构定义如下:

// ObjectInfo struct definition
 struct ObjectInfo {
    int ObjectXCor;
    int ObjectYCor;
    int ObjectMass;
 };

 // ObjectInfo struct definition
 struct SensorDataStruct{
    int PingData;
    int IRData;
    int ForceData;
    int CompassData;
 };

 // ObjectInfo struct definition
 union PackedSend{
    struct CommStruct{
        ObjectInfo VisionData;
        SensorDataStruct SensorData;
    } CommData;
    unsigned char bytes[28];
 }SendData;

JNI方法定义如下:

JNIEXPORT jbyteArray JNICALL Java_com_example_communicationmodule_MainActivity_Convert(
    JNIEnv *env, jobject,
    jint var1,
    jint var2,
    jint var3,
    jint var4,
    jint var5,
    jint var6,
    jint var7)
{
// Array to fill with data
jbyteArray Array;

// Init  java byte array
Array = env->NewByteArray(28);

SendData.CommData.SensorData.PingData = var1;
SendData.CommData.SensorData.IRData = var2;
SendData.CommData.SensorData.ForceData = var3;
SendData.CommData.SensorData.CompassData = var4;
SendData.CommData.VisionData.ObjectXCor = var5;
SendData.CommData.VisionData.ObjectYCor = var6;
SendData.CommData.VisionData.ObjectMass = var7;

//Put the native unsigned chars in the java byte array
for(int Index=0; Index < 28; Index++){
    Array[Index] = SendData.bytes[Index];

}


// Return java array
return Array;
}

我得到的错误是:jni / HelperFunctions.cpp:44:38:错误:'*(Array +((unsigned int)Index)'= SendData.PackedSend :: bytes [Index] “

我的问题是wat是将本地unsigned char数组转换为jbyte数组的正确方法? Doe anyboy有一个建议吗? 欢迎所有提示!

更新

在转换为(jbyte)后,我得到以下错误:jni / HelperFunctions.cpp:54:46:错误:'*(Array +((unsigned int)Index)'=(jbyte) SendData.PackedSend :: bytes [Index]'jni / HelperFunctions.cpp:54:46:note:candidate is:C:/ android-ndk-r9 / platforms / android-8 / arch-arm / usr / include / jni。 h:66:7:note:_jbyteArray&_jbyteArray :: operator =(const _jbyteArray&)

铸造代码如下:

//Put the native unsigned chars in the java byte array
for(int Index=0; Index < 28; Index++){
    Array[Index] = (jbyte) SendData.bytes[Index];
}

有人有想法或建议吗? 欢迎来电!


env->SetByteArrayRegion(Array, 0, 28, (jbyte*)SendData.bytes)
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