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POAndroid NDK JNI Call Returning Different Values
 

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  1. POAndroid NDK JNI Call Returning Different Values
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    <p>I am building an augmented reality application using the Android SDK/NDK and the qualcomm AR SDK. Part of my application requires me to pass multiple float arrays over to the native side of the program to deal with model dimensions. </p> <p>My problem is that when I pass them as parameters, they seem to be coming out differently at the other side. I will post a stripped down version of my code:</p> <pre><code>#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR , "NATIVE LOG", __VA_ARGS__) float* vertArray; JNIEXPORT void JNICALL Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_loadModelDimensions(JNIEnv* env, jobject obj, jfloatArray tVertices) { //used to free the memory at the end int verticesLength = env-&gt;GetArrayLength(tVertices); //the float* where the jfloatArray passes the elements vertArray = env-&gt;GetFloatArrayElements(tVertices, 0); //testing purposes below char bufferResult[200]; sprintf(bufferResult, "Array: %f", vertArray[0]); LOGE(bufferResult); } </code></pre> <p>The LOGE method just allows me to post back a string to the android logcat, the vertArray[0] element is 11.2222 but so far I have been getting results such as:</p> <p>Array: 3.365105 Array: 3.270681 Array: 3.280375</p> <p>So far I have tested using a normal C array to check sprintf works and it does, I have also passed over a jint instead of a jfloatArray and that also displays correctly.</p> <p>Is there a reason why it would be returning ~3 everytime, no matter what element in the array I am asking for? (I am passing in 4 arrays and they all do the same thing)</p> <p>EDIT: Java call:</p> <pre><code>//native call to load dimensions loadModelDimensions(Vertices); </code></pre>
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    1. COShow your LOGE macro or function. Also try moving float* vertArray definition inside the function as local variable. And also try calling ReleaseFloatArrayElements when you are done with using array elements.
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      1. USMārtiņš Možeiko
    2. COWhat's your Java native declaration for this method?
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