How can I get the time in Microsecond with JNI ?

How can I get the time in Microsecond with JNI ?

JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceFrequency (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lFrequency;
     ::QueryPerformanceFrequency(&lFrequency);
     return (jdouble)lFrequency.QuadPart;
JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceCounter (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lpCounter;
     ::QueryPerformanceCounter(&lpCounter);
     return (jdouble)lpCounter.QuadPart;

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