场景说明
    将一个GBK编码的字符串返回给Java层

误区
    因为这是一个GBK编码的char*字符串，不可能直接调用函数直接返回：
char* p;
jstring encoding = (env)->NewStringUTF(p);
    出现如下的错误：the key point is "Modified UTF-8"is not like "Regular UTF-8", a legal Rgular UTF8 code sequence may beconsidered illegal against Modified UTF8.

正确的方式
    需要构建一个GBK编码的jstring,在参数中指定字符串的编码格式
jstring cToJstringutf(JNIEnv* env, char* pat)
{
  jclass strClass = (env)->FindClass("java/lang/String"); 
  jmethodID ctorID = (env)->GetMethodID(strClass, "", 
    "([BLjava/lang/String;)V"); 
  jbyteArray bytes = (env)->NewByteArray(strlen(pat)); 
  (env)->SetByteArrayRegion(bytes, 0, strlen(pat), (jbyte*) pat); 
  jstring encoding = (env)->NewStringUTF("gb2312"); 
  jstring jstr = (jstring)(env)->NewObject(strClass, ctorID, bytes, encoding);
  env->DeleteLocalRef(strClass);
  env->DeleteLocalRef(bytes);
  env->DeleteLocalRef(encoding);
  return jstr;
}

问题编译过程中出现警告：
    uses2-byte wchar_t yet the output is to use 4-byte wchar_t;use of wchar_t valuesacross objects may fail
 
 
 Android 崩溃信息一览
 
 1 E/IzatSvc_PassiveLocListener(1718): E/Exiting with error virtual void izat_manager::IzatPassiveLocationListener::onLocationChanged(const izat_manager::IzatLocation*, izat_manager::IzatLocationStatus) line 113 "1"

2 MediaPlayer: Error (-38,0)