Android ICS 4.0 NDK NewStringUTF 正在崩溃应用程序 [英] Android ICS 4.0 NDK NewStringUTF is crashing down the App

问题描述

我在 JNI C/C++ 中有一个方法，它接受 jstring 并返回 jstring，如下所示，

I have a method in JNI C/C++ which takes jstring and returns back jstring some thing like as below,

  NATIVE_CALL(jstring, method)(JNIEnv * env, jobject obj, jstring filename)
  {

// Get jstring into C string format.
  const char* cs = env->GetStringUTFChars (filename, NULL);
  char *file_path = new char [strlen (cs) + 1]; // +1 for null terminator
  sprintf (file_path, "%s", cs);
  env->ReleaseStringUTFChars (filename, cs);


  reason_code = INTERNAL_FAILURE;
  char* info = start_module(file_path);  


  jstring jinfo ;


  if(info==NULL)
  {
      jinfo = env->NewStringUTF(NULL);
  }
  else
  {
      jinfo = env->NewStringUTF(info);

  }


  delete info;

  info = NULL;
  return jinfo;
  }

该代码与之前的 android 4.0 版本(如 2.2、2.3 等)完美配合.使用 ICS 4.0 检查 JNI 默认情况下处于启用状态，因此应用程序崩溃并引发以下错误

The code works perfectly with prior android 4.0 versions like 2.2,2.3 and so on. With ICS 4.0 check JNI is on by default and because of it the app crashes throwing the following error

 08-25 22:16:35.480: W/dalvikvm(24027): **JNI WARNING: input is not valid Modified UTF-8: illegal  continuation byte 0x40**
08-25 22:16:35.480: W/dalvikvm(24027):              
08-25 22:16:35.480: W/dalvikvm(24027): ==========
08-25 22:16:35.480: W/dalvikvm(24027): /tmp/create
08-25 22:16:35.480: W/dalvikvm(24027): ==========
08-25 22:16:35.480: W/dalvikvm(24027): databytes,indoorgames,drop
08-25 22:16:35.480: W/dalvikvm(24027): ==========���c_ag����ϋ@�ډ@�����@'
 08-25 22:16:35.480: W/dalvikvm(24027):              in Lincom/inter       /ndk/comNDK;.rootNDK:(Ljava/lang/String;)Ljava/lang/String; **(NewStringUTF)**
08-25 22:16:35.480: I/dalvikvm(24027): "main" prio=5 tid=1 NATIVE
08-25 22:16:35.480: I/dalvikvm(24027):   | group="main" sCount=0 dsCount=0 obj=0x40a4b460   self=0x1be1850
08-25 22:16:35.480: I/dalvikvm(24027):   | sysTid=24027 nice=0 sched=0/0 cgrp=default handle=1074255080
08-25 22:16:35.490: I/dalvikvm(24027):   | schedstat=( 49658000 26700000 48 ) utm=1 stm=3 core=1
08-25 22:16:35.490: I/dalvikvm(24027):   at comrootNDK(Native Method)

我不知道我错在哪里.如果您在上面看到 NewStringUTF 正在向 c Char* 字节添加一些垃圾值.

I am clueless as to where i am wrong. If you see above NewStringUTF is adding some garbage value to the c Char* bytes .

1. 知道为什么会这样
2. 欢迎任何实现上述目标的替代解决方案

如果你们中的任何一个可以帮助我，我真的很感激.提前致谢

I really appreciate if one of you can help me in . Thanks in advance

规则我

推荐答案

我通过返回字节数组而不是字符串解决了这个问题.在 Java 方面，我现在将 Byte 数组转换为 Strings .工作正常！避免在 Android 4.0 及更高版本中使用 NewStringUTF()，因为 Google Android NDK 上已经报告了一个错误.

I resolved this issue by returning byte array instead of String. On the Java side i am now converting the Byte array to Strings .Works fine! Stay away from using NewStringUTF() for Android 4.0 and above as there is already a bug reported on Google Android NDK.

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