JNI converting jstring to char

Question

I have passed a URL string from Java to C code as jstring data type through the use of JNI  And my library method needs a char   as url   How can I convert jstring in char      P S   Is there any advantage of using jcharArray in C   i e  Passing char    instead of string in native method

User · Accepted Answer

Here s a a couple of useful link that I found when I started with JNI  http   en wikipedia org wiki Java Native Interface http   download oracle com javase 1 5 0 docs guide jni spec functions html  concerning your problem you can use this   JNIEXPORT void JNICALL Java ClassName MethodName JNIEnv  env  jobject obj  jstring javaString          const char  nativeString   env- gt GetStringUTFChars javaString  0          use your string     env- gt ReleaseStringUTFChars javaString  nativeString

User · Answer

Thanks Jason Rogers s answer first   In Android  amp  amp  cpp should be this   const char  nativeString   env- gt GetStringUTFChars javaString  nullptr       use your string  env- gt ReleaseStringUTFChars javaString  nativeString     Can fix this errors   1 error  base operand of  -   has non-pointer type  JNIEnv  aka  JNIEnv    2 error  no matching function for call to   JNIEnv  GetStringUTFChars JNIEnv  amp    jstring  amp   bool    3 error  no matching function for call to   JNIEnv  ReleaseStringUTFChars JNIEnv  amp    jstring  amp   char const  amp     4 add  env- DeleteLocalRef nativeString    at end

[java] JNI converting jstring to char *

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