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Thread: Retrieving arrays of java class inside C++ code

  1. #1
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    Default Retrieving arrays of java class inside C++ code

    Hi everyone,

    Currently i am working on JNI for native access between java and c++.

    Here goes my doubt:

    If i have to access an integer field (present inside my java class) in my c++ code, then the code is like this:
    jclass testC = env->FindClass("class name");
    jfieldID fid1 = env->GetFieldID(testC,"var","I");  //assuming the field name is var(type-int)
    jobject objC = env->AllocObject(testC);
    jint ret = env->GetIntField(objC,fid1);      //retrieving the value
    ret = 89;
    env->SetIntField(objC,fid1,ret);    //changing the value of 'var'

    But my problem is, if in the above case i have an integer array (instead of just an int),
    and i want to perform similar get and set operations on the array, then what would be the code?

    I have tried a lot for this, but not able to achieve this.

    It would be really great, if someone can fix this problem.

    With regards,
    sattu


  2. #2
    Moderators helloworld922's Avatar
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    Default Re: Retrieving arrays of java class inside C++ code

    Take a look at Accessing Basic Types, Strings, and Arrays using JNI. Section 3.3 details how to access both primitive and object arrays in C/C++ code.

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    sattu (May 20th, 2011)

  4. #3
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    Default Re: Retrieving arrays of java class inside C++ code

    Thanks helloworld,
    The link you provided is really beneficial. Will go through it.

    With regards,
    Satya Prakash.

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