how to use frida to watch va_list

[axhlzy]

JNI函数中会存在变长参数，大概看了一下应该处理为pointer

但是具体怎么处理，取得这里面的值的，还请大佬科普一下 /xk

[chame1eon]

Hi,

Thanks for your question. I hope this translates okay. JNI Trace hooks the getMethodID function so it can record how many Java arguments are used in a function. From this, it knows how many values to read from the variable-length parameters.

It is all automated so you do not need to worry about it. If you are using the jnitrace-engine plugin in your own project you get the Java arguments in the callback.

Hope that helps.

Thanks

[chame1eon]

Closing as over 2 weeks old.