将字符串从 Java 传递到 JNI [英] Passing string from Java into JNI

问题描述

I want to pass a string into the JNI I am writing which have to be assigned to a const char*. The below mentioned is how I have done it:

JNI...(...,jstring jstr...){

const char* str = env->GetStringUTFChars(jstr,0);
env->ReleaseStringUTFChars(str,jstr,0);

}

But if i printf the const char* str after assigning to the jstring what I see is different as compared to when I assigned the str value directly in the JNI and printf from there.

Is this the correct way to do? Or is there any other way to assign a string from java to const char* in JNI ?

解决方案

java code

public static native double myMethod( String path);  

C Code

JNIEXPORT jdouble JNICALL Java_your_package_structure_className_myMethod
(JNIEnv * env, jobject jobj, jstring pathObj) {
     char * path;

    path = (*env)->GetStringUTFChars( env, pathObj, NULL ) ;

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