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Id
20273537
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0
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0
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8
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CreationDate
2013-11-28T19:26:34.853
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0
LastActivityDate
2016-09-15T03:51:58.630
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2016-09-15T03:51:58.630
LastEditorUserId
336314
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1374704
ParentId
20258134
PostTypeId
2
Score
4
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0
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text
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For sure, you'll have to write a C function called by the Java code. As seen in the answer pointed to by Radiodef, that function will receive a <code>jobjectarray</code>, as a java <code>String[]</code> is represented in <code>jni</code> as a <code>jobjectArray</code>. In the function, you will have to malloc a C arrays, for storing all the char* pointers that your legacy <code>main</code> function is expecting in it's <code>char **argv</code> argument. You will store in that array malloced pointers, in order to be able to release the JNI objects immediately. You may avoid those malloc, but at the cost of storing JNI resources in another array for further release, so I don't think it's a goo idea. Remember that the convention for legacy main functions is that the first arg (index 0) is the 'program name'. You will have to fake it. <pre><code>void MyJNIFunction(JNIEnv *env, jobject object, jobjectArray stringArray) { // Get the number of args jsize ArgCount = (*env)->GetArrayLength(env, stringArray); // malloc the array of char* to be passed to the legacy main char ** argv = malloc(sizeof(char*)*(ArgCount+1)); // +1 for fake program name at index 0 argv[ 0 ] = "MyProgramName"; int i; for ( i = 0; i < ArgCount; ++i ) { jstring string = (jstring)((*env)->GetObjectArrayElement(env, stringArray, i)); const char *cstring = (*env)->GetStringUTFChars(env, string, 0); argv[ i + 1 ] = strdup( cstring ); (*env)->ReleaseStringUTFChars(env, string, cstring ); (*env)->DeleteLocalRef(env, string ); } // call the legacy "main" function LegacyMain( ArgCount + 1, argv ); // cleanup for( i = 0; i < ArgCount; ++i ) free( argv[ i + 1 ] ); free( argv ); return; } </code></pre>
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1. POwriting a JNI wrapper around a C main function
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