I want to call main:
int main(int argc, char *argv[])
I tried this link: How to use JNI to call a "main" function that takes an array of character pointers?
JNIEXPORT jint JNICALL Java_package_Class_lameMain(JNIEnv *env, jclass class, jobjectArray jargv)
{ //jargv is a Java array of Java strings
int argc = env->GetArrayLength(jargv);
typedef char *pchar;
pchar *argv = new pchar[argc];
int i;
for(i=0; i<argc; i++)
{
jstring js = env->GetObjectArrayElement(jargv, i); //A Java string
const char *pjc = env->GetStringUTFChars(js); //A pointer to a Java-managed char buffer
size_t jslen = strlen(pjc);
argv[i] = new char[jslen+1]; //Extra char for the terminating null
strcpy(argv[i], pjc); //Copy to *our* buffer. We could omit that, but IMHO this is cleaner. Also, const correctness.
env->ReleaseStringUTFChars(js, pjc);
}
//Call main
main(argc, argv);
//Now free the array
for(i=0;i<argc;i++)
delete [] argv[i];
delete [] argv;
}
but it doesn't work because I'm programming on C not C++. after I make some changes there is a problem in "GetArrayLength" this error:
error: request for member 'GetArrayLength' in something not a structure or union
I also tried this link: How to call the main function in C file by JNI in Android?
JNIEXPORT return_type JNICALL Java_full_package_name_classname_functionname(JNIEnv *env, jobject object, Jobject stringArray){
// your argc
int size = env->GetArrayLength(stringArray);
char **argv = new char*[size];
for (int i=0; i < size; ++i)
{
jstring string = env->GetObjectArrayElement(stringArrays, i);
const char* cString = env->GetStringUTFChars(string, 0);
argv[i] = strdup(cString);
env->ReleaseStringUTFChars(string, myarray);
env->DeleteLocalRef(string);
}
// you will need to modify main so it does properly cleanup
main(argc, argv);
// clean up
for(int i = 0; i < size; ++i)
free(argv[i]);
delete [] argv;
}
the error was: expected ';' or ',' befor Java_package_Class_lameMain
Do like this with repdect to your functions:
JNIEXPORT void JNICALL Java_ClassName_MethodName
(JNIEnv *env, jobject obj, jstring javaString)
{
const char *nativeString = (*env)->GetStringUTFChars(env, javaString, 0);
(*env)->ReleaseStringUTFChars(env, javaString, nativeString);
}
The thing is to use *env
See C-example here http://en.wikipedia.org/wiki/Java_Native_Interface