public class FileList{

public static native String[] list(String path,int len);
static native final void initialize();
public static native final void destroy();
static{
try{
System.loadLibrary("cfilelist");
initialize();
}catch(Exception ex){}
}
}

#include<unistd.h>
#include<stdio.h>
#include<dirent.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<string.h>

#include "FileList.h"
static jclass string_class;
void jni_log(const char *str){

}

JNIEXPORT void JNICALL Java_FileList_initialize
(JNIEnv *env, jclass jcls){
jclass jstring_cls;
jstring_cls=(*env)->FindClass(env,"java/lang/String");
if(jstring_cls)
{
string_class=(*env)->NewGlobalRef(env,jstring_cls);
}
}

JNIEXPORT void JNICALL Java_FileList_destroy
(JNIEnv *env, jclass jcls){
(*env)->DeleteGlobalRef(env, string_class);
}

JNIEXPORT jobjectArray JNICALL Java_FileList_list
(JNIEnv *env, jclass jcls, jstring jstrdir, jint jfcount){
int f_count;
jobjectArray jresult;
DIR *pDir;
char absPath[255];
struct dirent *entry;
struct stat statbuf;
char *p_ch;
const char *dir;
if(string_class==NULL){
jni_log("string_class==NULL");
return NULL;
}
dir=(*env)->GetStringUTFChars(env,jstrdir,0);
if(dir==NULL)
{
jni_log("dir==NULL");
return NULL;
}
jresult=(*env)->NewObjectArray(env,(jsize)jfcount,string_class,NULL);
if(jresult==NULL){
jni_log("jresult==null");
return NULL;
}
f_count=0;
if((pDir = opendir(dir)) == NULL){
jni_log("open dir = null");
jni_log(dir);
return NULL;
}
chdir(dir);
while((entry = readdir(pDir)) != NULL){
lstat(entry->d_name,&statbuf);
if(S_ISDIR(statbuf.st_mode)) continue; //if(strcmp(entry->d_name,".")==0||strcmp(entry->d_name,"..")==0)continue;
strcpy(absPath,dir);
strcat(absPath,"/");
strcat(absPath,entry->d_name);
jstring jfilestr=(*env)->NewStringUTF(env,absPath);
(*env)->SetObjectArrayElement(env,jresult,(jsize)f_count,jfilestr);
f_count++;
if(f_count>=jfcount)break;
}
closedir(pDir);
chdir("..");
(*env)->ReleaseStringUTFChars(env,jstrdir,dir);
return jresult;
}