Android的使用C从资源文件夹读取文本文件(NDK) [英] Android read text file from asset folder using C (ndk)
问题描述
我需要阅读从资源文件夹中的android文本文件,通过网络搜索,我发现有可用的Android 2.3起asset_manager API。由于我只针对平板设备,这是很有用的。但正如我不是专家在C语言中,我无法找到如何读取任何例子/写使用文件描述符文件。我发现使用FILE *许多例子(文件指针)
我的目标是从解密文件夹资产JS文件被加密
使用C(用于固定code),因为JS code是可见的,如果最终用户
反编译我的APK。由于资产文件夹是zip文件里面是有可能这样做?
块引用>解决方案下面是code我用来读取Android的资产文件夹使用asset_manager NDK的lib
AAssetManager *经理= AAssetManager_fromJava(ENV,assetManager);
AAsset *资产= AAssetManager_open(MGR,(为const char *)JS,AASSET_MODE_UNKNOWN);
如果(NULL ==资产){
__android_log_print(ANDROID_LOG_ERROR,NF_LOG_TAG_ASSET_NOT_FOUND_);
返回JNI_FALSE;
}
长尺寸= AAsset_getLength(资产);
字符*缓冲=(字符*)malloc的(的sizeof(char)的*大小);
AAsset_read(资产,缓冲液,大小);
__android_log_print(ANDROID_LOG_ERROR,NF_LOG_TAG,缓冲区);
AAsset_close(资产);添加下面一行到我的Android.mk
#为本地资产管理公司
LOCAL_LDLIBS + = -landroid和不要忘了包括源文件
的#include<机器人/ asset_manager.h>
I need to read text file from asset folder in android, by searching through internet I found that there is asset_manager api available from android 2.3 onwards. As I am targeting only tablet devices this is useful. But as I am not expert in C language I am not able to find any example on how to read/write files using file descriptor. I found many examples using FILE* (file pointers)
My goal is to decrypt a js file from asset folder which is encrypted using C (for securing the code), as js code is visible if end user decompiled my apk. Because asset folder is inside zip file is it possible to do?
解决方案Here is the code I used to read file from android assets folder using asset_manager ndk lib
AAssetManager* mgr = AAssetManager_fromJava(env, assetManager); AAsset* asset = AAssetManager_open(mgr, (const char *) js, AASSET_MODE_UNKNOWN); if (NULL == asset) { __android_log_print(ANDROID_LOG_ERROR, NF_LOG_TAG, "_ASSET_NOT_FOUND_"); return JNI_FALSE; } long size = AAsset_getLength(asset); char* buffer = (char*) malloc (sizeof(char)*size); AAsset_read (asset,buffer,size); __android_log_print(ANDROID_LOG_ERROR, NF_LOG_TAG, buffer); AAsset_close(asset);
Added following line to my Android.mk
# for native asset manager LOCAL_LDLIBS += -landroid
And don't forget the include in source file
#include <android/asset_manager.h>
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