Android ndk下用AssetManager读取assets的资源

static AAssetManager * gAssetMgr = NULL;
extern "C"
{
　　void Java_org_cocos2dx_lib_Cocos2dxActivity_nativeSetAssetManager(JNIEnv* env, jclass cls, jobject assetManager)
　　{
   　　gAssetMgr = AAssetManager_fromJava( env, assetManager );
　　}
};

do{
    AAsset * pAsset = AAssetManager_open(gAssetMgr, pszFileName, AASSET_MODE_UNKNOWN);
    if( pAsset == NULL ) break;
         size_t size = AAsset_getLength(pAsset);
         if( size > 0 )
         {
             pData = new unsigned char[size];
             int iRet = AAsset_read( pAsset, pData, size);
             if( iRet <= 0 )
             {
                 delete [] pData;
                 pData = NULL;
             }
         }
         AAsset_close(pAsset);
         if( pAsset == NULL ) size = 0;
         if( pSize )
             *pSize = size;
} while(0);