小编blu*_*112的帖子

我在内存中有一个完整的视频文件,我想用libav来解码整个帧.我该怎么办？关键是我可以使用avformat_open_input()函数直接从文件中读取,但我确实需要从存储在内存中的文件中进行.

我的AVIOContext实现:

class AVIOMemContext
{

public:

    AVIOMemContext(char* videoData, const int videoLen)
    {
        // Output buffer
        bufferSize = 32768;
        buffer = static_cast<char*>(av_malloc(bufferSize));

        // Internal buffer
        pos = 0;
        this->videoData = videoData;
        this->videoLen = videoLen;

        ctx_ = avio_alloc_context((unsigned char*) buffer, bufferSize, AVIO_FLAG_READ, this, &AVIOMemContext::read, &AVIOMemContext::write, &AVIOMemContext::seek);
    }

    ~AVIOMemContext()
    {
        av_free(videoData);
    }

    static int read(void *opaque, unsigned char *buf, int buf_size)
    {
        AVIOMemContext* This = static_cast<AVIOMemContext*>(opaque);

        // Read from pos to pos + buf_size
        if (This->pos + buf_size > This->videoLen)
        {
            int len …

我不在乎next()或error()重视。我是否仍需要将空函数定义为函数中的回调subscribe()？

我在使用Google Maps API V2时遇到了一些问题.我已经尝试了很多教程并搜索了很多答案(包括堆栈溢出),但我找到的所有都没有用.我可以用xml标签绘制地图<fragment>.没问题,它有效.但是当我试图让地图MainActivity.java getMap()返回null时我不知道为什么.

MainActivity.java

package com.example.testmaps;

import android.app.Activity;
import android.os.Bundle;

import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends Activity {
 private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    //HERE mMap IS NULL
    mMap.addMarker(new MarkerOptions()
            .position(new LatLng(10, 10))
            .title("Hello world"));
    }
}

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <fragment 
          android:id="@+id/map"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:name="com.google.android.gms.maps.MapFragment"/>

</RelativeLayout> 

的Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testmaps"
    android:versionCode="1" …

我陷入了zend框架,我是新手,试图实现一个网站只是为了学习它.所以我的网站是关于比萨饼的.当我尝试添加披萨时,在发送表单数据后,我收到此错误消息说:致命错误:在C:\ wamp\www\pizzalast\module\PizzaPoint\src\PizzaPoint中找不到类'PizzaPoint\Controller\Pizza'第27行的Controller\PizzaController.php,在这一行中,我实际上是一个位于"Model"文件夹中的类Pizza的对象.

这是披萨控制器的添加动作:

public function addAction()
    {
    $form = new PizzaForm();
    $form->get('submit')->setValue('Add');

    $request = $this->getRequest();
    if($request->isPost())
        {
        $pizza = new Pizza();
        $form->setInputFilter($pizza->getInputFilter());
        $form->setData($request->getPost());

            if($form->isValid())
                {
                    $pizza->exchangeArray($form->getData());
                    $this->getPizzaTable()->savePizza($pizza);
                }       
        }   
    return array('form' => $form);
    }

这些是Pizza.php文件的前40行代码:

namespace PizzaPoint\Model;

use Zend\InputFilter\InputFilter;
use Zend\InputFilter\InputFilterAwareInterface;

use Zend\InputFilter\InputFilterInterface;

class Pizza implements InputFilterAwareInterface {

public $id;
public $title;
public $zutaten;
public $smallprice;
public $bigprice;
public $familyprice;
public $partyprice;

protected $inputFilter;

public function exchangeArray($data)
    {
        $this->id            = (!empty($data['id']))         ? $data['id']         : null;
        $this->title         = (!empty($data['title']))      ? $data['title'] …

我有一个数组:

my @y = keys(%{$table->{fields}});

我想得到该数组的引用:

$columns = \@y;

有没有办法在一行上执行此操作？