以上就是给各位分享TheTargetofCocoaapplication，同时本文还将给你拓展AnapplicationsendstheWM_COPYDATAmessagetopassdatatoan

以上就是给各位分享The Target of Cocoa application，同时本文还将给你拓展An application sends the WM_COPYDATA message to pass data to another application、android – ApplicationStatus类E / SysUtils：ApplicationStat中的ApplicationContext为null、android – 尝试在Application类的实例上调用getApplicationContext()会导致null对象引用错误、Android 中this、getContext()、getApplicationContext()、getApplication()、getBaseContext() 之间的区别等相关知识，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

• The Target of Cocoa application
• An application sends the WM_COPYDATA message to pass data to another application
• android – ApplicationStatus类E / SysUtils：ApplicationStat中的ApplicationContext为null
• android – 尝试在Application类的实例上调用getApplicationContext()会导致null对象引用错误
• Android 中this、getContext()、getApplicationContext()、getApplication()、getBaseContext() 之间的区别

The Target of Cocoa application

An application sends the WM_COPYDATA message to pass data to another application

对于只是在有VB,VC开发两个应用程序中传递数组如此简单的数据，没必要用什么DLL,内存映射之类的大刀吧

WM_copYDATA Message

--------------------------------------------------------------------------------

An application sends the WM_copYDATA message to pass data to another application.

Syntax


To send this message,call the SendMessage function as follows.
lResult = SendMessage( // returns LRESULT in lResult (HWND) hWndControl,// handle to destination control (UINT) WM_copYDATA,// message ID (WParaM) wParam,// = (WParaM) () wParam; (LParaM) lParam // = (LParaM) () lParam; );
Parameters

wParam
Handle to the window passing the data.
lParam
Pointer to a copYDATASTRUCT structure that contains the data to be passed.
Return Value

If the receiving application processes this message,it should return TRUE; otherwise,it should return FALSE.


The copYDATASTRUCT structure contains data to be passed to another application by the WM_copYDATA message.

Syntax

typedef struct tagcopYDATASTRUCT {
ULONG_PTR dwData;
DWORD cbData;
PVOID lpData;
} copYDATASTRUCT,*PcopYDATASTRUCT;
Members

dwData
Specifies data to be passed to the receiving application.
cbData
Specifies the size,in bytes,of the data pointed to by the lpData member.
lpData
Pointer to data to be passed to the receiving application. This member can be NULL.

转来的,还没经过测试呢,如果有问题概不负责!!!

android – ApplicationStatus类E / SysUtils：ApplicationStat中的ApplicationContext为null

intent.putExtra("markerdata: ",assetVO);

markerdata = (HashMap<String,Object>) getIntent().getSerializableExtra("markerdata");

Bundle b = new Bundle();
            b.putSerializable("markerdata",assetVO);
            intent.putExtras(b);

Bundle extras = getIntent().getExtras();
markerdata = (HashMap<String,Object>) extras.getSerializable("markerdata");

android – 尝试在Application类的实例上调用getApplicationContext()会导致null对象引用错误

我正在尝试在我的Android应用中进行一些网络连接.

导致我的错误的事件序列如下：

在我的片段中,我得到了我的VolleySingleton类的一个新实例,如果还没有.

public static VolleySingleton getInstance() {
        if (vInstance == null) {
            vInstance = new VolleySingleton();
        }
        return vInstance;
    }

在创建VolleySingleton的实例时,我创建了一个请求队列并将其设置为等于Volley.newRequestQueue(myApplication.getContext());

    public class VolleySingleton {
    private static VolleySingleton sInstance = null;
    private ImageLoader imageLoader;
    private RequestQueue mRequestQueue;
    MyApplication myApplication = new MyApplication();

    private VolleySingleton() {
        mRequestQueue = Volley.newRequestQueue(myApplication.getAppContext());
        imageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() {
            private LruCache<String, Bitmap> cache = new LruCache<>((int)(Runtime.getRuntime().maxMemory()/1024/8));
            @Override
            public Bitmap getBitmap(String url) {
                return cache.get(url);
            }

            @Override
        public void putBitmap(String url, Bitmap bitmap) {
                cache.put(url, bitmap);
            }
        });
    }

    public static VolleySingleton getInstance() {
        if (sInstance == null) {
            sInstance = new VolleySingleton();
        }
        return sInstance;
    }

    public RequestQueue getRequestQueue() {
        return mRequestQueue;
    }

    public ImageLoader getimageLoader() {
        return imageLoader;
    }
}

现在,myApplication只是扩展Application的MyApplication类的一个实例,而getContext()只是在MyApplication的实例上调用getApplicationContext.以下是MyApplication类的代码：

public class MyApplication extends Application {

    private static MyApplication sInstance;
    public static final String API_KEY = "xxxxxxxx";

    @Override
    public void onCreate() {
        super.onCreate();
        sInstance=this;
    }

    public static MyApplication getInstance() {
        return sInstance;
    }

    public Context getAppContext() {
        return sInstance.getApplicationContext();
    }


}

当我尝试返回sInstance.getApplicationContext()时,似乎发生了错误;

我已经设法获得相同的代码在一个单独的测试项目中工作,所以我在这里不知所措.

这是我的logcat：

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context com.xxxxxxxxx.chessgame.Models.MyApplication.getApplicationContext()' on a null object reference
            at com.xxxxxxxxx.chessgame.Models.MyApplication.getAppContext(MyApplication.java:28)
            at com.xxxxxxxxxx.chessgame.Networking.VolleySingleton.<init>(VolleySingleton.java:25)
            at com.xxxxxxxxx.chessgame.Networking.VolleySingleton.getInstance(VolleySingleton.java:42)
            at com.xxxxxxxx.chessgame.RecyclerViews.FragmentViewOne.onCreate(FragmentViewOne.java:95)
            at android.support.v4.app.Fragment.performCreate(Fragment.java:1763)
            at android.support.v4.app.FragmentManagerImpl.movetoState(FragmentManager.java:913)
            at android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(FragmentManager.java:842)
            at android.support.v4.app.Fragment.setUserVisibleHint(Fragment.java:859)
            at android.support.v4.app.FragmentStatePagerAdapter.setPrimaryItem(FragmentStatePagerAdapter.java:152)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:1071)
            at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
            at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
            at android.view.View.measure(View.java:17430)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
            at android.view.View.measure(View.java:17430)
            at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:851)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
            at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
            at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
            at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560)
            at android.view.View.measure(View.java:17430)
            at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
            at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
            at android.view.Choreographer.doCallbacks(Choreographer.java:580)
            at android.view.Choreographer.doFrame(Choreographer.java:550)
            at android.view.Choreographer$FramedisplayEventReceiver.run(Choreographer.java:753)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.Act

解决方法:

请确保您在应用程序标记中将清单中的MyApplication类声明为android：name =“packagename.MyApplication”

Android 中this、getContext()、getApplicationContext()、getApplication()、getBaseContext() 之间的区别

Android 中this、getContext()、getApplicationContext()、getApplication()、getBaseContext() 之间的区别

关于The Target of Cocoa application的问题就给大家分享到这里，感谢你花时间阅读本站内容，更多关于An application sends the WM_COPYDATA message to pass data to another application、android – ApplicationStatus类E / SysUtils：ApplicationStat中的ApplicationContext为null、android – 尝试在Application类的实例上调用getApplicationContext()会导致null对象引用错误、Android 中this、getContext()、getApplicationContext()、getApplication()、getBaseContext() 之间的区别等相关知识的信息别忘了在本站进行查找喔。