Question

这是我的代码的缩写版本。我应该澄清＆＃34; initializeGrid（）＆＃34;表现得很好，所以为了简洁起见，我没有把它包括在内。我想得到＆＃34; threadFunction（）＆＃34;在args中打印值但它不起作用。请帮忙！

     <html> 
        <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
         <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.0-beta.2/angular.min.js"></script> 
    </head>
    <body>
              
    <div class="row">
    <!-- First Panel -->
        <div class="col-md-4">
            <div class="panel panel-default">
                <div class="panel-heading">First Panel</div>
            	      <div class="panel-body">
            	          <table class="table table-striped">
            	              <thead>
            	                  <tr>
            	                      <th>Name</th>
            	                  </tr>
            	              </thead>
            	              <tbody>
            	                  <tr>
            	                      <td><a data-toggle="collapse"                                                     href="#secondPanel">open second     panel</a>                                     </td>
            	                  </tr>
            	              </tbody>
            	          </table>	
            	      </div>
                </div>
            </div>
            		
            <!-- Second Panel -->
            <div class="col-md-4">
                <div class="panel panel-default panel-collapse collapse"                         id="secondPanel">
                    <div class="panel-heading">Second Panel</div>
                        <div class="panel-body">
                            <table class="table table-striped">
                                <thead>
                                </thead>
                                <tbody>
                                   <button type="button" class="btn btn-primary"                                    data-toggle="collapse"                                                            href="#thirdPanel">Reply</button>			
                                </tbody>
                            </table>					
                        </div>
                    </div>
            </div>
            <!-- Third Panel -->
            <div class="col-md-4">
                <div class="panel panel-default panel-collapse collapse"                         id="thirdPanel">
                    <div class="panel-heading">Third Panel</div>
                        <div class="panel-body">
                            <table class="table table-striped">
                                <thead>
                                </thead>
                                <tbody>
                                    <div class="well well-sm">some text</div>
           	                    </tbody>
                            </table>	
                        </div>
                    </div>
                </div>
            </div>
        </body>
    </html>

Answer 1

调用<uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />后，E/AndroidRuntime: FATAL EXCEPTION: main Process: degaming.bewegungsmelder, PID: 12580 java.lang.RuntimeException: takePicture failed at android.hardware.Camera.native_takePicture(Native Method) at android.hardware.Camera.takePicture(Camera.java:1711) at degaming.bewegungsmelder.MainActivity$1.onClick(MainActivity.java:36) at android.view.View.performClick(View.java:5642) at android.view.View$PerformClick.run(View.java:22338) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6209) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)函数会立即返回。

当main()返回时，进程退出并终止，同时生成每个线程。

您需要添加pthread_create()调用以等待线程终止。根据{{3}}：

main()函数将暂停执行调用线程直到目标pthread_join()终止

像这样：

pthread_join()

为什么我的线程没有正确生成？ C

1 个答案: