线程冻结应用程序 [英] Thread freezing the application

问题描述

我正在设计一个应用程序，它可以读取 DICOM 数据集，并可视化他们使用 VTK 图书馆的音量呈现技术。反正，我处理的问题是体绘制是真正的CPU限制的过程。如果我在单个线程进程中处理卷渲染，应用程序（GUI）冻结并传递到无响应状态。我已经写了另一个线程进行体绘制过程。但是GUI仍然冻结，这里是代码。

  private：System :: Void volumeRenderButton_Click（System :: Object ^ sender，System :: EventArgs ^ e）{ 
 
 volumeRenderThread = gcnew System :: Threading :: Thread（gcnew System :: Threading :: ThreadStart（this，& Form1 :: volumeRender））; 
 volumeRenderThread-> Priority = System :: Threading :: ThreadPriority :: Lowest; 
 volumeRenderThread-> Start（）; 
} 
 
 private：void volumeRender（）
 {
 threeDPictureBox-> Invoke（gcnew volumeDelegate（this，& Form1 :: volumeDelegateMethod））; 
 
 / * 
 if（threeDPictureBox-> InvokeRequired）
 {
 threeDPictureBox-> Invoke（gcnew System :: Action（this，& Form1 :: volumeRender））; 
} 
 else 
 {
 dicom-> VolumeRender（threeDPictureBox，vrSettings）; 
} 
 * / 
} 
 private：delegate void volumeDelegate（）; 
 
 private：void volumeDelegateMethod（）
 {
 dicom-> VolumeRender（threeDPictureBox，vrSettings）; 
} 
 
 
 void Dicom :: VolumeRender（Windows :: Forms :: PictureBox ^ pictureBox，VRsettings * settings）
 {
 renderer = vtkSmartPointer< ; vtkRenderer> :: New（）; 
 renderWindow = vtkSmartPointer< vtkWin32OpenGLRenderWindow> :: New（）; 
 renderWindow-> AddRenderer（renderer）; 
 renderWindow-> SetParentId（（HWND）（（pictureBox-> Handle）.ToPointer（）））; 
 renderWindow-> SetSize（pictureBox-> Width，pictureBox-> Height）; 
 renderWindow-> Initialize（）; 
 / *很多东西在这里* / 
 ... 
 ... 
 renderWindow-> Render（）; 
 iren-> Initialize（）; // vtkWin32RenderWindowInteractor 
 
} 
  

threeDPictureBox是一个PictureBox组件将其发送到dicom对象的volumeRender方法。 vrSettings是卷呈现参数的结构。

当点击音量渲染按钮并点击事件处理程序时，volumeRenderThread会启动并冻结应用程序，即使我已设置其优先级最低！我也试过了评论的线。他们没有工作。什么是我错过了点？感谢您的回答！

解决方案

您的线程是在立即跳转到UI线程的方法上调用的。 p>

换句话说，它有一个动作：告诉UI线程做这项工作。

I'm designing an application which reads DICOM data sets and visualizes them with volume rendering techniques by using VTK library. Anyway, the problem I'm dealing is volume rendering is really CPU-bounded process. If I handle the volume rendering in a single threaded process, application (GUI) freezes and passes to "not responding" state. I have written another thread for volume rendering process. However GUI still freezes, here are the codes.

private: System::Void volumeRenderButton_Click(System::Object^  sender, System::EventArgs^  e) {

             volumeRenderThread = gcnew System::Threading::Thread(gcnew System::Threading::ThreadStart(this, &Form1::volumeRender));
             volumeRenderThread->Priority = System::Threading::ThreadPriority::Lowest;
             volumeRenderThread->Start();                                   
         }

private: void volumeRender()
         {
             threeDPictureBox->Invoke(gcnew volumeDelegate(this, &Form1::volumeDelegateMethod));        

             /*
             if ( threeDPictureBox->InvokeRequired )
             {
                threeDPictureBox->Invoke(gcnew System::Action(this, &Form1::volumeRender));
             }
             else
             {
                 dicom->VolumeRender(threeDPictureBox, vrSettings); 
             }
             */
         }
private: delegate void volumeDelegate();

private: void volumeDelegateMethod()
         {
             dicom->VolumeRender(threeDPictureBox, vrSettings); 
         }


void Dicom::VolumeRender( Windows::Forms::PictureBox ^pictureBox, VRsettings *settings )
{
    renderer = vtkSmartPointer < vtkRenderer > :: New();
    renderWindow = vtkSmartPointer < vtkWin32OpenGLRenderWindow > :: New();
    renderWindow->AddRenderer(renderer);
    renderWindow->SetParentId((HWND)((pictureBox->Handle).ToPointer()));
    renderWindow->SetSize(pictureBox->Width, pictureBox->Height);
    renderWindow->Initialize();
    /* A lot of stuff here */
    ...
    ...
    renderWindow->Render();
    iren->Initialize();     // vtkWin32RenderWindowInteractor

}

threeDPictureBox is a PictureBox component that I'm sending it to volumeRender method of dicom object. vrSettings is a struct for volume Rendering parameters.
When the volume Render button is clicked and click event handler fired, volumeRenderThread starts and freezes the application even I have set its priority Lowest! I have also tried the lines which is commented. None of them works. What's the point I'm missing?? Thanks for answers from now!!

解决方案

Your thread is invoked on a method that immediately jumps back onto the UI thread.

In other words, it has one action: tell the UI Thread to do the work.

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