[vtkusers] QVTK and vtkStreamingDemandDrivenPipeline (0487BC08) and Win32OpenGLWindow errors

[Clinton Stimpson]

I don't see where you are calling either
imgview->SetRenderWindow(vtkwidget->GetRenderWindow())
or
vtkwidget->SetRenderWindow(imgview->GetRenderWindow())

They need to share the window, otherwise you'll get an extra pop-up window.
Maybe that'll also fix your pipeline issues where you're doing a render 
with incomplete pipeline connections.

Clint

Ashish Singh wrote:
> Hi,
>
> I am trying to display each slice from a series of CT scans in a 
> QVTKwidget. The QVTKWidget itself is in a QMainWindow with 2 other 
> widgets to browse and load the data and a slider to view each slice. I 
> want to be able to display the data in QVTKwidget as soon as I hit the 
> load button and use a slider to display every slice from the series. I 
> am facing two problems with my application.
>
> (1) when I run the application I get a bunch of errors that open in a 
> new vtkOutputWindow. How do I eliminate these? The errors that I get 
> are as follows:
> -----
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Rendering\vtkImageActor.cxx, line 267
> vtkOpenGLImageActor (0487A430): This filter requires unsigned char 
> scalars as input
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional.
>
> ERROR: In ..\..\vtk-5.2.1\Filtering\vtkDemandDrivenPipeline.cxx, line 725
> vtkStreamingDemandDrivenPipeline (0487BC08): Input port 0 of algorithm 
> vtkImageMapToWindowLevelColors(0487AA68) has 0 connections but is not 
> optional
> ERROR: In ..\..\vtk-5.2.1\Rendering\vtkImageActor.cxx, line 267
> vtkOpenGLImageActor (0487A430): This filter requires unsigned char 
> scalars as input
>
> ---------
>
> (2)My application windows also opens up and I can load the data fine. 
> But when I use the slider, it opens up a new Win32OpenGLWindow and 
> displays each slice in this window instead of my QVTKWidget window.
>
> Can anyone please guide me on solving these 2 errors? I will really 
> appreciate all assistance with this.
>
> Thanks,
> Ashish
>
> Here's my code:
> ------header file----
> #include <QObject>
> #include <QPushButton>
> #include <QLabel>
> #include <QHBoxLayout>
> #include <QVBoxLayout>
> #include <QMainWindow>
> #include <QVTKWidget.h>
> #include <QWidget>
> #include <QString>
> #include <QFileDialog>
> #include <QDir>
> #include <qapplication.h>
> #include <qobject.h>
> #include <QtGui>
> #include <QSlider>
>
> #include <vtkDICOMImageReader.h>
> #include <vtkImageViewer2.h>
> #include <vtkRenderWindow.h>
> #include "vtkRenderer.h"
>
> using namespace std;
>
> class test : public QObject
> {
>     Q_OBJECT
>
> public:
>     string dirname;
>     vtkDICOMImageReader *reader;
>     vtkImageViewer2 *imgview;
>
>     QMainWindow *mymainwindow;
>     QWidget *centralwidget;
>     QLabel *mylabel;
>     QPushButton *mypbutton;
>     QPushButton *myloadbutton;
>     QSlider *slider1;
>     QVTKWidget *vtkwidget;
>     QHBoxLayout *myhlayout;
>     QVBoxLayout *myvlayout;
>     test(QObject* parent = 0);
>     ~test();
>
>
>     public slots:
>         void OnLoad();
>         void OnBrowse();
>         void OnSlide(int);
>
> };
> ------cpp file------
> #include "test.h"
> test::test(QObject * parent):QObject(parent)
> {
>     reader = vtkDICOMImageReader::New();
>     imgview = vtkImageViewer2::New();
>
>     mymainwindow = new QMainWindow();
>     centralwidget = new QWidget(mymainwindow);
>
>     mylabel = new QLabel(centralwidget);
>     mypbutton = new QPushButton(centralwidget);
>     myloadbutton = new QPushButton(centralwidget);
>     slider1 = new QSlider(Qt::Horizontal,centralwidget);
>
>     vtkwidget = new QVTKWidget(centralwidget);
>     vtkwidget->GetRenderWindow()->AddRenderer(imgview->GetRenderer());
>     vtkwidget->setFixedSize(512,512);
>
>     myhlayout = new QHBoxLayout();
>     myvlayout = new QVBoxLayout();
>
>     //setup UI
>     mylabel->setText("Select Dicom Dir");
>     mypbutton->setText("Browse");
>     this->connect(this->mypbutton,SIGNAL(clicked()),this, 
> SLOT(OnBrowse()));
>
>     myloadbutton->setText("Load");
>     this->connect(this->mypbutton,SIGNAL(clicked()),this, SLOT(OnLoad()));
>
>    
> this->connect(this->slider1,SIGNAL(valueChanged(int)),this,SLOT(OnSlide(int)));
>
>     myhlayout->addWidget(mylabel);
>     myhlayout->addWidget(mypbutton);
>     myhlayout->addWidget(myloadbutton);
>
>     myvlayout->addLayout(myhlayout);
>     myvlayout->addWidget(vtkwidget);
>     myvlayout->addWidget(slider1);
>
>     centralwidget->setLayout(myvlayout);
>     mymainwindow->setCentralWidget(centralwidget);
>     mymainwindow->show();
> }
>
> test::~test()
> {
>     reader->Delete();
>     imgview->Delete();
> }
>
> void test::OnLoad()
> {
>     reader->SetDirectoryName(dirname.c_str());
>     reader->Update();
>
>     imgview->SetInput(reader->GetOutput());
>     imgview->GetRenderer()->ResetCamera();
>     vtkwidget->update();
>
> }
>
> void test::OnSlide(int value)
> {
>     
> this->slider1->setRange(this->imgview->GetSliceMin(),this->imgview->GetSliceMax());
>     imgview->SetSlice(value);
>
> }
>
> void test::OnBrowse()
> {
>     QString indirectory = 
> QFileDialog::getExistingDirectory(this->centralwidget,tr("Select Input 
> Directory"), QDir::currentPath());
>     dirname = indirectory.toStdString();
>
> }
> ------main.cpp---------
> #include "test.h"
> void main(int argc, char *argv[])
> {
>     QApplication app(argc, argv);
>     test *mywin = new test;
>     app.exec();
>
> }
>
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