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[SVN error] How to resolve a SVN conflict

Assuming your working copy of the conflicted file is the one you wish to keep (i.e. by committing it). Resolve the conflict using the following command

svn resolve --accept=working -R .

on your working copy of the file. Note that the -R option will look recursively for conflicted files and accept yours starting from the current (.) directory.

[SVN error] How to solve the error: “Project : error PRJ0003 : Error spawning ‘cmd.exe’.”

Assuming you use Windows, set your environment variables (Start > Control Panel > System : Advanced tab; click Environment Variables) to use %SystemRoot% instead of explicit paths (say, C:\Windows), MSVS 2005 does not understand %SystemRoot% or it resets its entries… …or both. Don’t just believe what the list box says; Edit the item and you’ll see the differences. What you must do is change MSVS 2005 options (Tools menu > Options > Project and Solutions > VC++ Directories) to ensure that

$(SystemRoot) $(SystemRoot)\System32 $(SystemRoot)\System32\wbem

are specified BEFORE $(PATH). Setting your system’s environment variables to use $(SystemRoot) rather than %SystemRoot% (indeed, even using %SystemRoot%) is not a good idea: too much (MSVS 2005 as well as other applications) seems to break.

[SVN error] How to solve the error: “An obstructing working copy was found”

If you get a message such as:

Skipped 'camitk/tools/mml/test' -- An obstructing working copy was found


Skipped 'camitk/components/dicom/testdata' -- An obstructing working copy was found

this is due to a change of the corresponding directory/ies on the svn repository.

To fix this problem, you have two choices: either do a svn checkout somewhere else to get a fresh/error free working copy and stop using the offending working copy, or you can try the following (which can take a while):

  1. delete your local copy of the obstructing directory (e.g., remove your local camitk/tools/mml/test and camitk/components/dicom/testdata directories)
  2. do a svn cleanup on the top-level
  3. do a svn update
  4. repeat cleanup/update until all error messages disappear

(tip: if you have a bash shell, you can try directly for (( i=1; i \<= 50; i++ )); do svn cleanup; svn update; done

Configuring / CMaking

[KDevelop Error] Kdevelop 4.3 crash when you try to import CamiTK project (Ubuntu 12.04)

With some configuration, KDevelop seems to crash because the parser failed to read the CMakeList when you try to import the project in. The first thing to do is to check if you can obtain a version of KDevelop in the package manager of your Linux distribution.

If this solution failed or is not possible, a second trick is to download and compile sources of a trustable KDevelop and Kdevplatform. For example, in case of Ubuntu 12.04, KDevelop 4.4.1 for Ubuntu 12.10 seems to work. Go to to the KDevelop website, download sources and follow these helpful instructions ! Assuming this stage success, you will be able to import CamiTK project in KDevelop.

[CMake error][Visual Studio 10 Win64] The C compiler identification is unknown

Your installation of the Windows 7.1 SDK on Visual Studio 2010 is broken since you (or your computer in your back) have installed the 7.1 SDK SP1, which breaks up the x64 compiler. Solution: Download and install this patch for Windows 7.1 SDK x64 compiler, click download and select VC-Compiler-KB2519277.exe


How to handle several components within only one component extension

You have created a component extension ‘MyComponentExtension’ with serveral components : ‘MyComponent1’, ‘MyComponent2’. The CamiTK wizard asks you to select only one top level component.

It is strongly advised to have only one top level by component extension. The top-level component is instanciated in when opening a file corresponding to the managed extension.

How to manage data without a file

In CamiTK, Component are used to manage all the data. The manage a specific type of data you have to consider whether it is a generic type of data, a type of mesh or a type of image (and coming soon: a type of video camera, a type of pointer etc…). If your data type can be assimilate to static data, i.e., it can be instanciate/initialize from data coming from a file, the only thing you have to do is to create a new Component extension and in the extension class, just declare which file extension is used to load your data from a file.

However, sometimes you data are coming on the fly, or are acquired directly from a device or are “programmatically” generated (e.g., using a vtk*Source class), without having any initial static file to open.

In this case, there are two ways to load data in CamiTK without having to use any data file to start with:

  1. ) create an initializer action, or
  2. ) define a specific file type / model of the connection to your device (name, parameters of the connection, etc…)

Create an initializer action

This action is not specific to any component, i.e., that will be available at any time, even when no component are in memory. In this case you can trigger the action at any time in the Action menu of camitk-imp. This action should :

  • initialize the connection to a device, and
  • create an empty specific camitk::Component or initialize this component from the connection

The action

  • can have parameters that will be taken into account when the “apply” button is clicked (see SphereTopology in sdk/actions/mesh/basictopology for an example)
  • can have no parameters, in this case the apply() method is run immediately when the action is triggered (see CloseAction in sdk/actions/application)

Define a specific file type

This can help you generalize an acquisition device idea. You can define a specific component, e.g. FooComponent that would generalized the concept of FooDevice and have some parameters like name, connection parameters etc… define in a text/xml file. Then, you create a specific action for FooComponent to start the acquisition (or whatever you need to do to initialize the data or change it on the fly).

How to make Save As work on a Component which is neither an Image nor a Mesh

To use the “Save As…” action, CamiTK looks for the extension which creates your Component. If your SpecialComponent inherits from ImageComponent or MeshComponent, it will find any Component Extension saving an Image or a Mesh. However, if your SpecialComponent directly inherits from Component, the only way it has to find the appropriate Save method (in your Special Component Extension) is to look at the file extension of your SpecialComponent. So as soon as you create an instance of your SpecialComponent, you must give it a file name (using setFileName()), even if the corresponding file does not exist (e.g. if your created your SpecialComponent instance thanks to an action) with the proper extension so that “Save As…” action can find your SpecialComponentExtension to save it.

How to add a new class to a CamiTK project

You have added a class in your CamiTK project, and when compiling it, the class is forgotten by your IDE (no compilation). Simply run Cmake on your project to consider it. Once done, when recompiling your project, your class will be now examinated.

[Signal/Slots Explorer] How to detect modifications in Component explorer

As far as you work with several components, it could be interesting to catch some signals to hide or delete some objects you created in an action for one of the component to avoid unexpected behaviors.

Let us take a pratical example like developing an interactive vtkSeedWidget action in the viewers for an imageComponent. If you don’t catch signals, your seeds will stay in the viewers after the deletion of your component and finally it will crash because events in vtk pipeline will lost for your seeds. To manage this, you can use two signals which are selectionChanged() (provided by CamiTK) and destroyed(QObject*) (provided by Qt). The first one is sed to manage a change in viewers or explorer. With our example, it can be used to hide or screen our seeds. The second one is use to catch the deletion of your component. Here, the aim will be to delete seeds to free the memory. In the constructor, you can connect these methods with dedicated methods in your code.

// manage the slots
if (!isConnected) {
   QObject::connect(Explorer::getInstance(), SIGNAL(selectionChanged()), this, SLOT(XX()));
   QObject::connect(MyImgComponent, SIGNAL(destroyed(QObject*)), this, SLOT(YY(QObject*)));
   isConnected = true;

Don’t forget to also manage the disconnection of these methods.

[Action] How to create an action of actions

In the case you want use a series of CamiTK actions in one of your action before your algorithm, you should set to false the flag that inform your image has been modified. To do that, perform an action in your action, change the flag to false and perform your algorithm.

ImageComponent * input = dynamic_cast<ImageComponent *> (performLaplacianSharpeningAction(comp));
myAlgo (input->getImageData());


[Compilation error] VtkImageComponent.h: No such file or directory

This file has not been found because the projet ‘component-vtkimage’ installing the headers have not been built yet. It comes from a dependencies issue. The CamiTK team is working on it. To correctly compile your project, first build and install the target ‘component-vtkimage’ before yours.

[Compilation error] VtkMeshComponent.h: No such file or directory

This file has not been found because the projet ‘component-vtkmesh’ installing the headers have not been built yet. It comes from a dependencies issue. The CamiTK team is working on it. To correctly compile your project, first build and install the target ‘component-vtkmesh’ before yours.

[Compilation error] PMManagerDC.h: No such file or directory

This file has not been found because the projet ‘component-physicalmodel’ installing the headers have not been built yet. It comes from a dependencies issue. The CamiTK team is working on it. To correctly compile your project, first build and install the target ‘component-physicalmodel’ before yours.

[Compilation error] Error C2752 or/and C2528 on VS2010 when compiling modeling CEP

The problem comes from the additional templates that were added to Visual Studio 2010. To fix it, std::make_pair, which doesn’t always work has to be changed to pair\<>. Remplace in the file MMLMonitorDisplayFactory.h (lines 63 and 82).

     mapObjectCreator.insert( std::make_pair<std::string,CreateMonitorDisplayFunctionPointer>(id, &createTheMonitorDisplay<C> ) );


      mapObjectCreator.insert( std::pair<std::string,CreateMonitorDisplayFunctionPointer>(id, &createTheMonitorDisplay<C> ) );

[Linking error] Undefined reference to …

Typically this error occurs at the last stage of compilation : linkage. The linker checks that all entries points of your binaries that refers to external libraries are validated. You encounter this error when the linker cannot find some entries point (one per error) within the provided libraries at the link stage. Here are the solutions to this error, from the most encountered to the least:

  • You did not provide the good libraries for the linking. Check configuration to see if you are missing some libraries at the link stage.
  • You provide the good libraries but they have a different configuration that the binary you are compiling. Thus, mostly on Windows platform, binaries are not compatible from one compiler to one another. 32bits built libraries are not compatible with 64bits (and vice versa). For instance, Qt built libraries for VS 2010 are not compatible neither with VS 2008 nor VS 2012 (and surely not with MinGW). Check your libraries configuration remains the same for all your libraries.
  • You did provide all the good libraries with the good configuration, but in the wrong order. Indeed, this one is the trickiest: you must indicate which libraries to link with your executable / library you are compiling in the CORRECT ORDER. This order is from the most dependent to your target from the least. Thus, check your CMake configuration to verify that order. If it deals with CamiTK extensions / libraries or applications, please contact us by an issue

[Linking error] Unresolved symbol …

If you face to error like *unresolved external symbol "public: __cdecl* when you compile with Visual Studio, read this page: DLL import/export.

[Linking error] Relocation R_X86_64_32S against `.rodata’

This error comes when you tried to link static library on a 64 bits platform. The solution is to compile the libraries you are linking against as “shared”. To do so, simply reconfigure your shared lib with the build_shared_lib flag set to on and compile them.

For more information please read the topic on StackOverflow

[Install Local error] VS doesn’t find your CEP to perform a local install

Please verify that the name of your CEP has no space between words. For example, in VS2008, the local installation of “my CEP” will failed because VS2008 try to install “my” and “CEP”.


Why does my action do not apply to my custom component ?

When creating a new action you will certainly configure a custom component to apply your action on. Each CamiTK action works on a specified type of component. In the constructor of your custom action MyAction you will have to explicitly specify which component it works on, using setComponent() method, such as described in the example below :

MyAction::MyAction(ActionExtension * extension) : Action(extension) {
    // Setting name, description and input component
    setName("My Action name");
    setDescription("The action my component does");

MyComponentClassName should remain the exact class name of your custom component. Each time a new component of type MyComponentClassName would be instanciated in your program, all compatible actions would be automatically available in the action menu. In fact, if you look at the code of the apply() method of your custom action :

void MyCustomAction::apply() {
    foreach (Component *comp, targetComponents) {
        MyCustomComponent * input = dynamic_cast<MyCustomComponent *> ( comp );

The targetComponents member contains all the compatible components for this specified action.

Why does nothing appear in the IMP console ?

When running IMP the console is redirected as another output. If you wish to have the standard output using the system console when running IMP, simply add the flag -noConsole when running your application. For instance, on Visual Studio, right click on your project.

  1. select properties
  2. go to configuration properties > Debugging
  3. select the 2nd field command Arguments
  4. add the -noConsole flag to it.

Now the IMP console is redirected to your standard console.

Note : in Visual Studio you have 2 different configuration for Debug and Release launch of your application. Be sure to edit the ones you work with.

FYI : the 1st field Command refers to the command line launched when you run and instance of your project debugging. You can edit this line to run IMP for instance if you develop a custom extension for it.

Why am I getting the following error: \<The application was unable to start correctly (0xc000007b)> when I try to run my application?


This error likely comes from trying to run a 32 bit windows application on a 64 bit environment. The most effective solution is to download dependency walker and check if your application is calling any 64 bit dll libraries. If so, then replace these libraries with the corresponding 32 bit versions. See a detailed explanation.

An example of when this can occur is when you use libxml2 in your application. libxml2 depends on the zlib1.dll library which may already exist on your computer in the 64-bit version for another unrelated program (such as intel wifi, corel windvd, matlab, etc.). Your program may be linking to this dll, causing the above error message. The solution is to download the 32-bit zlib archive and to place the zlib1.dll in your libxml\bin directory, the zlib1.h file in your libxml\include directory and the zlib.lib file in your libxml\lib directory.

Other case : If it crash when you run debug version only, it may comes from a bad ucrtbased.dll version. Try to copy ucrtbased.dll x64 version from Windows Kits\10\bin\ucrtbased.dll to system32 to replace the bad one. Or do what its better with file moving for get it working (ie add this file to your path prior the old one for example).

It does not wok

-> clean your build -> run CMake -> build your project -> run camitk-imp from your build directory

Cannot find my new Cpp file in my IDE

-> run CMake

"Could not connect slot to signal"

-> add Q_OBJECT just after the declaration of your class -> re-run CMake
-> Add an API file (dll_spec import, etc.) in reused Components or Actions Extensions -> CMake -> Rebuild -> Re-run