ENH: add otput pixel type get accessor

Code/ApplicationEngine/otbWrapperApplication.cxx

@@ -699,6 +699,21 @@ std::string Application::GetParameterAsString(std::string paramKey)
   return ret;
 }
 
+ImagePixelType Application::GetParameterOutputImagePixelType(std::string parameter)
+{
+  Parameter* param = GetParameterByKey(parameter);
+  ImagePixelType ret;
+
+  if (dynamic_cast<OutputImageParameter*>(param))
+    {
+    OutputImageParameter* paramDown = dynamic_cast<OutputImageParameter*>(param);
+    ret = paramDown->GetPixelType();
+    }
+
+  //TODO: exception if not found ?
+  return ret;
+}
+
 void
 Application::AddChoice(std::string paramKey, std::string paramName)
 {

Code/ApplicationEngine/otbWrapperApplication.h

@@ -318,6 +318,13 @@ public:
    */
   std::vector<std::string> GetParametersKeys(bool recursive = true);
 
+  /* Get the pixel type in which the image will be saved
+   *
+   * Can be called for types :
+   * \li ParameterType_OutputImage
+   */
+  ImagePixelType GetParameterOutputImagePixelType(std::string parameter);
+
   itk::Logger* GetLogger();
 
   void AddProcess(itk::ProcessObject* object, std::string description);