Slightly better error handling during effect initialization

It at least detects load failures now.  ;-)

src/effects/Effect.cpp

@@ -67,65 +67,6 @@ wxString Effect::StripAmpersand(const wxString& str)
 
 // Legacy (or full blown effect)
 Effect::Effect()
-{
-   CommonInit();
-}
-
-// Effect hosting an effect client
-Effect::Effect(EffectClientInterface *client)
-{
-   CommonInit();
-
-   mClient = client;
-   mClient->SetHost(this);
-   mClient->Startup();
-
-   mNumAudioIn = mClient->GetAudioInCount();
-   mNumAudioOut = mClient->GetAudioOutCount();
-
-   mInBuffer = NULL;
-   mOutBuffer = NULL;
-   mInBufPos = NULL;
-   mOutBufPos = NULL;
-
-   mBufferSize = 0;
-   mBlockSize = 0;
-   mNumChannels = 0;
-
-   int flags = PLUGIN_EFFECT;
-   switch (mClient->GetType())
-   {
-      case EffectTypeGenerate:
-         flags |= INSERT_EFFECT;
-      break;
-
-      case EffectTypeProcess:
-         flags |= PROCESS_EFFECT;
-      break;
-
-      case EffectTypeAnalyze:
-         flags |= INSERT_EFFECT;
-      break;
-   }
-
-   SetEffectFlags(flags);
-}
-
-Effect::~Effect()
-{
-   if (mClient)
-   {
-      mClient->Shutdown();
-      delete mClient;
-   }
-
-   if (mWarper != NULL)
-   {
-      delete mWarper;
-   }
-}
-
-void Effect::CommonInit()
 {
    mClient = NULL;
 
@@ -142,6 +83,31 @@ void Effect::CommonInit()
    // Can change effect flags later (this is the new way)
    // OR using the old way, over-ride GetEffectFlags().
    mFlags = BUILTIN_EFFECT | PROCESS_EFFECT | ADVANCED_EFFECT;
+
+   mNumAudioIn = 0;
+   mNumAudioOut = 0;
+
+   mInBuffer = NULL;
+   mOutBuffer = NULL;
+   mInBufPos = NULL;
+   mOutBufPos = NULL;
+
+   mBufferSize = 0;
+   mBlockSize = 0;
+   mNumChannels = 0;
+}
+
+Effect::~Effect()
+{
+   if (mClient)
+   {
+      mClient->Shutdown();
+   }
+
+   if (mWarper != NULL)
+   {
+      delete mWarper;
+   }
 }
 
 // EffectIdentInterface implementation
@@ -416,6 +382,42 @@ bool Effect::SetPrivateConfig(const wxString & group, const wxString & key, cons
 
 // Effect implementation
 
+bool Effect::Startup(EffectClientInterface *client)
+{
+   // Need to set host now so client startup can use our services
+   client->SetHost(this);
+   
+   // Bail if the client startup fails
+   if (!client->Startup())
+   {
+      return false;
+   }
+
+   // Let destructor know we need to be shutdown
+   mClient = client;
+
+   mNumAudioIn = mClient->GetAudioInCount();
+   mNumAudioOut = mClient->GetAudioOutCount();
+
+   int flags = PLUGIN_EFFECT;
+   switch (mClient->GetType())
+   {
+      case EffectTypeGenerate:
+         flags |= INSERT_EFFECT;
+      break;
+
+      case EffectTypeProcess:
+         flags |= PROCESS_EFFECT;
+      break;
+
+      case EffectTypeAnalyze:
+         flags |= INSERT_EFFECT;
+      break;
+   }
+
+   SetEffectFlags(flags);
+}
+
 // All legacy effects should have this overridden
 wxString Effect::GetEffectName()
 {

src/effects/Effect.h

@@ -74,7 +74,6 @@ class AUDACITY_DLL_API Effect : public EffectHostInterface
    // The constructor is called once by each subclass at the beginning of the program.
    // Avoid allocating memory or doing time-consuming processing here.
    Effect();
-   Effect(EffectClientInterface *client);
    virtual ~Effect();
 
    // IdentInterface implementation
@@ -131,6 +130,7 @@ class AUDACITY_DLL_API Effect : public EffectHostInterface
    virtual bool SetPrivateConfig(const wxString & group, const wxString & key, const sampleCount & value);
 
    // Effect implementation
+   virtual bool Startup(EffectClientInterface *client);
 
    // Each subclass of Effect should override this method.
    // This name will go in the menu bar;

src/effects/EffectManager.cpp

@@ -9,6 +9,7 @@
 
 **********************************************************************/
 
+#include <wx/msgdlg.h>
 #include <wx/stopwatch.h>
 #include <wx/tokenzr.h>
 
@@ -633,20 +634,26 @@ Effect *EffectManager::GetEffect(const PluginID & ID)
    // TODO: This is temporary and should be redone when all effects are converted
    if (mEffectPlugins.Index(wxString(ID)) == wxNOT_FOUND)
    {
-      // This will instantiate the effect client if it hasn't already been done
-      EffectClientInterface *client = static_cast<EffectClientInterface *>(PluginManager::Get().GetInstance(ID));
-      if (client)
+      effect = new Effect();
+      if (effect)
       {
-         effect = new Effect(client);
-         if (effect)
+         // This will instantiate the effect client if it hasn't already been done
+         EffectClientInterface *client = static_cast<EffectClientInterface *>(PluginManager::Get().GetInstance(ID));
+         if (client && effect->Startup(client))
          {
             effect->SetEffectID(mNumEffects++);
             PluginManager::Get().SetInstance(ID, effect);
             mEffectPlugins.Add(ID);
+            return effect;
          }
 
-         return effect;
+         delete effect;
       }
+
+      wxMessageBox(wxString::Format(_("Attempting to initialize the following effect failed:\n\n%s\n\nMore information may be available in Help->Show Log"),
+                                    PluginManager::Get().GetName(ID)),
+                   _("Effect failed to initialize"));
+
       return NULL;
    }