SendMessage from CScrollView to CFormView

When your form view is trying to sent a message to your scroll view, it is likely that form view is the active view - which is why your message is going to the wrong place.

I did an app that used lots of views - sometimes in a splitter, sometimes not. If your app is going to become more complex, you might want to consider the approach I used. I created some mix-in classes for the splitter and view classes. The views would then use my "SendToParentWindow" function. If the parent was a splitter, it would then forward the message to its other children. This way, the view didn't have to care where in a splitter it was - or even if it was in a splitter. This allowed me to reuse the same view classes in different situations.

Here would be a possible way
to iterate all opened documents views (in your case one view) :) :

void CMainFrame::SendStringToOpenedView(const CString& cszMessage)
{
  CWinApp* pcApp = AfxGetApp();
  if (pcApp) {
    POSITION pos = pcApp->GetFirstDocTemplatePosition();
    while (pos) {
      CDocTemplate* pcTemplate = pcApp->GetNextDocTemplate(pos);
      if (pcTemplate) {
        POSITION posDoc = pcTemplate->GetFirstDocPosition();
        while (posDoc) {
          CDocument* pcDoc = pcTemplate->GetNextDoc(posDoc);
          if (pcDoc) {
            POSITION posView = pcDoc->GetFirstViewPosition();
            while (posView) {
              CYourView* pcView = DYNAMIC_DOWNCAST(CYourView, pcDoc->GetNextView(posView));
              if (pcView->GetSafeHwnd()) {
                pcView->TakeString(cszMessage); // :)
              }
            }
          }
        }
      }
    }
  }
}