Cleaned up CA exceptions. Integrated free-standing handle class.

installer/src/installer-lib/process.cpp

 #include <stdexcept>
 #include <functional>
 #include <wctype.h>
 // <thread> is C++11, but implemented in VS2012
 #include <thread>
 
+#include "installer-lib.h"
 #include "process.h"
 
 //-------------------------------------------------------
-// Windows_Handle
-//-------------------------------------------------------
-Windows_Handle::Windows_Handle( HANDLE h ) 
-  : handle( h ) 
-{
-  validate_handle() ;
-}
-
-Windows_Handle::~Windows_Handle()
-{
-  CloseHandle( handle ) ;
-}
-
-void Windows_Handle::operator=( HANDLE h )
-{
-  this -> ~Windows_Handle() ;
-  handle = h ;
-  validate_handle() ;
-}
-
-void Windows_Handle::validate_handle()
-{
-  if ( handle == INVALID_HANDLE_VALUE )
-  {
-    throw std::runtime_error( "Invalid handle" ) ;
-  }
-}
-
-//-------------------------------------------------------
 // process_by_name_CI
 //-------------------------------------------------------
 process_by_name_CI::process_by_name_CI( const wchar_t * name )
   : name( name ), length( wcslen( name ) )
 {}
 
 bool process_by_name_CI::operator()( const PROCESSENTRY32W & process )
 {
   return 0 == wcsncmpi( process.szExeFile, name, length ) ;
 }
@@ skipping 75 matching lines @@
 // creator_process
 //-------------------------------------------------------
 DWORD creator_process( HWND window )
 {
   DWORD pid ;
   DWORD r = GetWindowThreadProcessId( window, & pid ) ;
   if ( r == 0 )
   {
     // Assert GetWindowThreadProcessId returned an error
     // If the window handle is invalid, we end up here.
-    throw std::runtime_error( "" ) ;
+    throw windows_api_error( "GetWindowThreadProcessId", r ) ;
   }
   return pid ;
 }
 
 //-------------------------------------------------------
 // Snapshot
 //-------------------------------------------------------
 Snapshot::Snapshot()
   : handle( ::CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 ) )
 {
@@ skipping 262 matching lines @@
       if ( ! is_running() )
       {
         return true ;
       }
     }
     // Assert is_running()
   }
   // No control path leaves the for-loop.
 } ;