Send debug output to a file

src/engine/Debug.cpp

Index: src/engine/Debug.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/src/engine/Debug.cpp
@@ -0,0 +1,77 @@
+#include "stdafx.h"
+
+#include <fstream>
+#include <stdio.h>
+
+#include "Debug.h"
+#include "Utils.h"
+
+#ifdef _DEBUG

[Felix Dahlke, 2013/06/04 06:57:58]

I assume this is something defined in the plugin?

Just for the record, identifiers beginning with _ are reserved for the
implementation (i.e. compiler and standard library), and we should get rid of
them at some point. But I'm happy with not adding new ones for now.

[Wladimir Palant, 2013/06/04 09:33:59]

No, this is defined by the compiler.

[Felix Dahlke, 2013/06/04 09:39:09]

Hm, didn't know that one, seems to be MSVS only. But well, we can fix that if it
becomes a problem.

+
+namespace
+{
+  class CriticalSection
+  {
+  public:
+    CriticalSection()
+    {
+      InitializeCriticalSection(&section);
+    }
+
+    ~CriticalSection()

[Felix Dahlke, 2013/06/04 06:57:58]

Rule of Three again :P I suggest making copy constructor and copy assignment
operator private. This is going to crash when copied otherwise.

+    {
+      DeleteCriticalSection(&section);
+    }
+
+    class Lock
+    {
+    public:
+      Lock(CriticalSection& cs)
+          : section(&cs.section)
+      {
+        EnterCriticalSection(section);
+      }
+
+      ~Lock()

[Felix Dahlke, 2013/06/04 06:57:58]

Same as above, should have a private copy constructor and copy assignment
operator.

+      {
+        LeaveCriticalSection(section);
+      }
+    private:
+      LPCRITICAL_SECTION section;
+    };
+  private:
+    CRITICAL_SECTION section;
+  };
+
+  static CriticalSection debugLock;

[Felix Dahlke, 2013/06/04 06:57:58]

static in namespaces is deprecated in C++. Don't think it has any effect anyway.

+}
+
+void Debug(const std::string& text)
+{
+  SYSTEMTIME st;
+  ::GetSystemTime(&st);
+
+  char timeBuf[14];
+  _snprintf_s(timeBuf, _TRUNCATE, "%02i:%02i:%02i.%03i", st.wHour, st.wMinute, st.wSecond, st.wMilliseconds);
+
+  std::wstring filePath = GetAppDataPath() + L"\\debug_engine.txt";
+
+  CriticalSection::Lock lock(debugLock);
+  std::ofstream out(filePath, std::ios::app);
+  out << timeBuf << " - " << text << std::endl;
+  out.flush();
+}
+
+void DebugLastError(const std::string& message)
+{
+  std::stringstream stream;
+  stream << message << " (Error code: " << GetLastError() << ")";
+  Debug(stream.str());
+}
+
+void DebugException(const std::exception& exception)
+{
+  Debug(std::string("An exception occurred: ") + exception.what());
+}
+
+#endif // _DEBUG