Add exit codes

EXIT_CODE_NORMAL_EXIT will be returned when the process exits normally.
EXIT_CODE_ERROR will be used if the process exits due to an error.

Author: derceg

Explorer++/Explorer++/Explorer++_internal.h

@@ -56,6 +56,12 @@ struct ColumnWidth
 	int iWidth;
 };
 
+enum ExitCode
+{
+	EXIT_CODE_NORMAL_EXIT = 0,
+	EXIT_CODE_ERROR = 1
+};
+
 extern HACCEL g_hAccl;
 
 BOOL TestConfigFileInternal(void);

Explorer++/Explorer++/MainWndSwitch.cpp

@@ -61,7 +61,7 @@ LRESULT CALLBACK Explorerplusplus::WndProcStub(HWND hwnd, UINT msg, WPARAM wPara
 
 		if (!pContainer)
 		{
-			PostQuitMessage(0);
+			PostQuitMessage(EXIT_CODE_ERROR);
 			return 0;
 		}
 
@@ -72,7 +72,7 @@ LRESULT CALLBACK Explorerplusplus::WndProcStub(HWND hwnd, UINT msg, WPARAM wPara
 	case WM_NCDESTROY:
 		SetWindowLongPtr(hwnd, GWLP_USERDATA, 0);
 		delete pContainer;
-		PostQuitMessage(0);
+		PostQuitMessage(EXIT_CODE_NORMAL_EXIT);
 		break;
 	}
 

Explorer++/Explorer++/WinMain.cpp

@@ -98,7 +98,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 
 	if (status != Gdiplus::Status::Ok)
 	{
-		return 0;
+		return EXIT_CODE_ERROR;
 	}
 
 	auto gdiplusCleanup = wil::scope_exit(
@@ -213,7 +213,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 
 	if (shouldExit)
 	{
-		return 0;
+		return EXIT_CODE_NORMAL_EXIT;
 	}
 
 	BOOL bAllowMultipleInstances = TRUE;
@@ -272,7 +272,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 
 				SetForegroundWindow(hPrev);
 				ShowWindow(hPrev, SW_RESTORE);
-				return 0;
+				return EXIT_CODE_NORMAL_EXIT;
 			}
 		}
 	}
@@ -287,7 +287,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		MessageBox(nullptr, _T("Could not register class"), NExplorerplusplus::APP_NAME,
 			MB_OK | MB_ICONERROR);
 
-		return 0;
+		return EXIT_CODE_ERROR;
 	}
 
 	InitializeCrashHandler();
@@ -307,7 +307,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		MessageBox(nullptr, _T("Could not create main window."), NExplorerplusplus::APP_NAME,
 			MB_OK | MB_ICONERROR);
 
-		return 0;
+		return EXIT_CODE_ERROR;
 	}
 
 	WINDOWPLACEMENT wndpl;