实现 WndProc 主窗口消息处理逻辑 完成函数4

src/source/Tetris.cpp

@@ -104,7 +104,41 @@ BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
     // TODO(作业4): 补全主窗口消息处理函数。
-    return DefWindowProc(hWnd, message, wParam, lParam);
+    switch (message)
+    {
+    case WM_COMMAND:
+    {
+        int wmId = LOWORD(wParam);
+
+        switch (wmId)
+        {
+        case IDM_ABOUT:
+            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
+            break;
+        case IDM_EXIT:
+            DestroyWindow(hWnd);
+            break;
+        default:
+            return DefWindowProc(hWnd, message, wParam, lParam);
+        }
+    }
+    break;
+    case WM_PAINT:
+    {
+        PAINTSTRUCT ps;
+        HDC hdc = BeginPaint(hWnd, &ps);
+        TDrawScreen(hdc, hWnd);
+        EndPaint(hWnd, &ps);
+    }
+    break;
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        break;
+    default:
+        return DefWindowProc(hWnd, message, wParam, lParam);
+    }
+
+    return 0;
 }
 
 INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)