createwindow(...)之后，如何给窗口赋予颜色？

Question

我创建了一个窗口，其句柄是handle_parent。然后我创建了一个子窗口，如下所示：

hwnd_child = CreateWindow(child_class_name, _T(""),
WS_CHILDWINDOW, 0, 0, 0, 0, hwnd_parent, (HMENU)0, ghinst, NULL);
ShowWindow(win->hwndSplitterBar, SW_SHOW);
UpdateWindow(win->hwndSplitterBar);

我想设置子窗口“child”的颜色。如果我什么都不做，默认颜色是灰色的。我怎样才能设置它的颜色？我想永久保持黑色，无论如何都要改变。

Answer 1

创建所需颜色的画笔，然后在调用注册窗口类时将其传递到结构hbrBackground成员中。WNDCLASSRegisterClass

当你调用时系统会自动删除这个画笔UnregisterClass，所以一旦你把这个画笔传递给RegisterClass你，你就可以忘记它，并且不要尝试自己删除它。

Answer 2

这个例子可能会有所帮助：

//Setting the background color of a window during window class registration
WNDCLASS wc = { 0 } ( or WNDCLASS wc; memset(&wc, 0, sizeof(wc)); )
...
...
...
wc.hbrBackground = CreateSolidBrush(0x000000ff); // a red window class background
...
...
RegisterClass(&wc);

// Setting the background during WM_ERASEBKGND
LRESULT CALLBACK YourWndProc(HWND hwnd, UINT umsg, WPARAM,LPARAM)
{
   switch( umsg )
   {
      case WM_ERASEBKGND:
      {
         RECT rc;
         GetClientRect(hwnd, &rc);
         SetBkColor((HDC)wParam, 0x000000ff); // red
         ExtTextOut((HDC)wParam, 0, 0, ETO_OPAQUE, &rc, 0, 0, 0);
         return 1;
      }
      // or in WM_PAINT
      case WM_PAINT:
      {
         PAINTSTRUCT ps;
         RECT rc;
         HDC hdc = BeginPaint(hwnd, &ps);
         GetClientRect(hwnd, &rc);
         SetBkColor(hdc, 0x000000ff); // red
         ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rc, 0, 0, 0);
         EndPaint(hwnd, &ps);
         break;
      }
      ...
      ...
      ...
      default:
         return DefWindowProc(...);
   }
   return 0;
}