如何以编程方式设置静态控件背景颜色

我想更改函数内的标签背景颜色，我尝试了这段代码，但调用后没有任何变化changecolor功能

HWND hWndLabel;

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        hWndLabel = CreateWindowEx(WS_EX_TRANSPARENT,
            L"STATIC", L"", WS_CHILD | WS_VISIBLE | SS_LEFT | WS_SYSMENU,
            75, 75, 70, 70, hWnd, (HMENU)labelId, hInst, NULL);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    case WM_COMMAND:  // all events are handled here
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }
    return 0;
}

DWORD WINAPI changecolor(){
    HDC hdc = GetDC(hWndLabel); // get context
    SetBkColor(hdc, RGB(0, 0, 230)); // Code Copied from the above answer by cpx.
    return 0;
}

我读到静态控件向其父级发送WM_CTLCOLORSTATIC在他们画自己之前的消息。代码是在CALLBACK函数，但是这段代码在哪里被调用（改变颜色）？我该如何调用SetTextColor在函数内

代码示例：

case WM_CTLCOLORSTATIC:
  if (the_button_was_clicked) {
    HDC hdc = reinterpret_cast<HDC>(wParam);
    SetTextColor(hdc, COLORREF(0xFF, 0x00, 0x00));
  }
  return ::GetSysColorBrush(COLOR_WINDOW);  // example color, adjust for your circumstance

尝试更多类似这样的事情：

HWND hWndLabel;
HBRUSH hBrushLabel;
COLORREF clrLabelText;
COLORREF clrLabelBkGnd;

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        hWndLabel = CreateWindowEx(0, L"STATIC", L"", WS_CHILD | WS_VISIBLE | SS_LEFT,
            75, 75, 70, 70, hWnd, (HMENU)labelId, hInst, NULL);
        hBrushLabel = NULL;
        clrLabelText = GetSysColor(COLOR_WINDOWTEXT);
        clrLabelBkGnd = GetSysColor(COLOR_WINDOW);
        break;

    case WM_DESTROY:
        if (hBrushLabel) DeleteObject(hBrushLabel);
        PostQuitMessage(0);
        break;

    case WM_CTLCOLORSTATIC: {
        HDC hdc = reinterpret_cast<HDC>(wParam);
        SetTextColor(hdc, clrLabelText);
        SetBkColor(hdc, clrLabelBkGnd);
        if (!hBrushLabel) hBrushLabel = CreateSolidBrush(clrLabelBkGnd);
        return reinterpret_cast<LRESULT>(hBrushLabel);
    }

    case WM_COMMAND:  // all events are handled here
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
        break;
    }
    return 0;
}

DWORD WINAPI changecolor()
{
    if (hBrushLabel) {
        DeleteObject(hBrushLabel);
        hBrushLabel = NULL;
    }
    clrLabelText = RGB(0xFF, 0x00, 0x00);
    clrLabelBkGnd = RGB(0, 0, 230);
    InvalidateRect(hWndLabel, NULL, TRUE);
    return 0;
}

中也有一个类似的例子WM_CTLCOLORSTATIC文档 https://msdn.microsoft.com/en-us/library/windows/desktop/bb787524.aspx.

下面的 C++ 示例演示如何设置静态控件的文本前景色和背景色以响应 WM_CTLCOLORSTATIC 消息。 hbrBkgnd 变量是一个静态 HBRUSH 变量，初始化为 NULL，并在调用 WM_CTLCOLORSTATIC 之间存储背景画笔。当不再需要画笔时，通常是在关联的对话框被销毁时，必须通过调用 DeleteObject 函数来销毁画笔。

case WM_CTLCOLORSTATIC:
    {
    HDC hdcStatic = (HDC) wParam;
    SetTextColor(hdcStatic, RGB(255,255,255));
    SetBkColor(hdcStatic, RGB(0,0,0));

    if (hbrBkgnd == NULL)
    {
        hbrBkgnd = CreateSolidBrush(RGB(0,0,0));
    }
    return (INT_PTR)hbrBkgnd;
    }