c++ - 在 RichEdit winapi 中隐藏插入符号

Question

我想在指定了 ES_READONLY 样式的 RichEdit(50W) 中隐藏插入符号。当插入符闪烁且用户无法输入时，这对用户来说非常困惑。
我试图使用 HideCaret() 隐藏插入符号功能，
但是它不适用于以下代码:

LRESULT CALLBACK ChatMessaegsSubclassProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) // Subclassed control
{
    LRESULT ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
    switch(msg)
    {
    //Also tried with EN_SETFOCUS
    case WM_SETFOCUS:
    {
        ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
        HideCaret(ChatMessages); //Returns 5 (Access denied.)
        break;
    }

    //According the documentation:
    //If your application calls HideCaret five times in a row, 
    //it must also call ShowCaret five times before the caret is displayed.
    case WM_KILLFOCUS: //The message is called when the RichEdit get focus, however nothing happens.
    {
        ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
        ShowCaret(ChatMessages);
        break;
    }
    }
    return ret;
}

Answer 1

解决方法如下:

LRESULT CALLBACK ChatMessaegsSubclassProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    LRESULT ret = CallWindowProc(WndProc_ChatMessages, hwnd, msg, wParam, lParam);
    switch(msg)
    {
    case WM_LBUTTONDOWN:
    {
        HideCaret(ChatMessages);
        break;
    }
    case WM_KILLFOCUS:
    {
        ShowCaret(ChatMessages);
        break;
    }
    }
    return ret;
}

注意 这仅在用户使用鼠标引导焦点时有效。因此，如果有人知道如何正确处理它，请随时回答，我会很高兴。