如何在C++ Win32图形用户界面中设置文本框的默认背景(灰显)文本？

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
    {
        // 创建文本框控件
        HWND hTextBox = CreateWindowEx(WS_EX_CLIENTEDGE, L"EDIT", L"请输入文本", WS_CHILD | WS_VISIBLE | ES_AUTOHSCROLL, 10, 10, 200, 20, hWnd, NULL, NULL, NULL);

        // 设置默认背景文本
        SendMessage(hTextBox, WM_SETTEXT, NULL, (LPARAM)L"请输入文本");

        break;
    }
    case WM_CTLCOLORSTATIC:
    {
        // 设置文本颜色
        HDC hdcStatic = (HDC)wParam;
        SetTextColor(hdcStatic, RGB(128, 128, 128)); // 灰色
        SetBkMode(hdcStatic, TRANSPARENT); // 透明背景
        return (LRESULT)GetStockObject(NULL_BRUSH);
    }
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    // 注册窗口类
    WNDCLASSEX wcex;
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc = WndProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = L"MainWindow";
    wcex.hIconSm = LoadIcon(wcex.hInstance, IDI_APPLICATION);

    if (!RegisterClassEx(&wcex))
    {
        MessageBox(NULL, L"窗口类注册失败！", L"错误", MB_ICONERROR);
        return 1;
    }

    // 创建主窗口
    HWND hWnd = CreateWindow(L"MainWindow", L"文本框示例", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 300, 200, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        MessageBox(NULL, L"窗口创建失败！", L"错误", MB_ICONERROR);
        return 1;
    }

    // 显示主窗口
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    // 消息循环
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;
}