C++ Switch语句中未初始化的局部变量-Win32 API

好的，这是我的代码，我只提供一个函数，其他的都没有帮助。我一直在寻找这个问题，似乎无法解决

错误：未初始化的局部变量“hTextBox”使用了Win32Project2

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它不是静态的，所以它不会记得在WM_CREATE中发生了什么

谢谢：D，那个家伙从来没有提到过，所以我不知道。

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
    HDC hdc;
    RECT rect;
    PAINTSTRUCT ps;
    HWND hTextBox;

    switch (message)
    {

        case WM_CREATE:
            hTextBox = CreateWindow(L"edit", L"", WS_CHILD|WS_VISIBLE|WS_BORDER, 5, 5, 200, 25, hwnd, NULL, NULL, NULL);

            CreateWindow(L"button", L"Click me!", WS_CHILD | WS_VISIBLE, 20, 40, 75, 25, hwnd, (HMENU)1, NULL, NULL);
            break;

        case WM_COMMAND:

            switch (LOWORD(wparam))
            {
            case 1:
                int returnedCharacters = 0;
                returnedCharacters = GetWindowText(hTextBox, &szTextSaved[0], 20);
                break;
            }


        case WM_PAINT:
            hdc = BeginPaint(hwnd, &ps);
            GetClientRect(hwnd, &rect);
            DrawText(hdc, L"This is a text message!", -1, &rect,  DT_CENTER | DT_VCENTER);
            EndPaint(hwnd, &ps);
            break;

        case WM_DESTROY:
            PostQuitMessage(0);
            break;
    }

    return DefWindowProc(hwnd, message, wparam, lparam);
}