CEdit 不是 ATL 类.命名空间 ATLControls 来自哪里?有一个具有此名称的 WTL 类，从中获取文本很容易:

CEdit is not an ATL class. Where the namespace ATLControls comes from? There is a WTL class with this name and getting text from it is easy:

    ATLASSERT(Edit.IsWindow()); // Make sure the control holds a handle
    CString sWindowText;
    Edit.GetWindowText(sWindowText);

GetWindowText 方法来自 ATL 并且封装了 GetWindowTextLength 和 GetWindowText API.后一篇 MSDN 文章也有一段代码片段展示了典型用法.

The method GetWindowText is coming from ATL however and wraps GetWindowTextLength and GetWindowText API. The latter MSDN article also has a code snippet showing typical usage.

既然您提到 IsWindow 对您不起作用，那么最可能的问题是您的编辑控件包装类变量没有实际控件的句柄，因此从无到有获取文本不可能.

Since you mention that IsWindow does not work for you, the most likely problem is that your edit control wrapper class variable just does not have a handle of a real control, and hence getting text from nothing is impossible.