GetWindowText Example in MFC C++

When developing applications with Microsoft Foundation Classes (MFC) in C++, it's common to encounter issues when working with window text using the GetWindowText function. In this article, we'll explore an example of how to use GetWindowText and troubleshoot a problem that may arise when calling this function.

GetWindowText is a Windows API function used to retrieve the text of a window. It takes three parameters: the handle of the window, a character buffer to store the retrieved text, and the maximum number of characters to be stored in the buffer. However, as with any Windows API function, there are potential pitfalls when using GetWindowText.

In our example, we're working with an MFC application that uses GetWindowText to retrieve the text of child windows after a database connection has been opened. The code is straightforward:

```cpp

Void CMFCApplication3Dlg::OnBnClickedButton1()

{

// Open database connection here

}

Void CMFCApplication3Dlg::OnBnClickedButton2()

{

::GetWindowText(hwnd, strTitle.GetBuffer(64), 64);

}

```

However, when running the application and pressing Button2 after opening a database connection, we encounter an Access Violation exception. The debug output shows that the exception occurs at address 0x00007FFA38A96F6C.

After some investigation, we found that this issue is specific to systems where KB5002226 is installed. When uninstalling this update, the problem resolves itself, and GetWindowText works as expected.

To troubleshoot similar issues, it's essential to understand how GetWindowText interacts with other Windows API functions. In our case, the problem may be related to changes introduced by KB5002226 that affect the way MFC applications interact with window text.

In summary, when working with GetWindowText in MFC C++, it's crucial to consider potential pitfalls and troubleshoot issues thoroughly. By understanding how this function interacts with other Windows API functions, we can develop more robust and reliable applications.

Getwindowtext example mfc c++