如何通过它的 id 获取 C++ MFC Control HANDLE？

Question

I have for example IDC_EDIT1 C++ MFC Controls , How Can I get its handle ? By which Windows API , Can I done it ?

Answer 1

CWnd派生对象有一个GetSafeHwnd成员函数来检索该对象的 Windows 句柄，因此如果您的控件在对话框中，您可以像这样检索句柄：

HWND hwnd = GetDlgItem(IDC_EDIT1).GetSafeHwnd();

Answer 2

You can get a handle to a control by calling the Windows API function GetDlgItem :

Retrieves a handle to a control in the specified dialog box.

The CWnd::GetDlgItem class member of the CWnd class also has an overload to retrieve a control's handle:

HWND hWnd = NULL;
someWnd->GetDlgItem( IDC_EDIT1, &hWnd );

Answer 3

I would like to throw my two cents in, too.

• Since you are in MFC world, you might be better off with the pointer to CWnd than with the raw HWND. In that case, use pWnd = GetDlgItem(IDC_EDIT1) .
• Take it one step further and create a "control variable" for your IDC_EDIT1 using Class Wizard. That way you would have a class member variable associated with that edit control, and you would not need to get its handle.