本文介绍了GetDlgItem函数，该函数用于从指定的对话框中检索控件的句柄。参数包括对话框句柄及要检索的控件标识符。返回值为有效控件句柄表示成功，NULL则表示失败。此外，还可以应用于其他父-子窗口对。
摘抄一个函数
HWND GetDlgItem( HWND hDlg, int nIDDlgItem);
This function retrieves the handle to a control in the specified dialog box.
Parameters
- hDlg
- [in] Handle to the dialog box that contains the control. nIDDlgItem
- [in] Specifies the identifier of the control to be retrieved.
Return Values
The window handle of the specified control indicates success. NULL indicates failure due to an invalid dialog box handle or a nonexistent control. To get extended error information, call GetLastError.
Remarks
You can use the GetDlgItem function with any parent-child window pair, not just with dialog boxes. As long as the hDlg parameter specifies a parent window and the child window has a unique identifier， GetDlgItem returns a valid handle to the child window.
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