Question

GetDlgItem的问题

HWND GetDlgItem(
HWND hDlg,
int nIDDlgItem
);

请问这两个参数都表示什么意思，应该怎样得到？？

Answer 1

第一个是控件的句柄,第二个是它的ID号,建议直接用这个函数,
CWnd* GetDlgItem ( int nID ) const;这个就足够了(在MFC中经常这么用),如果你是在win32API下面写的话,那么一般创建一个窗口都会产生一个句柄的.

Answer 2

hWnd是父窗口的句柄，一般用m_hWnd就可以了
第二个参数是控件的ID号。

Answer 3

不好意思,转自MSDN:
GetDlgItem
The GetDlgItem function retrieves the handle of a control in the specified dialog box.

HWND GetDlgItem(
HWND hDlg, // handle of dialog box
int nIDDlgItem // identifier of control
);

Parameters
hDlg
Identifies the dialog box that contains the control.
nIDDlgItem
Specifies the identifier of the control to be retrieved.
Return Values
If the function succeeds, the return value is the window handle of the given control.

If the function fails, the return value is NULL, indicating an invalid dialog box handle or a nonexistent control. To get extended error information, callGetLastError.

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 (as specified by the hMenu parameter in the CreateWindow or CreateWindowEx function that created the child window), GetDlgItem returns a valid handle to the child window.

Windows CE: The GetDlgItem function only works for immediate child controls of a dialog box—it will not search through nested dialog boxes.

QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winuser.h.
Import Library: Use user32.lib.