孙鑫视频中的“SetWindowLong”函数的使用问题

我现在在看孙鑫的视频，第7集讲的是对话框。用一个函数“SetWindowLong”来改变窗口的窗口过程。我是在VSTS2010下学习的。有一个问题是，当按视频的说明使用这个函数：
prevProc = (WNDPROC)SetWindowLong(GetDlgItem(IDC_EDIT1)->m_hWnd, GWL_WNDPROC, (LONG)WindowProc);
VS2010会产生错误，编译不过去，错误如下：

1>d:\practise\mfc\scale\scale\scaledlg.cpp(127): error C2440: 'type cast' : cannot convert from 'LRESULT (__thiscall CWnd::* )(UINT,WPARAM,LPARAM)' to 'LONG'
1> There is no context in which this conversion is possible

意思是类型转换不过去。请问各位，类型转换应该怎么写呢？还是这个函数已经更新了，有新的函数代替这个函数了？
谢谢！！！

你的返回值是LRESULT 还是 long

用static_cast<LONG>强制转换下
prevProc = (WNDPROC)SetWindowLong(GetDlgItem(IDC_EDIT1)->m_hWnd, GWL_WNDPROC, static_cast<LONG>WindowProc);

C/C++ code

WNDPROC wpOrigEditProc; 
 
LRESULT APIENTRY EditBoxProc(
    HWND hwndDlg, 
    UINT uMsg, 
    WPARAM wParam, 
    LPARAM lParam) 
{ 
    HWND hwndEdit; 
 
    switch(uMsg) 
    { 
        case WM_INITDIALOG: 
            // Retrieve the handle to the edit control. 
            hwndEdit = GetDlgItem(hwndDlg, ID_EDIT); 
 
            // Subclass the edit control. 
            wpOrigEditProc = (WNDPROC) SetWindowLong(hwndEdit, 
                GWL_WNDPROC, (LONG) EditSubclassProc); 
            // 
            // Continue the initialization procedure. 
            // 
            return TRUE; 
 
        case WM_DESTROY: 
            // Remove the subclass from the edit control. 
            SetWindowLong(hwndEdit, GWL_WNDPROC, 
                (LONG) wpOrigEditProc); 
            // 
            // Continue the cleanup procedure. 
            // 
            break; 
    } 
    return FALSE; 
        UNREFERENCED_PARAMETER(lParam); 
} 
 
// Subclass procedure 
LRESULT APIENTRY EditSubclassProc(
    HWND hwnd, 
    UINT uMsg, 
    WPARAM wParam, 
    LPARAM lParam) 
{ 
    if (uMsg == WM_GETDLGCODE) 
        return DLGC_WANTALLKEYS; 
 
    return CallWindowProc(wpOrigEditProc, hwnd, uMsg, 
        wParam, lParam); 
}