C ++ Windows API-如何使用ListView的默认WIndows Proc？

Question

Okay, I have a ListView and I've just worked out how to manually set it's Callback procedure:

// Sets the list view procedure
listproc = (D_ListView *) LocalAlloc(LMEM_FIXED, sizeof(D_ListView));
               listproc->oldproc = (WNDPROC)SetWindowLongPtr(g_hList, GWL_WNDPROC, (LONG)&ListViewProc);
               SetWindowLongPtr(g_hList, GWL_USERDATA, (LONG)&listproc);

I used a code example I found - D_ListView is just a struct with a WNDPROC variable called oldproc .

Anyhow, I'm sending messages to my ListView to add items. But I don't want to handle the ADD messages manually, I want to pass them onto the ListView's default procedure, and only handle messages that I need to over-ride the functionality for.

LRESULT CALLBACK ListViewProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        // Just a test - we're getting this message so it worked
        case LVM_INSERTCOLUMN:
        {
            cout << "CREATED" << endl;

        }    
    }
    WNDPROC* wp;
    wp = (WNDPROC*)(::GetWindowLongPtr(hwnd, GWL_WNDPROC));
    return ::CallWindowProc(*wp, hwnd, msg, wParam, lParam);   
}

In the above, I don't want to deal withe LVM_INSERTCOLUMN: I just want to pass it on.

Any one able to help?

Thanks, Rob

Answer 1

使用getWindowLongPtr (...GWL_USERDATA)获取指向D_ListView实例的指针，然后将所有不需要的消息转发到oldproc

::CallWindowProc(*listproc->oldproc, hwnd, msg, wParam, lParam);