C++ CustomDraw中的SetWindowLong导致未处理的异常

我正在使用自定义绘图对CSliderCtrl进行一些更改，该控件将在对话框中使用。结构如下： 在我的MessageMap中，我有：

ON\u NOTIFY\u REFLECT\u EX（NM\u CUSTOMDRAW，OnNMCustomdraw）

OnNMCustomdraw方法如下所示：

BOOL CCustomSliderCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
{
    *pResult = CDRF_DODEFAULT;
    LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);

    switch(pNMCD->dwDrawStage)
    {
        case CDDS_PREPAINT:
        {
            //Dialogs don't receive CDRF_NOTIFYITEMDRAW notifcations by returning it as part of pResult, we must
            //use the following so we ensure we receive the msg
            SetWindowLong(pNMHDR->hwndFrom, DWL_MSGRESULT, CDRF_NOTIFYITEMDRAW);
            return TRUE;
        }
        case CDDS_ITEMPREPAINT:
            if(pNMCD->dwItemSpec == TBCD_CHANNEL)
            {
                ...SNIP...
                SetWindowLong(pNMHDR->hwndFrom, DWL_MSGRESULT, CDRF_SKIPDEFAULT);
                return TRUE;
            }
    }
    return FALSE;
}

那么，有人对这件事有什么见解吗？如果你需要更多信息，请告诉我

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更新：我现在已经找到了一个解决方法，而不是使用SetWindowLong，我只是将结果分配给pResult，然后返回。我通过调用SetRangeMin（GetRangeMin（），TRUE）；，强制重新绘制子项；，虽然不太优雅，但很管用

您在错误的窗口中调用了

SetWindowLong

。

SetWindowLong

的第一个参数是处理消息的对话框，而不是发送消息的窗口<代码>设置窗口长（m_hWnd、DWL_MSGRESULT、CDRF_NOTIFYITEMDRAW）

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您的代码正在更改“发件人”窗口上的窗口长度，这最终会损坏该窗口的私有数据。

提示：要获得更好的堆栈跟踪，请配置一个“谢谢”，我现在就开始玩这个。添加了一个更好的堆栈跟踪，谢谢提示。

comctl32.dll!_TrackBarWndProc@16()  + 0x551 bytes   
user32.dll!_InternalCallWinProc@20()  + 0x28 bytes  
user32.dll!_UserCallWinProcCheckWow@32()  + 0xb7 bytes  
user32.dll!_CallWindowProcAorW@24()  + 0x51 bytes   
user32.dll!_CallWindowProcW@20()  + 0x1b bytes  
mfc90ud.dll!CWnd::DefWindowProcW(unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 1043 + 0x20 bytes    C++
mfc90ud.dll!CWnd::WindowProc(unsigned int message=15, unsigned int wParam=0, long lParam=0)  Line 1756 + 0x1c bytes C++
mfc90ud.dll!AfxCallWndProc(CWnd * pWnd=0x0012fdbc, HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 240 + 0x1c bytes C++
mfc90ud.dll!AfxWndProc(HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 403  C++
mfc90ud.dll!AfxWndProcBase(HWND__ * hWnd=0x000308fe, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 441 + 0x15 bytes C++
user32.dll!_InternalCallWinProc@20()  + 0x28 bytes  
user32.dll!_UserCallWinProcCheckWow@32()  + 0xb7 bytes  
user32.dll!_DispatchClientMessage@20()  + 0x4d bytes    
user32.dll!___fnDWORD@4()  + 0x24 bytes 
ntdll.dll!_KiUserCallbackDispatcher@12()  + 0x13 bytes  
user32.dll!_NtUserDispatchMessage@4()  + 0xc bytes  
user32.dll!_DispatchMessageW@4()  + 0xf bytes   
mfc90ud.dll!AfxInternalPumpMessage()  Line 183  C++
mfc90ud.dll!CWinThread::PumpMessage()  Line 900 C++
mfc90ud.dll!AfxPumpMessage()  Line 190 + 0xd bytes  C++
mfc90ud.dll!CWnd::RunModalLoop(unsigned long dwFlags=4)  Line 4386 + 0x5 bytes  C++
mfc90ud.dll!CDialog::DoModal()  Line 584 + 0xc bytes    C++
SetSelection.exe!CSetSelectionApp::InitInstance()  Line 64 + 0xb bytes  C++
mfc90ud.dll!AfxWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020a84, int nCmdShow=1)  Line 37 + 0xd bytes C++
SetSelection.exe!wWinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__ * hPrevInstance=0x00000000, wchar_t * lpCmdLine=0x00020a84, int nCmdShow=1)  Line 34  C++
SetSelection.exe!__tmainCRTStartup()  Line 578 + 0x35 bytes C
SetSelection.exe!wWinMainCRTStartup()  Line 403 C
kernel32.dll!_BaseProcessStart@4()  + 0x23 bytes