[英]Assertion in VS2008 but not in VS2005
從 VS2005 切換到 VS2008 SP1 后,我發現了一個我無法解釋的問題。
一個程序在 VS2005 下在發布和調試模式下都能正常工作。 在 VS2008 下,當進入調試器時,會引發一個斷言。
如果我讓程序運行(在調試或發布模式下),則根本沒有斷言。
我花了將近兩天的時間,我不明白我做錯了什么。
程序描述:我有一個基於 MFC 對話框的程序,它創建了一個用戶線程 (CWinThread),該線程創建了應用程序的主對話框。
工作線程無限循環並每秒向對話框發布一條消息。 消息在 gui 線程中處理。
我的代碼的某些部分:
gui線程的InitInstance:
BOOL CGraphicalThread::InitInstance()
{
CGUIThreadDlg* pDlg = new CGUIThreadDlg();
pDlg->Create(CGUIThreadDlg::IDD);
m_pMainWnd = pDlg;
AfxGetApp()->m_pMainWnd = pDlg;
return TRUE;
}
工作線程:
UINT ThreadProc(LPVOID pVoid)
{
do
{
AfxGetApp()->m_pMainWnd->PostMessage(WM_APP+1, (WPARAM)new CString("Hello"), NULL);
Sleep(1000);
}
while(!bStopThread);
return 0;
}
對話消息處理程序是這樣的:
LRESULT CGUIThreadDlg::OnMsg(WPARAM wp, LPARAM lp)
{
CListBox* pList = (CListBox*)GetDlgItem(IDC_LIST1);
CString* ps = (CString*)wp;
pList->InsertString(-1, *ps);
delete ps;
return 1L;
}
這與 VS2005 完美配合。 但是用VS2008,但是只要下斷點並進入調試模式,我就提出了一個斷言???
wincore.cpp 第 906 行
CObject* p=NULL;
if(pMap)
{
ASSERT( (p = pMap->LookupPermanent(m_hWnd)) != NULL ||
(p = pMap->LookupTemporary(m_hWnd)) != NULL);
}
ASSERT((CWnd*)p == this); // must be us
// Note: if either of the above asserts fire and you are
// writing a multithreaded application, it is likely that
// you have passed a C++ object from one thread to another
// and have used that object in a way that was not intended.
// (only simple inline wrapper functions should be used)
//
// In general, CWnd objects should be passed by HWND from
// one thread to another. The receiving thread can wrap
// the HWND with a CWnd object by using CWnd::FromHandle.
//
// It is dangerous to pass C++ objects from one thread to
// another, unless the objects are designed to be used in
// such a manner.
如果我刪除 GUI 線程並將對話框創建到 CWinApp 線程中,則問題不再發生。
有人知道嗎?
難道我做錯了什么?
謝謝
// Note: if either of the above asserts fire and you are
// writing a multithreaded application, it is likely that
// you have passed a C++ object from one thread to another
// and have used that object in a way that was not intended.
// (only simple inline wrapper functions should be used)
//
// In general, CWnd objects should be passed by HWND from
// one thread to another. The receiving thread can wrap
// the HWND with a CWnd object by using CWnd::FromHandle.
//
// It is dangerous to pass C++ objects from one thread to
// another, unless the objects are designed to be used in
// such a manner.
@Ismael:我已經嘗試過斷言仍然被解雇。 我發現刪除斷言的唯一方法是在 CWinApp 線程中創建對話框。 但這並不能解釋會發生什么,因為仍然有工作線程每秒發布到對話框。 總之感謝。
@daanish.rumani:我檢查了 wincore.cpp 和 CWnd::AssertValid() 完全相同(但文件的 rest 有很多差異)。
我會接受一段代碼適用於 VS2005 而不是 VS2008,但是
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