qt以管理員drop身份運行無效爲什麼？

qt以管理員drop身份運行無效，我在qt中使用了win32 api ChangeWindowMessageFilterEx但不工作，我在MFC中使用win32 api ChangeWindowMessageFilterEx工作正常。qt以管理員drop身份運行無效爲什麼？

當我以管理員身份運行時，無法接收qt中的WM_DROPFILES消息。這是QT

int main(int argc, char *argv[]) 
{ 
    QApplication a(argc, argv); 
    DropTest w; 
    w.show(); 

    CHANGEFILTERSTRUCT chfit1 = { sizeof(CHANGEFILTERSTRUCT) }; 
    CHANGEFILTERSTRUCT chfit2 = { sizeof(CHANGEFILTERSTRUCT) }; 
    CHANGEFILTERSTRUCT chfit3 = { sizeof(CHANGEFILTERSTRUCT) }; 
    HWND hwnd = (HWND)w.winId();; 
    DragAcceptFiles(hwnd, TRUE); 

    DropTest::ChangeWndMessageFilterOk(hwnd, WM_DROPFILES, MSGFLT_ALLOW, &chfit1); 
    DropTest::ChangeWndMessageFilterOk(hwnd, WM_COPYDATA, MSGFLT_ALLOW, &chfit2); 
    DropTest::ChangeWndMessageFilterOk(hwnd, 0x0049, MSGFLT_ALLOW, &chfit3);  // 0x0049 == WM_COPYGLOBALDATA 


    //MyXcbEventFilter nativeEventFilterZ; 
    //a.installNativeEventFilter(&nativeEventFilterZ); 
    return a.exec(); 
} 


BOOL DropTest::ChangeWndMessageFilterOk(HWND hWnd, UINT nMessage, DWORD dwAction, PCHANGEFILTERSTRUCT chfit) 
{ 
    //typedef BOOL (WINAPI * ChangeWindowMessageFilterOkFn)(__in HWND hWnd, __in UINT message, __in DWORD action, __inout_opt PCHANGEFILTERSTRUCT pChangeFilterStruct); 
    typedef BOOL (WINAPI *ChangeWindowMessageFilterOkFn)(HWND, UINT, DWORD, PCHANGEFILTERSTRUCT); 
    HMODULE hModUser32 = NULL; 
    hModUser32 = LoadLibrary(L"user32.dll"); 
    if (hModUser32 == NULL) { 
     return FALSE; 
    } 

    ChangeWindowMessageFilterOkFn pfnChangeWindowMessageFilter = (ChangeWindowMessageFilterOkFn) GetProcAddress(hModUser32, "ChangeWindowMessageFilterEx"); 
    if (pfnChangeWindowMessageFilter == NULL) 
    { 
     FreeLibrary(hModUser32); 
     return FALSE; 
    } 

    FreeLibrary(hModUser32); 
    BOOL ret = pfnChangeWindowMessageFilter(hWnd, nMessage, dwAction, chfit); 
    QString strOut = QString("%1 ret = [%2] ExtStatus=[%3]\n").arg(__FUNCTION__, QString::number(ret), QString::number(chfit->ExtStatus)); 
    OutputDebugString(strOut.toStdWString().c_str()); 
    return ret; 
}

來源

2017-07-25 liyingzai

你會得到什麼錯誤信息？ – rene

不能接收WM_DROPFILES消息 – liyingzai

我找到reseason，使用RevokeDragDrop就行了！這是qt源

void QWindowsWindow::setDropSiteEnabled(bool dropEnabled) 
{ 
    if (isDropSiteEnabled() == dropEnabled) 
     return; 
    qCDebug(lcQpaMime) << __FUNCTION__ << window() << dropEnabled; 
#if !defined(QT_NO_CLIPBOARD) && !defined(QT_NO_DRAGANDDROP) 
    if (dropEnabled) { 
     Q_ASSERT(m_data.hwnd); 
     m_dropTarget = new QWindowsOleDropTarget(window()); 
     RegisterDragDrop(m_data.hwnd, m_dropTarget); 
     CoLockObjectExternal(m_dropTarget, true, true); 
    } else { 
     CoLockObjectExternal(m_dropTarget, false, true); 
     m_dropTarget->Release(); 
     RevokeDragDrop(m_data.hwnd); 
     m_dropTarget = 0; 
    } 
#endif // !QT_NO_CLIPBOARD && !QT_NO_DRAGANDDROP 
}

來源

2017-07-26 02:52:56 liyingzai

qt以管理員drop身份運行無效爲什麼？

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