在关闭打开它的应用程序时如何保持属性对话框打开？

Question

我正在做一些可以拉出上下文菜单的东西。我希望能够关闭应用程序，同时保留“属性”等打开的内容。发生的情况是，如果您打开上下文菜单，选择“属性”，它会打开属性对话框并很好地关闭上下文菜单。但是当我关闭我的应用程序时，属性窗口也会关闭。

问题是：如何保持窗口打开？如果你不能，应用程序如何判断它是否有一个依赖于它打开的窗口/对话框？ EnumWindows 不显示它； Spy++ 显示属性对话框也独立存在（在桌面下）。

CComPtr<IContextMenu> pMenu;
CComPtr<IShellFolder> pFolder;
PCUITEMID_CHILD pidl = NULL;
SHBindToParent(item.pidl, IID_IShellFolder, (void**)&pFolder, &pidl);
pFolder->GetUIObjectOf(NULL, 1, &pidl, IID_IContextMenu, NULL, (void**)&pMenu);
UINT flags = CMF_NORMAL | CMF_CANRENAME;
pMenu->QueryContextMenu(menu, CID_FIRST, CID_LAST, 0x7fff, flags);
.
.
.
// command invocation
CMINVOKECOMMANDINFOEX info;
memset(&info, 0, sizeof(info));
info.cbSize = sizeof(info);
info.fMask = CMIC_MASK_NOASYNC | CMIC_MASK_PTINVOKE; // I've played around with flags
info.hwnd = toolbar.m_hWnd; // I've played around with this value
info.lpVerb = MAKEINTRESOURCEA(cid - CID_LAST);
info.nShow = SW_SHOWNORMAL;
info.ptInvoke = point;
pMenu->InvokeCommand((CMINVOKECOMMANDINFO*)&info);  

TIA！！

Answer 1

属性对话框正在进行中。

您需要致电SHSetInstanceExplorer和keep your process alive until that COM object is released：

int main()
{
    struct CoInit { HRESULT m_hr; CoInit() { m_hr = CoInitialize(0); } ~CoInit() { if (SUCCEEDED(m_hr)) CoUninitialize(); } } coinit;
    ProcessReference ref;
    IShellItem*pSI;
    HRESULT hr = SHCreateItemInKnownFolder(FOLDERID_Windows, KF_FLAG_DEFAULT, L"Explorer.exe", IID_IShellItem, (void**) &pSI);
    if (hr) return hr;
    IContextMenu*pCM;
    hr = pSI->BindToHandler(NULL, BHID_SFUIObject, IID_IContextMenu, (void**) &pCM);
    pSI->Release();
    if (hr) return hr;
    //HMENU menu = CreatePopupMenu();
    //pCM->QueryContextMenu(menu, 0, 1, 0x7fff, CMF_NORMAL);
    CMINVOKECOMMANDINFO info;
    memset(&info, 0, sizeof(info));
    info.cbSize = sizeof(info);
    info.fMask = CMIC_MASK_NOASYNC; // I've played around with flags
    info.hwnd = NULL; // I've played around with this value
    info.lpVerb = "Properties";
    info.nShow = SW_SHOWNORMAL;
    //info.ptInvoke = point;
    hr = pCM->InvokeCommand((CMINVOKECOMMANDINFO*)&info);
    pCM->Release();
    return hr;
}

Answer 2

EnumWindows 不显示它

如果我误解了什么，请告诉我。

这是我的测试：

第二张截图是我用EnumWindows得到的，在我看来，对于一些APP Properties Dialog，你可以用EnumWindows得到它。

同时，正如@Jonathan Potter 所说，shell 属性对话框是在进程中运行的，您可以使用ShellExecuteEx 独立打开属性对话框。

仅作为补充，如果你只是想独立打开属性对话框，可以使用上面的api。这样，当你关闭应用程序时，你可以重新打开属性对话框，如果你不打扰。

最小代码示例：

#include <windows.h>
#include <shlobj_core.h>

#pragma comment(lib,"Shell32.lib")

class ProcessReference : public IUnknown {
public:
    STDMETHODIMP QueryInterface(REFIID riid, void **ppv)
    {
        if (riid == IID_IUnknown) {
            *ppv = static_cast<IUnknown*>(this);
            AddRef();
            return S_OK;
        }
        *ppv = NULL; return E_NOINTERFACE;
    }
    STDMETHODIMP_(ULONG) AddRef()
    {
        return InterlockedIncrement(&m_cRef);
    }
    STDMETHODIMP_(ULONG) Release()
    {
        LONG lRef = InterlockedDecrement(&m_cRef);
        if (lRef == 0) PostThreadMessage(m_dwThread, WM_NULL, 0, 0);
        return lRef;
    }
    ProcessReference()
        : m_cRef(1), m_dwThread(GetCurrentThreadId())
    {
        SHSetInstanceExplorer(this);
    }
    ~ProcessReference()
    {
        SHSetInstanceExplorer(NULL);
        Release();
        MSG msg;
        while (m_cRef && GetMessage(&msg, NULL, 0, 0)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }
private:
    LONG m_cRef;
    DWORD m_dwThread;
};

int main(void)
{
    struct CoInit { HRESULT m_hr; CoInit() { m_hr = CoInitialize(0); } ~CoInit() { if (SUCCEEDED(m_hr)) CoUninitialize(); } } coinit;
    ProcessReference ref;
    IShellItem*pSI;
    HRESULT hr = SHCreateItemInKnownFolder(FOLDERID_Windows, KF_FLAG_DEFAULT, L"Explorer.exe", IID_IShellItem, (void**)&pSI);
    if (hr) return hr;
    IContextMenu*pCM;
    hr = pSI->BindToHandler(NULL, BHID_SFUIObject, IID_IContextMenu, (void**)&pCM);
    pSI->Release();
    if (hr) return hr;

    SHELLEXECUTEINFO info = { 0 };

    info.cbSize = sizeof info;
    info.lpFile = "C:\\Users\\strives\\Desktop\\print.txt";
    info.nShow = SW_SHOW;
    info.fMask = SEE_MASK_INVOKEIDLIST;
    info.lpVerb = "properties";

    ShellExecuteEx(&info);


}

更新：

SHELLEXECUTEINFO info = { 0 };

info.cbSize = sizeof info;
info.lpFile = "C:\\Users\\strives\\Desktop\\Test.txt";
info.nShow = SW_SHOW;
info.fMask = SEE_MASK_INVOKEIDLIST;
info.lpVerb = "openas";

ShellExecuteEx(&info);

调试：