如何在Windows窗体应用程序设置中记录窗口位置

   HRESULT hr;

   ULONGLONG ullTag = RegisterWindowMessageA("PositionRecord");

   IPropertyStore *pPropStore = nullptr;

   hr = pView->get_Item(PKEY_DragDropSavePosition,&pPropStore);

   if (SUCCEEDED(hr)) {

       PROPVARIANT propVar = {0};

       propVar.vt = VT_I4;

       propVar.lVal = sizeof(HWND) + sizeof(INT32_T);

       PROPERTYKEY pkey_Hwnd;

       pkey_Hwnd.fmtid = PROGID_DragDrop;

       pkey_Hwnd.pid = ullTag;

       hr = pPropStore->SetValue(PKEY_Hwnd, &PKEY_DragDropSavePosition, PROPID_DragDropHwnd, &propVar);

       pPropStore->Release();

   }

   return S_OK;

   if (IDM_TRACKMOVESTATE == m_dwWMSysCommand) {

       RECORDPOS();

       return 0;

   }

   bHandled = FALSE;

   return 0;

   // Do the actual tracking move

   return S_FALSE;

   // Register tracking window handle and mouse position in Property Store to track mouse movement

   // This will capture position at the next TRACKMOUSEMOVE() call

   HRESULT hr;

   PROPVARIANT propVar = {0};

   propVar.vt = VT_I4;

   propVar.lVal = sizeof(HWND) + sizeof(INT32_T);

   PROPERTYKEY pkey_Hwnd;

   pkey_Hwnd.fmtid = PROGID_DragDrop;

   pkey_Hwnd.pid = ullTag;

   hr = pView->put_Item(PKEY_DragDropHwnd,&PKEY_DragDropHwnd,PKEY_DragDropSavePosition,PropVar);

   // Release the window Handle for Property Store

   pView->Release();

   // Set the window handle value in the mouse position Property Store

   // This helps to capture the position at the same mouse position at the next TRACKMOUSEMOVE

   PROPVARIANT tmpVar = PropVar;

   tmpVar.vt = VT_BYREF| VT_UI4;

   tmpVar.u4.lVal = Local.x + HWND_XPOS;

   PropertyKey tmpKey = {PKEY_DragDropHwnd,nullptr,PKEY_DragDropSavePosition};

   int res = pView->put_Item(PKEY_DragDropHwnd,&tmpKey,&tmpVar);

   // Release the mouse position data in Property Store	

   // Use the event tracking to save the current position and size of the view

   HRESULT hr;

   ULONGLONG ullTag = RegisterWindowMessageA("ViewState");

   IDropTarget *pDT = nullptr;

   // Register object to receive WM_DROPFILES as Drop Events 

   IDataObject *pDataobj = nullptr;

   hr = GetDragDropTarget(GetSafeHwnd(), IID_PPV_ARGS(&pDT));

   if (FAILED(hr)) throw;

   hr = QueryInterface(pDT->GetSafeInterface(&pDataobj));

   if (FAILED(hr)) throw;

   const CLSID *pclsid= IID_PPV_ARGS(&IID_IDropTarget);

   HGLOBAL hgDropGlobal = GlobalAlloc(0, FIELD_OFFSET(DropTarget,DataObject));

   pDT->OnDrop(pclsid, pDataobj);

   pDT->GetDropTarget()->GetInterface(IID_PPV\_ARGS(hgDropGlobal));

   GlobalFree(hgDropGlobal);

   // Register new ViewState

   ULONGLONG ullViewStateTag = RegisterWindowMessageA("ViewState");

   LONGLONG ullMinMaxX = 0x10016A5A2540 ull, ullMinMaxY = 0x10016A5A2548 ull, ullMinMaxW = 0x10016A5A1FE0 ull, ullMinMaxH = 0x10016A5A1FF8 ull;

   CWindows::UpdateViewSizeMinMaxRect(ullMinMaxX, ullMinMaxY, ullMinMaxW, ullMinMaxH);

   PropVariant propvar;

   propvar.vt = VT_UI8;

   propvar.ui8 = 0;

   hr = pView->put\_PropVariant(PKEY\_DragDropSaveViewSizeMinMax rects, &propvar, ullTag);

   // Record the ViewState as well 

   CWindows::SetPropData(PKEY\_DragDropSaveViewState rects, &propvar, ullTag);

   // Set the window handle value in the Viewstte Property Store

   PROPVARIANT tmpVar = PropVar;

   tmpVar.vt = VT_BYREF| VT_UI8;

   tmpVar.u8 = 4096 ull;

   propvar = PROPVARIANT(ullMinMaxW, ullMinMaxY, ullMinMaxX, ullMinMaxH);

   hr = pView->put\_PropVariant(PKEY\_DragDropSaveViewState, &PKEY\_DragDropSaveViewState, propvar, ullTag);

   // Release the window handle variable for Property Store

   pView->Release();

   // Release the dragged object data in Property Store

   CWindows::DestroyDropGlobal(pDataobj);