Today's little program demonstrates how you can manipulate the positions of desktop icons.The entire program is just scaffolding to get us far enough that we can call IFolderView::GetItemPosition and IFolderView::SelectAndPositionItems.First, we
觀察者模式的定義是:定義一個對象之間一對多的依賴關係,當一個對象的狀態發生改變時,所有依賴於它的對象會自動被通知和更新。Define a one-to-many dependency between objects so that one object changes state, all its dependents are notified and updated
This topic demonstrates how to convert various Visual C++ string types into other strings. The strings types that are covered include char *, wchar_t*, _bstr_t,CComBSTR, CString, basic_string, and System.String. In all cases, a copy of the string is
無論是Factory 方法還是抽象工廠,所謂工廠就是生產之用,Factory 方法的作用就是生產一個對象。Factory 方法的定義為:為建立對象定義一個介面,但是讓子類決定執行個體化哪一個類。Factory 方法讓一個類把執行個體化延遲到子類。英文定義為:Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a
抽象工廠的定義為:不需要指定具體的類,為建立一系列有關聯或有依賴關係的對象提供一個介面(Provide an interface for creating families of related or dependent objects without specifying their concrete classes)。由定義可以看出,抽象工廠生產的是一系列產品(families of products),這就是與Factory 方法(Factory
單例模式的定義為:保證一個類只有一個執行個體,並且提供一個全域的訪問入口。Ensure a class only has one instance, and provide a global point of access it.雖然說,單例模式在所有的模式當中算是比較簡單的一個,但是如果牽扯到安全執行緒問題,似乎沒有那麼簡單。本文參考《Head First》和《Design
命令模式的定義為:把一個請求封裝成一個對象,因此可以使用不同的請求來參數化別的對象,將請求排入佇列或者記錄請求日誌,並且支援撤銷操作。官方定義為:The Command Pattern encapsulates a request as an object, thereby letting you parameterize other objects with different request, queue or log requests, and support undoable