Download Mastering Windows 2000 Programming With Visual C++ by Ben Ezzell PDF

By Ben Ezzell

Home windows 2000 is a massive improve of the home windows platform and introduces a couple of new good points that impact home windows builders, together with COM+ (an extension of COM that replaces Microsoft Transaction Server), help for a brand new model of ADO (for database developers), and a bunch of latest APIs. This publication covers either crucial home windows improvement issues (such as reminiscence administration and pics programming), in addition to introducing firm subject matters (three-tier net and database programming).

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Similarly, when the OnHScroll() function is called in response to a scrollbar event, parameters are passed specifying the type of event and the thumbpad position. In conventional coding, this information would still be available but would require decoding before use. Message-mapped functions will appear in many of the sample programs later in this book, but, for a very brief example, a message map containing an ON_COMMAND macro might look something like this: BEGIN_MESSAGE_MAP( CMyDoc, CDocument ) //{{AFX_MSG_MAP( CMyDoc ) ON_COMMAND( ID_MYCMD, OnMyCommand ) ON_COMMAND( ID_FILE_OPEN, OnFileOpen ) ON_WM_LBUTTONDOWN() ON_WM_MOUSEMOVE() ON_WM_LBUTTONUP() ON_WM_RBUTTONDOWN() ON_WM_RBUTTONUP() ON_WM_SIZE() // ...

This parameter will, however, frequently be needed as an argument for use by other processes. At the present, the second calling parameter, msg, is crucial immediately and identifies the window event message. The third and fourth parameters, wParam and lParam, provide amplifying information to accompany the window event message. case responding to the msg parameter. In the WinHello demo, local response is provided for only two event messages: the WM_PAINT and WM_DESTROY messages. All other event messages are handled by default (by the operating system).

Registering a Window Class The first task accomplished within the WinMain procedure depends on the hPrevInstance argument passed. If a previous instance of this application is already active, there’s no need to register the window class a second time. It’s more likely, of course, that this is the first instance of the application (hPrevInstance is NULL) and, therefore, the window class definitions must be assigned and the window class registered. H (which must be included in all Windows applications).

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