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Style Macro WS_OVERLAPPED WS_MAXIMIZEBOX WS_MINIMIZEBOX WS_SYSMENU WS_HSCROLL WS_VSCROLL
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Window Feature Overlapped window with border Maximize box Minimize box System menu Horizontal scroll bar Vertical scroll bar
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The hThisInst parameter is ignored by Windows 2000, but for Windows 95/98 it must contain the current instance handle of the application Thus, to ensure portability to those environments and to prevent future problems hThisInst should be assigned the current instance handle, as in the skeleton The CreateWindow( ) function returns the handle of the window it creates or NULL if the window cannot be created Once the window has been created, it is still not displayed on the screen To cause the window to be displayed, call the ShowWindow( ) API function This function has the following prototype: BOOL ShowWindow(HWND hwnd, int nHow); The handle of the window to display is specified in hwnd The display mode is specified in nHow The first time the window is displayed, you will want to pass WinMain( )'s nWinMode as the nHow parameter Remember, the value of nWinMode determines how the window will be displayed when the program begins execution Subsequent calls can display (or remove) the window as necessary Some common values for nHow are shown here: Display Macro SW_HIDE SW_MINIMIZE SW_MAXIMIZE SW_RESTORE Effect Removes the window Minimizes the window into an icon Maximizes the window Returns a window to normal size
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The ShowWindow( ) function returns the previous display status of the window If the window was displayed, nonzero is returned If the window was not displayed, zero is returned Although not technically necessary for the skeleton, a call to UpdateWindow( ) is included because it is needed by virtually every Windows 2000 application that you will create It essentially tells Windows 2000 to send a message to your application that the main window needs to be updated The Message Loop The final part of the skeletal WinMain( ) is the message loop The message loop is a part of all Windows applications Its purpose is to receive and process messages sent by Windows 2000 When an application is running, it is continually being sent messages These messages are stored in the application's message queue until they can be read and processed Each time your application is ready to read another message, it must call the API function GetMessage( ), which has this prototype: BOOL GetMessage(LPMSG msg, HWND hwnd, UINT min, UINT max); The message will be received by the structure pointed to by msg All Windows messages are of structure type MSG, shown here:
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/* Message structure typedef struct tagMSG { HWND hwnd; /* UINT message; /* WPARAM wParam; /* LPARAM lParam; /* DWORD time; /* POINT pt; /* } MSG;
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window that message is for */ message */ message-dependent info */ more message-dependent info */ time message posted */ X,Y location of mouse */
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In MSG, the handle of the window for which the message is intended is contained in hwnd All Windows 2000 messages are 32-bit integers, and the message is contained in message Additional information relating to each message is passed in wParam and lParam The types WPARAM and LPARAM are both 32-bit quantities The time the message was sent (posted) is specified in milliseconds in the time field The pt member will contain the coordinates of the mouse when the message was sent The coordinates are held in a POINT structure, which is defined like this:
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typedef struct tagPOINT { LONG x, y; } POINT;
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If there are no messages in the application's message queue, a call to GetMessage( ) will pass control back to Windows 2000 The hwnd parameter to GetMessage( ) specifies for which window messages will be obtained It is possible (even likely) that an application will contain several windows, and you may only want to receive messages for a specific window If you want to receive all messages directed at your application, this parameter must be NULL The remaining two parameters to GetMessage( ) specify a range of messages that will be received Generally, you want your application to receive all messages To accomplish this, specify both min and max as 0, as the skeleton does GetMessage( ) returns zero when the user terminates the program, causing the message loop to terminate Otherwise it returns nonzero It will return if an error occurs Errors can occur only 1 under unusual circumstances that do not apply to most programs Inside the message loop two functions are called The first is the API function TranslateMessage( ) This function translates the virtual key codes generated by Windows 2000 into character messages Although not necessary for all applications, most call TranslateMessage( ) because it is needed to allow full integration of the keyboard into your application program Once the message has been read and translated, it is dispatched back to Windows 2000 using the DispatchMessage( ) API function Windows 2000 then holds this message until it can pass it to the program's window function Once the message loop terminates, the WinMain( ) function ends by returning the value of msgwParam to Windows 2000 This value contains the return code generated when your program terminates The Window Function The second function in the application skeleton is its window function In this case the function is called WindowFunc( ), but it could have any name you like The window function is passed messages by Windows 2000 The first four members of the MSG structure are its parameters For the skeleton, the only parameter that is used is the message itself The skeleton's window function responds to only one message explicitly: WM_DESTROY This message is sent when the user terminates the program When this message is received, your program must execute a call to the API function PostQuitMessage( ) The argument to this function is an exit code that is returned in msgwParam inside WinMain( ) Calling PostQuitMessage( ) causes a WM_QUIT message to be sent to your application, which causes GetMessage( ) to return false and thus stops your program Any other messages received by WindowFunc( ) are passed along to Windows 2000, via a call to DefWindowProc( ), for default processing This step is necessary because all messages must be dealt with in one way or another Each message specifies the value that must be returned by the window function after the message has been processed Most of the commonly handled messages require that you return zero But a few require a different return value
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