在swt上使用windows消息编程

原创文章，转帖请注明出处:

http://blog.youkuaiyun.com/palm_civet/archive/2010/11/15/6010881.aspx

 

最近看了一下windows编程，比较了一下swt底层的一些调用，发现swt封装了很多基本的函数，可以直接使用进行windows的消息编程

 

swt里面主要的windows函数都被封装在org.eclipse.swt.internal.win32.OS这个类里面，这个类大部分都是native方法，名称与window编程里面的一样，非常方便使用。

 

下面是windows编程书上的一个例子，只做了一部分

 

import org.eclipse.swt.internal.Callback; import org.eclipse.swt.internal.win32.MSG; import org.eclipse.swt.internal.win32.OS; import org.eclipse.swt.internal.win32.PAINTSTRUCT; import org.eclipse.swt.internal.win32.RECT; import org.eclipse.swt.internal.win32.TCHAR; import org.eclipse.swt.internal.win32.WNDCLASS; public class TestSwt { static TCHAR DialogClass = new TCHAR(0, OS.IsWinCE ? "Dialog" : "#32770", true); static int /* long */DialogProc; static String [] eventTable = null; static { eventTable = new String[8]; eventTable[0] = "BN_CLICKED"; eventTable[1] = "BN_PAINT"; eventTable[2] = "BN_HILITE/BN_PUSHED"; eventTable[3] = "BN_UNHILITE/BN_UNPUSHED"; eventTable[4] = "BN_DISABLE"; eventTable[5] = "BN_DOUBLECLICKED/BN_DBLCLK"; eventTable[6] = "BN_SETFOCUS"; eventTable[7] = "BN_KILLFOCUS"; } static TCHAR [] buttons = null; static int [] btnHandlers = null; static { buttons = new TCHAR[10]; buttons[0] = new TCHAR(0, "PUSHBUTTON", true); buttons[1] = new TCHAR(0, "DEFPUSHBUTTON", true); buttons[2] = new TCHAR(0, "CHECKBOX", true); buttons[3] = new TCHAR(0, "AUTOCHECKBOX", true); buttons[4] = new TCHAR(0, "RADIOBUTTON", true); buttons[5] = new TCHAR(0, "3STATE", true); buttons[6] = new TCHAR(0, "AUTO3STATE", true); buttons[7] = new TCHAR(0, "GROUPBOX", true); buttons[8] = new TCHAR(0, "AUTORADIO", true); buttons[9] = new TCHAR(0, "OWNERDRAW", true); btnHandlers = new int[buttons.length]; } static int cxChar, cyChar; static RECT rect = new RECT(); public static void main(String[] args) { TCHAR wndClassName = new TCHAR(0, "SWT_WINDOW", true); WNDCLASS wndClass = new WNDCLASS(); wndClass.hInstance = OS.GetModuleHandle(null); wndClass.lpfnWndProc = new Callback(TestSwt.class, "windowProc", 4).getAddress(); wndClass.style = OS.CS_HREDRAW | OS.CS_VREDRAW; wndClass.hCursor = OS.LoadCursor(0, OS.IDC_ARROW); wndClass.hbrBackground = OS.GetStockObject(OS.WHITE_BRUSH); wndClass.lpszClassName = OS.HeapAlloc(OS.GetProcessHeap(), OS.HEAP_ZERO_MEMORY, wndClassName.length() * 2); OS.MoveMemory(wndClass.lpszClassName, wndClassName, wndClassName.length() * 2); OS.RegisterClass(wndClass); int hWnd = OS.CreateWindowEx(0, wndClassName, new TCHAR(0, "测试窗体", true), OS.WS_OVERLAPPEDWINDOW, OS.CW_USEDEFAULT, OS.CW_USEDEFAULT, OS.CW_USEDEFAULT, OS.CW_USEDEFAULT, 0, 0, OS.GetModuleHandle(null), null); OS.ShowWindow(hWnd, OS.SW_SHOW); OS.UpdateWindow(hWnd); MSG lpMsg = new MSG(); while (OS.GetMessage(lpMsg, 0, 0, 0)) { OS.TranslateMessage(lpMsg); OS.DispatchMessage(lpMsg); } } static int windowProc(int /* long */hwnd, int /* long */msg, int /* long */wParam, int /* long */lParam) { switch ((int) msg) { case OS.WM_CREATE: //创建一个按钮 TCHAR ButtonClass = new TCHAR (0, "BUTTON", true); cxChar = OS.LOWORD (OS.GetDialogBaseUnits ()) ; cyChar = OS.HIWORD (OS.GetDialogBaseUnits ()) ; for (int i = 0; i < buttons.length; i++) { btnHandlers[i] = OS.CreateWindowEx(0, ButtonClass, buttons[i], OS.WS_CHILD | OS.WS_VISIBLE | i, cxChar, cyChar * (1 + 2 * i), 20 * cxChar, 7 * cyChar / 4, hwnd, 0, OS.GetModuleHandle(null), null); } return 0; case OS.WM_DESTROY: System.exit(wParam); case OS.WM_COMMAND : //处理button事件 int childId = OS.LOWORD (wParam); int eventId = OS.HIWORD (wParam); if ( eventId < TestSwt.eventTable.length) { System.out.println("event: " + TestSwt.eventTable[eventId]); } else { System.out.println("unknown event: " + eventId); } case OS.WM_SIZE: rect.left = 24 * cxChar ; rect.top = 2 * cyChar ; rect.right = OS.LOWORD (lParam) ; rect.bottom = OS.HIWORD (lParam) ; return 0 ; case OS.WM_PAINT : final PAINTSTRUCT lpPaint = new PAINTSTRUCT(); OS.InvalidateRect (hwnd, rect, true) ; int hdc = OS.BeginPaint (hwnd, lpPaint) ; OS.SelectObject (hdc, OS.GetStockObject (OS.SYSTEM_FONT)) ; OS.SetBkMode (hdc, OS.TRANSPARENT) ; } return OS.DefWindowProc(hwnd, (int) /* 64 */msg, wParam, lParam); } }