标签：rac send entry object int 显示 操作 event null
近期在做winCE系统的扫描枪应用程序，遇到了一些问题，其中包括消失提示框在手持终端显示过小，
用户要求提示框提示几秒后自动关闭，Windows平台可以通过调用系统API以定时器的方式进行自动销毁。
不过在winCE上存在不同，由于winCE系统属于精简版的windows系统，所以在API上也是属于精简后的，
Windows平台销毁消息框用user32.dll中的FindWindow和PostMessage完成，而winCE平台并没有
user32.dll，不过对应的API在coredll.dll中。
windows平台示例代码：
1 [DllImport("user32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)] 2 internal static extern IntPtr FindWindow(string className,string windowName); 3 4 [DllImport("user32.dll", EntryPoint = "PostMessage", CharSet = CharSet.Auto)] 5 internal static extern int PostMessage(IntPtr hWnd,int msg,IntPtr wParam,IntPtr lParam); 6 7 internal const int WM_CLOSE = 0x10; 8 Timer timer = new Timer(); 9 10 private void btnAutoCloseMesaage_Click(object sender, EventArgs e) 11 { 12 runKillTimer(); 13 MessageBox.Show("操作已完成，可以关闭！","Message"); 14 } 15 16 /// <summary> 17 /// 运行timer 18 /// </summary> 19 internal void runKillTimer() 20 { 21 timer.Interval = 2000; 22 timer.Tick+=timer_Tick; 23 timer.Start(); 24 } 25 26 /// <summary> 27 /// timer触发关闭消息框 28 /// </summary> 29 /// <param name="sender"></param> 30 /// <param name="e"></param> 31 private void timer_Tick(object sender, EventArgs e) 32 { 33 KillMessageBox(); 34 timer.Stop(); 35 } 36 37 /// <summary> 38 /// 调用API查找窗体并关闭 39 /// </summary> 40 internal void KillMessageBox() 41 { 42 IntPtr msgPtr = FindWindow(null, "Message"); 43 if (msgPtr != IntPtr.Zero) 44 { 45 PostMessage(msgPtr, WM_CLOSE, IntPtr.Zero, IntPtr.Zero); 46 } 47 }
winCE平台示例代码:
1 [DllImport("coredll.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)] 2 internal static extern IntPtr FindWindow(string className,string windowName); 3 4 [DllImport("coredll.dll", EntryPoint = "PostMessage", CharSet = CharSet.Auto)] 5 internal static extern int PostMessage(IntPtr hWnd,int msg,IntPtr wParam,IntPtr lParam); 6 7 internal const int WM_CLOSE = 0x10; 8 Timer timer = new Timer(); 9 10 private void btnAutoCloseMesaage_Click(object sender, EventArgs e) 11 { 12 runKillTimer(); 13 MessageBox.Show("操作已完成，可以关闭！","Message"); 14 } 15 16 /// <summary> 17 /// 运行timer 18 /// </summary> 19 internal void runKillTimer() 20 { 21 timer.Interval = 2000; 22 timer.Tick+=new EventHandler(timer_Tick); 23 timer.Enabled = true; 24 } 25 26 /// <summary> 27 /// timer触发关闭消息框 28 /// </summary> 29 /// <param name="sender"></param> 30 /// <param name="e"></param> 31 private void timer_Tick(object sender, EventArgs e) 32 { 33 KillMessageBox(); 34 timer.Enabled = false; 35 } 36 37 /// <summary> 38 /// 调用API查找窗体并关闭 39 /// </summary> 40 internal void KillMessageBox() 41 { 42 IntPtr msgPtr = FindWindow(null, "Message"); 43 if (msgPtr != IntPtr.Zero) 44 { 45 PostMessage(msgPtr, WM_CLOSE, IntPtr.Zero, IntPtr.Zero); 46 } 47 }
ps:大家有其他好的意见或建议也可以多多交流。
标签：rac send entry object int 显示 操作 event null
原文地址：http://www.cnblogs.com/ultimateWorld/p/6183922.html
