我是编程RFID读者的新手。我有摩托罗拉MC9090G1，我的任务 - 阅读RFID标签并将其写在列表中。在摩托罗拉EMDK for .NET就是一个例子，这是我的目标。但问题是标签列表的添加不是即时的，而是一个显着的延迟（15-30秒）。如何解决？
以下是代码：
git clean -d -fx ""
}
最初认为计时器中的问题：
/// <summary>
/// The main entry point for the application.
/// </summary>
static void Main()
{
ReaderForm rf = new ReaderForm();
rf.DoScale();
Application.Run(rf);
}
/// <summary>
/// Occurs before the form is displayed for the first time.
/// </summary>
private void ReaderForm_Load(object sender, System.EventArgs e)
{
// Add MainMenu if Pocket PC
if (Symbol.Win32.PlatformType.IndexOf("PocketPC") != -1)
{
this.Menu = new MainMenu();
}
// If we can initialize the Reader
if ( !this.InitReader() )
{
MessageBox.Show("Unable to initialize RFID!","Error");
// If not, close this form
this.Close();
return;
}
}
/// <summary>
/// Application is closing
/// </summary>
protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
// Terminate reader
this.TermReader();
base.OnClosing(e);
}
/// <summary>
/// Initialize the reader.
/// </summary>
private bool InitReader()
{
// If reader is already present then fail initialize
if ( this.MyReader != null )
{
return false;
}
try
{
// Create new reader, first available reader will be used.
this.MyReader = new Symbol.RFID.Reader();
// Create reader data to read upto 20 tags
this.MyReaderData = new Symbol.RFID.ReaderData(20);
// Enable reader
this.MyReader.Actions.Enable();
// Attach handler for read notification
this.MyEventHandler = new EventHandler(MyReader_ReadNotify);
this.MyReader.ReadNotify += this.MyEventHandler;
// Attach handler for trigger notification
this.MyTriggerHandler = new Symbol.RFID.Reader.TriggerEventHandler(MyTrigger_Pressed);
this.MyReader.TriggerNotify += this.MyTriggerHandler;
// Attach to activate and deactivate events
this.Activated += new EventHandler(ReaderForm_Activated);
this.Deactivate +=new EventHandler(ReaderForm_Deactivate);
}
catch
{
return false;
}
return true;
}
/// <summary>
/// Stop reading and disable/close reader
/// </summary>
private void TermReader()
{
// If we have a reader
if ( this.MyReader != null )
{
// Remove read notification handler
this.MyReader.ReadNotify -= null;
// Attempt to stop any pending read
this.StopRead();
// Disable reader, with wait cursor
this.MyReader.Actions.Disable();
// Free it up
this.MyReader.Dispose();
// Indicate we no longer have one
this.MyReader = null;
}
// If we have a reader data
if ( this.MyReaderData != null )
{
// Free it up
this.MyReaderData.Dispose();
// Indicate we no longer have one
this.MyReaderData = null;
}
}
/// <summary>
/// Start a read on the reader
/// </summary>
private void StartRead()
{
this.StatusLabel.Text = "Reading ...";
// If the flag is set then start a new TagList
if (ClearListFlag)
this.MyReaderData.ClearInventory = true;
else
this.MyReaderData.ClearInventory = false;
// If we have both a reader and a reader data
if((this.MyReader != null) && (this.MyReaderData != null))
{
// Submit a read
this.MyReader.Actions.Read(this.MyReaderData);
}
}
/// <summary>
/// Stop all reads on the reader
/// </summary>
private void StopRead()
{
// If we have a reader
if ( this.MyReader != null )
{
// Prevent new reads
this.MyReader.TriggerNotify -= this.MyTriggerHandler;
// Disable the timer
this.ReaderTimer.Enabled = false;
// Try to cancel pending read or wait for it's completion
this.MyReader.Actions.Flush();
}
}
/// <summary>
/// Handles Stage2 Notification from the trigger
/// </summary>
private void MyTrigger_Pressed(object sender, Symbol.RFID.TriggerEventArgs e)
{
if ( e.NewState == Symbol.RFID.TriggerState.STAGE2 )
{
this.StatusLabel.Text = "Trigger Pressed. Reader Busy...";
// If another RFID operation has not already started
if (!this.MyReader.Info.IsBusy)
{
// Start a new read
this.StartRead();
}
// Set timer which handles sending further reads until trigger is released
this.ReaderTimer.Interval = 2000;
this.ReaderTimer.Enabled = true;
}
else if ( e.NewState == Symbol.RFID.TriggerState.RELEASED )
{
this.StatusLabel.Text = "Press trigger to read RFID tags";
// Disable the timer
this.ReaderTimer.Enabled = false;
}
}
/// <summary>
/// Submits a new read at every timer tick
/// </summary>
private void ReaderTimer_Tick(object sender, System.EventArgs e)
{
// If another RFID operation has not already started
if (!this.MyReader.Info.IsBusy)
{
// Start a new read
this.StartRead();
}
}
/// <summary>
/// Read complete or failure notification
/// </summary>
private void MyReader_ReadNotify(object sender, EventArgs e)
{
// Get the next ReaderData
Symbol.RFID.ReaderData TheReaderData =
(Symbol.RFID.ReaderData)this.MyReader.GetNextReaderData();
// If it is a successful read (as opposed to a failed one)
if ( TheReaderData.Result == Symbol.Results.SUCCESS )
{
// Handle the data from this read
this.HandleData(TheReaderData);
}
}
/// <summary>
/// Handle data from the reader
/// </summary>
private void HandleData(Symbol.RFID.ReaderData TheReaderData)
{
// Clear the previous list
this.ReaderDataListView.Items.Clear();
// Populate the list with the updated data
for (int i=0; i<MyReaderData.TagList.TotalTags; i++)
{
string[] sItems = new string[]
{
i.ToString(),
MyReaderData.TagList[i].ToString(),
MyReaderData.TagList[i].ReadCount.ToString()
};
this.ReaderDataListView.Items.Add(new ListViewItem(sItems));
}
// Clear the flag so that the Taglist is maintained
ClearListFlag = false;
}
/// <summary>
/// Clears the Inventory list on the form and sets the flag to
/// start a new inventory.
/// </summary>
private void btnClearList_Click(object sender, System.EventArgs e)
{
// Clear the previous list
this.ReaderDataListView.Items.Clear();
// Set the flag to notify StartRead to start a new inventory
ClearListFlag = true;
}
/// <summary>
/// Exits the application.
/// </summary>
private void btnExit_Click(object sender, System.EventArgs e)
{
// Close this form
this.Close();
}
private void btnClearList_KeyDown(object sender, KeyEventArgs e)
{
// Checks if the key pressed was an enter button (character code 13)
if (e.KeyValue == (char)13)
btnClearList_Click(this, e);
}
private void btnExit_KeyDown(object sender, KeyEventArgs e)
{
// Checks if the key pressed was an enter button (character code 13)
if (e.KeyValue == (char)13)
btnExit_Click(this, e);
}
private void ReaderForm_KeyUp(object sender, KeyEventArgs e)
{
this.ReaderDataListView.Focus();
}
/// <summary>
/// Called when ReaderForm is activated
/// </summary>
private void ReaderForm_Activated(object sender, EventArgs e)
{
// Enable the trigger
if (this.MyReader != null)
this.MyReader.TriggerNotify += this.MyTriggerHandler;
}
/// <summary>
/// Called when ReaderForm is deactivated
/// </summary>
private void ReaderForm_Deactivate(object sender, EventArgs e)
{
// Disable the trigger
if (this.MyReader != null)
this.MyReader.TriggerNotify -= this.MyTriggerHandler;
}
private void ReaderForm_Resize(object sender, EventArgs e)
{
if (bInitialScale == true)
{
return; // Return if the initial scaling (from scratch)is not complete.
}
if (Screen.PrimaryScreen.Bounds.Width > Screen.PrimaryScreen.Bounds.Height) // If landscape orientation
{
if (bPortrait != false) // If an orientation change has occured to landscape
{
bPortrait = false; // Set the orientation flag accordingly.
bInitialScale = true; // An initial scaling is required due to orientation change.
Scale(this); // Scale the GUI.
}
else
{ // No orientation change has occured
bSkipMaxLen = true; // Initial scaling is now complete, so skipping the max. length restriction is now possible.
Scale(this); // Scale the GUI.
}
}
else
{
// Similarly for the portrait orientation...
if (bPortrait != true)
{
bPortrait = true;
bInitialScale = true;
Scale(this);
}
else
{
bSkipMaxLen = true;
Scale(this);
}
}
}
}
但是，设置间隔0并不能解决问题。并且通过按下“触发器”直到读取标签中的标签开始读取，标签读取20次以上。
答案 0 :(得分：2)
您必须更具体地了解您目前使用的资源和目标SDK平台。为了清楚起见，大多数EMDK都有一个版本号，并且取决于它和CF你使用的实现将有轻微或重大差异。 但是RFID标签阅读和列表过程的实现非常简单。
连接阅读器：
string hostName = "localhost
rfidReader = new RFIDReader(hostName, 0, 0);
try
{
rfidReader.Connect();
AccessComplete = new AutoResetEvent(false);
rfidReader.Events.NotifyInventoryStartEvent = true;
rfidReader.Events.NotifyAccessStartEvent = true;
rfidReader.Events.NotifyAccessStopEvent = true;
rfidReader.Events.NotifyInventoryStopEvent = true;
rfidReader.Events.NotifyAntennaEvent = true;
rfidReader.Events.NotifyBufferFullWarningEvent = true;
rfidReader.Events.NotifyBufferFullEvent = true;
rfidReader.Events.NotifyGPIEvent = true;
rfidReader.Events.NotifyReaderDisconnectEvent = true;
rfidReader.Events.NotifyReaderExceptionEvent = true;
rfidReader.Events.AttachTagDataWithReadEvent = false; //true if ReadNotify is ON
// Regitering for status event notification
rfidReader.Events.StatusNotify += new Events.StatusNotifyHandler(Events_StatusNotify);
// Exclude the events each other for best results in my case I use Status Notify only
//// Registering for read tag event notification
//rfidReader.Events.ReadNotify += new Events.ReadNotifyHandler(Events_ReadNotify);
}
catch (OperationFailureException operationFailureException)
{
// Handle this exception type
}
catch (Exception ex)
{
// Handle general exception type
}
然后使用Trigger按下和释放事件
执行清单 #region Postfilters
// Add postfilters if you need them
PostFilter posFilter = new PostFilter();
posFilter.UseRSSIRangeFilter = true;
posFilter.RssiRangeFilter.MatchRange = MATCH_RANGE.WITHIN_RANGE;
posFilter.RssiRangeFilter.PeakRSSILowerLimit = lowLimit;
posFilter.RssiRangeFilter.PeakRSSIUpperLimit = upLimit;
#endregion
#region TriggerInfo
// Control Inventory using Handheld Trigger Events
TriggerInfo triggerInfo = new TriggerInfo();
triggerInfo.TagReportTrigger = 0;
triggerInfo.StartTrigger.Type = START_TRIGGER_TYPE.START_TRIGGER_TYPE_HANDHELD;
triggerInfo.StartTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_PRESSED;
triggerInfo.StopTrigger.Type = STOP_TRIGGER_TYPE.STOP_TRIGGER_TYPE_HANDHELD_WITH_TIMEOUT;
triggerInfo.StopTrigger.Handheld.HandheldEvent = HANDHELD_TRIGGER_EVENT_TYPE.HANDHELD_TRIGGER_RELEASED;
triggerInfo.StopTrigger.Handheld.Timeout = 0;
#endregion
//Perform inventory
rfidReader.Actions.Inventory.Perform(posFilter, triggerInfo, null);
然后实施状态通知功能
private void Events_StatusNotify(object sender, Events.StatusEventArgs e)
{
if (e.StatusEventData.StatusEventType == Symbol.RFID3.Events.STATUS_EVENT_TYPE.INVENTORY_STOP_EVENT)
{
TagData[] inventoryTags = rfidReader.Actions.GetReadTags(5); // set number of tags you want to save
然后你有inventoryTags数组你需要的标签。
使用TagData属性在您的（例如TagID属性）
上列出它们最后取消订阅EventHandler并正确断开读卡器
rfidReader.Events.StatusNotify -= new Events.StatusNotifyHandler(Events_StatusNotify);
rfidReader.Disconnect();
就是这样
我希望这可能有所帮助