C#扫码枪读值
现在遇到问题：C#扫码枪如何读值？
求C#扫码枪读值的实例！谢谢！
邮箱1007109573@163.com C#?扫码枪?读值
[解决办法]
你说的是条码扫描设备吧，其实它就是一个键盘输入，你把它当键盘输入即可
[解决办法]
读取一个字符串的问题
[解决办法]
兩種方法：
1，把條碼槍當做鍵盤輸入設備，剩下就當做鍵盤輸入來考慮；
2，找到你所用的條碼槍提供的API，調用相關API獲取，可能涉及到WIN32的相關API。
[解决办法]
/*
Device開頭的都是PDA設備提供的API函數
Win32開頭的就是Win32相關API
這個設備是WIN CE 5.0系統
*/
public class DecodeEventArgs : EventArgs
{
private string barcode;
private byte type;
public DecodeEventArgs(string barcodeData, byte typeData)
{
barcode = barcodeData;
type = typeData;
}
public string Barcode
{
get { return barcode; }
set { barcode = value; }
}
public byte Type
{
get { return type; }
set { type = value; }
}
}
class Scanner
{
public event EventHandler<DecodeEventArgs> DecodeEvent;
private bool needClose = false;
private IntPtr[] hEvent = new IntPtr[2];
private IntPtr hNotify = IntPtr.Zero;
private Thread scanThread;
private bool isContinuousMode;
public bool IsContinuousMode
{
get { return isContinuousMode; }
set { isContinuousMode = value; }
}
public bool Start()
{
if (Device.SCA_GetPowerStatus() == 0)
{
Device.SCA_EnableModule();
needClose = true;
}
Win32.MSGQUEUEOPTIONS options = new Win32.MSGQUEUEOPTIONS();
options.dwSize = 20;
options.dwFlags = 2;
options.dwMaxMessages = 3;
options.cbMaxMessage = 252;
options.bReadAccess = true;
IntPtr hMsgQ = Win32.CreateMsgQueue(null, options);
if (hMsgQ == IntPtr.Zero)
{
return false;
}
hNotify = Device.SCA_RegisterNotification(hMsgQ);
if (hNotify == IntPtr.Zero)
{
return false;
}
hEvent[0] = Win32.CreateEvent(IntPtr.Zero, false, false, null);
hEvent[1] = hMsgQ;
scanThread = new Thread(new ThreadStart(this.ScanThreadPorc));
scanThread.Start();
return true;
}
public void Stop()
{
try
{
Win32.EventModify(hEvent[0], Win32.EVENT_SET);
if (!scanThread.Join(3000))
{
scanThread.Abort();
}
}
catch (Exception ex)
{
}
Win32.CloseHandle(hEvent[0]);
Device.SCA_UnRegisterNotification(hNotify);
Win32.CloseHandle(hEvent[1]);
if (needClose)
{
Device.SCA_DisableModule();
}
else if (isContinuousMode)
{
Device.SCA_SetTriggerMode(Device.TriggerMode.Normal);
}
}
private void ScanThreadPorc()
{
while (true)
{
uint evt = Win32.WaitForMultipleObjects(2, hEvent, false, Win32.INFINITE);
switch (evt)
{
case 0://return thread
return;
case 1://disable network
uint bytesRead;
uint flags;
byte[] buf = new byte[256];
if (Win32.ReadMsgQueue(hEvent[1], buf, 256, out bytesRead, Win32.INFINITE, out flags))
{
EventHandler<DecodeEventArgs> temp = DecodeEvent;
if (temp != null)
{
temp(this, new DecodeEventArgs(Encoding.Default.GetString(buf, 2, (int)bytesRead), buf[1]));
}
}
break;
}
}
}
}
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Scanner scanner = new Scanner();
private void Form1_Load(object sender, EventArgs e)
{
//判斷掃描槍頭是否打開,這裡是用的PDA的API函數
if (Device.SCA_GetPowerStatus() == 0)
{
Device.SCA_EnableModule();
}
txtBarCode.Focus();
scanner.DecodeEvent += new EventHandler<DecodeEventArgs>(scanner_DecodeEvent);
scanner.Start();
}
void scanner_DecodeEvent(object sender, DecodeEventArgs e)
{
this.BeginInvoke((Action<string>)delegate(string barcode)
{
txtBarCode.Text = barcode;
txtBarCode.Focus();
Win32.Keybd_event(0x0D, 0, 0, 0); //模擬鍵盤輸入一個回車
}, e.Barcode);
}
private void Form1_Closed(object sender, EventArgs e)
{
if (Device.SCA_GetPowerStatus() == 1)
{
Device.SCA_DisableModule();
}
scanner.Stop();
}
}
