我有一个 TM-T20 Epson，我正在使用此代码尝试打印：“Hello Printer”消息，并且我一直在跟踪 PosPrinter 的一些特性：
public void ImprintHelloPrinter()
{
//The Explorer
PosExplorer explorer = new PosExplorer();
////Get the device by its type LOGICAL NAME
DeviceInfo device = explorer.GetDevice(DeviceType.PosPrinter, "T20PRINTER");
//Create an instance
PosPrinter oposPrinter = (PosPrinter)explorer.CreateInstance(device);
//Opening
MessageBox.Show(@"Statue : " + oposPrinter.State.ToString());
oposPrinter.Open();
MessageBox.Show(@"Statue : " + oposPrinter.State.ToString());
//Checking if its really the printer
MessageBox.Show(@"Description : " + oposPrinter.DeviceDescription);
MessageBox.Show(@"Check Claimed : " + oposPrinter.Claimed.ToString());
oposPrinter.Claim(10000); //Here is My Exception
//Enabeling device
oposPrinter.DeviceEnabled = true;
//normal print
oposPrinter.PrintNormal(PrinterStation.Receipt, "Hello Printer");
}
一切正常，我检查了它是否是正确的打印机，它打开并且没有声明，但是当我尝试声明它时，我有以下异常：
Method ClaimDevice threw an exception. Attempt was made to perform an illegal
or unsupported operation with the device, or an invalid parameter value was used.
即使在示例应用程序文件夹 ( C:\Program Files\Microsoft Point Of Service\SDK\Samples\Sample Application ) 中随Microsoft Point Of Service SDK提供的示例应用程序中，我也可以找到我的打印机，打开它，但是当我声称我有这个错误信息：
POSControlException ErrorCode(Illegal) ExtendedErrorCode(10002) occurred:
Method ClaimDevice threw an exception. Attempt was made to perform an illegal
or unsupported operation with the device, or an invalid parameter value was
used.
示例应用程序的打印屏幕：
