private bool TryOpenUsb(string fileName)
{
try
{
_UsbApi = new UsbApi(fileName);
ExecuteCommand(ECommand.位);
//Query();
return(true);
}
catch
{
return(false);
}
}
public Usb()
{
foreach (var item in new string[] { "AP", "DB", "RS", "FC7", "FC4", "FC8" })
{
var data = new byte[item.Length + 7];
data[0] = 0x02; //stx
data[1] = 0x30; //addr H
data[2] = 0x30; //addr L
data[3] = 0x00; //len H
data[4] = (byte)item.Length; //len L
int index = 5;
foreach (var c in item)
{
data[index++] = (byte)c;
}
data[index++] = 0x03; //etx
data[index] = 0x02; //校验码
for (int i = 1; i < data.Length - 1; i++)
{
data[index] ^= data[i];
}
_CommandData.Add(data);
}
var fileName = Settings.Default.UsbFileName;
if (!string.IsNullOrEmpty(fileName) && TryOpenUsb(fileName))
{
return;
}
foreach (var fn in UsbApi.GetUsbFileNames())
{
if (TryOpenUsb(fn))
{
Settings.Default.UsbFileName = fn;
Settings.Default.Save();
return;
}
}
_UsbApi = null;
}
