private String GetDeviceId()
{
String deviceId = null;
Int32 bufferSize = 512;
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
Int32 errorCode = UsbDeviceWinApi.CM_Get_Device_ID(this.devInfoData.DevInst, buffer, bufferSize, 0);
if (UsbDeviceWinApi.ERROR_SUCCESS == errorCode)
{
deviceId = Marshal.PtrToStringAuto(buffer);
int slash = deviceId.LastIndexOf('\\');
if ((slash > 0) && (deviceId.LastIndexOf('-') > slash))
{
UInt32 devInstParent;
errorCode = UsbDeviceWinApi.CM_Get_Parent(out devInstParent, this.devInfoData.DevInst, 0);
if (UsbDeviceWinApi.ERROR_SUCCESS == errorCode)
{
errorCode = UsbDeviceWinApi.CM_Get_Device_ID(devInstParent, buffer, bufferSize, 0);
if (UsbDeviceWinApi.ERROR_SUCCESS == errorCode)
{
deviceId = Marshal.PtrToStringAuto(buffer);
}
else
{
this.TraceError("CM_Get_Device_ID", errorCode);
}
}
else
{
this.TraceError("CM_Get_Parent", errorCode);
}
}
}
else
{
this.TraceError("CM_Get_Device_ID", errorCode);
}
Marshal.FreeHGlobal(buffer);
return(deviceId);
}
private String GetDeviceId(UInt32 devInst)
{
Int32 bufferSize = 1024;
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
String deviceId = null;
Int32 errorCode = UsbDeviceWinApi.CM_Get_Device_ID(devInst, buffer, bufferSize, 0);
if (UsbDeviceWinApi.CR_SUCCESS == errorCode)
{
deviceId = Marshal.PtrToStringAuto(buffer);
}
else
{
this.TraceError("CM_Get_Device_ID", errorCode);
}
Marshal.FreeHGlobal(buffer);
return(deviceId);
}