哪个大神告诉我这是表达的什么意思
[DllImport("USBIOX.dll")]
public static extern IntPtr USBIO_OpenDevice(uint iIndex);
[DllImport("USBIOX.dll")]
public static extern IntPtr USBIO_CloseDevice(uint iIndex);
[DllImport("USBIOX.dll")]
public static extern bool USBIO_SetStream(uint iIndex, uint imode);
[DllImport("USBIOX.dll")]
public static extern bool USBIO_WriteI2C(uint iIndex, byte idevice, byte iaddr, byte ibyte);
[DllImport("USBIOX.dll")]
public static extern bool USBIO_ReadI2C(uint iIndex, byte idevice, byte iaddr, byte[] ibyte);
[DllImport("USBIOX.dll")]
public static extern bool USBIO_StreamI2C(uint iIndex, uint writelength, byte[] writebuffer, uint readlength, byte[] readbuffer);

这些代码有什么用，我看不懂，表达了什么意思 通俗吧