Datasheet

 2011 Microchip Technology Inc. DS22228B-page 17
MCP2200
2.3.1.11 GetDeviceInfo
Function:
String^ SimpleIOClass::GetDeviceInfo (unsigned int uiDeviceNo)
EXAMPLE 2-11:
2.3.1.12 GetNoOfDevices
Function:
unsigned int SimpleIOClass::GetNoOfDevices(void)
EXAMPLE 2-12:
2.3.1.13 GetSelectedDevice
Function:
int SimpleIOClass::GetSelectedDevice(void)
Summary: Returns the path name for one of the connected devices.
Description: The function will return the path name for the given device ID.
Precondition: At least one call to the
InitMCP2200() is required in order to initiate a DLL search for the compatible
devices.
VID and PID must be previously set via a call to
InitMCP2200(VID, PID).
Parameters:
uiDeviceNo: The device ID for which the path information is needed. Can have a value between 0
and the number of devices minus 1.
Returns: This function returns a string containing the path name of the given device id.
• In the case the given ID is out of range, the function will return the “
Device Index Error” string.
• In the case the device for which the path name is required is not connected anymore, the return
string will be “
Device Not Connected”.
Remarks: None.
Summary: The function returns the number of available devices present in the system.
Description: The function returns the number of HID devices (with the given VID/PID) connected to the system.
Precondition: At least one call to the
InitMCP2200() is required in order to initiate a DLL search for the compatible
devices. Also, in order to know the actual number of devices connected to the system, call the
SimpleIOClass::IsConnected() function. VID and PID must be previously set via a call to
InitMCP2200(VID, PID).
Parameters: None.
Returns: This function returns the number of HID devices with the given VID/PID (as parameters of
SimpleIOClass::InitMCP2200() function).
Remarks: Call the SimpleIOClass::IsConnected() prior to the call of this function in order to have the most
recent number of devices that are present in the system.
Summary: Returns the ID of the selected device
Description: The function returns the ID of the current selected device.
Precondition: At least one call to the InitMCP2200() is required in order to initiate a DLL search for the compatible
devices. VID and PID must be previously set via a call to
InitMCP2200(VID, PID).
Parameters: None.
Returns: This function returns the ID of the current selected device. Its value can range from 0 to the number of
devices minus 1.
Remarks: None.
lblStatusBar->Text = SimpleIOClass::GetDeviceInfo(0);
SimpleIOClass::IsConnected(); //call this function to refresh the number of
//the devices present in the system
lblStatusBar->Text = SimpleIOClass::GetNoOfDevices();