I want to learn how to connect Bluetooth devices to my laptop and get information from them via C++. I kept running across the tutorial here online, so I thought I'd try to get it going to see how different stuff works.
Here is the code:
// If you have 1 or more bluetooth dongles attached to the system.
// this will select the first one, then it will perform a scan for
// all devices within range of that dongle and print out all the
// information available about each device. then move on to the next
// dongle and repeat the process, etc. doesn't actually DO much apart
// from find devices and display their information.
#include <stdlib.h>
#include <stdio.h>
// Link to ws2_32.lib
#include <Winsock2.h>
#include <Ws2bth.h>
// Link to Bthprops.lib
#include <BluetoothAPIs.h>
BLUETOOTH_FIND_RADIO_PARAMS m_bt_find_radio = { sizeof(BLUETOOTH_FIND_RADIO_PARAMS) };
BLUETOOTH_RADIO_INFO m_bt_info = { sizeof(BLUETOOTH_RADIO_INFO), 0, };
BLUETOOTH_DEVICE_SEARCH_PARAMS m_search_params = {
sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS),
1,
0,
1,
1,
1,
15,
NULL
};
BLUETOOTH_DEVICE_INFO m_device_info = { sizeof(BLUETOOTH_DEVICE_INFO), 0, };
// Note:
// Radio - is the thing plugged in/attached to the local machine.
// Device - is the thing that is connected to via the Bluetooth connection.
int main(int argc, char **args)
{
HANDLE m_radio = NULL;
HBLUETOOTH_RADIO_FIND m_bt = NULL;
HBLUETOOTH_DEVICE_FIND m_bt_dev = NULL;
int m_radio_id;
int m_device_id;
DWORD mbtinfo_ret;
// Iterate for available bluetooth radio devices in range
// Starting from the local
while (TRUE)
{
m_bt = BluetoothFindFirstRadio(&m_bt_find_radio, &m_radio);
if (m_bt != NULL)
printf("BluetoothFindFirstRadio() is OK!\n");
else
printf("BluetoothFindFirstRadio() failed with error code %d\n", GetLastError());
m_radio_id = 0;
do {
// Then get the radio device info....
mbtinfo_ret = BluetoothGetRadioInfo(m_radio, &m_bt_info);
if (mbtinfo_ret == ERROR_SUCCESS)
printf("BluetoothGetRadioInfo() looks fine!\n");
else
printf("BluetoothGetRadioInfo() failed wit herror code %d\n", mbtinfo_ret);
wprintf(L"Radio %d:\r\n", m_radio_id);
wprintf(L"\tInstance Name: %s\r\n", m_bt_info.szName);
wprintf(L"\tAddress: %02X:%02X:%02X:%02X:%02X:%02X\r\n", m_bt_info.address.rgBytes[5],
m_bt_info.address.rgBytes[4], m_bt_info.address.rgBytes[3], m_bt_info.address.rgBytes[2],
m_bt_info.address.rgBytes[1], m_bt_info.address.rgBytes[0]);
wprintf(L"\tClass: 0x%08x\r\n", m_bt_info.ulClassofDevice);
wprintf(L"\tManufacturer: 0x%04x\r\n", m_bt_info.manufacturer);
m_search_params.hRadio = m_radio;
ZeroMemory(&m_device_info, sizeof(BLUETOOTH_DEVICE_INFO));
m_device_info.dwSize = sizeof(BLUETOOTH_DEVICE_INFO);
// Next for every radio, get the device
m_bt_dev = BluetoothFindFirstDevice(&m_search_params, &m_device_info);
if (m_bt_dev != NULL)
printf("\nBluetoothFindFirstDevice() is working!\n");
else
printf("\nBluetoothFindFirstDevice() failed with error code %d\n", GetLastError());
m_radio_id++;
m_device_id = 0;
// Get the device info
do
{
wprintf(L"\n\tDevice %d:\r\n", m_device_id);
wprintf(L" \tInstance Name: %s\r\n", m_device_info.szName);
wprintf(L" \tAddress: %02X:%02X:%02X:%02X:%02X:%02X\r\n", m_device_info.Address.rgBytes[5],
m_device_info.Address.rgBytes[4], m_device_info.Address.rgBytes[3], m_device_info.Address.rgBytes[2],
m_device_info.Address.rgBytes[1], m_device_info.Address.rgBytes[0]);
wprintf(L" \tClass: 0x%08x\r\n", m_device_info.ulClassofDevice);
wprintf(L" \tConnected: %s\r\n", m_device_info.fConnected ? L"true" : L"false");
wprintf(L" \tAuthenticated: %s\r\n", m_device_info.fAuthenticated ? L"true" : L"false");
wprintf(L" \tRemembered: %s\r\n", m_device_info.fRemembered ? L"true" : L"false");
m_device_id++;
// Well, the found device information can be used for further socket
// operation such as creating a socket, bind, listen, connect, send, receive etc..
// If no more device, exit the loop
if (!BluetoothFindNextDevice(m_bt_dev, &m_device_info))
break;
} while (BluetoothFindNextDevice(m_bt_dev, &m_device_info));
// NO more device, close the device handle
if (BluetoothFindDeviceClose(m_bt_dev) == TRUE)
printf("\nBluetoothFindDeviceClose(m_bt_dev) is OK!\n");
else
printf("\nBluetoothFindDeviceClose(m_bt_dev) failed with error code %d\n", GetLastError());
} while (BluetoothFindNextRadio(&m_bt_find_radio, &m_radio));
// No more radio, close the radio handle
if (BluetoothFindRadioClose(m_bt) == TRUE)
printf("BluetoothFindRadioClose(m_bt) is OK!\n");
else
printf("BluetoothFindRadioClose(m_bt) failed with error code %d\n", GetLastError());
// Exit the outermost WHILE and BluetoothFindXXXXRadio loops if there is no more radio
if (!BluetoothFindNextRadio(&m_bt_find_radio, &m_radio))
break;
// Give some time for the 'signal' which is a typical for crap wireless devices
Sleep(1000);
}
return 0;
}
When I try to build and run the program, I get the following errors:
I can't figure out where the unresolved external errors are coming from. I read (here) that they usually come from having something declared but not initialized properly. I thought it possibly had something to do with needing to add the Winsock header files to my project, so I found the Winsock2 and Ws2bth header files and added them to my project but that didn't work either.
Then I thought it could be a library issue, so I went online to see if I could download Winsock libraries, but I could only find downloads for WinsockFix.
I am new to Bluetooth and Winsock. Can anyone tell me where I am going wrong with this whole setup and how I can fix it?
Note: I am using Visual Studio 2013 and trying to connect an Android phone to my laptop.
Thanks for any advice.
