Is there any way to pair Bluetooth device in Windows programmatically - windows

Question

there's a question:
Is there any way to pair Bluetooth device in Windows programmatically? (c++, c#)
thanks for replies

Answer 1

Yes, the reference documentation is available on MSDN.
32feet.NET is a C# wrapper, available here. Information on pairing is here.

Answer 2

Python is a tempting and overall easy solution, but PyBlueZ does not expose the windows Bluetooth authentication APIs here: https://msdn.microsoft.com/en-us/library/windows/desktop/cc766819(v=vs.85).aspx
One way to get around this is to create a command line tool and use this through Python. To create command line tools for Windows, use Visual Studio and add the necessary libraries to your project linker properties: Bthprops.lib and ws2_32.lib
Below is the code for a project to make a command line tool with 1 parameter, the MAC address, that pairs the specified device using "Just Works" pairing. See commented code for using passkey pairing.
#include "stdafx.h"
#include <initguid.h>
#include <winsock2.h>
#include <BluetoothAPIs.h>
#include <ws2bth.h>
BOOL WINAPI BluetoothAuthCallback(LPVOID pvParam, PBLUETOOTH_AUTHENTICATION_CALLBACK_PARAMS pAuthCallbackParams);
int _tmain(int argc, _TCHAR* argv[])
{
SOCKADDR_BTH sa = { 0 };
int sa_len = sizeof(sa);
DWORD dwRet;
BLUETOOTH_DEVICE_INFO btdi = { 0 };
HBLUETOOTH_AUTHENTICATION_REGISTRATION hRegHandle = 0;
// initialize windows sockets
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(2, 0);
if (WSAStartup(wVersionRequested, &wsaData) != 0) {
ExitProcess(2);
}
// parse the specified Bluetooth address
if (argc < 2) {
fprintf(stderr, "usage: csbtpair <addr>\n"
"\n addr must be in the form (XX:XX:XX:XX:XX:XX)");
ExitProcess(2);
}
if (SOCKET_ERROR == WSAStringToAddress(argv[1], AF_BTH,
NULL, (LPSOCKADDR)&sa, &sa_len)) {
ExitProcess(2);
}
// setup device info
btdi.dwSize = sizeof(BLUETOOTH_DEVICE_INFO);
btdi.Address.ullLong = sa.btAddr;
btdi.ulClassofDevice = 0;
btdi.fConnected = false;
btdi.fRemembered = false;
btdi.fAuthenticated = false;
// register authentication callback. this prevents UI from showing up.
dwRet = BluetoothRegisterForAuthenticationEx(&btdi, &hRegHandle, &BluetoothAuthCallback, NULL);
if (dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothRegisterForAuthenticationEx ret %d\n", dwRet);
ExitProcess(2);
}
// authenticate device (will call authentication callback)
AUTHENTICATION_REQUIREMENTS authreqs = MITMProtectionNotRequired;
fprintf(stderr, "BluetoothAuthReqs = %d\n", authreqs);
dwRet = BluetoothAuthenticateDeviceEx(NULL, NULL, &btdi, NULL, authreqs);
if (dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothAuthenticateDevice ret %d\n", dwRet);
if (dwRet == ERROR_CANCELLED)
{
fprintf(stderr, "Cancelled");
}
else if (dwRet == ERROR_INVALID_PARAMETER)
{
fprintf(stderr, "Invalid Parameter");
}
else if (dwRet == ERROR_NO_MORE_ITEMS)
{
fprintf(stderr, "Already paired!");
}
}
fprintf(stderr, "pairing finish\n");
ExitProcess(0);
return 0;
}
// Authentication callback
BOOL WINAPI BluetoothAuthCallback(LPVOID pvParam, PBLUETOOTH_AUTHENTICATION_CALLBACK_PARAMS pAuthCallbackParams)
{
DWORD dwRet;
fprintf(stderr, "BluetoothAuthCallback 0x%x\n", pAuthCallbackParams->deviceInfo.Address.ullLong);
BLUETOOTH_AUTHENTICATE_RESPONSE AuthRes;
AuthRes.authMethod = pAuthCallbackParams->authenticationMethod;
fprintf(stderr, "Authmethod %d\n", AuthRes.authMethod);
// Check to make sure we are using numeric comparison (Just Works)
if (AuthRes.authMethod == BLUETOOTH_AUTHENTICATION_METHOD_NUMERIC_COMPARISON)
{
fprintf(stderr, "Numeric Comparison supported\n");
}
AuthRes.bthAddressRemote = pAuthCallbackParams->deviceInfo.Address;
AuthRes.negativeResponse = FALSE;
// Commented out code is used for pairing using the BLUETOOTH_AUTHENTICATION_METHOD_PASSKEY method
//memcpy_s(AuthRes.pinInfo.pin, sizeof(AuthRes.pinInfo.pin), L"1234", 0);
//AuthRes.pinInfo.pinLength = 0;
// Respond with numerical value for Just Works pairing
AuthRes.numericCompInfo.NumericValue = 1;
// Send authentication response to authenticate device
dwRet = BluetoothSendAuthenticationResponseEx(NULL, &AuthRes);
if (dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothSendAuthenticationResponseEx ret %d\n", dwRet);
if (dwRet == ERROR_CANCELLED)
{
fprintf(stderr, "Bluetooth device denied passkey response or communicatino problem.\n");
}
else if (dwRet == E_FAIL)
{
fprintf(stderr, "Device returned a failure code during authentication.\n");
}
else if (dwRet == 1244)
{
fprintf(stderr, "Not authenticated\n");
}
}
else
{
fprintf(stderr, "BluetoothAuthCallback finish\n");
}
return 1; // This value is ignored
}
In lieu of creating this yourself, you may want to try this pre-made solution:
http://bluetoothinstaller.com/bluetooth-command-line-tools/
It did not work for my particular solution.
Then, you will need to run your downloaded or custom command line tool from python as an administrator. To do this reliably, I recommend the stackoverflow question:
How to run python script with elevated privilege on windows

Answer 3

I meet the same problem,and I have resolved the problem, Maybe you can try it:
make a windows tool named pairtool.exe, it help you to pairing with command line. the key api is BluetoothAuthenticateDevice, please refering the functions document
dwRet = BluetoothAuthenticateDevice(NULL, NULL, &btdi, L"1234", 4);
if(dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothAuthenticateDevice ret %d\n", dwRet);
ExitProcess(2);
}
python code:
def connect2Btdev(devName):
#found the device addr
addr = inquiry(devName)
if addr == None:
return None
#pairing with pairtool.exe
cmd=r'%s %s' % ('pairtool.exe',addr)
ret = os.system(cmd)
if ret <> 0:
return None
here is all the code of pairtool.exe:
#include "stdafx.h"
#include <initguid.h>
#include <winsock2.h>
#include <BluetoothAPIs.h>
#include <ws2bth.h>
bool BluetoothAuthCallback(LPVOID pvParam, PBLUETOOTH_AUTHENTICATION_CALLBACK_PARAMS pAuthCallbackParams)
{
DWORD dwRet;
fprintf(stderr, "BluetoothAuthCallback 0x%x\n", pAuthCallbackParams->deviceInfo.Address.ullLong);
dwRet = BluetoothSendAuthenticationResponse(NULL, &(pAuthCallbackParams->deviceInfo), L"1234");
if(dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothSendAuthenticationResponse ret %d\n", dwRet);
ExitProcess(2);
return 1;
}
fprintf(stderr, "BluetoothAuthCallback finish\n");
ExitProcess(0);
return 1;
}
int _tmain(int argc, _TCHAR* argv[])
{
SOCKADDR_BTH sa = { 0 };
int sa_len = sizeof(sa);
DWORD dwRet;
BLUETOOTH_DEVICE_INFO btdi = {0};
HBLUETOOTH_AUTHENTICATION_REGISTRATION hRegHandle = 0;
// initialize windows sockets
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD( 2, 0 );
if( WSAStartup( wVersionRequested, &wsaData ) != 0 ) {
ExitProcess(2);
}
// parse the specified Bluetooth address
if( argc < 2 ) {
fprintf(stderr, "usage: rfcomm-client <addr>\n"
"\n addr must be in the form (XX:XX:XX:XX:XX:XX)");
ExitProcess(2);
}
if( SOCKET_ERROR == WSAStringToAddress( argv[1], AF_BTH,
NULL, (LPSOCKADDR) &sa, &sa_len ) ) {
ExitProcess(2);
}
//注册回调函数
btdi.dwSize = sizeof(BLUETOOTH_DEVICE_INFO);
btdi.Address.ullLong = sa.btAddr;
btdi.ulClassofDevice = 0;
btdi.fConnected = false;
btdi.fRemembered = false;
btdi.fAuthenticated = false;
dwRet = BluetoothRegisterForAuthenticationEx(&btdi, &hRegHandle, &BluetoothAuthCallback, NULL);
if(dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothRegisterForAuthenticationEx ret %d\n", dwRet);
ExitProcess(2);
}
dwRet = BluetoothAuthenticateDevice(NULL, NULL, &btdi, L"1234", 4);
if(dwRet != ERROR_SUCCESS)
{
fprintf(stderr, "BluetoothAuthenticateDevice ret %d\n", dwRet);
ExitProcess(2);
}
Sleep(1000);
fprintf(stderr, "pairing finish\n");
ExitProcess(0);
return 0;
}

Answer 4

Microsoft has introduced Windows.Devices.Enumeration API available for UWP and traditional applications, which makes pairing of bluetooth devices very easy (for details look at the official C# and C++ example). As far as I understand it is the API which is used by built-in "Bluetooth & other devices" UI dialog. As of an example of what console utility you can write using this API you can take a look at my console BluetoothDevicePairing utility.

Answer 5

You can do so by using the functions documented under MSDN Bluetooth Functions.
These enable searching and pairing of bluetooth devices programmatically.