Hi Stackoverflow Users !!!
Questions:
- I am looking for some code examples which show how can I find Bluetooth devices that are connected to my computer.
- I am looking for some code examples which show how can I transfer information from my computer to a mobile device.
Now I am trying to develop application on C++ which must work with Bluetooth devices. While I was researching through internet I found some information about Bluetooth and I found some code examples witch present how can work with Bluetooth devices. For example here I found code witch presents how can use find all bluetooth devices within range of all bluetooth radios:
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <bthdef.h>
#include <BluetoothAPIs.h>
#pragma comment(lib, "Irprops.lib")
// The BLUETOOTH_FIND_RADIO_PARAMS structure facilitates
// enumerating installed Bluetooth radios.
BLUETOOTH_FIND_RADIO_PARAMS m_bt_find_radio = {
sizeof(BLUETOOTH_FIND_RADIO_PARAMS)
};
// The BLUETOOTH_RADIO_INFO structure contains information
// about a Bluetooth radio.
BLUETOOTH_RADIO_INFO m_bt_info = {
sizeof(BLUETOOTH_RADIO_INFO),
0,
};
// The BLUETOOTH_DEVICE_SEARCH_PARAMS structure specifies
// search criteria for Bluetooth device searches.
BLUETOOTH_DEVICE_SEARCH_PARAMS m_search_params = {
sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS),
1,
0,
1,
1,
1,
15,
NULL
};
// The BLUETOOTH_DEVICE_INFO structure provides information
// about a Bluetooth device.
BLUETOOTH_DEVICE_INFO m_device_info = {
sizeof(BLUETOOTH_DEVICE_INFO),
0,
};
HANDLE m_radio = NULL;
HBLUETOOTH_RADIO_FIND m_bt = NULL;
HBLUETOOTH_DEVICE_FIND m_bt_dev = NULL;
int wmain(int argc, wchar_t **args) {
while(true) {
// The BluetoothFindFirstRadio function begins the
// enumeration of local Bluetooth radios.
m_bt = BluetoothFindFirstRadio(&m_bt_find_radio, &m_radio);
int m_radio_id = 0;
do {
m_radio_id++;
// The BluetoothGetRadioInfo function obtains information
// about a Bluetooth radio.
BluetoothGetRadioInfo(m_radio, &m_bt_info);
wprintf(L"Radio %d:\r\n", m_radio_id);
wprintf(L"\tName: %s\r\n", m_bt_info.szName);
wprintf(L"\tAddress: %02x:%02x:%02x:%02x:%02x:%02x\r\n", m_bt_info.address.rgBytes[1], m_bt_info.address.rgBytes[0], m_bt_info.address.rgBytes[2], m_bt_info.address.rgBytes[3], m_bt_info.address.rgBytes[4], m_bt_info.address.rgBytes[5]);
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);
m_bt_dev = BluetoothFindFirstDevice(&m_search_params, &m_device_info);
int m_device_id = 0;
do {
m_device_id++;
wprintf(L"\tDevice %d:\r\n", m_device_id);
wprintf(L"\t\tName: %s\r\n", m_device_info.szName);
wprintf(L"\t\tAddress: %02x:%02x:%02x:%02x:%02x:%02x\r\n", m_device_info.Address.rgBytes[1], m_device_info.Address.rgBytes[0], m_device_info.Address.rgBytes[2], m_device_info.Address.rgBytes[3], m_device_info.Address.rgBytes[4], m_device_info.Address.rgBytes[5]);
wprintf(L"\t\tClass: 0x%08x\r\n", m_device_info.ulClassofDevice);
wprintf(L"\t\tConnected: %s\r\n", m_device_info.fConnected ? L"true" : L"false");
wprintf(L"\t\tAuthenticated: %s\r\n", m_device_info.fAuthenticated ? L"true" : L"false");
wprintf(L"\t\tRemembered: %s\r\n", m_device_info.fRemembered ? L"true" : L"false");
} while(BluetoothFindNextDevice(m_bt_dev, &m_device_info));
BluetoothFindDeviceClose(m_bt_dev);
} while(BluetoothFindNextRadio(&m_bt_find_radio, &m_radio));
BluetoothFindRadioClose(m_bt);
Sleep(10000);
}
return 0;
}
Then I create project and run it on my notebook with turned on Bluetooth no result appear. As if the application can’t find any Bluetooth device. After I continued my research and found other article called Finding Bluetooth devices and services using C++ in Windows XP
#include <winsock2.h>
#include <ws2bth.h>
#include <BluetoothAPIs.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "irprops.lib")
using namespace std;
int main(){
//Initialising winsock
WSADATA data;
int result;
result = WSAStartup(MAKEWORD(2, 2), &data);//initializing winsock
if (result!=0) {
cout << "An error occured while initialising winsock, closing....";
exit(result);
}
//Initialising query for device
WSAQUERYSET queryset;
memset(&queryset, 0, sizeof(WSAQUERYSET));
queryset.dwSize = sizeof(WSAQUERYSET);
queryset.dwNameSpace = NS_BTH;
HANDLE hLookup;
result = WSALookupServiceBegin(&queryset, LUP_CONTAINERS, &hLookup);
if (result!=0){
cout << "An error occured while initialising look for devices, closing....";
Sleep(100000);
exit(result);
}
//Initialisation succedd, start looking for devices
BYTE buffer[4096];
memset(buffer, 0, sizeof(buffer));
DWORD bufferLength = sizeof(buffer);
WSAQUERYSET *pResults = (WSAQUERYSET*)&buffer;
while (result==0){
result = WSALookupServiceNext(hLookup, LUP_RETURN_NAME | LUP_CONTAINERS | LUP_RETURN_ADDR | LUP_FLUSHCACHE | LUP_RETURN_TYPE | LUP_RETURN_BLOB | LUP_RES_SERVICE,&bufferLength, pResults);
if(result==0){// A device found
//print the name of the device
LPTSTR s = pResults->lpszServiceInstanceName;
wcout << s << "found. quering for services\n";
//Initialise quering the device services
WSAQUERYSET queryset2;
memset(&queryset2, 0, sizeof(queryset2));
queryset2.dwSize = sizeof(queryset2);
queryset2.dwNameSpace = NS_BTH;
queryset2.dwNumberOfCsAddrs = 0;
CSADDR_INFO * addr = (CSADDR_INFO *)pResults->lpcsaBuffer;
WCHAR addressAsString[1000];
DWORD addressSize = sizeof(addressAsString);
WSAAddressToString(addr->RemoteAddr.lpSockaddr,addr->RemoteAddr.iSockaddrLength,NULL,addressAsString, &addressSize);
queryset2.lpszContext = addressAsString;
GUID protocol = L2CAP_PROTOCOL_UUID;
queryset2.lpServiceClassId = &protocol;
HANDLE hLookup2;
int result2 = WSALookupServiceBegin(&queryset2, LUP_FLUSHCACHE |LUP_RETURN_NAME | LUP_RETURN_TYPE | LUP_RETURN_ADDR | LUP_RETURN_BLOB | LUP_RETURN_COMMENT, &hLookup2);
if (result2 !=0){
cout << "An error occured while initializing query for services";
Sleep(100000);
exit(result);
}
//Start quering for device services
while(result2 ==0){
BYTE buffer2[4096];
memset(buffer2, 0, sizeof(buffer2));
DWORD bufferLength2 = sizeof(buffer2);
WSAQUERYSET *pResults2 = (WSAQUERYSET*)&buffer2;
result2 = WSALookupServiceNext(hLookup2,LUP_FLUSHCACHE |LUP_RETURN_NAME | LUP_RETURN_TYPE | LUP_RETURN_ADDR | LUP_RETURN_BLOB | LUP_RETURN_COMMENT,&bufferLength2,pResults2);
if(result2 == 0)
wcout << "Service found: " << pResults2->lpszServiceInstanceName <<"\n";
Sleep(100000);
}
}
}
Sleep(100000);
return 0;
}
When I compile this one and launch application error message appears”An error occurred while initializing look for devices, closing ……” !!!
If you can give me information any article, code example or something else with helps me in my research I will be very pleased and thanks to you !!!
Best Regards !!!
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