通过蓝牙将文件从PC传输到其他设备的代码示例c++

Question

Stackoverflow用户好!!

问题:

1. 我正在寻找一些代码示例，显示如何找到连接到我的计算机的蓝牙设备。
2. 我正在寻找一些代码示例，显示如何将信息从我的计算机传输到移动设备。

现在我正试图在c++上开发必须与蓝牙设备一起工作的应用程序。当我通过互联网进行研究时，我发现了一些关于蓝牙的信息，并找到了一些演示如何使用蓝牙设备的代码示例。例如，这里我找到了指示如何在所有蓝牙无线电范围内查找所有蓝牙设备的代码:

#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:rn", m_radio_id);
      wprintf(L"tName: %srn", m_bt_info.szName);
      wprintf(L"tAddress: %02x:%02x:%02x:%02x:%02x:%02xrn", 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%08xrn", m_bt_info.ulClassofDevice);
      wprintf(L"tManufacturer: 0x%04xrn", 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:rn", m_device_id);
        wprintf(L"ttName: %srn", m_device_info.szName);
        wprintf(L"ttAddress: %02x:%02x:%02x:%02x:%02x:%02xrn", 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"ttClass: 0x%08xrn", m_device_info.ulClassofDevice);
        wprintf(L"ttConnected: %srn", m_device_info.fConnected ? L"true" : L"false");
        wprintf(L"ttAuthenticated: %srn", m_device_info.fAuthenticated ? L"true" : L"false");
        wprintf(L"ttRemembered: %srn", 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;
}

我创建了一个项目，并在我的笔记本上运行它，启用了蓝牙，但没有结果出现，就好像应用程序找不到任何蓝牙设备一样。在我继续我的研究之后，发现了另一篇文章在Windows XP中使用c++查找蓝牙设备和服务

#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 servicesn";
                //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;     
}

当我编译这个并启动应用程序时出现错误消息"初始化查找设备时发生错误，关闭......"

任何想法?

Answer 1

尝试查看此链接，

它可能对你有用…:)

Answer 2

这是一个老问题，但我觉得我有必要为之后观看的8k人回答这个问题。

queryset结构错误，这就是wsalookupbegin失败的原因

queryset.lpcsaBuffer = NULL;

将this添加到struct中可以使它工作;然后使用wsalookupbegin返回句柄;然后传递wsalookupnext的句柄，然后根据您的标志获得所需的结果。