windows 蓝牙连接通信代码

以下是 Windows SDK 中的蓝牙连接通信示例代码：

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <ws2bth.h>
#include <bthsdpdef.h>
#include <bluetoothapis.h>

#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "irprops.lib")

#define BUFFER_SIZE 1024

void DisplayBthAddr(__in_bcount(sizeof(BTH_ADDR)) BTH_ADDR bthAddr)
{
	printf("%02X:%02X:%02X:%02X:%02X:%02X\n",
		(unsigned char)(bthAddr >> (5 * 8)),
		(unsigned char)(bthAddr >> (4 * 8)),
		(unsigned char)(bthAddr >> (3 * 8)),
		(unsigned char)(bthAddr >> (2 * 8)),
		(unsigned char)(bthAddr >> (1 * 8)),
		(unsigned char)(bthAddr >> (0 * 8)));
}

int main(int argc, char* argv[])
{
	WSADATA wsd;
	BLUETOOTH_DEVICE_SEARCH_PARAMS searchParams = { 0 };
	BLUETOOTH_DEVICE_INFO deviceInfo = { 0 };
	BLUETOOTH_FIND_RADIO_PARAMS btRadioParam = { sizeof(BLUETOOTH_FIND_RADIO_PARAMS) };
	HBLUETOOTH_RADIO_FIND hRadioFind;
	HBLUETOOTH_DEVICE_FIND hFind;
	BOOL bRet = FALSE;
	HANDLE hRadio = NULL;
	SOCKET clientSocket = INVALID_SOCKET;
	SOCKADDR_BTH clientAddr = { 0 };
	WSAQUERYSET wsaQuerySet = { 0 };
	LPWSAQUERYSET pwsaResults = NULL;
	HANDLE hLookup = NULL;
	DWORD dwSize;
	CHAR szName[256];
	CHAR szBuffer[BUFFER_SIZE];
	WSABUF wsaBuffer;
	DWORD dwBytesReceived;
	DWORD dwFlags = 0;

	// Initialize Winsock
	if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
	{
		printf("WSAStartup failed: %d\n", GetLastError());
		return 1;
	}

	// Find local Bluetooth radio
	hRadioFind = BluetoothFindFirstRadio(&btRadioParam, &hRadio);
	if (hRadioFind == NULL)
	{
		printf("BluetoothFindFirstRadio failed: %d\n", GetLastError());
		return 1;
	}

	// Find Bluetooth devices
	searchParams.dwSize = sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS);
	searchParams.fReturnAuthenticated = TRUE;
	searchParams.fReturnRemembered = TRUE;
	searchParams.fReturnUnknown = TRUE;
	searchParams.fReturnConnected = TRUE;
	searchParams.fIssueInquiry = TRUE;
	searchParams.cTimeoutMultiplier = 5;
	searchParams.hRadio = hRadio;

	hFind = BluetoothFindFirstDevice(&searchParams, &deviceInfo);
	if (hFind == NULL)
	{
		printf("BluetoothFindFirstDevice failed: %d\n", GetLastError());
		return 1;
	}

	do
	{
		printf("Device found: ");
		DisplayBthAddr(deviceInfo.Address);

		if (deviceInfo.fRemembered)
			printf("\tRemembered\n");

		if (deviceInfo.fAuthenticated)
			printf("\tAuthenticated\n");

		if (deviceInfo.fConnected)
			printf("\tConnected\n");

		wsaQuerySet.dwSize = sizeof(WSAQUERYSET);
		wsaQuerySet.dwNameSpace = NS_BTH;
		wsaQuerySet.lpServiceClassId = (LPGUID)&GUID_BLUETOOTH_SPP_SERVICE_CLASS;
		wsaQuerySet.lpszContext = deviceInfo.szName;

		if (WSALookupServiceBegin(&wsaQuerySet, LUP_CONTAINERS | LUP_FLUSHCACHE, &hLookup) == SOCKET_ERROR)
		{
			printf("WSALookupServiceBegin failed: %d\n", WSAGetLastError());
			continue;
		}

		dwSize = sizeof(WSAQUERYSET);

		if (WSALookupServiceNext(hLookup, LUP_RETURN_NAME | LUP_RETURN_ADDR, &dwSize, pwsaResults) == 0)
		{
			BTH_DEVICE_INFO deviceInfo;
			memset(&deviceInfo, 0, sizeof(deviceInfo));
			deviceInfo.dwSize = sizeof(deviceInfo);

			if (BluetoothGetDeviceInfo(hRadio, &deviceInfo) == ERROR_SUCCESS)
			{
				printf("\tDevice Name: %s\n", pwsaResults->lpszServiceInstanceName);
				printf("\tDevice Class: 0x%08x\n", deviceInfo.ulClassofDevice);
			}

			// Connect to the device
			clientSocket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
			if (clientSocket == INVALID_SOCKET)
			{
				printf("socket creation failed: %d\n", WSAGetLastError());
				continue;
			}

			clientAddr.addressFamily = AF_BTH;
			clientAddr.btAddr = deviceInfo.Address;
			clientAddr.serviceClassId = GUID_BLUETOOTH_SPP_SERVICE_CLASS;
			clientAddr.port = 1; // SPP service port number

			if (connect(clientSocket, (SOCKADDR*)&clientAddr, sizeof(clientAddr)) == SOCKET_ERROR)
			{
				printf("connect failed: %d\n", WSAGetLastError());
				closesocket(clientSocket);
				continue;
			}

			// Send data to the device
			strcpy_s(szBuffer, "Hello Bluetooth!");
			wsaBuffer.buf = szBuffer;
			wsaBuffer.len = strlen(szBuffer) + 1;

			if (WSASend(clientSocket, &wsaBuffer, 1, &dwBytesReceived, dwFlags, NULL, NULL) == SOCKET_ERROR)
			{
				printf("WSASend failed: %d\n", WSAGetLastError());
				closesocket(clientSocket);
				continue;
			}

			// Receive data from the device
			dwBytesReceived = 0;
			memset(szBuffer, 0, BUFFER_SIZE);
			wsaBuffer.buf = szBuffer;
			wsaBuffer.len = BUFFER_SIZE;

			if (WSARecv(clientSocket, &wsaBuffer, 1, &dwBytesReceived, &dwFlags, NULL, NULL) == SOCKET_ERROR)
			{
				printf("WSARecv failed: %d\n", WSAGetLastError());
				closesocket(clientSocket);
				continue;
			}

			printf("Received data: %s\n", szBuffer);

			// Close the connection
			closesocket(clientSocket);
		}

		WSALookupServiceEnd(hLookup);
	} while (BluetoothFindNextDevice(hFind, &deviceInfo));

	BluetoothFindDeviceClose(hFind);

	BluetoothFindRadioClose(hRadioFind);

	WSACleanup();

	return 0;
}

这个示例代码使用了 Windows Socket API 和 Bluetooth API 来搜索和连接到一个蓝牙设备，并发送和接收数据。注意，这里使用了 Bluetooth SPP service class 的端口号 1，你需要确保你的蓝牙设备支持该服务端口号。