[英]How to connect to the bluetooth low energy device
I am writing program for Win 8 tablet.我正在为 Win 8 平板电脑编写程序。 I need to connect an external BLE device.
我需要连接外部 BLE 设备。 The device is already paired with Windows and I can see it in Device Manager.
该设备已与 Windows 配对,我可以在设备管理器中看到它。 But I can not figure out how to connect it.
但我不知道如何连接它。
With SetupDiEnumDeviceInfo and SetupDiGetDeviceProperty I can get some information about the BLE-device, but to perform, eg BluetoothGATTGetServices Handle device requires.使用SetupDiEnumDeviceInfo和SetupDiGetDeviceProperty我可以获得有关 BLE 设备的一些信息,但要执行,例如BluetoothGATTGetServices Handle 设备需要。 I do not know where to take it.
我不知道该去哪里。 Perhaps i can use CreateFile , but it is not clear that the substitute as the first argument lpFileName.
也许我可以使用CreateFile ,但不清楚将替代作为第一个参数 lpFileName。
Here's a piece of code with which I'm looking for my device.这是我正在寻找我的设备的一段代码。
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(
&BluetoothClassGUID, /* GUID_DEVCLASS_BLUETOOTH */
0, 0, DIGCF_PRESENT);
if (hDevInfo == INVALID_HANDLE_VALUE)
{
// Insert error handling here.
return ;//1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_FRIENDLYNAME,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER){
// Change the buffer size.
if (buffer) delete(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = new wchar_t[buffersize * 2];
}else{
// Insert error handling here.
break;
}
}
/* Here i just compare by name is this my device or not */
...
/* Here i just compare by name is this my device or not */
if (buffer) delete(buffer);
}
if ( GetLastError()!=NO_ERROR &&
GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Insert error handling here.
return; //1;
}
// Cleanup
SetupDiDestroyDeviceInfoList(hDevInfo);
return;// 0;
I moved a little further, but still i can't get the data from device.我移动了一点,但我仍然无法从设备中获取数据。
To obtain "Device Interface Path" had to use the other functions: SetupDiGetClassDevs , SetupDiEnumDeviceInterfaces and SetupDiGetDeviceInterfaceDetail .要获得“设备接口路径”,必须使用其他函数: SetupDiGetClassDevs 、 SetupDiEnumDeviceInterfaces和SetupDiGetDeviceInterfaceDetail 。
Next, with CreateFile I get HANDLE BLE-device.接下来,使用CreateFile我得到 HANDLE BLE-device。
hComm = CreateFile(pInterfaceDetailData->DevicePath, GENERIC_WRITE | GENERIC_READ,NULL,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, NULL); hComm = CreateFile(pInterfaceDetailData->DevicePath, GENERIC_WRITE | GENERIC_READ,NULL,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, NULL);
Next using WinAPI BluetoothGATTGetServices and BluetoothGATTGetCharacteristics I get the appropriate structures.接下来使用 WinAPI BluetoothGATTGetServices和BluetoothGATTGetCharacteristics我得到了适当的结构。
But when trying to get the property value with BluetoothGATTGetCharacteristicsValue , I get ERROR_ACCESS_DENIED .但是当尝试使用BluetoothGATTGetCharacteristicsValue获取属性值时,我得到ERROR_ACCESS_DENIED 。
And then I do not know what to do.然后我不知道该怎么办。 What could be wrong?
有什么问题?
Andrey, I think the problem is that your device is not connected and BluetoothGATTGetCharacteristicsValue is not triggering a connection.
安德烈,我认为问题在于您的设备未连接并且BluetoothGATTGetCharacteristicsValue未触发连接。
Try manually to connect your device using Windows tools.尝试使用 Windows 工具手动连接您的设备。 I've the following flow that helps me: Unpair device, Pair device -> It should appear as connected ( it worked in my case ;) )
我有以下对我有帮助的流程:取消配对设备,配对设备->它应该显示为已连接(它在我的情况下有效;))
Anyway, If this is not helping, try to run "As Administrator", this helps in some cases.无论如何,如果这没有帮助,请尝试运行“以管理员身份”运行,这在某些情况下会有所帮助。
Good luck!!!祝你好运!!!
Note: Would be very interested to know how to retrievethe device path for the BTLE device in order to call BluetoothGATTGetServices?注意:想知道如何检索 BTLE 设备的设备路径以调用 BluetoothGATTGetServices?
gattServiceGUID is any long form BLE UUID supported by your device. gattServiceGUID 是您的设备支持的任何长格式 BLE UUID。
"{00001803-0000-1000-8000-00805F9B34FB"} can be used to open a handle to the Link Loss service if supported by the device you are trying to open
HDEVINFO hDevInfo = SetupDiGetClassDevs(&gattServiceGUID, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (hDevInfo != INVALID_HANDLE_VALUE)
{
SP_DEVICE_INTERFACE_DATA interfaceData;
ZeroMemory(&interfaceData,sizeof(SP_DEVICE_INTERFACE_DATA));
interfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
for (DWORD dwDeviceIndex = 0; SetupDiEnumDeviceInterfaces(hDevInfo, NULL, &gattServiceGUID, dwDeviceIndex, &interfaceData); dwDeviceIndex++)
{
dwDeviceCount++;
SetupDiGetDeviceInterfaceDetail(hDevInfo, &interfaceData, NULL, 0, &dwBytesNeeded, NULL);
if (::GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
pInterfaceDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) new byte[dwBytesNeeded];
SP_DEVINFO_DATA spDeviceInfoData = { sizeof(SP_DEVINFO_DATA) };
ZeroMemory(pInterfaceDetail, sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA));
pInterfaceDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
// grab the interface detail
if (SetupDiGetDeviceInterfaceDetail(hDevInfo, &interfaceData, pInterfaceDetail, dwBytesNeeded, NULL, &spDeviceInfoData) == TRUE)
{
// request a handle to the GATT service path
m_hGattServiceHandle = CreateFile(pInterfaceDetail->DevicePath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
if (m_hGattServiceHandle != INVALID_HANDLE_VALUE)
{
now you can drill down the characteristics and descriptors with the m_hGattServiceHandle
}
}
}
}
}
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