我正在为Win 8平板电脑写程序。我需要连接一个外部BLE设备。该设备已与Windows配对,我可以在设备管理器中看到它。但我想不出怎么连接它。
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 device requires。我不知道去哪里买。也许我可以使用CreateFile,但不清楚作为第一个参数的替代参数是lpFileName。
这是一段代码,我用它来查找我的设备。
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;
我走得更远了一点,但我仍然无法从设备上获取数据。
要获得“设备接口路径”,必须使用其他函数:SetupDiGetClassDevs,SetupDiEnumDeviceInterfaces和SetupDiGetDeviceInterfaceDetail.
hComm = CreateFile(pInterfaceDetailData->DevicePath,GENERIC_WRITE | GENERIC_READ,NULL,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
获取适当的结构。
但是在尝试使用BluetoothGATTGetCharacteristicsValue,获取属性值时,我得到的是ERROR_ACCESS_DENIED.
然后我就不知道该怎么办了。会出什么问题呢?
发布于 2013-12-12 08:34:25
注意:我很想知道如何检索BTLE设备的设备路径以便调用BluetoothGATTGetServices?
gattServiceGUID是您的设备支持的任何长格式的BLE。
"{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
}
}
}
}
}
https://stackoverflow.com/questions/19808624
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