I am trying to write a Win32 console application that will connect iPhone Bluetooth for some BLE services. Please correct me if I am making any mistake here-
Getting Access violation error at -
hr = BluetoothGATTGetCharacteristics(
hLEDevice,
pServiceBuffer,
0,
NULL,
&charBufferSize,
BLUETOOTH_GATT_FLAG_NONE);
The reason is, I am not able to loop through - SetupDiEnumDeviceInterfaces
for this device classId.
Main function for more detail-
#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>
#include <bthdef.h>
#include <Bluetoothleapis.h>
#pragma comment(lib, "SetupAPI")
#pragma comment(lib, "BluetoothApis.lib")
HANDLE GetBLEHandle(__in GUID AGuid)
{
HDEVINFO hDI;
SP_DEVICE_INTERFACE_DATA did;
SP_DEVINFO_DATA dd;
GUID BluetoothInterfaceGUID = AGuid;
HANDLE hComm = NULL;
hDI = SetupDiGetClassDevs(&BluetoothInterfaceGUID, NULL, NULL, DIGCF_DEVICEINTERFACE | DIGCF_PRESENT);
if (hDI == INVALID_HANDLE_VALUE) return NULL;
did.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
dd.cbSize = sizeof(SP_DEVINFO_DATA);
for (DWORD i = 0; SetupDiEnumDeviceInterfaces(hDI, NULL, &BluetoothInterfaceGUID, i, &did); i++)
{
SP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceDetailData;
DeviceInterfaceDetailData.cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
DWORD size = 0;
if (!SetupDiGetDeviceInterfaceDetail(hDI, &did, NULL, 0, &size, 0))
{
int err = GetLastError();
if (err == ERROR_NO_MORE_ITEMS) break;
PSP_DEVICE_INTERFACE_DETAIL_DATA pInterfaceDetailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)GlobalAlloc(GPTR, size);
pInterfaceDetailData->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
if (!SetupDiGetDeviceInterfaceDetail(hDI, &did, pInterfaceDetailData, size, &size, &dd))
break;
hComm = CreateFile(
pInterfaceDetailData->DevicePath,
GENERIC_WRITE | GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
0,
NULL);
GlobalFree(pInterfaceDetailData);
}
}
SetupDiDestroyDeviceInfoList(hDI);
return hComm;
}
int main(int argc, char *argv[], char *envp[]){
GUID AGuid = GUID_DEVCLASS_BLUETOOTH;
//now get the handle
HANDLE hLEDevice = GetBLEHandle(AGuid);
//Step 2: Get a list of services that the device advertises
// first send 0,NULL as the parameters to BluetoothGATTServices inorder to get the number of
// services in serviceBufferCount
USHORT serviceBufferCount;
////////////////////////////////////////////////////////////////////////////
// Determine Services Buffer Size
////////////////////////////////////////////////////////////////////////////
HRESULT hr = BluetoothGATTGetServices(
hLEDevice,
0,
NULL,
&serviceBufferCount,
BLUETOOTH_GATT_FLAG_NONE);
if (HRESULT_FROM_WIN32(ERROR_MORE_DATA) != hr) {
printf("BluetoothGATTGetServices - Buffer Size %d", hr);
}
PBTH_LE_GATT_SERVICE pServiceBuffer = (PBTH_LE_GATT_SERVICE)
malloc(sizeof(BTH_LE_GATT_SERVICE) * serviceBufferCount);
if (NULL == pServiceBuffer) {
printf("pServiceBuffer out of memory\r\n");
}
else {
RtlZeroMemory(pServiceBuffer,
sizeof(BTH_LE_GATT_SERVICE) * serviceBufferCount);
}
////////////////////////////////////////////////////////////////////////////
// Retrieve Services
////////////////////////////////////////////////////////////////////////////
USHORT numServices;
hr = BluetoothGATTGetServices(
hLEDevice,
serviceBufferCount,
pServiceBuffer,
&numServices,
BLUETOOTH_GATT_FLAG_NONE);
if (S_OK != hr) {
printf("BluetoothGATTGetServices - Buffer Size %d", hr);
}
//Step 3: now get the list of charactersitics. note how the pServiceBuffer is required from step 2
////////////////////////////////////////////////////////////////////////////
// Determine Characteristic Buffer Size
////////////////////////////////////////////////////////////////////////////
USHORT charBufferSize;
hr = BluetoothGATTGetCharacteristics(
hLEDevice,
pServiceBuffer,
0,
NULL,
&charBufferSize,
BLUETOOTH_GATT_FLAG_NONE);
if (HRESULT_FROM_WIN32(ERROR_MORE_DATA) != hr) {
printf("BluetoothGATTGetCharacteristics - Buffer Size %d", hr);
}
PBTH_LE_GATT_CHARACTERISTIC pCharBuffer;
if (charBufferSize > 0) {
pCharBuffer = (PBTH_LE_GATT_CHARACTERISTIC)
malloc(charBufferSize * sizeof(BTH_LE_GATT_CHARACTERISTIC));
if (NULL == pCharBuffer) {
printf("pCharBuffer out of memory\r\n");
}
else {
RtlZeroMemory(pCharBuffer,
charBufferSize * sizeof(BTH_LE_GATT_CHARACTERISTIC));
}
USHORT numChars;
hr = BluetoothGATTGetCharacteristics(
hLEDevice,
pServiceBuffer,
charBufferSize,
pCharBuffer,
&numChars,
BLUETOOTH_GATT_FLAG_NONE);
if (S_OK != hr) {
printf("BluetoothGATTGetCharacteristics - Actual Data %d", hr);
}
if (numChars != charBufferSize) {
printf("buffer size and buffer size actual size mismatch\r\n");
}
}
Getting error
Unhandled exception at 0x0F5CE138 (BluetoothApis.dll) in ConsoleApplication.exe: 0xC0000005: Access violation reading location 0xFFFFFFF7
Can anyone suggest what could be the cause?
I tried with a C# desktop application but no luck there also getting the FileNotFound error at the line "await GattDeviceService.FromIdAsync(device.Id)
"
The question is old, but there still no answer. This is due to GetBLEHandle
function that returned NULL. AGuid
is a GUID of BLE device (in Microsoft samples it's HRM - heart rate monitor), you have no device with this GUID connected. So NULL
from GetBLEHandle
is DEVICE_NOT_FOUND
. And if you'll call BluetoothGATTGetServices
with NULL
deviceHandle you'll receive such exception.
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