c# - BluetoothGATTGetCharacteristics 在 BluetoothApis.dll 中抛出访问冲突读取位置 0xFFFFFFF7

Question

我正在尝试编写一个 Win32 控制台应用程序，它将连接 iPhone 蓝牙以获得某些 BLE 服务。如果我在这里犯了任何错误，请纠正我-

获取访问冲突错误 -

hr = BluetoothGATTGetCharacteristics(
    hLEDevice,
    pServiceBuffer,
    0,
    NULL,
    &charBufferSize,
    BLUETOOTH_GATT_FLAG_NONE);

原因是，我无法通过此设备类 ID 的 SetupDiEnumDeviceInterfaces 循环。

更多细节的主要功能-

#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");
    }
}

获取错误

Unhandled exception at 0x0F5CE138 (BluetoothApis.dll) in ConsoleApplication.exe: 0xC0000005: Access violation reading location 0xFFFFFFF7

任何人都可以提出可能是什么原因吗？

我尝试使用 C# 桌面应用程序，但运气不好，在“await GattDeviceService.FromIdAsync(device.Id)”行也出现 FileNotFound 错误

Answer 1

这个问题很老了，但是还是没有答案。这是由于 GetBLEHandle 函数返回 NULL。 AGuid 是 BLE 设备的 GUID(在 Microsoft 示例中它是 HRM - 心率监测器)，您没有连接此 GUID 的设备。因此 GetBLEHandle 的 NULL 是 DEVICE_NOT_FOUND。如果您使用 NULL deviceHandle 调用 BluetoothGATTGetServices，您将收到此类异常。