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Windows Phone 8.1 驱动开发——注册表read/write

2024-11-08 09:37:02   203人阅读

在做Windows Phone驱动开发时，时常需要和注册表打交道，因此，作为手机驱动开发人员，有必要了解一下注册表相关的知识。本人目前对注册表也不怎么了解，也只是大概的知道在Windows Phone下，驱动的inf文件并不像桌面Windows那样提供驱动自动安装程序，在Windows Phone下，inf文件最终会被解析成注册表信息并添加到注册表中。我们驱动往往将一些硬件参数保存在注册表中，因此在软件编程时，自然就会涉及到注册表的读写更新操作。


本人目前在做触摸屏驱动时，就涉及到了注册表的读写操作。为了方便以后查阅，这里贴出注册表的更新UpdateRegistry()和读取ReadRegistry()函数代码。


更新注册表：

NTSTATUS
    __drv_requiresIRQL(PASSIVE_LEVEL)
    UpdateRegistry(
    __in WDFDEVICE         FxDevice,
    __in  PUNICODE_STRING SubkeyName,
    __in  PUNICODE_STRING ValueName,
    __inout PUNICODE_STRING Value
    )

{
    NTSTATUS status;
    NTSTATUS RegFlushStatus;
    WDFKEY Key = NULL;
    WDFKEY Subkey = NULL;
    HANDLE KeyHandle;

    PAGED_CODE();

    //
    // Find FileName from registry key
    //
    status = WdfDeviceOpenRegistryKey(FxDevice,
                                      PLUGPLAY_REGKEY_DEVICE,
                                      STANDARD_RIGHTS_ALL,
                                      WDF_NO_OBJECT_ATTRIBUTES,
                                      &Key);
    if (!NT_SUCCESS(status))
        goto exit;

    status = WdfRegistryOpenKey(Key, SubkeyName, KEY_READ, WDF_NO_OBJECT_ATTRIBUTES, &Subkey);
    if (!NT_SUCCESS(status))
        goto exit;

    status = WdfRegistryAssignUnicodeString(Subkey, ValueName, Value);
    if (!NT_SUCCESS(status))
        goto exit;

    //flush the key for immediate effect
    KeyHandle = WdfRegistryWdmGetHandle(Subkey);
    if( NULL != KeyHandle)
    {
        RegFlushStatus = ZwFlushKey(KeyHandle);
    }

exit:
    if (Subkey != NULL)
        WdfRegistryClose(Subkey);

    if (Key != NULL)
        WdfRegistryClose(Key);

    return status;
}


读取注册表：

NTSTATUS
    __drv_requiresIRQL(PASSIVE_LEVEL)
    ReadRegistry(
    __in WDFDEVICE FxDevice,
    __in  PUNICODE_STRING SubkeyName,
    __in  PUNICODE_STRING ValueName,
    __inout PUNICODE_STRING Value
    )
{

    NTSTATUS Status;
    WDFKEY Key = NULL;
    WDFKEY Subkey = NULL;
    PAGED_CODE();

    //
    // Find FileName from registry key
    //
    Status = WdfDeviceOpenRegistryKey(FxDevice, 
                                      PLUGPLAY_REGKEY_DEVICE, 
                                      KEY_READ, 
                                      WDF_NO_OBJECT_ATTRIBUTES,
                                      &Key);
    if (!NT_SUCCESS(Status))
        goto exit;

    Status = WdfRegistryOpenKey(Key, SubkeyName, KEY_READ, WDF_NO_OBJECT_ATTRIBUTES, &Subkey);
    if (!NT_SUCCESS(Status))
        goto exit;

    //
    // Get String
    //
    Status = WdfRegistryQueryUnicodeString(Subkey, ValueName, NULL, Value);
    if (!NT_SUCCESS(Status))
        goto exit;

exit:
    if (Subkey != NULL)
        WdfRegistryClose(Subkey);

    if (Key != NULL)
        WdfRegistryClose(Key);

    return Status;
}



函数使用案例

inf文件：

;
; TouchDetectionDriver.inf
;

...

[TouchDetectionDriver_Device.NT.HW]
AddReg = FilterInst.NT.HW.AddReg

[FilterInst.NT.HW.AddReg]
HKR,%QtTouchRegPath%,"TouchControllerID",0x00000002,"FF"
HKR,%QtTouchRegPath%,"ForceControllerProbe",0x00000002,"1"

...

[Strings]
QtTouchRegPath = "Configuration File"
...
该inf文件最终会被解析成注册表信息，并在添加到系统注册表中。可以看到，在子键Configuration File目录下，存在两个entry，它们分别为TouchControllerID和ForceControllerProbe，键值分别为"FF"和"1"。


驱动文件：

NTSTATUS RegistryTest(WDFDEVICE FxDevice)
{
    NTSTATUS status = STATUS_SUCCESS;

    UNICODE_STRING strControllerID;
    ULONG TouchControllerID = 0;
    WCHAR szIDBuffer[3] = {0};

    UNICODE_STRING strForceProbe;
    ULONG ForceControllerProbe = 0;
    WCHAR szProbeBuffer[3] = {0};

    DECLARE_CONST_UNICODE_STRING(SubkeyName, L"Configuration File");
    DECLARE_CONST_UNICODE_STRING(KeyTouchControllerID, L"TouchControllerID");
    DECLARE_CONST_UNICODE_STRING(KeyForceControllerProbeID, L"ForceControllerProbe");

    //Read TouchControllerID
    RtlInitEmptyUnicodeString(&strControllerID, szIDBuffer, sizeof(szIDBuffer));
    ReadRegistry(FxDevice,(PUNICODE_STRING)&SubkeyName,(PUNICODE_STRING)&KeyTouchControllerID,&strControllerID);
    RtlUnicodeStringToInteger(&strControllerID, 10, (PULONG)&TouchControllerID);
    TDDLog("TDD:ControllerIDFromRegistry:ControllerID Registry Value is %d\n", TouchControllerID);

    //Read ForceControllerProbe
    RtlInitEmptyUnicodeString(&strForceProbe, szProbeBuffer, sizeof(szProbeBuffer));
    ReadRegistry(FxDevice,(PUNICODE_STRING)&SubkeyName,(PUNICODE_STRING)&KeyForceControllerProbeID, &strForceProbe);
    RtlUnicodeStringToInteger(&strForceProbe, 10, (PULONG)&ForceControllerProbe);
    TDDLog("TDD:ControllerIDFromRegistry:Force controller probe Register Value is %d\n", ForceControllerProbe);

    //Update TouchControllerID
    RtlIntegerToUnicodeString(1, 10, &strControllerID);
    UpdateRegistry(FxDevice, (PUNICODE_STRING)&SubkeyName, (PUNICODE_STRING)&KeyTouchControllerID, &strControllerID);

    //Update ForceControllerProbe
    RtlIntegerToUnicodeString(0, 10, &strForceProbe);
    UpdateRegistry(FxDevice, (PUNICODE_STRING)&SubkeyName, (PUNICODE_STRING)&KeyForceControllerProbeID, &strForceProbe);

    return status;
}




Windows Phone 8.1 驱动开发——注册表read/write


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