UfxDeviceIoControl 函数 (ufxclient.h)

将非内部 IOCTL 从用户模式传递到 UFX。

语法

BOOLEAN UfxDeviceIoControl(
  [in] UFXDEVICE  UfxDevice,
  [in] WDFREQUEST Request,
  [in] size_t     OutputBufferLength,
  [in] size_t     InputBufferLength,
  [in] ULONG      IoControlCode
);

参数

[in] UfxDevice

驱动程序通过调用 UfxDeviceCreate 创建的 UFX 设备对象的句柄。

[in] Request

框架请求对象的句柄。

[in] OutputBufferLength

如果输出缓冲区可用，则请求的输出缓冲区的长度（以字节为单位）。

[in] InputBufferLength

如果输入缓冲区可用，则请求的输入缓冲区的长度（以字节为单位）。

[in] IoControlCode

与请求关联的驱动程序定义或系统定义的 IOCTL。

返回值

一个布尔值，指示调用是否成功。

注解

客户端驱动程序调用 UfxDeviceIoControl ，以将其在其 EvtIoDeviceControl 回调函数中收到的非内部 IOCTL 转发到 UFX。 以下示例介绍如何执行以下操作：

VOID
DefaultQueue_EvtIoDeviceControl(
    _In_ WDFQUEUE Queue,
    _In_ WDFREQUEST Request,
    _In_ size_t OutputBufferLength,
    _In_ size_t InputBufferLength,
    _In_ ULONG IoControlCode
    )
/*++

Routine Description:

    EvtIoDeviceControl handler for the default Queue

Arguments:

    Queue -  Handle to the framework queue object that is associated with the
             I/O request.

    Request - Handle to a framework request object.

    OutputBufferLength - Size of the output buffer in bytes

    InputBufferLength - Size of the input buffer in bytes

    IoControlCode - I/O control code.

--*/
{
    WDFDEVICE WdfDevice;
    PCONTROLLER_CONTEXT ControllerContext;
    BOOLEAN HandledbyUfx;

    TraceEntry();

    TraceVerbose("Queue 0x%p, Request 0x%p, OutputBufferLength %d, "
                  "InputBufferLength %d, IoControlCode %d",
                  Queue, Request, (int) OutputBufferLength, 
                  (int) InputBufferLength, IoControlCode);
    
    WdfDevice = WdfIoQueueGetDevice(Queue);
    ControllerContext = DeviceGetControllerContext(WdfDevice);

    HandledbyUfx = UfxDeviceIoControl(
                        ControllerContext->UfxDevice,
                        Request,
                        OutputBufferLength,
                        InputBufferLength,
                        IoControlCode);

    if (!HandledbyUfx) {
        TraceError("Received an unsupported IOCTL");
        WdfRequestComplete(Request, STATUS_INVALID_DEVICE_REQUEST);
    }

    TraceExit();
}

要求

要求	值
最低受支持的客户端	Windows 10
目标平台	Windows
标头	ufxclient.h
Library	ufxstub.lib
IRQL	DISPATCH_LEVEL