如何预处理缓冲区并通过

Question

如何将请求发送到堆栈中的下一个驱动程序以进一步完成？

在我的过滤器驱动程序中，我使用回调 EvtDeviceIoWrite 为 EventWrite 注册了一个队列，如下所示：

VOID
EvtDeviceIoWrite(
    IN WDFQUEUE  Queue,
    IN WDFREQUEST  Request,
    IN size_t Length
)
{
    WDFMEMORY memory;
    NTSTATUS status;
    PUCHAR characters;
    UCHAR currentChar;
    UNREFERENCED_PARAMETER(Queue);

    status = WdfRequestRetrieveInputMemory(Request, &memory);
    if (!NT_SUCCESS(status)) {
        KdPrint(("RetreiveInputMemo:  failed 0x%x\n", status));
        return;
    }
    characters = (PUCHAR)WdfMemoryGetBuffer(memory, NULL);
    while (Length != 0) {
        Length--;
        currentChar = *(characters++);
        // Here I would like to edit the buffer
        // copy it to output buffer WdfMemoryCopyFromBuffer
    }
  **// what should be here for send** 
}

我只是想做类似 this 的事情，但为了请求。

抱歉，我是内核开发的新手，如果有人能指出我实现这一目标的正确方法，那就太好了。如有任何建议，我们将不胜感激。

Answer 1

在Windows-driver-samples exist huge count of examples how do Forwarding I/O Requests. take for example first simply code like in filter.c - here this done by FilterForwardRequest or FilterForwardRequestWithCompletionRoutine中-所以通常称为

WdfRequestSend(Request, WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)),WDF_NO_SEND_OPTIONS);

如何预处理缓冲区并通过

How to preprocess buffer and pass through

windows

kernel

driver

filter

wdf