Question

我编写了一个简单的键盘过滤器驱动程序（MyKbdFilter），在注册表中注册并添加到HLM \ SYSTEM \ CurrentControlSet \ Control \ Class {4D36E96B-E325-11CE-BFC1-08002BE10318} \ UpperFilters MyKbdFilter。现在我有：＆＃34; kbdclass MyKbdFilter＆＃34;。因此，当为键盘构建新的设备堆栈时，我得到MyKbdFilter-＆gt; kdbclass-＆gt; kbHid-＆gt; HidUsb。当我插入键盘时，我看到调用了DriverEntry，AddDevice，DispatchThru和DispatchPNP。但键盘没有响应。在键击时，既不调用DispatchRead也不调用其他函数。这是我的代码：

NTSTATUS DriverEntry(IN DRIVER_OBJECT* pDriverObject, IN UNICODE_STRING* pRegPath) {    
    int i;
    NTSTATUS status;


    for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; i++) {
        pDriverObject->MajorFunction[i] = DispatchThru;
    }

    pDriverObject->MajorFunction[IRP_MJ_READ] = DispatchRead;

    pDriverObject->MajorFunction[IRP_MJ_POWER] = DispatchPower;
    pDriverObject->MajorFunction[IRP_MJ_PNP] = DispatchPNP;

    pDriverObject->DriverUnload = UnloadDriver;

    pDriverObject->DriverExtension->AddDevice = AddDevice;

    return STATUS_SUCCESS;
}

NTSTATUS AddDevice(IN PDRIVER_OBJECT pDriverObject, IN PDEVICE_OBJECT pTargetDeviceObject){
    PDEVICE_OBJECT pSourceDeviceObject, pDeviceObject;
    PDEVICE_EXTENSION pDeviceExtension;
    NTSTATUS status;

    status = IoCreateDevice(pDriverObject, sizeof(DEVICE_EXTENSION), NULL, FILE_DEVICE_KEYBOARD, 0, FALSE, &pSourceDeviceObject);

    pDeviceExtension = (PDEVICE_EXTENSION) pSourceDeviceObject->DeviceExtension;

    pDeviceObject = IoAttachDeviceToDeviceStack(pSourceDeviceObject, pTargetDeviceObject);

    pDeviceExtension->pLowerDeviceObject = pTargetDeviceObject;

    pSourceDeviceObject->Flags = pDeviceObject->Flags & (DO_BUFFERED_IO | DO_POWER_PAGABLE | DO_DIRECT_IO);
    pSourceDeviceObject->Flags = pDeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;

    return status;
}

NTSTATUS DispatchThru(IN PDEVICE_OBJECT pDeviceObject, IN PIRP pIrp) {
    IoSkipCurrentIrpStackLocation(pIrp);

    return IoCallDriver(((PDEVICE_EXTENSION) pDeviceObject->DeviceExtension)->pLowerDeviceObject ,pIrp);    
}

NTSTATUS DispatchRead(IN PDEVICE_OBJECT pDeviceObject, IN PIRP pIrp) {
    IoSkipCurrentIrpStackLocation(pIrp);

    return IoCallDriver(((PDEVICE_EXTENSION) pDeviceObject->DeviceExtension)->pLowerDeviceObject ,pIrp);    
}

编辑：我使用的是Windows 7。

Answer 1

pDeviceObject = IoAttachDeviceToDeviceStack(pSourceDeviceObject, pTargetDeviceObject);
pDeviceExtension->pLowerDeviceObject = pTargetDeviceObject;

这是错误：需要感觉pDeviceExtension->pLowerDeviceObject = pDeviceObject;

但真正正确的代码

IoAttachDeviceToDeviceStackSafe(pSourceDeviceObject, pTargetDeviceObject, &pDeviceExtension->pLowerDeviceObject);

这是主要观点，只是可见。

pSourceDeviceObject->Flags = pDeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;

其他一个错误 - 需要：

pSourceDeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;

键盘过滤器驱动程序没有响应

1 个答案: