Question

正如标题所示，我在使用以下代码时遇到了麻烦：

EvtDeviceIoWrite(
   IN WDFQUEUE  Queue,
   IN WDFREQUEST  Request,
   IN size_t Length
) {
WDF_OBJECT_ATTRIBUTES_INIT(&attributes);
attributes.ParentObject = WdfIoQueueGetDevice(Queue);
status = WdfRequestCreate(&attributes, WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)), &newRequest);  
if (!NT_SUCCESS(status)) {
    KdPrint(("Serial:  failed 0x%x\n", status));
    WdfRequestComplete(Request, status);
    return;
}
WDF_OBJECT_ATTRIBUTES_INIT(&attributes);
attributes.ParentObject = newRequest;
status = WdfMemoryCreate(&attributes, NonPagedPool, 'MyPl', 10, &newmem, &newbuf);
if (!NT_SUCCESS(status)) {
    KdPrint(("Serial:  failed 0x%x\n", status));
    WdfRequestComplete(Request, status);
    return;
}

WDF_REQUEST_SEND_OPTIONS_INIT(&options,
    WDF_REQUEST_SEND_OPTION_SEND_AND_FORGET);
ret = WdfRequestSend(newRequest, WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)), &options);
}
if (ret == FALSE) {
    status = WdfRequestGetStatus(newRequest);
    KdPrint(("WdfRequestSend failed: 0x%x\n", status));
    WdfRequestComplete(Request, status);
}

我无法将newRequest发送到堆栈中... ret值为“FALSE”且状态为STATUS_INVALID_DEVICE_STATE。如何使设备处于正常状态？

我按照link的建议做了一切。总结一下，我无法向本地IO堆栈发送请求，目标IO处于不正常状态，我不知道如何使其工作？

Answer 1

WDF_OBJECT_ATTRIBUTES_INIT(&attributes);
attributes.ParentObject = WdfIoQueueGetDevice(Queue);
status = WdfRequestCreate(&attributes, WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)), &newRequest);  
if (!NT_SUCCESS(status)) {
    KdPrint(("Serial:  failed 0x%x\n", status));
    WdfRequestComplete(Request, status);
    return;
}
WDF_OBJECT_ATTRIBUTES_INIT(&attributes);
attributes.ParentObject = newRequest;
status = WdfMemoryCreate(&attributes, NonPagedPool, 'MyPl', 10, &newMem, &newBuf);
if (!NT_SUCCESS(status)) {
    KdPrint(("Serial:  failed 0x%x\n", status));
    WdfRequestComplete(Request, status);
    return;
}
/*Proessing request */


/*End Processing request */
WdfRequestFormatRequestUsingCurrentType(newRequest);
WdfIoTargetFormatRequestForWrite(WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)), newRequest, newMem, NULL , NULL);
ret = WdfRequestSend(newRequest, WdfDeviceGetIoTarget(WdfIoQueueGetDevice(Queue)), NULL);

if (ret == FALSE) {
    status = WdfRequestGetStatus(newRequest);
    KdPrint(("WdfRequestSend failed: 0x%x\n", status));

}
WdfRequestComplete(Request, status);

这是如何实现它的。

如何将另一个请求传递到堆栈中？

1 个答案: