如何将IcmpSendEcho2与PIO_APC_ROUTINE一起使用? [英] How to use IcmpSendEcho2 with PIO_APC_ROUTINE?

问题描述

我是c ++新手，我正在尝试使用

I'm a c++ newbie and I'm trying to make a "ping tool" with IcmpSendEcho2 but I can't make it to work with APCs.

我遇到了此编译错误:

>error C2220: warning treated as error - no 'object' file generated
>warning C4191: 'type cast' : unsafe conversion from 'PIO_APC_ROUTINE (__cdecl *)(PVOID,PIO_STATUS_BLOCK,ULONG)' to 'PIO_APC_ROUTINE'
>          Calling this function through the result pointer may cause your program to fail

这是我的APC声明:

PIO_APC_ROUTINE GotIt(PVOID param, PIO_STATUS_BLOCK IoStatusBlock, ULONG Reserved);

这是我的APC定义:

PIO_APC_ROUTINE GotIt(PVOID param, PIO_STATUS_BLOCK IoStatusBlock, ULONG Reserved)
{
    printf("GOT IT!\n");
    return NULL;
}

这就是我制作IcmpSendEcho2的方法:

And this is how I make the IcmpSendEcho2:

DWORD dwRetVal = IcmpSendEcho2(hIcmpFile, NULL, (PIO_APC_ROUTINE) GotIt, NULL,
                     ipaddr, SendData, sizeof (SendData), NULL,
                     ReplyBuffer, ReplySize, 1000);

我以为'(PIO_APC_Rountine)GotIt'会做到的，因为我发现

I thought '(PIO_APC_Rountine) GotIt' would do it, because I found this, but apparently I'm missing something.

如果您需要任何其他信息，请告诉我.

If you need any additional information, let me know.

非常感谢.

推荐答案

首先，不要转换回调函数. 所有.

第二，PIO_APC_ROUTINE声明为:

typedef
VOID
(NTAPI *PIO_APC_ROUTINE) (
    IN PVOID ApcContext,
    IN PIO_STATUS_BLOCK IoStatusBlock,
    IN ULONG Reserved
    );

因此您的GotIt函数应为:

VOID NTAPI GotIt(
    IN PVOID ApcContext,
    IN PIO_STATUS_BLOCK IoStatusBlock,
    IN ULONG Reserved
);

NTAPI是__stdcall，而不是默认的__cdecl，这是错误消息告诉您的内容.

NTAPI is __stdcall, not the default __cdecl, which is what the error message is telling you.

您对此做了什么:

PIO_APC_ROUTINE GotIt(PVOID param, PIO_STATUS_BLOCK IoStatusBlock, ULONG Reserved);

...声明了一个返回函数指针的函数.这不是你想要的.

...is declare a function that returns a function pointer. This is not what you wanted.

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