windows 为管道客户端创建文件失败，错误为231 ERROR_PIPE_忙碌

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我正在尝试让两个DLL互相通信。一个用作管道服务器，只要程序运行就保持活动状态，另一个用作管道客户端，在管道服务器处于活动状态时，可以在给定的情况下连接和断开连接。请考虑以下函数：

DLL1（管道服务器）

void DLL1_Begin() // This gets called only once, when the program starts
{
    g_hPipeServer = CreateNamedPipe(TEXT("\\\\.\\pipe\\MyPipe123"),
            PIPE_ACCESS_DUPLEX,
            PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_NOWAIT,
            1,
            4,
            4,
            NMPWAIT_USE_DEFAULT_WAIT,
            NULL);

    if (g_hPipeServer == INVALID_HANDLE_VALUE)
    {
        char error[256];
        sprintf_s(error, "Server pipe error %lu", GetLastError());
        MessageBox(NULL, error, "Fatal error", MB_OK | MB_ICONERROR);
        exit(1);
    }

    ConnectNamedPipe(g_hPipeServer, NULL);
}

void DLL1_End() // This gets called only once, when the program closes
{
    DisconnectNamedPipe(g_hPipeServer);
    CloseHandle(g_hPipeServer);
}

DLL2（管道客户端）

// Like DLL1, DLL2 gets initialized once and is always attached to the program.
// These functions are called occasionally and are meant solely for the Pipe.

void DLL2_InitPipeClient()
{
    g_hClientPipe = CreateFile(TEXT("\\\\.\\pipe\\MyPipe123"),
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_EXISTING,
        0,
        NULL);

    if (g_hClientPipe == INVALID_HANDLE_VALUE) // This scope is of interest
    {
        char error[256];
        sprintf_s(error, "Client pipe error %lu", GetLastError());
        MessageBox(NULL, error, "Fatal error", MB_OK | MB_ICONERROR);
        exit(1);
    }
}

void DLL2_EndPipeClient()
{
    CloseHandle(g_hClientPipe);
    g_hClientPipe = NULL;
}

具体步骤如下：
1.程序启动，连接DLL1并调用DLL1_Begin
1.在任何时候，用户与按钮交互，DLL2被连接，DLL2_InitPipeClient被调用。只要程序在运行，DLL2就保持连接到程序
1.在任何时候，用户与另一个按钮交互，调用DLL2_EndPipeClient，然后立即调用DLL2_InitPipeClient。
1.客户端管道第二次无法使用CreateFile初始化，给出error 231
用户需要能够随时“重新启动”客户端管道。为什么服务器管道会忙碌呢？CloseHandle总是返回true，但在此之后，调用CreateFile将返回INVALID_HANDLE_VALUE和error 231。
请注意，我一次只能有一个管道客户端。我尝试将CreateNamedPipe的maxinstances参数设置为一个更高的值以防万一，但错误没有消失，我无法初始化客户端管道...我该如何解决这个问题？
顺便说一下，通信是来回的，我只是不能让Client管道关闭并重新启动，而且我不能让它一直处于活动状态，这超出了我的能力范围。

根据[MS.文件]：ConnectNamedPipe函数（namedpipeapi. h）-备注（强调的是我的）：
命名管道服务器进程可以将ConnectNamedPipe与新创建的管道示例一起使用。***它还可以与以前连接到另一个客户端进程的示例一起使用;在这种情况下，服务器进程必须首先调用DisconnectNamedPipe函数，以便在句柄可以重新连接到新客户端之前断开句柄与先前客户端的连接。否则，ConnectNamedPipe返回零，并且如果先前客户端已经关闭其句柄，则GetLastError返回ERROR_NO_DATA，或者如果先前客户端尚未关闭其句柄，则GetLastError返回ERROR_PIPE_CONNECTED。
我修改了你的消息来源，让你有了一个可行的例子。

包括h*：

#pragma once

// Dumped everything here for convenience.
// In real world, each .dll would have its own header file(s).

#include <stdio.h>
#include <Windows.h>

#define PIPE_NAME "\\\\.\\pipe\\DemoPipe1234"

#if defined(_BUILD_NO_DLLS)
#  define DLL_EXPORT_API
#else
#  if defined(DLL_EXPORTS)
#    define DLL_EXPORT_API __declspec(dllexport)
#  else
#    define DLL_EXPORT_API __declspec(dllimport)
#  endif
#endif

#if defined(__cpluscplus)
extern "C" {
#endif

DLL_EXPORT_API void DLL1_Begin();
DLL_EXPORT_API void ReconnectServerEndpoint();
DLL_EXPORT_API void DLL1_End();

DLL_EXPORT_API void DLL2_InitPipeClient();
DLL_EXPORT_API void DLL2_EndPipeClient();

#if defined(__cpluscplus)
}
#endif

服务器c*：

#define DLL_EXPORTS
#include "inc.h"

HANDLE g_hPipeServer = INVALID_HANDLE_VALUE;

void DLL1_Begin()
{
    //printf("%s - 0x%016llX\n", __FUNCTION__, g_hPipeServer);
    g_hPipeServer = CreateNamedPipe(PIPE_NAME,
            PIPE_ACCESS_DUPLEX,
            PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_NOWAIT,
            1,
            4,
            4,
            NMPWAIT_USE_DEFAULT_WAIT,
            NULL);

    if (g_hPipeServer == INVALID_HANDLE_VALUE) {
        printf("Server pipe creation error %lu", GetLastError());
    }
}

void ReconnectServerEndpoint()
{
    if (g_hPipeServer == INVALID_HANDLE_VALUE) {
        printf("Can't reconnect invalid pipe\n");
        return;
    }
    if (!DisconnectNamedPipe(g_hPipeServer)) {
        printf("Server pipe disconnect error %lu\n", GetLastError());
    }
    if (!ConnectNamedPipe(g_hPipeServer, NULL)) {
        DWORD gle = GetLastError();
        if (gle != ERROR_PIPE_LISTENING) {
            printf("Server pipe connect error %lu\n", gle);
        }
    }
}

void DLL1_End()
{
    //printf("%s - 0x%016llX\n", __FUNCTION__, g_hPipeServer);
    if (g_hPipeServer != INVALID_HANDLE_VALUE) {
        if (!DisconnectNamedPipe(g_hPipeServer)) {
            printf("Server pipe disconnect error %lu\n", GetLastError());
        }
        CloseHandle(g_hPipeServer);
        g_hPipeServer = INVALID_HANDLE_VALUE;
    }
}

附件c*：

// Like DLL1, DLL2 gets initialized once and is always attached to the program.
// These functions are called occasionally and are meant solely for the Pipe.

#define DLL_EXPORTS
#include "inc.h"

HANDLE g_hClientPipe = INVALID_HANDLE_VALUE;

void DLL2_InitPipeClient()
{
    //printf("%s - 0x%016llX\n", __FUNCTION__, g_hClientPipe);
    g_hClientPipe = CreateFile(PIPE_NAME,
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_EXISTING,
        0,
        NULL);

    if (g_hClientPipe == INVALID_HANDLE_VALUE) {
        printf("Client pipe creation error %lu\n", GetLastError());
    }
}

void DLL2_EndPipeClient()
{
    //printf("%s - 0x%016llX\n", __FUNCTION__, g_hClientPipe);
    if (g_hClientPipe != INVALID_HANDLE_VALUE) {
        CloseHandle(g_hClientPipe);
        g_hClientPipe = INVALID_HANDLE_VALUE;
    }
}

主00.c *：

#include "inc.h"
#include <conio.h>

#if defined(_BUILD_NO_DLLS)
#  include "cli.c"
#  include "srv.c"
#endif

void loop()
{
    char c = 0;
    while (c != 0x1B) {
        //printf("\n************ MENU ************\nPress:\n- c to connect client\n- d to disconnect client\n- ESC to quit\n- Anything else to do nothing\n******************************\n");
        printf("\nPress: c to connect client, d to disconnect client, ESC to exit:\n");
        c = getch();
        switch (c) {
            case 0x1B: {
                printf("Exit\n");
                break;
            }
            case 0x43:
            case 0x63: {
                printf("Connect client\n");
                DLL2_InitPipeClient();
                break;
            }
            case 0x44:
            case 0x64: {
                printf("Disonnect client\n");
                DLL2_EndPipeClient();
                ReconnectServerEndpoint();
                break;
            }
            default: printf("Do nothing\n");
        }
    Sleep(500);
    }
}

int main()
{
    DLL1_Begin();

    loop();

    DLL1_End();
    printf("\nDone.\n\n");
    return 0;
}

备注：

我添加了客户端断开连接时应调用的 ReconnectServerEndpoint
我将可执行文件链接到2 .dlls。我不知道您应该如何执行操作，也许可以动态加载 .dlls，但这不会产生任何影响
输出：

[cfati@CFATI-5510-0:e:\Work\Dev\StackOverflow\q074753431]> sopr.bat
### Set shorter prompt to better fit when pasted in StackOverflow (or other) pages ###

[prompt]> "c:\Install\pc032\Microsoft\VisualStudioCommunity\2019\VC\Auxiliary\Build\vcvarsall.bat" x64 > nul

[prompt]> dir /b
cli.c
inc.h
main00.c
srv.c

[prompt]> cl /nologo /MD /DDLL srv.c  /link /NOLOGO /DLL /OUT:dll1.dll
srv.c
   Creating library dll1.lib and object dll1.exp

[prompt]> cl /nologo /MD /DDLL cli.c  /link /NOLOGO /DLL /OUT:dll2.dll
cli.c
   Creating library dll2.lib and object dll2.exp

[prompt]> cl /nologo /MD /W0 main00.c  /link /NOLOGO /OUT:main_dll.exe dll1.lib dll2.lib
main00.c

[prompt]> dir /b
cli.c
cli.obj
dll1.dll
dll1.exp
dll1.lib
dll2.dll
dll2.exp
dll2.lib
inc.h
main00.c
main00.obj
main_dll.exe
srv.c
srv.obj

[prompt]>
[prompt]> main_dll.exe

Press: c to connect client, d to disconnect client, ESC to exit:
Connect client

Press: c to connect client, d to disconnect client, ESC to exit:
Disonnect client

Press: c to connect client, d to disconnect client, ESC to exit:
Connect client

Press: c to connect client, d to disconnect client, ESC to exit:
Disonnect client

Press: c to connect client, d to disconnect client, ESC to exit:
Connect client

Press: c to connect client, d to disconnect client, ESC to exit:
Disonnect client

Press: c to connect client, d to disconnect client, ESC to exit:
Connect client

Press: c to connect client, d to disconnect client, ESC to exit:
Connect client
Client pipe creation error 231

Press: c to connect client, d to disconnect client, ESC to exit:
Disonnect client

Press: c to connect client, d to disconnect client, ESC to exit:
Disonnect client

Press: c to connect client, d to disconnect client, ESC to exit:
Exit

Done.

在上面的输出中，可以看到 *ERROR_PIPE_忙碌 * 仅在客户端尝试连接两次（已经有一个连接的客户端）时发生。
有关更多详细信息，您可以查看：

windows 为管道客户端创建文件失败，错误为231 ERROR_PIPE_忙碌

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