C ++ MSVC DLL编译错误缺少类型说明符和重新定义

Question

我正在使用Microsoft Visual Studio社区2015 Update 3并且我正在编译一个dll。我想调用函数InitPreySplitPipe我已经尝试用:: pr :: InitPreySplitPipe调用它，我将interprocess.cpp代码复制到game_local.cpp和interprocess.hpp代码到game_local.h并从那里调用但是没有工作任

如果有人感兴趣，我已经设置了GitHub repository所有代码。

感谢阅读并抱歉我的英语不好：/

编译器输出：

Error C4430 missing type specifier - int assumed. Note: C++ does not support default-int
Error C2371 'pr::InitPreySplitPipe': redefinition; different basic types
Error C2556 'int InitPreySplitPipe(void)': overloaded function differs only by return type from 'void pr::InitPreySplitPipe(void)'

interprocess.hpp

namespace pr
{
(...)
void InitPreySplitPipe();
(...)
}

interprocess.cpp

#include "interprocess.hpp"

namespace pr
{
(...)
    void InitPreySplitPipe()
    {
        pipe_preysplit = CreateNamedPipe("\\\\.\\pipe\\" PREYSPLIT_PIPE_NAME,PIPE_ACCESS_OUTBOUND | FILE_FLAG_OVERLAPPED, PIPE_TYPE_MESSAGE | PIPE_REJECT_REMOTE_CLIENTS, 1, 256 * 1000, 0, 0, NULL);
        if (pipe_preysplit == INVALID_HANDLE_VALUE)
        {
            return;
        }

        std::memset(&overlapped, 0, sizeof(overlapped));
        overlapped.hEvent = CreateEvent(NULL, TRUE, TRUE, NULL);
        if (overlapped.hEvent == NULL)
        {
            pipe_preysplit = INVALID_HANDLE_VALUE;
        }
    }
(...)
}

//应该调用函数

game_local.cpp

(...)
#include "../PreyRun/interprocess.hpp"
pr::InitPreySplitPipe();
(...)

Answer 1

在game_local.cpp中：

// PreyRun BEGIN
#include "../PreyRun/interprocess.hpp"
pr::InitPreySplitPipe();
// PreyRun END

您没有从任何内容调用该函数，因此编译器认为它是一个新的函数声明。因此，假定类型int，其中重载函数int pr:InitPreySplitPipe()与您的void pr::InitPreySplitPipe()冲突。这解释了所有3条错误消息。