我的解决方案（Visual Studio）中有两个项目
我想分配函数

void _OnCycle()
{
    printf("Success\n");
}

指向PluginCallbacks结构的指针成员函数OnCycle。

extern "C" unsigned int PluginInit(PluginFuncs * pluginFuncs, PluginCallbacks * pluginCalls, PluginInfo * pluginInfo) {
    pluginCalls->OnCycle = _OnCycle;
    return 1;
}

但是程序崩溃了。下面是完整的代码。
一个二个一个一个
和第二项目

//Project: Dll1
//file: Dll1/Dll1/main.cpp
#include "plugin.h"
#include "main.h"
#include "stdio.h"

void _OnCycle() { 
    printf("Success\n");
}
extern "C" unsigned int PluginInit(PluginFuncs * pluginFuncs, PluginCallbacks * pluginCalls, PluginInfo * pluginInfo) {
    printf("PluginInit called\n");
    pluginCalls->OnCycle = _OnCycle;
    return 1;
}

//Project: Dll1
//file: Dll1/Dll1/main.h
#define EXPORT __declspec(dllexport)
#include "plugin.h"

#ifdef __cplusplus
extern "C" {
#endif
    EXPORT  unsigned int            PluginInit(PluginFuncs* pluginFuncs, PluginCallbacks* pluginCalls, PluginInfo* pluginInfo);
#ifdef __cplusplus
}
#endif

//Project: Dll1
//file: Dll1/Dll1/plugin.h
#pragma once
#include <stdint.h>

typedef struct _Settings {
    uint32_t structSize;
    uint32_t flags;
} Settings;

typedef struct _PluginInfo {
    uint32_t structSize;
    char name[32];
} PluginInfo;

typedef struct _PluginFuncs {
    uint32_t structSize;
    uint32_t(*GetVersion) (void);
}PluginFuncs;

typedef struct {
    uint32_t structSize;
    void (*OnCycle) ();
}PluginCallbacks;

它可以构建，但在执行时崩溃。

//Output
C:\Users\[hidden]\source\repos\Dll1\Release>ConsoleAPplication1
Loading first dll
PluginInit called
PluginInit(a,b,c) returned 1
Now going to call OnCycle

C:\Users\[hidden]\source\repos\Dll1\Release>

看，它崩溃了，因为"完成"消息没有打印。
这是如何正确地完成。