解释下面3句C++代码，在线等

[简单才是美]

HINSTANCE hDll;
hDll = LoadLibrary(_T("..\\AliveECGPlugin.dll"));
if( !hDll )
{
hDll = LoadLibrary(_T("AliveECGPlugin.dll"));
}

//DLL
typedef void (*fnBeatDetectorInit)(int nADCUnit, int nADCZero, int nSampleRate);//请解释一下
typedef int (*fnBeatDetectorProcessSample) (int nDatum, double *dHR, char *sAnnotation);
typedef void (*fnFilterInit) (int nSampleRate);
typedef int (*fnFilterProcessSample) (int nDatum);

fnBeatDetectorInit pfnBeatDetectorInit;//请解释一下
fnBeatDetectorProcessSample pfnBeatDetectorProcessSample;
fnFilterInit pfnFilterInit;
fnFilterProcessSample pfnFilterProcessSample;

pfnBeatDetectorInit = (fnBeatDetectorInit) GetProcAddress( hDll,"fnBeatDetectorInit" ); //请解释一下
pfnBeatDetectorProcessSample = (fnBeatDetectorProcessSample) GetProcAddress( hDll,"fnBeatDetectorProcessSample" );
pfnFilterInit = (fnFilterInit) GetProcAddress( hDll,"pfnFilterInit" );
pfnFilterProcessSample = (fnFilterProcessSample) GetProcAddress( hDll,"fnFilterProcessSample" );

[a746027209]

1. typedef void (*fnBeatDetectorInit)(int nADCUnit, int nADCZero, int nSampleRate);
这是定义函数指针类型...可以用它指向函数
2. fnBeatDetectorInit pfnBeatDetectorInit
声明了一个函数指针对象
3.pfnBeatDetectorInit = (fnBeatDetectorInit) GetProcAddress( hDll,"fnBeatDetectorInit" );
从动态链接库中获得函数的地址，把它赋给函数指针 “fnBeatDetectorInit"的对象"fnBeatDetectorInit",以此来引用函数...

[bobob]

typedef void (*fnBeatDetectorInit)(int nADCUnit, int nADCZero, int nSampleRate);
定义函数指针类型，指向的函数原型为：
void fnBeatDetectorInit(int nADCUnit, int nADCZero, int nSampleRate);

fnBeatDetectorInit pfnBeatDetectorInit;
定义函数指针

pfnBeatDetectorInit = (fnBeatDetectorInit) GetProcAddress( hDll,"fnBeatDetectorInit" );
获取dll里面函数地址（函数指针）

这三个其实是一个问题，楼主好好看看函数指针方面的知识

[DaiDaoDeRen]

1. typedef void (*fnBeatDetectorInit)(int nADCUnit, int nADCZero, int nSampleRate);
定义了一种类型：fnBeatDetectorInit，这种类型是函数指针，该指针指向一个这样的函数：参数是int nADCUnit, int nADCZero, int nSampleRate，返回类型为void
2. fnBeatDetectorInit pfnBeatDetectorInit
声明并定义了一个函数指针
3.pfnBeatDetectorInit = (fnBeatDetectorInit) GetProcAddress( hDll,"fnBeatDetectorInit" );
函数GetProcAddress()从动态链接库中得到一个函数，返回了函数指针，把该函数指针赋予pfnBeatDetectorInit。

建议LZ看看函数指针的相关内容

[简单才是美]

大家都对了，我只是不太确定，尤其是第一个，见过类似于typedef int INT,没见过那种把函数也搞进去，谢谢各位了