函数指针做参数问题
本帖最后由 youhao1999 于 2012-12-24 10:32:15 编辑
类中声明：
void RegisterEveryNSamplesEvent(void);
int32 CVICALLBACK EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
类中实现：
#include "NIDAQmx.h"
void CDAQClass::RegisterEveryNSamplesEvent(void)
{
if((error = DAQmxRegisterEveryNSamplesEvent(taskHandle,DAQmx_Val_Acquired_Into_Buffer,1000,0,EveryNCallback,NULL))<0)
{
...
}
}
int32 CVICALLBACK CDAQClass::EveryNCallback(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData)
{
...
}
//编译出错：
//error C3867: “CDAQClass::EveryNCallback”: 函数调用缺少参数列表；请使//用“&CDAQClass::EveryNCallback”创建指向成员的指针
另在NIDAQmx.h中：
int32 __CFUNC DAQmxRegisterEveryNSamplesEvent(TaskHandle task, int32 everyNsamplesEventType, uInt32 nSamples, uInt32 options,DAQmxEveryNSamplesEventCallbackPtr callbackFunction, void *callbackData);
typedef int32 (CVICALLBACK *DAQmxEveryNSamplesEventCallbackPtr)(TaskHandle taskHandle, int32 everyNsamplesEventType, uInt32 nSamples, void *callbackData);
