以下是国内一个开发商遇到的问题，欢迎大家参与。 调用DataPoin.SetValue()函数时，当AutoWrite的属性设置为TRUE时，产生Data Server出错，当AutoWrite的属性设置为FALSE时，没有错误产生，但调用Write方法写节点的网络变量没有任何反应。不知DataPoin.SetValue()函数时的调用是否有特殊要求。 BOOL CMyPropertyMonitoring::WriteNvVal(CString m_page, CString m_nvname, CString m_val, CString m_tag) { LcaMonitorSets m_tempMonitors; LcaMonitorSet m_tempMonitor; LcaNvMonitorPoints m_tempPoints; LcaNvMonitorPoint m_tempPoint; LcaDataPoint nvDataPoint; m_tempMonitors = MyGlobal.pVniAppDevice->GetMonitorSets(); try { m_tempMonitor = m_tempMonitors.GetItem(COleVariant(m_page)); } catch(COleDispatchException * pE) { GenericErrorHandler(this, pE ); return false; } try { m_tempPoints = m_tempMonitor.GetNvMonitorPoints(); } catch(COleDispatchException * pE) { GenericErrorHandler(this, pE ); return false; } try { m_tempPoint = m_tempPoints.GetItem(COleVariant(m_nvname)); } catch( COleDispatchException * pE ) { // If it breaks, then error out. GenericErrorHandler( this, pE ); return false; } nvDataPoint = m_tempPoint.GetDataPoint(); try { switch(m_tag.GetAt(0)) { case F: nvDataPoint.SetValue(atof(m_val));//**例如m_val = 3.14159,运行程序后将产生Data Server #370号错误 break; case I: nvDataPoint.SetFormattedValue (COleVariant (m_val)); break; case S: nvDataPoint.SetFormattedValue (COleVariant (m_val)); break; default: break; } } catch (COleDispatchException * pE) { GenericErrorHandler (this, pE); return false; } if (!(nvDataPoint.GetAutoWrite())) nvDataPoint.Write(); return TRUE; }