vc中的程序：
float CCJDlg::ReadAI(long m_Devhwnd,USHORT Channel)
{
//读给定端口的模拟量，显示电压
float fVoltage=0;
ptAIVoltageInExp.DasChan = Channel;
ptAIVoltageInExp.DasGain = 0; //电压输出范围0-5v 0
ptAIVoltageInExp.ExpChan = 0;
ptAIVoltageInExp.voltage = (FLOAT far *)&fVoltage;


if ((ErrCde = DRV_AIVoltageInExp(m_Devhwnd,
(LPT_AIVoltageInExp)&ptAIVoltageInExp)) != 0)
{
DRV_GetErrorMessage(ErrCde,(LPSTR)szErrMsg);
MessageBox((LPCSTR)szErrMsg,"Driver Message",MB_OK);
DRV_DeviceClose((LONG far *)&DriverHandle);
return 0;
}
return fVoltage;
}