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driver.h error C3389: __declspec(dllexport) cannot be used with /clr:pure or /clr:safe

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#include  <windows.h>

#include <windef.h> 

#include <stdio.h> 

#include <conio.h>

#define WIN_CONSOLE 

#include "...\...\...\include\driver.h" 

/****************************** 

* Local function declaration * 

******************************/ 

void ErrorHandler( DWORD dwErrCde ); 

void ErrorStop( long*, DWORD ); 

void main() 

{ 
   DWORD dwErrCde; 

   ULONG lDevNum; 

   long lDriverHandle; 

   USHORT usChan; 

   float fVoltage; 

   PT_AIVoltageIn ptAIVoltageIn;  

      PT_AIConfig ptAIConfig;

   //Step 1: Display hardware and software settings for running this example 

   printf( "Before running this example, please\n" ); 

   printf( "use the device installation utility to add the device.\n" ); 

   //Step 2: Input parameters 

   printf( "\nPlease input parameters:" ); 

   printf( "\nDevice Number (check the device installation utility ):"); 

   scanf( "%d", &lDevNum ); 

   printf( "Input Channel:" ); 

   scanf("%d", &usChan ); 

   //Step 3: Open device 

   dwErrCde = DRV_DeviceOpen( lDevNum,&lDriverHandle ); 

   if ( dwErrCde != SUCCESS ) 

   { 
        ErrorHandler( dwErrCde ); 

        printf("Program terminated!\n" ); 

        return ; 
   }   

   //Step 4: Configure input range 

   ptAIConfig.DasChan = usChan; // channel: 0 

   ptAIConfig.DasGain = 0;      // gain code: 0 

   dwErrCde = DRV_AIConfig( lDriverHandle, &ptAIConfig ); 

   if ( dwErrCde != SUCCESS ) 

   { 
       ErrorStop( &lDriverHandle, dwErrCde ); 

       return;
   } 

   // Step 5: Read one data 

   ptAIVoltageIn.chan = usChan; // input channel 

   ptAIVoltageIn.gain = 0;      // gain code: refer to 

   // manual for range 

   ptAIVoltageIn.TrigMode = 0;   // 0: internal trigger,1: external trigger 

   ptAIVoltageIn.voltage = &fVoltage; // Voltage retrieved 

   dwErrCde = DRV_AIVoltageIn( lDriverHandle, &ptAIVoltageIn ); 

   if ( dwErrCde != SUCCESS ) 

   { 
       ErrorStop( &lDriverHandle, dwErrCde ); 

       return; 
   }   
  
   // Step 6: Display reading data 

   printf( "Reading data =%10.6f\n", fVoltage ); 

   // Step 7: Close device 

   dwErrCde = DRV_DeviceClose( &lDriverHandle ); 

   if ( dwErrCde!=SUCCESS ) 

   { 
       ErrorStop(&lDriverHandle, dwErrCde ); 

       return; 
   } 

}     //main 

/********************************************************************** 

* Function: ErrorHandler 

* Show the error message for the corresponding error code 

* input: dwErrCde, IN, Error code 

* return: none 

**********************************************************************/ 

void ErrorHandler ( DWORD dwErrCde ) 

{ 
    char szErrMsg[ 180 ]; 

    DRV_GetErrorMessage( dwErrCde, szErrMsg ); 

    printf( "\n Error( %d ): %s\n", dwErrCde& 0xffff, szErrMsg ); 

}   //ErrorHandler   

/********************************************************************** 

* Function: ErrorStop 

* Release all resource and terminate program if error occurs 

* Paramaters: pDrvHandle, IN/OUT, pointer to Driver handle 

* dwErrCde, IN, Error code. 

* return: none 

*********************************************************************/ 

void ErrorStop( long *pDrvHandle, DWORD dwErrCde ) 

{ 
     //Error message 

     ErrorHandler( dwErrCde ); 

     printf( "Program terminated!\n" ); 

     //Close device 

     DRV_DeviceClose( pDrvHandle ); 

     exit( 0 ); 

}    //ErrorStop