
Functions > di_list_length

Syntax

The di_list_length function sets input and output scan list lengths (number of channels). di_list_length must be called to acquire input channels.

Note: This function must be called before di_inlist.

Syntax

int di_list_length(in_length,out_length);
unsigned in_length;	/* sets input list length */
unsigned out_length;	/* sets output list length */

Parameters

in_length

Sets the input scan list length - the number of channels you will acquire data from.

out_length

Sets the output scan list length - the number of channels you will output data to.

Note: For devices that do not support output functions, out_length is reserved for compatibility (0).

Return Value

DI_NO_ERR	No error
DI_OPENED_ERR	Device not opened
DI_COMM_ERR	Communication error
DI_LENGTH_ERR	List Length error

Dependencies

di_open

Remarks

none

Sample Code

#include "200sdk.h"
int errcode;
char errstr[255];
main()
{
int i;
if(errcode = di_open()){	/* open the device for comm */
di_strerr(errcode,errstr);
printf("%s",errstr);
}
else
printf("Device installed successfully.....\n");
if(errcode = di_list_length(1,0)){	/* scan one input element (no outputs) */
di_strerr(errcode,errstr);
printf("%s",errstr);
}
else
printf("Length error.....\n");
di_close();
}