05-13-2014 11:35 PM
Hi,
How 0x0 can be wriiten to GPIB, i have a requiremnt tro write a series of 0x0's.
i may not be able to use this "ibwrt(cpi_handle,\x0\x0\x0\x0,4)" since the 0's are dynamic from a file.
since the ASCII equilent is NULL am not able to stor it in char array as well
please suggest a way to do this.
Thanks in advance
05-14-2014 12:39 AM
You could use an unsigned char array. The \0 characters aren't a problem if you don't use string functions ,which use \0 as termination character for handling that array.
The real problem is how to fill the array from your file. That depends on the exact format of your file. If it is binary you could use fgetc() to read the file and fill the the array characterwise.Often Scanfile() with the right format string ( have alook at the examples for the Scan functions in the CVI help) will work, too. But without more knowledge about the format of your data file we can't give more help.
05-16-2014 02:14 AM
Hi,
Let me be very simple with my question here,
i want to tansmit for continious zero in my GPIB so i asssigned the 0's as follows
chardata[0]=0;
chardata[1]=0;
chardata[2]=0;
chardata[3]=0;
chardata[4]=NULL;
ibwrt(cpi_handle.chardata,4);
once i assigned the zero like this its becoming NULL and i see no data in chardata array.
so am not able to send the continious zeros until i do "ibwrt(cpi_handle."\x0\x0\x0\x0",4)" which i canot so
please help me in this,am stuck with this issue
Thanks in advance
05-16-2014 03:08 AM
How do you view the array ? If you are using the debuggers "string display", you will see only the data up to the first zero if you don't enable Options->Display Entire Buffer and you will see nothing if you are using Format->ASCII( Use decimal or hexadecimal instead)
And you don't need to assign NULL as last character . Ibwrt() takes the number of characters to send as parameter and doesn't need a NULL ats Termination character.
Just try to run in interactuive execution window and put a breakpoint in front of the second statement
static unsigned char data2[5] = {0};
data2[0] = 0 ;
When viewing it with default options , it looks like in the attached first screenshot, with options changed it looks like in the second screenshot