fwrite error: try to write 26 bytes of file and the problems

I'm writing 26 Hex bytes data file using fwrite and I have unknown problems because of which has written 27 bytes

/////////////////////////////////// Code ///////////////////////////////////////////////////////////////////
FILE * READ;
READ = fopen ("DataReceived.dat", 'w'); opening the file for writing

unsigned char data2send [26] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
        
data2send [0] = 0xEB; conferment of the data
        
data2send [1] = 0 x 90; conferment of the data

data2send [10] = 0x08; / / data assignment
         
crcsent = calCRC16 (data2send, 24); calculation of 24 bytes CRC and the addition of crc (16 bit) to last two bytes of data
        
data2send [24] =(crcsent>>8) & 0xFF; Added to the second last octet CRC
        
data2send [25] = (crcsent & 0xFF);   CRC has added up to the last byte
       
If (ComWrt (coms, data2send, 26) == 26) / / send data to com port
{
             
fwrite (data2send, 1, 26, READ); ===> writing data in the file where there is problem
    
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////

Production (WRITTEN in the file) should be:

0xEB 0 X 90 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0 x 00 0x0A 0xA1

Output that I get the file (which is incorrect) and do not do because I've specified 26 bytes to write

0xEB 0 x 90 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x08 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0 x 00 0x0D 0x0A 0xA1

How 0x0D is added to my data, even though I'm only add data Byte 0,1,10,24,25

When I write 26 bytes then how 27 bytes are written to the file?

Thanks in advance

arfaoui

I can only imagine that the problem may arise from opening the file in text mode and write on it (0x0A) a line break character: the system can automatically add a CR (0x0D) in order to maintain the standard CRLF. Try opening the file in binary mode instead (fopen with "wb" specification).

Tags: NI Software

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