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mglsoft
Joined: 18 Feb 2008
Posts: 48
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| What is the number of parameters allowed to use sprintf ()? |
 Posted: Sat Dec 10, 2011 4:55 pm |
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What is the number of parameters allowed to use sprintf ()?
In my application I need to send 50 byte parameters in a string, but when I add more than 28 parameters the compiler gives the error:
Too many parameters
does not compile the program.
That may be the problem?
Is there any place where I can do this I need to change some parameters of the compiler?
Thank you for your help.
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MGLSOFT |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Sat Dec 10, 2011 8:24 pm |
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| I've run into that as well, I just split the print into 3 or 4 groups of parameters and it's worked fin for the past year or so. |
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mglsoft
Joined: 18 Feb 2008
Posts: 48
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| Posted: Sun Dec 11, 2011 11:25 am |
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Thanks for answering.
My problem is that shipping is a TCP / IP and I have that division made by group of parameters, and all should be able to send at least 44 different parameters, if I have to subdivide will be at least 16 messages instead of 8 ...
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MGLSOFT |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Sun Dec 11, 2011 11:46 am |
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Why not append them into a string then send the string all at once?
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Google and Forum Search are some of your best tools!!!! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Sun Dec 11, 2011 11:51 am |
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No.
Subdividing the printf, doesn't mean you have to increase the number of messages.
All you do is either send the separate printf operations to a buffer, and only initiate the transmission once the buffer is complete, or if using a printf to your own function, have a separate flag called something like 'end_of_message', and only set this once you have sent all the parameters you want.
Separate printf's don't mean separate messages.
Think about this for example:
| Code: |
printf(lcd_putc,"\f");
printf(lcd_putc,"First ");
printf(lcd_putc,"Second");
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Gives:
on the top left corner of the LCD, with the characters arriving as fast as the LCD can take them.
Best Wishes |
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temtronic
Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario
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| Posted: Sun Dec 11, 2011 11:59 am |
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Another example for you...
Here's how I store data on the Vinculum as a CSV formatted record.
| Code: | void usbfd_save_data(){
fprintf(usbfd,"WRF %C%C%C%C\r%C%C,%C%C,%C%C,%C%C,%C%C,%C%C,%C%C%C%C,%C%C%C%C,%C,%C%C%C\r",zro,zro,zro,0x21
,str_yer[0],str_yer[1]
,str_mth[0],str_mth[1]
,str_day[0],str_day[1]
,str_hrs[0],str_hrs[1]
,str_min[0],str_min[1]
,str_sec[0],str_sec[1]
,str_t1[0],str_t1[1],str_t1[2],str_t1[3]
,str_t2[0],str_t2[1],str_t2[2],str_t2[3]
,str_s1[0],str_s1[1]
,acr,alf
);
} |
It allows a PC with Excel to automatically import the data into a spreadsheet. |
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mglsoft
Joined: 18 Feb 2008
Posts: 48
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| Posted: Sun Dec 11, 2011 12:18 pm |
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I think I have understood what I want and need to do.
I'll paste the code so industry can better help:
| Code: | sprintf(str,"0101 : %02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U,%02U ",
SxM_1a8[0],SxM_1a8[1],SxM_1a8[2],SxM_1a8[3],SxM_1a8[4],SxM_1a8[5],SxM_1a8[6],SxM_1a8[7],
SxM_9a16[0],SxM_9a16[1],SxM_9a16[2],SxM_9a16[3],SxM_9a16[4],SxM_9a16[5],SxM_9a16[6],SxM_9a16[7],
SxM_17a24[0],SxM_17a24[1],SxM_17a24[2],SxM_17a24[3],SxM_17a24[4],SxM_17a24[5],SxM_17a24[6],SxM_17a24[7],
SxM_25a32[0],SxM_25a32[1],SxM_25a32[2],SxM_25a32[3]); /*,SxM_25a32[4],SxM_25a32[5],SxM_25a32[6],SxM_25a32[7],
SxM_33a40[0],SxM_33a40[1],SxM_33a40[2],SxM_33a40[3],SxM_33a40[4],SxM_33a40[5],SxM_33a40[6],SxM_33a40[7],
SxM_41a48[0],SxM_41a48[1],SxM_41a48[2],SxM_41a48[3]); ,%03U,%03U,%03U,%03U,%03U,%03U,%03U,%03U,%03U,
%03U,%03U,%03U,%03U,%03U,%03U,%03U,%03U*/
TCPPutArray(socket,str,strlen(str));
TCPFlush(socket); |
As you will see this discussed much of the parameters that need to send TCP / IP.
Not a printf (), but a sprintf ().
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MGLSOFT |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19499
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| Posted: Sun Dec 11, 2011 2:38 pm |
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Makes it even easier.
Sprintf, just puts the data into a string, starting at the address given. Just send a few values, then use strlen to find the length of the first part, and add the value returned to the address you use for the second call. Repeat until the whole string is built.
Very standard programming.
Best Wishes |
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mglsoft
Joined: 18 Feb 2008
Posts: 48
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| Posted: Mon Dec 12, 2011 8:09 pm |
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OK, I'll try as you say, then I will put the experience here.
Thank you.
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MGLSOFT |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Tue Dec 13, 2011 5:05 am |
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Design hint: instead of using strlen to determine the length of the string created by sprintf, you can use the return value of sprintf.
something like: | Code: | char buffer[500];
char *buf_pointer;
buf_pointer = &buffer[0];
buf_pointer += sprintf(buf_pointer, "my very long formatting string here");
buf_pointer += sprintf(buf_pointer, "my second formatting string here"); |
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mglsoft
Joined: 18 Feb 2008
Posts: 48
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| Posted: Thu Dec 15, 2011 7:05 pm |
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ckielstra:
Thank you very much for your idea of using pointers to implement and finish it works perfect!
I'll get what are the limits, to know and take them into account.
Thanks to other forum participants for your interest in helping me.
I'll be here to help in my humble knowledge that will allow me to do so.
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MGLSOFT |
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