decode serial port datausing readfile()

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C#

dwBytesRead = 0;
int nread =32;

if (!ReadFile(hSerial, buffRead, nread, &dwBytesRead, NULL))
{
printf("error reading from input buffer \n");
}
printf("Data read from serial port is \n %s \n",buffRead);

if (buffRead=='$')
{
    printf("%s",buffRead);
}
else
{
    printf("data not found");
}

When I run the above function I was unable to decode data from the serial port. I would like to know if any function in windows 32 api can compare the string of data or replace the string of data into array for simplicity to decode the data.

Thanks

Posted 12-Nov-10 17:27pm

kevinang

Updated 12-Nov-10 20:05pm

v5

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Alain Rist 13-Nov-10 3:41am

How do you define and initialize buffRead?

2 solutions

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Richard MacCutchan · Answer 1 · 2010-11-12T23:42:00

if (buffRead=='$')

This statement is invalid, you cannot compare an array to the value of a single character and expect a proper result. Assuming that you are looking for a dollar sign as the first character of your array the statement should be:

if (*buffRead=='$')
// or
if (buffRead[0]=='$')

Spend some time rereading how to address the contents of different types of variables and arrays in C++.

kevinang · Answer 2 · 2010-11-13T01:32:00

Solution 2

Hi Richard Macutchan,
this is how i declare my variables for the reading of serial port.
i did try to use if (buffRead[0]=='$')inside my program. But i cant decode the data from it.

CSS

HANDLE hSerial;
COMMTIMEOUTS timeouts;
COMMCONFIG dcbSerialParams;
unsigned char buffRead[32];
DWORD dwBytesRead;

Posted 13-Nov-10 1:32am

kevinang

Comments

Richard MacCutchan 13-Nov-10 12:11pm

What do you mean when you say you can't decode the data? Nobody can guess what the data is supposed to represent or what format it comes in so you need to explain what data you receive and what you expect it to be.