Null String

thanks a lot for all
thanks very much
very goood!

thanks a lot for all
thanks so much
verygoood

Code:

---

void ProcessaBuffer (unsigned char *InBuf);
.....

unsigned char *InBuf;                                          // Buffer de Recebimento.
....

int RecebeSerial(void){

    int iLenBuf, iReadReturn;
               
        if(IsCom(iComBalanca)){
                iLenBuf = DataSizeInCom (iComBalanca);       
                iReadReturn = ReadComn(iComBalanca, &InBuf, iLenBuf);
               
                InBuf [iLenBuf] = '\0';
               
                if (iReadReturn >= 0){       
                        ProcessaBuffer (InBuf);
                }
               
                return 1;
        }
       
        return -1;
}

.....
int strrpos (unsigned char **pStrText, char pChar){        // Última ocorrência do caractere.
       
        int iLen, iCont;
        iLen = strlen (pStrText);

        printCom1 ("\nSTR.: %s", pStrText);
        printCom1 ("\nLEN.: %d", iLen);
       
        if (iLen > 0){
                for (iCont=iLen - 1; iCont>=0; iCont--){
                        if (pStrText[iCont] ==  pChar)
                                return iCont;
                }
                return 0;        // Não houve ocorrências
        }
        else { return 0; }        // String Nula
}

void ProcessaBuffer (unsigned char *pInBuf){

        char cChar;
        unsigned char *cPacote, *cPeso;
        unsigned char *cStatus;
        unsigned char cByte;
        int iCont;
        int iPosStart, iPosEnd, iPosTam;

        cChar = STARTCHAR;
        iPosStart = strrpos (pInBuf, cChar);
        printCom1 ("STARTCHAR: %c INT: %d Posição: %d\n", cChar, cChar, iPosStart);

---

send: 1234567890AB

rECEIVED:


STR.: `1<&#255;W&#226;&#249;H&#233;i_
LEN.: 14STARTCHAR:  INT: 2 Posi&#231;&#227;o: 0

So what does ReadComm look like?
As far as I can see, the inBuf is still pointing to the wrong memory.


--
Mats

I hate to be the one to point out the obvious, but wouldn't it be a good idea to crack open a good C programming book at this point?

Somebody can show me the correct syntax ?

Sorry, but some words I dont Understand.

Quote:

---

Originally Posted by sergioms

Somebody can show me the correct syntax ?

Sorry, but some words I dont Understand.

---

Without knowledge of what ReadComm actually does (or at least the correct prototype of it), we can't tell you what is the correct syntax for calling it, and I suspect that this is what all the problems stem from.

Edit: To clarify, it is not about syntax, it is about "what does it actually mean" - syntax the compiler will complain about, and as far as I understand, your code compiles and it's a question of it not doing precisely what you want that causes problems.

--
Mats

2.1.20 ReadComn

Description

This function reads ‘N’ bytes of data from the input buffer of the COM Port at one time.

For example:

"Num" is the total number of bytes in the input buffer of the COM Port.
If n < "Num", ‘N’=n. So n bytes of data are read from the input buffer of the COM Port at one time.
If n > "Num", ‘N’=Num. So "Num" bytes of data are read from the input buffer of the COM Port at one time.

Prototype

int ReadComn(int port, unsigned char *buf, int n);

Arguments

port 0-8 for COM0~COM8

buf The data buffer stores the data that is read from the input buffer of the COM Port

n The maximum number of bytes that can be read from the input buffer of the COM port (if n < "Num"). The n value must be less than or equal to the size of buf.

Return Value

Non-negative - The specified amount of data that has been read from the input buffer.
-1 (PortError) - port is not valid (0-8).

Okay. So the second argument is supposed to be an unsigned char *. However, &inBuf is not an unsigned char *, so that can't be the second argument. Presumably you just want inBuf instead (since inBuf is, indeed, a pointer to the data buffer).

And for this particular use, I'd say you are expecting too much from ReadComm - it does not allocate a buffer for you. You need to supply a buffer. As it stands, it doesn't appear that you are allocating a buffer. You can dynamically allocate with a call to malloc, or you could just declare inbuf as a array of N elements, and pass N as the argument 'n' in the ReadComm.

--
Mats