Problem usind COM3 to send/recieve commands

I need help. I’m developing a easy project to test some commands, but, my program in C doesn’t change information with the arduino.

Here the codes

----–*-*ARDUINO CODE -–*-**-

const int LM35 = A0;
const int BUFFER_SIZE = 1000;
const float CELSIUS_BASE = 0.4887585532746823069403714565; //Base de conversão para Graus Celsius ((5/1023) * 100)
const float REFRESH_RATE = 2000;

char dataInput[20]; // Aloca espaço para a string
char charInput; // Para guardar o caractere lido

void setup() {
Serial.begin(9600);
pinMode(A0, INPUT);
}

void loop(){
if(Serial.available() > 0){ //Espera ter informação
delay(250);
for(int i=0;i<19;i++){ //Lê a informação do tamanho do espaço para a string
if(Serial.available() > 0){ //Só manipula a string se tiver informação
charInput = Serial.read(); //Lê um caractere
dataInput = charInput; //Armazena na string

  • dataInput[(i+1)] = ‘\0’; //Finaliza a string na próxima posição*

  • }*

  • }*

  • //Terminou de ler a string, agora processa*

  • if(!strcmp(dataInput,“temp”)){ //Se a informação requisitada for a temperatura*

  • //Envia a temperatura*

  • Serial.print("Temperatura: ");*

  • Serial.println(readTemperature());*

  • Serial.print("Temperatura com buffer: ");*

  • Serial.println(readTemperatureWithBuffer());*

  • }*

  • else{ //Quando o comando é inválido, se não for temp*

  • Serial.print("Comando inválido: ");*

  • Serial.println(dataInput);*

  • }*

  • }*

  • delay(REFRESH_RATE);*
    }
    float readTemperature(){
    return (analogRead(LM35) * CELSIUS_BASE);
    }
    float readTemperatureWithBuffer(){

  • float buffer = 0;*

  • for (int i = 0; i < BUFFER_SIZE; i++){*

  • buffer += analogRead(LM35);*

  • }*
    return ((buffer/BUFFER_SIZE) * CELSIUS_BASE);
    }[/quote]
    and the C Code
    > #include <windows.h>
    > #include <stdio.h>
    >
    > // Ler caractere
    > char SerialGetc(HANDLE *hCom)
    > {
    > char rxchar;
    > BOOL bReadRC;
    > static DWORD iBytesRead;
    >
    > bReadRC = ReadFile(*hCom, &rxchar, 1, &iBytesRead, NULL);
    > return rxchar;
    > }
    >
    > // Ler string
    > char* SerialGets(HANDLE *hCom)
    > {
    > static char rxstring[256];
    > char c;
    > int pos = 0;
    >
    > while(pos <= 255)
    > {
    > c = SerialGetc(hCom);
    > if (c==13) break;
    > if(c == ‘\r’) continue; // discard carriage return
    > rxstring[pos++] = c;
    > if(c == ‘\n’) break;
    >
    > }
    > rxstring[pos] = 0;
    > return rxstring;
    > }
    >
    > void SerialPuts(HANDLE *hCom, char *txstring)
    > {
    > BOOL bWriteRC;
    > static DWORD iBytesWritten;
    > bWriteRC = WriteFile(*hCom, txstring, strlen(txstring), &iBytesWritten,NULL);
    > }
    *> *
    >
    > int main(int argc, char *argv[])
    > {
    > char vetor[20];
    > DCB dcb;
    > HANDLE hCom;
    > BOOL fSuccess;
    > LPCSTR LpcCommPort = “COM3”;
    >
    > hCom = CreateFile( LpcCommPort,
    > GENERIC_READ || GENERIC_WRITE, // | GENERIC_WRITE,
    > 0, // must be opened with exclusive-access
    > NULL, // no security attributes
    > OPEN_EXISTING, // must use OPEN_EXISTING
    > 0, // not overlapped I/O
    > NULL // hTemplate must be NULL for comm devices
    > );
    >
    > if (hCom == INVALID_HANDLE_VALUE)
    > {
    > // Handle the error.
    > printf (“CreateFile failed with error %d.\n”, GetLastError());
    > return (1);
    > }
    >
    > // Build on the current configuration, and skip setting the size
    > // of the input and output buffers with SetupComm.
    >
    > fSuccess = GetCommState(hCom, &dcb);
    >
    > if (!fSuccess)
    > {
    > // Handle the error.
    > printf (“GetCommState failed with error %d.\n”, GetLastError());
    > return (2);
    > }
    >
    > // Fill in DCB: 57,600 bps, 8 data bits, no parity, and 1 stop bit.
    >
    > dcb.BaudRate = CBR_9600; // set the baud rate
    > dcb.ByteSize = 8; // data size, xmit, and rcv
    > dcb.Parity = NOPARITY; // no parity bit
    > dcb.StopBits = ONESTOPBIT; // one stop bit
    >
    > fSuccess = SetCommState(hCom, &dcb);
    >
    > if (!fSuccess)
    > {
    > // Handle the error.
    > printf (“SetCommState failed with error %d.\n”, GetLastError());
    > return (3);
    > }
    >
    > printf (“Serial port successfully reconfigured.\n”);
    *> *
    > //CÓDIGO PARA ENVIAR UMA REQUISIÇÃO E LER DO ARDUINO UMA VEZ
    > printf (“Requisitando temperatura…\n”);
    > SerialPuts(hCom,“temp”);
    > printf(“teste”);
    > Sleep(1000);
    > printf (“Resposta: %c”, SerialGets(hCom));
    > //FIM
    *> *
    > CloseHandle(hCom);
    > system(“PAUSE”);
    > return (0);
    > }

The C program crashes when i call the SerialPuts and the SerialGets functions.

Use code tag!

What machine? What operating system? C code has to run on a computer so what is it?