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POmodem call in c++
 

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  1. POmodem call in c++
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    <p>I'm trying to make a modem call in one end, and in the other end the program answers the call. It doesn't seem to detect the carrier. Am I doing anything wrong? Am I missing something?</p> <pre><code>int main(int argc, char** argv) { ParseArgs(argc,argv); SerialPort* port = SerialPort::New(); if(!port) Error(ErrorNoMemory,"Can't create port"); int error = port-&gt;Open(PortNum, SendFlag); if(error) Error(error,"Can't open port"); error = port-&gt;Initialise(PortBaud); if(error) Error(error,"Can't initialise port"); if(ReceiveFlag) { port-&gt;Listen(); Receive(port); //after the call is stablished I send a file } else { port-&gt;Dial(PhoneNumber); Send(port); } port-&gt;Close(); delete port; return 0; } </code></pre> <p>The part of opening the port:</p> <pre><code>int Open(unsigned port, bool SendFlag) { // make name for port... char name[] = "\\\\.\\com???.???"; char* nameNumber = name+sizeof(name)-8; char* nameEnd = nameNumber; if(port&gt;999){ return ErrorInvalidPort; } if(port&gt;99) { *nameEnd++ = '0'+port/100; port %= 100; } if(port&gt;9) { *nameEnd++ = '0'+port/10; port %= 10; } *nameEnd++ = '0'+port; *nameEnd = 0; // open port... hSerial = CreateFile(name, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); if(hSerial==INVALID_HANDLE_VALUE) { switch(GetLastError()) { case ERROR_FILE_NOT_FOUND: return ErrorInvalidPort; case ERROR_ACCESS_DENIED: return ErrorPortInUse; default: return Error(); } } SetupComm( hSerial, 1024, 1024 ); if (!SendFlag) { if (!SetCommMask(hSerial, EV_RING |EV_RLSD)) // Error setting communications mask printf("error mascara"); } else { if (!SetCommMask(hSerial, EV_RLSD)) { // Error setting communications mask printf("error mascara"); } } return 0; } </code></pre> <p>The initialise part:</p> <pre><code>int Initialise(unsigned baud) { // flush port... if(!FlushFileBuffers(hSerial)) return Error(); if(!PurgeComm(hSerial, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR)) return Error(); // configure port... DCB dcb ; if(!GetCommState(hSerial, &amp;dcb)) return Error(); dcb.BaudRate = CBR_115200; dcb.ByteSize = 8; dcb.StopBits = ONESTOPBIT; dcb.Parity = NOPARITY; if(!SetCommState(hSerial, &amp;dcb)) { if(GetLastError()==ERROR_INVALID_PARAMETER) return ErrorInvalidSettings; return Error(); } // set timeouts to zero so read/writes return immediately... COMMTIMEOUTS timeouts = {0}; timeouts.ReadIntervalTimeout = MAXDWORD; timeouts.ReadTotalTimeoutConstant = 0; timeouts.ReadTotalTimeoutMultiplier = 0; timeouts.WriteTotalTimeoutConstant = 0; timeouts.WriteTotalTimeoutMultiplier= 0; if(!SetCommTimeouts(hSerial, &amp;timeouts)) return Error(); // flush port again... if(!PurgeComm(hSerial, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR)) return Error(); return 0; } </code></pre> <p>The dial part:</p> <pre><code>int Dial(char *telefono) { unsigned long int n = 0; DWORD dwCommEvent; DWORD bytes; DWORD dwRead; char cadena[15]; char chRead; sprintf(cadena, "ATDT%s\r", telefono); if (!WriteFile( hSerial, "ATH1\r", strlen("ATH1\r"), (&amp;(n)), 0 )) { printf("error"); } FlushFileBuffers( hSerial ); Sleep(1000); if (!WriteFile( hSerial, cadena, strlen(cadena), (&amp;(n)), 0)) { printf("error"); } FlushFileBuffers( hSerial ); Sleep(10000); printf("Marcamos"); do { printf("Espero eventos"); if(WaitCommEvent(hSerial, &amp;dwCommEvent, NULL)) { if(dwCommEvent &amp; EV_RLSD) { printf("rlsd"); break; } else { printf("otro"); } } printf("fin del bucle"); } while(true); return 0; } </code></pre> <p>The listening part:</p> <pre><code>int Listen() { DWORD dwCommEvent; unsigned long int n = 0; do { printf("ESpero eventos"); if(WaitCommEvent(hSerial, &amp;dwCommEvent, NULL)) { if(dwCommEvent &amp; EV_RING) { printf("RING"); if (!WriteFile( hSerial, "ATA\r", strlen("ATA\r"), (&amp;(n)), 0 )) { printf("error"); } FlushFileBuffers( hSerial ); break; } else if (dwCommEvent &amp; EV_RLSD ) { break; } } printf("fin del bucle"); } while(true); return 0; } </code></pre>
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